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Weimin Zhang
School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China

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Journal article
Published: 18 April 2021 in Journal of Membrane Science
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Two-dimensional (2D) MXene membranes with high thermal and mechanical stability have shown great promise for water purification and desalination given their low energy consumption and high efficiency. In this work, we used a one-dimensional (1D) steady-state ion sieving and rejection model to describe the transport of hydrated cations through 2D lamellar MXene (Ti3C2Tx) membranes under transmembrane pressure field and external electric field. The model was validated using experimental data on the permeation fluxes of the 365 nm-thick MXene membrane with an interlayer spacing of 7.8 Å under transmembrane pressure of 0.2 atm at 298 K and under an external electric field between 0.1 and 8.25 V. The regressed model diffusion coefficients of penetrant (Di,pc) through the MXene membrane under transmembrane pressure field were 1.98 × 10−7 m2 h−1 for K+ and 1.77 × 10−7 m2 h−1 for Na+. Under the external electric field at 298 K and fixed starting solution concentration of 50 mg L−1 for K+ or Na+ cation, the diffusion coefficient of penetrant (Di,ec) from the regression were 2.55 × 10−9 m2 h−1 for K+ and 1.21 × 10−9 m2 h−1 for Na+. By applying the regressed parameters from both operation modes into the one-dimensional ion sieving and rejection models, the effects of interlayer spacing, potential voltage, temperature, and thickness on the permeation and rejection of hydrated K+ and Na+ cations through the MXene membrane can be effectively simulated. The use and modification of a theoretical model for ionic transport through 2D MXene (Ti2C3Tx) membranes we reported here can provide essential insights to guide future membrane design and determine its applicability of water desalination.

ACS Style

Yun Jin; Yiyi Fan; Xiuxia Meng; Jinyong Li; Claudia Li; Jaka Sunarso; Naitao Yang; Bo Meng; Weimin Zhang. Modeling of hydrated cations transport through 2D MXene (Ti3C2Tx) membranes for water purification. Journal of Membrane Science 2021, 631, 119346 .

AMA Style

Yun Jin, Yiyi Fan, Xiuxia Meng, Jinyong Li, Claudia Li, Jaka Sunarso, Naitao Yang, Bo Meng, Weimin Zhang. Modeling of hydrated cations transport through 2D MXene (Ti3C2Tx) membranes for water purification. Journal of Membrane Science. 2021; 631 ():119346.

Chicago/Turabian Style

Yun Jin; Yiyi Fan; Xiuxia Meng; Jinyong Li; Claudia Li; Jaka Sunarso; Naitao Yang; Bo Meng; Weimin Zhang. 2021. "Modeling of hydrated cations transport through 2D MXene (Ti3C2Tx) membranes for water purification." Journal of Membrane Science 631, no. : 119346.

Research article
Published: 06 April 2021 in ACS Applied Materials & Interfaces
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Constructing a rational electrode structure for supercapacitors is critical to accelerate the electrochemical kinetics process and thus promote the capacitance. Focusing on the flexible supercapacitor electrode, we synthesized a three-dimensional (3D) porous polypyrrole (PPy) film using a modified vapor phase polymerization method with the use of a porous template (CaCO3). The porous design provided the PPy film with an improved surface area and pore volume. The porous PPy film electrode was studied as a binder-free electrode for supercapacitors. It was found that the abundant interpenetrated pores created by the CaCO3 templates within the 3D framework are beneficial to overcoming the diffusion-controlled limit in the overall electrochemical process. It was revealed by electrochemical investigation that a more pseudocapacitive contribution than diffusion-controlled process contribution was observed in the total charge in the redox reaction. The galvanostatic charge/discharge (GCD) measurements showed that the optimized 3D porous PPy film electrode delivered a high capacitance of 313.6 F g–1 and an areal capacitance of 98.0 mF cm–2 at 1.0 A g–1 in a three-electrode configuration, which is nearly three times that of the dense counterpart electrode synthesized in the absence of the CaCO3 template. A specific capacitance of 62.5 F g–1 at 0.5 A g–1 and 31.1 F g–1 at 10 A g–1 was obtained in a symmetric capacitor device. In addition, the porous structure provided the PPy film with the attractive capability of accommodating the volume change during the doping/dedoping process. This is essential for the PPy film to maintain a long cycling life in a practical operation for a supercapacitor. It turned out that a high capacitance retention up to 81.3% after 10,000 GCD cycles was obtained for the symmetric supercapacitor device with the 3D porous PPy electrode (57.1% capacitive retention was observed for the dense PPy electrode). The strategy and the insight analysis are expected to provide valuable guidance for the design and the synthesis of flexible and wearable film electrodes with high performance.

ACS Style

Ting Wang; Yanan Wang; Di Zhang; Xiaomei Hu; Lipeng Zhang; Chen Zhao; Yu-Shi He; Weimin Zhang; Naitao Yang; Zi-Feng Ma. Structural Tuning of a Flexible and Porous Polypyrrole Film by a Template-Assisted Method for Enhanced Capacitance for Supercapacitor Applications. ACS Applied Materials & Interfaces 2021, 13, 17726 -17735.

