Ultrafine PtCo nanoparticles decorated Co nanowires on Ti mesh deliver an ultrahigh current density of 46.5 mA cm −2 at an overpotential of 70 mV in 1.0 M KOH.
26 September 2020 in Energy & Environmental Materials
In this work, the hierarchical CoNiO2@CeO2 nanosheet composites were successfully prepared by a one‐step hydrothermal process with a subsequent annealing process for the first time. The CeO2 nanoparticles successfully deposit on the surface of CoNiO2 nanosheet, and benefit the improvement of electrical contact between CoNiO2 and CeO2. CeO2 modification improve the reversibility of insertion/extraction of Li‐ions and electrochemical reaction activity, and promotes the transport of Li‐ions. Benefited of the unique architecture and component, the CoNiO2@CeO2 nanosheet composites show high‐reversible capacities, excellent cycling stability and good rate capability. The CoNiO2@CeO2 (5.0 wt%) shows a charge/discharge capacity of 867.1/843.2 mAh g−1 after 600 cycles at 1 A g−1, but the pristine CoNiO2@CeO2 nanosheet only delivers a charge/discharge capacity of 516.9/517.6 mAh g−1 after 500 cycles. The first‐principles calculation reveals that valid interfaces between CeO2 and NiCoO2 can be formed, and the formation process of the interfaces is exothermic. The strong interfacial interaction resulting in an excellent structure stability and thus a cycling stability of the CoNiO2@CeO2 material. This work provides an effective strategy to develop high‐performance anode materials for advanced a lithium‐ion battery, and the CoNiO2@CeO2 nanosheet shows a sizeable potential as an anode material for next generation of high‐energy Li‐ion batteries.
Pyroptosis, an immunogenic programmed cell death, could efficiently activate tumor immunogenicity and reprogram immunosuppressive microenvironment for boosting cancer immunotherapy. However, the overexpression of SLC7A11 promotes glutathione biosynthesis for maintaining redox balance and countering pyroptosis. Herein, we develop intermetallics modified with glucose oxidase (GOx) and soybean phospholipid (SP) as pyroptosis promoters (Pd2Sn@GOx-SP), that not only induce pyroptosis by cascade biocatalysis for remodeling tumor microenvironment and facilitating tumor cell immunogenicity, but also trigger disulfidptosis mediated by cystine accumulation to further promote tumor pyroptosis in female mice. Experiments and density functional theory calculations show that Pd2Sn nanorods with an intermediate size exhibit stronger photothermal and enzyme catalytic activity compared with the other three morphologies investigated. The peroxidase-mimic and oxidase-mimic activities of Pd2Sn cause potent reactive oxygen species (ROS) storms for triggering pyroptosis, which could be self-reinforced by photothermal effect, hydrogen peroxide supply accompanied by glycometabolism, and oxygen production from catalase-mimic activity of Pd2Sn. Moreover, the increase of NADP+/NADPH ratio induced by glucose starvation could pose excessive cystine accumulation and inhibit glutathione synthesis, which could cause disulfidptosis and further augment ROS-mediated pyroptosis, respectively. This two-pronged treatment strategy could represent an alternative therapeutic approach to expand anti-tumor immunotherapy.
This article summarizes the regulation strategies of Fe-based MOFs-derived electrocatalysts for ZABs, and provides a prospect for their future development.