期刊
CHEMSUSCHEM
卷 13, 期 12, 页码 3199-3211出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202000503
关键词
electrochemistry; oxygen evolution reaction; oxygen reduction reaction; surface chemistry; thin films
资金
- Deutsche Forschungsgemeinschaft (DFG) [BE 1201/22-1, 422053626]
- German Federal Ministry of Education and Research in the project LiEcoSafe [03X4636C]
The performance of structurally and chemically well-defined Ni-free and Ni-modified single-crystalline Co3O4(1 1 1) thin-film electrodes in the oxygen reduction and evolution reactions (ORR and OER) was investigated in a combined surface science and electrochemistry approach. Pure and Ni-modified Co3O4(1 1 1) film electrodes were prepared and characterized under ultrahigh-vacuum conditions by scanning tunneling microscopy and X-ray photoelectron spectroscopy. Both Ni decoration (by post-deposition of Ni) and Ni doping (by simultaneous vapor deposition of Ni, Co, and O-2) induced distinct differences in the base cyclic voltammograms in 0.5 m KOH at potentials higher than 0.7 V compared with Co3O4(1 1 1) electrodes. Also, all oxide film electrodes showed a higher overpotential for the ORR but a lower one for the OER than polycrystalline Pt. Ni modification significantly improved the ORR current densities by increasing the electrical conductivity, whereas the OER onset of approximately 1.47 V-RHE (RHE: reversible hydrogen electrode) at 0.1 mA cm(-2) was almost unchanged.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据