AMA Style

Ting Wang, Yanan Wang, Di Zhang, Xiaomei Hu, Lipeng Zhang, Chen Zhao, Yu-Shi He, Weimin Zhang, Naitao Yang, Zi-Feng Ma. Structural Tuning of a Flexible and Porous Polypyrrole Film by a Template-Assisted Method for Enhanced Capacitance for Supercapacitor Applications. ACS Applied Materials & Interfaces. 2021; 13 (15):17726-17735.

Chicago/Turabian Style

Ting Wang; Yanan Wang; Di Zhang; Xiaomei Hu; Lipeng Zhang; Chen Zhao; Yu-Shi He; Weimin Zhang; Naitao Yang; Zi-Feng Ma. 2021. "Structural Tuning of a Flexible and Porous Polypyrrole Film by a Template-Assisted Method for Enhanced Capacitance for Supercapacitor Applications." ACS Applied Materials & Interfaces 13, no. 15: 17726-17735.

Research article
Published: 29 December 2020 in ACS Applied Materials & Interfaces
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Heterogeneous electrocatalytic reactions only occur at the interface between the electrocatalyst and reactant. Therefore, the active sites are only necessary to be distributed on the surface of the electrocatalyst. Based on this motivation, here, we demonstrate a systematic study on surface tuning for a carbon-based electrocatalyst from metal-free (with the heteroatoms N and S, NS/C) to metal-containing surfaces (with Co, N, and S, CoNS/C). The CoNS/C electrocatalyst was obtained by pyrolyzing the Co precoordinated and p-toluenesulfonate-doped polypyrrole (PPy). It was found that the coordination of Co on the PPy ring tuned the final carbon electrocatalyst into a catalyst with a CoNx moiety-rich surface. In addition, the as-synthesized CoNS/C was determined to have a very high loading of cobalt up to 2.02 wt %. The pyrolysis of the cobalt-containing precursor tends to proceed toward a characteristic of a higher sp2 carbon content, a higher surface area, and more nitrogen as well as active nitrogen sites than its metal-free counterpart. The most distinguished feature for such a catalyst is that the truly most active component is only distributed on the surface, in contrast with that of the conventional metal–N-based catalyst present throughout the bulky structure. Especially, the electrocatalytic activity toward oxygen evolution reaction (OER) has been investigated experimentally and theoretically. The results showed that the OER performance of the carbon-based electrocatalyst was remarkably boosted after the introduction of Co with an overpotential decrease from 678 to 345 mV at 10 mA cm–2. Furthermore, CoNS/C displayed an excellent durability upon a long-term measurement. The apparent activation energy measurements revealed that the metal-rich surface contributed to overcome the energy barrier for OER. In addition, density functional theory calculations have been conducted to explain the correlated OER mechanism. This study is expected to provide an effective strategy for the design and the synthesis of highly active metal–nitrogen-type electrocatalysts with a high metal loading for various electrocatalytic reactions.

ACS Style

Yanan Wang; Shuguang Zhang; Xiuxia Meng; Ting Wang; Yu Feng; Weimin Zhang; Yu-Shi He; Yucheng Huang; Naitao Yang; Zi-Feng Ma. Surface Tuning to Promote the Electrocatalysis for Oxygen Evolution Reaction: From Metal-Free to Cobalt-Based Carbon Electrocatalysts. ACS Applied Materials & Interfaces 2020, 13, 503 -513.

AMA Style

Yanan Wang, Shuguang Zhang, Xiuxia Meng, Ting Wang, Yu Feng, Weimin Zhang, Yu-Shi He, Yucheng Huang, Naitao Yang, Zi-Feng Ma. Surface Tuning to Promote the Electrocatalysis for Oxygen Evolution Reaction: From Metal-Free to Cobalt-Based Carbon Electrocatalysts. ACS Applied Materials & Interfaces. 2020; 13 (1):503-513.

Chicago/Turabian Style

Yanan Wang; Shuguang Zhang; Xiuxia Meng; Ting Wang; Yu Feng; Weimin Zhang; Yu-Shi He; Yucheng Huang; Naitao Yang; Zi-Feng Ma. 2020. "Surface Tuning to Promote the Electrocatalysis for Oxygen Evolution Reaction: From Metal-Free to Cobalt-Based Carbon Electrocatalysts." ACS Applied Materials & Interfaces 13, no. 1: 503-513.

Article
Published: 28 October 2019 in ChemElectroChem
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Nanoporous electrodes with high electrical conductivity and good mechanical properties are attractive for high‐performance flexible supercapacitors. In this work, we report a flexible polypyrrole (PPy) film electrode synthesized by a modified versatile vapor‐phase polymerization (VPP) strategy. Differing from conventional VPP protocols which are likely to form smooth polymer films, it could easily engineer the PPy film with porous and interconnected structure by simply optimizing the concentration of oxidant and the polymerization time. The film electrode showed an exceptionally high electrical conductivity up to 94 S cm ‐1 . The unique porous PPy films constructed by interconnected electronic/ionic conductive networks achieved a specific capacitance of 494 F g ‐1 (corresponding to 836 mF cm‐2) at a current density of 1 A g ‐1 . The fabricated all‐solid‐state supercapacitor device with the PPy electrodes exhibited a specific capacitance of 300 F g ‐1 at 1 A g ‐1 and a high energy density of 26.67 kW kg ‐1 . The high electrochemical performance and outstanding mechanical properties present the film electrode promising potential for flexible energy devices in various applications.

