Journal
ACS NANO
Volume 6, Issue 11, Pages 10296-10302Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn304178b
Keywords
vanadium oxides; LiCl/PVA gel electrolyte; nanowires; electrochemical stability; pseudocapacitors
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Funding
- NSF (United States) [DMR-0847786]
- Natural Science Foundations of China [90923008, J1103305]
- Natural Science Foundations of Guangdong Province [9251027501000002]
- Academic New Artist Ministry of Education Doctoral Post Graduate (China)
- China Scholarship Council
- Direct For Mathematical & Physical Scien [0847786] Funding Source: National Science Foundation
- Division Of Materials Research [0847786] Funding Source: National Science Foundation
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Here we report a new strategy to improve the electrochemical stability of vanadium oxide electrodes for pseudo-capacitors. Vanadium oxides are known to suffer from severe capacitance loss during charging/discharging cycling, due to chemical dissolution and ion intercalation/deintercalation-induced material pulverization. We demonstrate that these two issues can be addressed by using a neutral pH LiCl/PVA gel electrolyte. The function of the gel electrolyte is twofold: (i) it reduces the chemical dissolution of amphoteric vanadium oxides by minimizing water content and providing a neutral pH medium and (ii) it serves as a matrix to maintain the vanadium oxide nanowire network structure. Vanadium oxide nanowire pseudocapacitors with gel electrolyte exhibit excellent capacitance retention rates of more than 85% after cycling for sop cycles, without. sacrificing the electrochemical performance of vanadium oxides.
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