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Influence of Surface Roughness of YSZ on Polarization of Pt Electrode Deposited on the Electrolyte
Wang, Guangwei1,2; Li, Heping1; Xu, Yuanjian2; Xu, Liping1; Zhang, Lei1,3
2013-07-01
摘要The influence of surface roughness of YSZ on polarization of Pt electrode deposited on the electrolyte was investigated in ambient air at 600 degrees C, with emphasis put on the comparative analysis for the anodic and cathodic polarization of Pt electrode prepared by using different grade of diamond pastes. Generally, at the absolute over-potentials up to 0.3V, the limiting currents passing through the electrode during anodic polarization were lower than that under cathodic bias result from the depressed site-exchange reaction of oxygen and platinum atoms. However, while the electrode was polarized at the absolute over-potentials larger than 0.3V, the more pronounced electro-activity for oxidation was found ascribed to the promotion of site-exchange reaction. Although a relatively smaller quantity of oxygen anions oxidized at the limited interfaces of the electrode prepared by using 1000 grade diamond paste than that of the electrode prepared by using 400 grade paste, the site-exchange reaction might be actuated by the concentrated contact area in the former electrode, which made it exhibits the maxmum electro-catalytic activity at the over-potentials lower than 0.4V. As the polarization signal increased, the second electrode won and held the best performance due to the saturation of site-exchange reaction. The further chronopotentiometric experiments demonstrated that the electrode was more active towards oxidation than towards reduction reactions under strong polarization. And the remarkable enhancement of electro-catalytic activity was not observed during both potentiostatic and amperostatic polarization experiments might be due to the short polarization time and relatively low temperature.
关键词surface roughness Pt/YSZ electrode polarization chronoamperometry chronopotentiometry
发表期刊INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
ISSN1452-3981
卷号8期号:7页码:9093-9106
通讯作者Wang, GW (reprint author), Chinese Acad Sci, Inst Geochem, Lab High Temp & High Pressure Study Earths Interi, Guiyang 550002, Peoples R China.
收录类别SCI
WOS记录号WOS:000323547600015
语种英语