ACS Style

Jingwen Mao; Congcong Liu; Chi Cheng; Weimin Zhang; Xiao‐Zhen Liao; Jiulin Wang; Linsen Li; Xiaowei Yang; Yu‐Shi He; Zi‐Feng Ma. A Porous and Interconnected Polypyrrole Film with High Conductivity and Ion Accessibility as Electrode for Flexible All‐Solid‐State Supercapacitors. ChemElectroChem 2019, 6, 5479 -5485.

AMA Style

Jingwen Mao, Congcong Liu, Chi Cheng, Weimin Zhang, Xiao‐Zhen Liao, Jiulin Wang, Linsen Li, Xiaowei Yang, Yu‐Shi He, Zi‐Feng Ma. A Porous and Interconnected Polypyrrole Film with High Conductivity and Ion Accessibility as Electrode for Flexible All‐Solid‐State Supercapacitors. ChemElectroChem. 2019; 6 (21):5479-5485.

Chicago/Turabian Style

Jingwen Mao; Congcong Liu; Chi Cheng; Weimin Zhang; Xiao‐Zhen Liao; Jiulin Wang; Linsen Li; Xiaowei Yang; Yu‐Shi He; Zi‐Feng Ma. 2019. "A Porous and Interconnected Polypyrrole Film with High Conductivity and Ion Accessibility as Electrode for Flexible All‐Solid‐State Supercapacitors." ChemElectroChem 6, no. 21: 5479-5485.

Journal article
Published: 15 October 2019 in Processes
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Clarifying the mechanism for the gas transportation in the emerging 2D materials-based membranes plays an important role on the design and performance optimization. In this work, the corresponding studies were conducted experimentally and theoretically. To this end, we measured the gas permeances of hydrogen and nitrogen from their mixture through the supported MXene lamellar membrane. Knudsen diffusion and molecular sieving through straight and tortuous nanochannels were proposed to elucidate the gas transport mechanism. The average pore diameter of 5.05 Å in straight nanochannels was calculated by linear regression in the Knudsen diffusion model. The activation energy for H2 transport in molecular sieving model was calculated to be 20.54 kJ mol−1. From the model, we can predict that the gas permeance of hydrogen (with smaller kinetic diameter) is contributed from both Knudsen diffusion and molecular sieving mechanism, but the permeance of larger molecular gases like nitrogen is sourced from Knudsen diffusion. The effects of the critical conditions such as temperature, the diffusion pore diameter of structural defects, and the thickness of the prepared MXene lamellar membrane on hydrogen and nitrogen permeance were also investigated to understand the hydrogen permeation difference from Knudsen diffusion and molecular sieving. At room temperature, the total hydrogen permeance was contributed 18% by Knudsen diffusion and 82% by molecular sieving. The modeling results indicate that molecular sieving plays a dominant role in controlling gas selectivity.

ACS Style

Yun Jin; Yiyi Fan; Meng; Weimin Zhang; Naitao Yang; Shaomin Liu; Jin; Fan; Yang; Liu; Xiuxia Meng; Bo Meng. Theoretical and Experimental Insights into the Mechanism for Gas Separation through Nanochannels in 2D Laminar MXene Membranes. Processes 2019, 7, 751 .

AMA Style

Yun Jin, Yiyi Fan, Meng, Weimin Zhang, Naitao Yang, Shaomin Liu, Jin, Fan, Yang, Liu, Xiuxia Meng, Bo Meng. Theoretical and Experimental Insights into the Mechanism for Gas Separation through Nanochannels in 2D Laminar MXene Membranes. Processes. 2019; 7 (10):751.

Chicago/Turabian Style

Yun Jin; Yiyi Fan; Meng; Weimin Zhang; Naitao Yang; Shaomin Liu; Jin; Fan; Yang; Liu; Xiuxia Meng; Bo Meng. 2019. "Theoretical and Experimental Insights into the Mechanism for Gas Separation through Nanochannels in 2D Laminar MXene Membranes." Processes 7, no. 10: 751.

Review
Published: 02 October 2019 in Nanomaterials
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Recently, zinc-air batteries (ZABs) have been receiving attention due to their theoretically high energy density, excellent safety, and the abundance of zinc resources. Typically, the performance of the zinc air batteries is determined by two catalytic reactions on the cathode-the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). Therefore, intensive effort has been devoted to explore high performance electrocatalysts with desired morphology, size, and composition. Among them, single-atom catalysts (SACs) have emerged as attractive and unique systems because of their high electrocatalytic activity, good durability, and 100% active atom utilization. In this review, we mainly focus on the advance application of SACs in zinc air batteries in recent years. Firstly, SACs are briefly compared with catalysts in other scales (i.e., micro- and nano-materials). A main emphasis is then focused on synthesis and electrocatalytic activity as well as the underlying mechanisms for mono- and dual-metal-based SACs in zinc air batteries catalysis. Finally, a prospect is provided that is expected to guide the rational design and synthesis of SACs for zinc air batteries.

