期刊
JOURNAL OF POWER SOURCES
卷 304, 期 -, 页码 196-206出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.11.008
关键词
Hydrogen evolution; Alkaline electrolysis; Nanocrystalline Fe alloys; Fe-Co; Intrinsic activity; Impedance spectroscopy
资金
- Federal Ministry of Economics and Energy BMWi of the Federal Republic of Germany [0327899A]
- European Union (ERDF)
- Free State of Saxony (ESF) [100087859 ENano]
In view of alkaline water electrolysis, the activities for the hydrogen evolution reaction of nanocrystalline Fe-based electrode materials were investigated and compared with the activities of polycrystalline Fe and Ni. Electrochemical methods were used to elucidate the overpotential value, the charge transfer resistance and the double layer capacity. Structural properties of the electrode surface were determined with SEM, XRD and XPS analyses. Thus, a correlation between electrochemical and structural parameters was found. In this context, we report on a cyclic voltammetric activation procedure which causes a significant increase of the surface area of Fe-based electrodes leading to a boost in effective activity of the activated electrodes. It was found that the intrinsic activity of activated Fe-based electrodes is very high due to the formation of a nanocrystalline surface layer. In contrast, the activation procedure influences only the intrinsic activity of the Ni electrodes without the formation of a porous surface layer. (C) 2015 Elsevier B.V. All rights reserved.
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