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ACS Nano. 2012 Nov 27;6(11):10296-302. doi: 10.1021/nn304178b. Epub 2012 Oct 16.

LiCl/PVA gel electrolyte stabilizes vanadium oxide nanowire electrodes for pseudocapacitors.

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Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States.


Here we report a new strategy to improve the electrochemical stability of vanadium oxide electrodes for pseudocapacitors. 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 5000 cycles, without sacrificing the electrochemical performance of vanadium oxides.

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