ACS Style

Weimin Zhang; Yuqing Liu; Lipeng Zhang; Jun Chen. Recent Advances in Isolated Single-Atom Catalysts for Zinc Air Batteries: A Focus Review. Nanomaterials 2019, 9, 1402 .

AMA Style

Weimin Zhang, Yuqing Liu, Lipeng Zhang, Jun Chen. Recent Advances in Isolated Single-Atom Catalysts for Zinc Air Batteries: A Focus Review. Nanomaterials. 2019; 9 (10):1402.

Chicago/Turabian Style

Weimin Zhang; Yuqing Liu; Lipeng Zhang; Jun Chen. 2019. "Recent Advances in Isolated Single-Atom Catalysts for Zinc Air Batteries: A Focus Review." Nanomaterials 9, no. 10: 1402.

Article
Published: 06 February 2018 in ChemNanoMat
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Metal phosphides (MPs) have emerged as a new class of high capacity and low cost anode for sodium-ion batteries (SIBs). In order to buffer the volume change during the sodiation process and improve the conductivity, we synthesized a porous composite which are FeP nanoparticles uniformly anchored on 3D reduced graphene oxide structure ([email protected]) by a low-temperature chemical solution deposition method with subsequent phosphorization and thermal reduction processes. The electrochemical characterization indicated that the [email protected] composite nanostructured anode delivers an attractive reversible capacity up to 366.6 mAh g-1 with superior cycling stability (388.8 mAh g-1 after 250 cycles) and high coulumbic efficiency (>99%), which is among the previously reported high performance transition MPs-based SIBs anode materials.

ACS Style

Yufeng Jiang; Weimin Zhang; Yang Yang; Yushi He; Jiulin Wang; Xiaowei Yang; Xiao-Zhen Liao; Zi-Feng Ma. Boosting the Sodiation Capability and Stability of FeP by In Situ Anchoring on the Graphene Conductive Framework. ChemNanoMat 2018, 4, 309 -315.

AMA Style

Yufeng Jiang, Weimin Zhang, Yang Yang, Yushi He, Jiulin Wang, Xiaowei Yang, Xiao-Zhen Liao, Zi-Feng Ma. Boosting the Sodiation Capability and Stability of FeP by In Situ Anchoring on the Graphene Conductive Framework. ChemNanoMat. 2018; 4 (3):309-315.

Chicago/Turabian Style

Yufeng Jiang; Weimin Zhang; Yang Yang; Yushi He; Jiulin Wang; Xiaowei Yang; Xiao-Zhen Liao; Zi-Feng Ma. 2018. "Boosting the Sodiation Capability and Stability of FeP by In Situ Anchoring on the Graphene Conductive Framework." ChemNanoMat 4, no. 3: 309-315.

Short communication
Published: 31 May 2017 in Electrochemistry Communications
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We demonstrate here a Fe, N, and S functionalized carbon (Fe/N/S-C) derived from an iron incorporated and p-toluenesulfonate doped polypyrrole precursor on a carbon support as an efficient catalyst for oxygen reduction reaction (ORR). Such a strategy could effectively suppress the formation of inferior activity metal species and less active oxidized type sulfur species. The as-synthesized Fe/N/S-C catalyst exhibited a highly catalytic activity for ORR which is comparable to the state-of-the-art commercial Pt/C catalyst at low overpotential range while have a better catalytic activity at the fuel cell operation potential range. In addition, this catalyst showed a higher durability and better tolerance to alcohol fuel than Pt/C catalyst.

ACS Style

Weimin Zhang; Yu-Shi He; Shiming Zhang; Xiaowei Yang; Xianxia Yuan; Zi-Feng Ma. Effectively incorporating iron, nitrogen, and sulfur functionalities on carbon surface for a superior electrocatalyst toward oxygen reduction reaction. Electrochemistry Communications 2017, 81, 34 -37.

AMA Style

Weimin Zhang, Yu-Shi He, Shiming Zhang, Xiaowei Yang, Xianxia Yuan, Zi-Feng Ma. Effectively incorporating iron, nitrogen, and sulfur functionalities on carbon surface for a superior electrocatalyst toward oxygen reduction reaction. Electrochemistry Communications. 2017; 81 ():34-37.

Chicago/Turabian Style

Weimin Zhang; Yu-Shi He; Shiming Zhang; Xiaowei Yang; Xianxia Yuan; Zi-Feng Ma. 2017. "Effectively incorporating iron, nitrogen, and sulfur functionalities on carbon surface for a superior electrocatalyst toward oxygen reduction reaction." Electrochemistry Communications 81, no. : 34-37.

Journal article
Published: 23 January 2017 in Electrochimica Acta
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In order to enhance cycling stability, Rb+ has been incorporated into Li-rich manganese based layered oxide cathode materials for lithium-ion batteries (LIBs) by a co-precipitation method and a subsequent solid-state reaction. The influence of the content of Rb+ in the cathodes on the performance was investigated and the optimal content was identified to be x = 0.03. The inter-slab distance exhibited a slight increase after the Rb+ incorporation, which reduced the energy barrier for the intercalation/deintercalation process of Li+ in the cathode. Electrochemical characterization showed that the as-synthesized cathode materials have an improved cycleability and rate performance compared with the pristine Li-rich manganese layered oxide based cathodes for LIBs. In addition, it was confirmed that the Rb+ doping clearly suppresses the process of the simultaneous lithium extraction along with oxygen activation at the high voltage region which could alleviate the irreversible loss of oxygen in the form of Li2O. The improved diffusion coefficient of Li ions in the Rb+ incorporated cathodes was confirmed by electrochemical impedance spectroscopy measurements.

