期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 23, 页码 11880-11886出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp2036982
关键词
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资金
- Korea Research Institute of Chemical Technology (KRICT)
- Korean government [2009-0064640, 2009-0084771]
- BK 21 program of Korea
- National Research Foundation of Korea [2009-0084771, 2009-0064640, 과C6A1906] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Herein, a pseudocapacitive charging behavior of highly conductive ordered mesoporous tungsten oxide (m-WO(3-x)) methods such as cyclic voltammetry (CV), galvanostatic charge-discharge experiment and electrochemical impedance spectroscopy (EIS) were employed. From CV experiment, a relationship analysis between voltammetric charge and scan rate resulted in total (67 C g(-1)), outer (61 C g(-1)) and inner charge (6 C g(-1)), which was related with the well-developed crystalline structure of m-WO(3-x). In galvanostatic charge discharge profiles with change of applied current, a more severe decrease of cathodic capacity than the anodic one was observed, which was attributed to larger cathodic resistance. This resistance dependency on potential was clarified with EIS fitting analysis. Here, the charge transfer resistance and Warburg diffusion resistance became larger with increasing potential, which was relevant to the change of oxidation state during redox reaction. Using these electrochemical analysis results, a schematic illustration of the pseudocapacitive charging mechanism was proposed.
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