Xuefeng Wang

Prof. Dr. Xuefeng Wang

School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
orcid

Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 December 2013 in Journal of Materials Chemistry A
Verified
Journal Article
Closed access
PDF file
HWHuanwen Wang
Huanwen Wang
HYHuan Yi
Huan Yi
XCXiao Chen
Xiao Chen
Xuefeng WangXuefeng Wang
Xuefeng Wang
A pulsed laser deposition process using ozone as an oxidant is developed to grow NiO nanoparticles on highly conductive three-dimensional (3D) graphene foam (GF). The excellent electrical conductivity and interconnected pore structure of the hybrid NiO/GF electrode facilitate fast electron and ion transportation. The NiO/GF electrode displays a high specific capacitance (1225 F g−1 at 2 A g−1) and a superb rate capability (68% capacity retention at 100 A g−1). A novel asymmetric supercapacitor with high power and energy densities is successfully fabricated using NiO/GF as the positive electrode and hierarchical porous nitrogen-doped carbon nanotubes (HPNCNTs) as the negative electrode in aqueous KOH solution. Because of the high individual capacitive performance of NiO/GF and HPNCNTs, as well as the synergistic effect between the two electrodes, the asymmetric capacitor exhibits an excellent energy storage performance. At a voltage range from 0.0 to 1.4 V, an energy density of 32 W h kg−1 is achieved at a power density of 700 W kg−1. Even at a 2.8 s charge–discharge rate (42 kW kg−1), an energy density as high as 17 W h kg−1 is retained. Additionally, the NiO/GF//HPNCNT asymmetric supercapacitor exhibits excellent cycling durability, with 94% specific capacitance retained after 2000 cycles.


1 November 2013 in Journal of Materials Chemistry A
Verified
Journal Article
Closed access
PDF file
HWHuanwen Wang
Huanwen Wang
HYHuan Yi
Huan Yi
XCXiao Chen
Xiao Chen
Xuefeng WangXuefeng Wang
Xuefeng Wang
A facile one-step strategy has been developed to prepare 3D graphene/VO2 nanobelt composite hydrogels, which can be readily scaled-up for mass production by using commercial V2O5 and graphene oxide as precursors. During the formation of the graphene/VO2 architecture, 1D VO2 nanobelts and 2D flexible graphene sheets are self-assembled to form interconnected porous microstructures through hydrogen bonding, which facilitates charge and ion transport in the electrode. Due to the hierarchical network framework and the pseudocapacitance contribution from VO2 nanobelts, the hybrid electrode demonstrates excellent capacitive performances. In the two-electrode configuration, the graphene/VO2 nanobelt composite hydrogel exhibits a specific capacitance of 426 F g−1 at 1 A g−1 in the potential range of −0.6 to 0.6 V, which greatly surpasses that of each individual counterpart (191 F g−1 and 243 F g−1 at 1 A g−1 for VO2 nanobelt and graphene hydrogel, respectively). The hybrid electrode also shows an improved rate capability and cycling stability, which is indicative of a positive synergistic effect of VO2 and graphene on the improvement of electrochemical performance. These findings reveal the importance and great potential of graphene composite hydrogels in the development of energy storage devices with high power and energy densities.

8 July 2014 in ACS Sustainable Chemistry & Engineering
Verified
Journal Article
Closed access
BQBin Qiu
Bin Qiu
CXCuixia Xu
Cuixia Xu
DSDezhi Sun
Dezhi Sun
HYHuan Yi
Huan Yi
JGJiang Guo
Jiang Guo
SWSuying Wei
Suying Wei

15 April 2014 in The Journal of Physical Chemistry C
Verified
Journal Article
Closed access
XCXiao Chen
Xiao Chen
HWHuanwen Wang
Huanwen Wang
HYHuan Yi
Huan Yi
Xuefeng WangXuefeng Wang
Xuefeng Wang
XYXingru Yan
Xingru Yan
ZGZhanhu Guo
Zhanhu Guo

17 August 2015 in Journal of Materials Chemistry A
Verified
Journal Article
Closed access
PDF file
HYHuan Yi
Huan Yi
HWHuanwen Wang
Huanwen Wang
YJYuting Jing
Yuting Jing
TPTianquan Peng
Tianquan Peng
YWYiran Wang
Yiran Wang
Xuefeng WangXuefeng Wang
Xuefeng Wang
Asymmetric supercapacitors with CNT@nickel hydroxide nanosheet composites and 3-D graphene networks demonstrated a high energy density (∼44.0 W h kg −1 ) and high power density (∼16 kW kg −1 ) in aqueous KOH electrolyte.