Fabrication and evaluation of nickel cobalt alloy electrocatalysts for alkaline water splitting

Title
Fabrication and evaluation of nickel cobalt alloy electrocatalysts for alkaline water splitting
Authors
Sung Hoon Hong안상현최인수표성규김형준장종현김수길
Keywords
Alkaline water splitting; Hydrogen evolution reaction; Alloy deposition; Nickel-Cobalt alloy catalyst
Issue Date
2014-07
Publisher
Applied surface science
Citation
VOL 307, 146-152
Abstract
tAs a catalyst for the hydrogen evolution reaction (HER) in alkaline water splitting, NiCo alloys of variouscompositions were prepared through electrodeposition onto Cu substrates. The composition of each alloycatalyst was varied by controlling the molar ratio of Co2+ ions in the electrolyte. With an increase in theCo content, the morphologies of the NiCo alloys were progressively changed from a round to polygonalshape. The NiCo alloys all exhibited a Ni rich surface, as confirmed by the bulk-to-surface compositionalratio and degree of alloying. The catalytic activities of the NiCo alloys toward the HER of water splittingwere electrochemically tested in a KOH electrolyte, and the specific activities were characterized byconsidering the electrochemical surface areas of Ni and Co. The effect of alloying was demonstrated tobe a significant enhancement of HER activity, resulting from a change in the electronic structures of Niand Co.
URI
http://pubs.kist.re.kr/handle/201004/47685
ISSN
01694332
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KIST Publication > Article
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