ACS Style

Nan Li; Yu-Shi He; Xiaoping Wang; Weimin Zhang; Zi-Feng Ma; Dongyun Zhang. Incorporation of rubidium cations into Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 layered oxide cathodes for improved cycling stability. Electrochimica Acta 2017, 231, 363 -370.

AMA Style

Nan Li, Yu-Shi He, Xiaoping Wang, Weimin Zhang, Zi-Feng Ma, Dongyun Zhang. Incorporation of rubidium cations into Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 layered oxide cathodes for improved cycling stability. Electrochimica Acta. 2017; 231 ():363-370.

Chicago/Turabian Style

Nan Li; Yu-Shi He; Xiaoping Wang; Weimin Zhang; Zi-Feng Ma; Dongyun Zhang. 2017. "Incorporation of rubidium cations into Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 layered oxide cathodes for improved cycling stability." Electrochimica Acta 231, no. : 363-370.

Research article
Published: 19 December 2016 in ACS Applied Materials & Interfaces
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Flexible polypyrrole (PPy) films with highly ordered structures were fabricated by a novel vapor phase polymerization (VPP) process and used as the anode material in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). The PPy films demonstrate excellent rate performance and cycling stability. At a charge/discharge rate of 1 C, the reversible capacities of the PPy film anode reach 284.9 and 177.4 mAh g–1 in LIBs and SIBs, respectively. Even at a charge/discharge rate of 20 C, the reversible capacity of the PPy film anode retains 54.0% and 52.9% of the capacity of 1 C in LIBs and SIBs, respectively. After 1000 electrochemical cycles at a rate of 10 C, there is no obvious capacity fading. The molecular structure and electrochemical behaviors of Li- and Na-ion doping and dedoping in the PPy films are investigated by XPS and ex situ XRD. It is believed that the PPy film electrodes in the overoxidized state can be reversibly charged and discharged through the doping and dedoping of lithium or sodium ions. Because of the self-adaptation of the doped ions, the ordered pyrrolic chain structure can realize a fast charge/discharge process. This result may substantially contribute to the progress of research into flexible polymer electrodes in various types of batteries.

ACS Style

Tao Yuan; Jiafeng Ruan; Weimin Zhang; Zhuopeng Tan; Junhe Yang; Zi-Feng Ma; Shiyou Zheng. Flexible Overoxidized Polypyrrole Films with Orderly Structure as High-Performance Anodes for Li- and Na-Ion Batteries. ACS Applied Materials & Interfaces 2016, 8, 35114 -35122.

AMA Style

Tao Yuan, Jiafeng Ruan, Weimin Zhang, Zhuopeng Tan, Junhe Yang, Zi-Feng Ma, Shiyou Zheng. Flexible Overoxidized Polypyrrole Films with Orderly Structure as High-Performance Anodes for Li- and Na-Ion Batteries. ACS Applied Materials & Interfaces. 2016; 8 (51):35114-35122.

Chicago/Turabian Style

Tao Yuan; Jiafeng Ruan; Weimin Zhang; Zhuopeng Tan; Junhe Yang; Zi-Feng Ma; Shiyou Zheng. 2016. "Flexible Overoxidized Polypyrrole Films with Orderly Structure as High-Performance Anodes for Li- and Na-Ion Batteries." ACS Applied Materials & Interfaces 8, no. 51: 35114-35122.

Journal article
Published: 01 April 2016 in Electrochimica Acta
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ACS Style

Fei Pan; Weimin Zhang; Jingjing Ma; Ningna Yao; Li Xu; Yu-Shi He; Xiaowei Yang; Zi-Feng Ma. Integrating in situ solvothermal approach synthesized nanostructured tin anchored on graphene sheets into film anodes for sodium-ion batteries. Electrochimica Acta 2016, 196, 572 -578.

AMA Style

Fei Pan, Weimin Zhang, Jingjing Ma, Ningna Yao, Li Xu, Yu-Shi He, Xiaowei Yang, Zi-Feng Ma. Integrating in situ solvothermal approach synthesized nanostructured tin anchored on graphene sheets into film anodes for sodium-ion batteries. Electrochimica Acta. 2016; 196 ():572-578.

Chicago/Turabian Style

Fei Pan; Weimin Zhang; Jingjing Ma; Ningna Yao; Li Xu; Yu-Shi He; Xiaowei Yang; Zi-Feng Ma. 2016. "Integrating in situ solvothermal approach synthesized nanostructured tin anchored on graphene sheets into film anodes for sodium-ion batteries." Electrochimica Acta 196, no. : 572-578.

