Electrochemical impedance spectra study of the hydrogen storage electrode

被引：30

作者：

Yang, HB ^{[1
]}

Zhang, YS ^{[1
]}

Zhou, ZX ^{[1
]}

Wei, JP ^{[1
]}

Wang, GS ^{[1
]}

Song, DY ^{[1
]}

Cao, XJ ^{[1
]}

Wang, CM ^{[1
]}

机构：

[1] NANKAI UNIV,DEPT CHEM,TIANJIN 300071,PEOPLES R CHINA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1995年 / 231卷 / 1-2期

关键词：

electrochemical impedance measurements; hydrogen storage electrodes;

D O I：

10.1016/0925-8388(95)01741-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The hydrogen storage electrode (MH) has been investigated by a.c. impedance measurements. The electrode impedance has been measured by superimposing an a.c. voltage of 5 mV amplitude ranging between 10(4) and 10(-2) Hz. The impedance experiment result indicated that Cole-Cole plot for the electrode consisted of two obviously comparable semicircles and a slope related to Warburg impedance, and the semicircle in the high frequency region was very different from that in the low frequency region. The very small semicircle in the high frequency region was probably a typical double-layer capacitance; the large semicircle in the low frequency region which exhibited marked dependence on the hydrogen content was attributed to the electrochemical Heyrovsky reaction. The two semicircles were both affected by the electrode activation numbers and the depth of discharge. The impedance experiment also indicated that the semicircle in the high frequency region was almost independent of activation number, but that in the low frequency region was not. On increasing the depth of discharge, the two semicircles both reduced at first and increased later.

引用

页码：625 / 630

页数：6

共 17 条

[1] BEHAVIOR OF OVERPOTENTIAL DEPOSITED SPECIES IN FARADAIC REACTIONS .2. AC IMPEDANCE MEASUREMENTS ON H-2 EVOLUTION KINETICS AT ACTIVATED AND UNACTIVATED PT CATHODES [J].