Effect of Polarization on the O-2(g), Au/YSZ Electrode System

	Effect of Polarization on the O-2(g), Au/YSZ Electrode System
	Wang Guangwei; Li Heping; Xu Yuanjian; Xu Liping; Zhang Lei
	2013
Source Publication	International Journal of Electrochemical Science
Volume	8 Issue:5 Pages:6579-6590
Abstract	The oxygen electrode reaction at the interface gold/yttria stabilized zirconia (YSZ) was investigated at moderate temperatures of 500 and 600 degrees C under ambient air condition, with emphasis put on the comparative analysis for effect of anodic and cathodic polarization on the electrode. Generally, at the temperature of 500 degrees C, slow monotonous alterations of the absolute currents or potentials result from polarizations were observed, but the response curves exihibited obvious fluctuations at 600 degrees C, which may be ascribed to the progressive transportation processes of the electro-active species in the electrode system. Due to the relatively weak adsorption ability of Au electrode interfaced with YSZ, the oxygen atoms induced by anodic polarization left toward the ambient air rapidly, which consequently led to the improved activity for oxidation reactions. However, while the electrode was under cathodic bias, the oxygen reduced mainly originated from the ambient air, and had to reach the reaction sites located at the two or three boundary interfaces through series of successive processes such as disassociation, adsorption and diffusion, which result in the low transporting efficiency of the active agencies beyond all doubt and consequently decreased activity for reduction reactions at the electrode system. The remarkable enhancement of electrode catalytic activity was only observed from the potentiostatic polarization experiments at 600 degrees C and with anodic polarization, perhaps due to the short polarization times and relatively low experiment temperatures.
Subject Area	地球深部物质与流体作用地球化学
Language	英语
Document Type	期刊论文
Identifier	http://ir.gyig.ac.cn/handle/352002/5071
Collection	地球内部物质高温高压实验室_地球内部物质高温高压实验室_期刊论文地球深部物质与流体作用地球化学研究室
Recommended Citation GB/T 7714	Wang Guangwei,Li Heping,Xu Yuanjian,et al. Effect of Polarization on the O-2(g), Au/YSZ Electrode System[J]. International Journal of Electrochemical Science,2013,8(5):6579-6590.
APA	Wang Guangwei,Li Heping,Xu Yuanjian,Xu Liping,&Zhang Lei.(2013).Effect of Polarization on the O-2(g), Au/YSZ Electrode System.International Journal of Electrochemical Science,8(5),6579-6590.
MLA	Wang Guangwei,et al."Effect of Polarization on the O-2(g), Au/YSZ Electrode System".International Journal of Electrochemical Science 8.5(2013):6579-6590.

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