期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 168, 期 10, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac2acc
关键词
Electrocatalysis; screening; bipolar electrode; array; electrochemiluminescence; imaging
资金
- National Science Foundation [CHE-1904426, ECC-1542101, NNCI-1542101, 1337840, 0335765]
- University of Washington
- Molecular Engineering & Sciences Institute
- National Institutes of Health
- Washington Research Foundation
- M. J. Murdock Charitable Trust
- Altatech
- ClassOne Technology
- GCE Market
- SPTS
- Clean Energy Institute
In this study, a novel electroanalytical platform utilizing bipolar ultramicroelectrode arrays and electrochemiluminescence imaging was developed for rapid screening of electrocatalysts. By electrodeposition of a radial gradient of catalytic metal on carbon-gold bipolar UME arrays, the impact of varying Ni(OH)2 coverage on the catalytic activity for the hydrogen evolution reaction (HER) was investigated. Future work will focus on expanding this platform to screen various metal alloys by incorporating multiple metal salts delivery during the gradient electrodeposition process.
Herein, we report the use of a massive array of bipolar ultramicroelectrodes (UMEs) in conjunction with electrochemiluminescence (ECL) imaging as a novel electroanalytical platform for rapid screening of electrocatalysts. Following our recent work on carbon bipolar UME arrays, we have developed asymmetric carbon-gold bipolar UME arrays where each carbon UME is coated by a thin gold film on one side. To generate large quantities of compositionally varied electrocatalyst samples, a radial gradient of catalytic metal is electrodeposited on the surface of these UME arrays by delivering a plume of metal salt solution to the array surface with a micropipette while the entire array is biased at a reducing potential. We then utilize these bipolar UME arrays to investigate the impact of varied Ni(OH)(2) coverage on the catalytic activity for hydrogen evolution reaction (HER) of an Au surface in alkaline solution, with the catalytic performance of the modified Au being confirmed to exhibit a peak-shaped dependence on increasing Ni(OH)(2) coverage. Our future work will expand this unique platform to enable the screening of various metal alloys by incorporating additional micropipettes for delivering multiple metal salts to the array during the gradient electrodeposition process.
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