期刊
APPLIED SURFACE SCIENCE
卷 307, 期 -, 页码 146-152出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2014.03.197
关键词
Alkaline water splitting; Hydrogen evolution reaction; Alloy deposition; Nickel-Cobalt alloy catalyst
类别
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2012R1A1A1004731]
- KIST Institutional Program [2E24841]
- National Research Foundation of Korea [2012R1A1A1004731] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
As a catalyst for the hydrogen evolution reaction (HER) in alkaline water splitting, NiCo alloys of various compositions were prepared through electrodeposition onto Cu substrates. The composition of each alloy catalyst was varied by controlling the molar ratio of Co2+ ions in the electrolyte. With an increase in the Co content, the morphologies of the NiCo alloys were progressively changed from a round to polygonal shape. The NiCo alloys all exhibited a Ni rich surface, as confirmed by the bulk-to-surface compositional ratio and degree of alloying. The catalytic activities of the NiCo alloys toward the HER of water splitting were electrochemically tested in a KOH electrolyte, and the specific activities were characterized by considering the electrochemical surface areas of Ni and Co. The effect of alloying was demonstrated to be a significant enhancement of HER activity, resulting from a change in the electronic structures of Ni and Co. (c) 2014 Elsevier By. All rights reserved.
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