Some problems on the resistance method in the in situ measurement of hydrogen content in palladium electrode

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	Some problems on the resistance method in the in situ measurement of hydrogen content in palladium electrode
	Zhang, WS ; Zhang, ZF ; Zhang, ZL
刊名	JOURNAL OF ELECTROANALYTICAL CHEMISTRY
	2002-06-14
卷号	528 期号:1-2 页码:1-17
关键词	Pd Electrode Resistance Concentration-cell Hydrogen Evolution Diffusion
ISSN号	0022-0728
英文摘要	Some problems on the resistance method in determining the hydrogen content in PdHx electrodes are discussed. First, the resistivity ratio of PdHx, the temperature coefficient of resistivity and the resistance of PdHx, and the resistance of Pd having undergone hydriding-dehydriding cycles are discussed. It is found that the resistivity ratio is somewhat higher than the resistance ratio with the :same x value and their difference depends on the internal stress-state arising from hydrogen insertion. Another fact that has been emitted in past work is that the temperature coefficients of PdHx resistance and resistivity increase while x > 0.7. The Pd resistance decreases with hydriding-dehydriding cycle number due to the shape deformation of the electrode, which occurs. Second, the effect of the non-uniform distribution of x in the electrode on determining the hydrogen content is discussed theoretically. It is proved that errors are particularly significant when the Pd + H system is in the mixed alpha + beta phase or the resistance is near the maximum value. Finally, we calculate the additional potential drop and hence the apparent resistance of the PdHx electrode caused by the co-conduction of electrolyte, the concentration-cell effect, the collection of electrolysis current and other imperfect configurations of the electrode in the in situ measurement of electrode resistance, using a direct current. It is found that an electrode with a large ratio of length to radius, an active surface, a surrounding electrolyte with high conductance and a high electrolysis current will all induce substantial additional resistance. At the same time, some advice on measuring the PdHx resistance is presented. (C) 2002 Published by Elsevier Science B.V.
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000177325000001
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/78785]
专题	中国科学院化学研究所
通讯作者	Zhang, WS
作者单位	1.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Ctr Mol Sci, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Zhang, WS,Zhang, ZF,Zhang, ZL. Some problems on the resistance method in the in situ measurement of hydrogen content in palladium electrode[J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY,2002,528(1-2):1-17.
APA	Zhang, WS,Zhang, ZF,&Zhang, ZL.(2002).Some problems on the resistance method in the in situ measurement of hydrogen content in palladium electrode.JOURNAL OF ELECTROANALYTICAL CHEMISTRY,528(1-2),1-17.
MLA	Zhang, WS,et al."Some problems on the resistance method in the in situ measurement of hydrogen content in palladium electrode".JOURNAL OF ELECTROANALYTICAL CHEMISTRY 528.1-2(2002):1-17.