Journals
Published: 01 January 2016 in Nanoscale
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Hierarchically structured carbon coated SnO2 nanoparticles well-anchored on the surface of a CNT (C–SnO2/CNT) material were synthesized by a facile hydrothermal process and subsequent carbonization. The as-obtained C–SnO2/CNT hybrid, when applied as an anode material for lithium ion batteries (LIBs), showed a high reversible capacity up to 1572 mA h g−1 at 200 mA g−1 with a superior rate capability (685 mA h g−1 at 4000 mA g−1). Even after 100 charge/discharge cycles at 1000 mA g−1, a specific capacity of 1100 mA h g−1 can still be maintained. Such impressive electrochemical performance can be mainly attributed to the hierarchical sandwiched structure and strong synergistic effects of the ultrafine SnO2 nanoparticles and the carbon coating, and thus presents this material a promising anode material for LIBs.

ACS Style

Chunrong Ma; Weimin Zhang; Yu-Shi He; Qiang Gong; Haiying Che; Zi-Feng Ma. Carbon coated SnO2nanoparticles anchored on CNT as a superior anode material for lithium-ion batteries. Nanoscale 2016, 8, 4121 -4126.

AMA Style

Chunrong Ma, Weimin Zhang, Yu-Shi He, Qiang Gong, Haiying Che, Zi-Feng Ma. Carbon coated SnO2nanoparticles anchored on CNT as a superior anode material for lithium-ion batteries. Nanoscale. 2016; 8 (7):4121-4126.

Chicago/Turabian Style

Chunrong Ma; Weimin Zhang; Yu-Shi He; Qiang Gong; Haiying Che; Zi-Feng Ma. 2016. "Carbon coated SnO2nanoparticles anchored on CNT as a superior anode material for lithium-ion batteries." Nanoscale 8, no. 7: 4121-4126.

Journals
Published: 15 October 2015 in Chemical Communications
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A nitrogen-containing carbon film was derived from a vapor phase polymerized PPy precursor and developed as a fast charge/discharge capability anode for lithium-ion batteries.

ACS Style

Tao Yuan; Yushi He; Weimin Zhang; Zi-Feng Ma. A nitrogen-containing carbon film derived from vapor phase polymerized polypyrrole as a fast charging/discharging capability anode for lithium-ion batteries. Chemical Communications 2015, 52, 112 -115.

AMA Style

Tao Yuan, Yushi He, Weimin Zhang, Zi-Feng Ma. A nitrogen-containing carbon film derived from vapor phase polymerized polypyrrole as a fast charging/discharging capability anode for lithium-ion batteries. Chemical Communications. 2015; 52 (1):112-115.

Chicago/Turabian Style

Tao Yuan; Yushi He; Weimin Zhang; Zi-Feng Ma. 2015. "A nitrogen-containing carbon film derived from vapor phase polymerized polypyrrole as a fast charging/discharging capability anode for lithium-ion batteries." Chemical Communications 52, no. 1: 112-115.

Journal article
Published: 01 September 2015 in Electrochimica Acta
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ACS Style

Shu-Wen Kang; Hai-Ming Xie; Weimin Zhang; Jingping Zhang; Zi-Feng Ma; Rong-Shun Wang; Xing-Long Wu. Improve the Overall Performances of Lithium Ion Batteries by a Facile Method of Modifying the Surface of Cu Current Collector with Carbon. Electrochimica Acta 2015, 176, 604 -609.

AMA Style

Shu-Wen Kang, Hai-Ming Xie, Weimin Zhang, Jingping Zhang, Zi-Feng Ma, Rong-Shun Wang, Xing-Long Wu. Improve the Overall Performances of Lithium Ion Batteries by a Facile Method of Modifying the Surface of Cu Current Collector with Carbon. Electrochimica Acta. 2015; 176 ():604-609.

Chicago/Turabian Style

Shu-Wen Kang; Hai-Ming Xie; Weimin Zhang; Jingping Zhang; Zi-Feng Ma; Rong-Shun Wang; Xing-Long Wu. 2015. "Improve the Overall Performances of Lithium Ion Batteries by a Facile Method of Modifying the Surface of Cu Current Collector with Carbon." Electrochimica Acta 176, no. : 604-609.

Journal article
Published: 01 September 2015 in Nano Energy
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Solvothermal techniques were developed on the hydrothermal methods, and such methods especially in in situ fields have advantages in constructing functional three dimensional (3D) graphene-based composites in many aspects. To verify this concept, we presented in this article by comparing their application on the preparation of 3D Fe2O3/graphene sheets (Fe2O3/GS) composites, which are used as anode materials for lithium-ion batteries (LIB) and served as a probe here for exploring the merits from in situ solvothermal techniques. The ex situ solvothermal and in situ hydrothermal methods were adopted for comparison purpose. Physically, it was found that the in situ solvothermal process facilitates forming attractive interfacial interaction between GS and Fe2O3 resulting from the well wrapping and homogeneous distribution of nano-Fe2O3 particles into the 3D GS matrix and the forceful Fe–O–C bonds between nano-Fe2O3 and few-layer GS. We also confirmed electrochemically that the as-prepared 3D Fe2O3/graphene prepared by a in situ solvothermal technique showed better performance than those obtained via ex situ solvothermal and in situ hydrothermal methods. The in situ solvothermal strategy, if well engineered, can be extended to the synthesis of other high-performance 3D graphene-based materials for many other applications.

ACS Style

Jingjing Ma; Yu-Shi He; Weimin Zhang; Jiulin Wang; Xiaowei Yang; Xiao-Zhen Liao; Zi-Feng Ma. An experimental insight into the advantages of in situ solvothermal route to construct 3D graphene-based anode materials for lithium-ion batteries. Nano Energy 2015, 16, 235 -246.

AMA Style

Jingjing Ma, Yu-Shi He, Weimin Zhang, Jiulin Wang, Xiaowei Yang, Xiao-Zhen Liao, Zi-Feng Ma. An experimental insight into the advantages of in situ solvothermal route to construct 3D graphene-based anode materials for lithium-ion batteries. Nano Energy. 2015; 16 ():235-246.

Chicago/Turabian Style

Jingjing Ma; Yu-Shi He; Weimin Zhang; Jiulin Wang; Xiaowei Yang; Xiao-Zhen Liao; Zi-Feng Ma. 2015. "An experimental insight into the advantages of in situ solvothermal route to construct 3D graphene-based anode materials for lithium-ion batteries." Nano Energy 16, no. : 235-246.

Review article
Published: 23 July 2015 in Chinese Journal of Chemical Engineering
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This review focuses on the application of process engineering in electrochemical energy conversion and storage devices innovation. For polymer electrolyte based devices, it highlights that a strategic simple switch from proton exchange membranes (PEMs) to hydroxide exchange membranes (HEMs) may lead to a new-generation of affordable electrochemical energy devices including fuel cells, electrolyzers, and solar hydrogen generators. For lithium-ion batteries, a series of advancements in design and chemistry are required for electric vehicle and energy storage applications. Manufacturing process development and optimization of the LiFePO4/C cathode materials and several emerging novel anode materials are also discussed using the authors' work as examples. Design and manufacturing process of lithium-ion battery electrodes are introduced in detail, and modeling and optimization of large-scale lithium-ion batteries are also presented. Electrochemical energy materials and device innovations can be further prompted by better understanding of the fundamental transport phenomena involved in unit operations.

ACS Style

Yingying Xie; Weimin Zhang; Shuang Gu; Yushan Yan; Zi-Feng Ma. Process engineering in electrochemical energy devices innovation. Chinese Journal of Chemical Engineering 2015, 24, 39 -47.

AMA Style

Yingying Xie, Weimin Zhang, Shuang Gu, Yushan Yan, Zi-Feng Ma. Process engineering in electrochemical energy devices innovation. Chinese Journal of Chemical Engineering. 2015; 24 (1):39-47.

Chicago/Turabian Style

Yingying Xie; Weimin Zhang; Shuang Gu; Yushan Yan; Zi-Feng Ma. 2015. "Process engineering in electrochemical energy devices innovation." Chinese Journal of Chemical Engineering 24, no. 1: 39-47.

Journal article
Published: 13 April 2015 in 2D Materials
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Tao Yuan; Weimin Zhang; Wen-Ting Li; Chuantao Song; Yu-Shi He; Joselito M Razal; Zi-Feng Ma; Jun Chen. N-doped pierced graphene microparticles as a highly active electrocatalyst for Li-air batteries. 2D Materials 2015, 2, 24002 .

AMA Style

Tao Yuan, Weimin Zhang, Wen-Ting Li, Chuantao Song, Yu-Shi He, Joselito M Razal, Zi-Feng Ma, Jun Chen. N-doped pierced graphene microparticles as a highly active electrocatalyst for Li-air batteries. 2D Materials. 2015; 2 (2):24002.

Chicago/Turabian Style

Tao Yuan; Weimin Zhang; Wen-Ting Li; Chuantao Song; Yu-Shi He; Joselito M Razal; Zi-Feng Ma; Jun Chen. 2015. "N-doped pierced graphene microparticles as a highly active electrocatalyst for Li-air batteries." 2D Materials 2, no. 2: 24002.

Journal article
Published: 07 February 2015 in Journal of Power Sources
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The influence of Li precursors and calcination atmospheres on the reaction mechanisms, physical properties and electrochemical performance of graphene sheets (GS)-modified nano-Li4Ti5O12 (LTO/GS) has been systematically investigated. Field emission scanning electron microscopy (FE-SEM) and mass spectrometry (MS) results demonstrate the lithium precursor containing carboxyl anion such as lithium acetate (LiAc) and Li2CO3 interact with oxygen groups of graphene oxide (GO) by strong hydrogen bonds to restrict the morphology and the phase formation of products. We also notice from the thermogravimetry (TG) and MS results that the consumption of GS is proportional to oxygen content of lithium precursor. Cyclic voltammetry (CV) and X-ray photoelectric spectroscopy (XPS) results indicate that the product calcined in reducing atmosphere possess smaller electrochemical polarization due to more reduced Ti3+ on the surface of the product. The LTO/GS sample with LiOH as Li precursor calcined in diluted hydrogen atmosphere show the best electrochemical performance with a capacity of 134.4 mAh g−1 at 10C discharge rate and very stable cycling life with a 98.6% capacity retention after 800 cycles at 40C rate. This study not only provides an optimization of Li precursor and calcination condition for LTO/GS anode material, but also guides any future one-step syntheses of lithium composite materials with GO participation.

ACS Style

Wen-Ting Li; Tao Yuan; Weimin Zhang; Jingjing Ma; Chunming Zhang; Yu-Shi He; Xiao-Zhen Liao; Zi-Feng Ma. Influence of lithium precursors and calcination atmospheres on graphene sheets-modified nano-Li4Ti5O12 anode material. Journal of Power Sources 2015, 285, 51 -62.

AMA Style

Wen-Ting Li, Tao Yuan, Weimin Zhang, Jingjing Ma, Chunming Zhang, Yu-Shi He, Xiao-Zhen Liao, Zi-Feng Ma. Influence of lithium precursors and calcination atmospheres on graphene sheets-modified nano-Li4Ti5O12 anode material. Journal of Power Sources. 2015; 285 ():51-62.

Chicago/Turabian Style

Wen-Ting Li; Tao Yuan; Weimin Zhang; Jingjing Ma; Chunming Zhang; Yu-Shi He; Xiao-Zhen Liao; Zi-Feng Ma. 2015. "Influence of lithium precursors and calcination atmospheres on graphene sheets-modified nano-Li4Ti5O12 anode material." Journal of Power Sources 285, no. : 51-62.

Short communication
Published: 22 September 2014 in International Journal of Hydrogen Energy
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Cobalt-free composites Nd0.5Sr0.5Fe0.8Cu0.2O3−δ (NSFCu)–xSm0.2Ce0.8O1.9 (SDC) (x = 0–60 wt%) are investigated as IT-SOFC cathodes. The characteristic properties of cobalt-free composite cathodes comparing to cobalt-based composites are revealed. The DC conductivity and thermal expansion coefficient of the composite cathodes decrease with the content of SDC x, while the polarization resistance Rp shows the least value with addition of 40 wt% of SDC. The power density of the single cell with NSFCu-40% SDC composite cathode improved significantly compared with that of undoped NSFCu cathode, with peak values of 488, 623, 849 and 1052 mW cm−2 at 600, 650, 700, and 750 °C, respectively. Moreover, the performance of the composite cathode is stable within testing period of 370 h at 700 °C, indicating that the NSFCu-40% SDC is an excellent cobalt-free composite cathode applied in IT-SOFC.

ACS Style

Jie-Wei Yin; Yi-Mei Yin; Jun Lu; Chunming Zhang; Nguyen Q. Minh; Weiming Zhang; Zi-Feng Ma. Nd 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3−δ – x Sm 0.2 Ce 0.8 O 1.9 cobalt-free composite cathodes for intermediate temperature solid oxide fuel cells. International Journal of Hydrogen Energy 2014, 39, 17852 -17856.

AMA Style

Jie-Wei Yin, Yi-Mei Yin, Jun Lu, Chunming Zhang, Nguyen Q. Minh, Weiming Zhang, Zi-Feng Ma. Nd 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3−δ – x Sm 0.2 Ce 0.8 O 1.9 cobalt-free composite cathodes for intermediate temperature solid oxide fuel cells. International Journal of Hydrogen Energy. 2014; 39 (31):17852-17856.

Chicago/Turabian Style

Jie-Wei Yin; Yi-Mei Yin; Jun Lu; Chunming Zhang; Nguyen Q. Minh; Weiming Zhang; Zi-Feng Ma. 2014. "Nd 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3−δ – x Sm 0.2 Ce 0.8 O 1.9 cobalt-free composite cathodes for intermediate temperature solid oxide fuel cells." International Journal of Hydrogen Energy 39, no. 31: 17852-17856.

Journals
Published: 22 August 2014 in Journal of Materials Chemistry A
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A novel graphene sheet-wrapped cobalt hydroxide chloride composite is synthesized as a long-life anode material for lithium ion battery via a facile one-pot in situ hydrothermal route.

ACS Style

Jingjing Ma; Tao Yuan; Yu-Shi He; Jiulin Wang; Weimin Zhang; Dezhi Yang; Xiao-Zhen Liao; Zi-Feng Ma. A novel graphene sheet-wrapped Co2(OH)3Cl composite as a long-life anode material for lithium ion batteries. Journal of Materials Chemistry A 2014, 2, 16925 -16930.

AMA Style

Jingjing Ma, Tao Yuan, Yu-Shi He, Jiulin Wang, Weimin Zhang, Dezhi Yang, Xiao-Zhen Liao, Zi-Feng Ma. A novel graphene sheet-wrapped Co2(OH)3Cl composite as a long-life anode material for lithium ion batteries. Journal of Materials Chemistry A. 2014; 2 (40):16925-16930.

Chicago/Turabian Style

Jingjing Ma; Tao Yuan; Yu-Shi He; Jiulin Wang; Weimin Zhang; Dezhi Yang; Xiao-Zhen Liao; Zi-Feng Ma. 2014. "A novel graphene sheet-wrapped Co2(OH)3Cl composite as a long-life anode material for lithium ion batteries." Journal of Materials Chemistry A 2, no. 40: 16925-16930.