High-activity electrodeposited NiW catalysts for hydrogen evolution in alkaline water electrolysis

Title
High-activity electrodeposited NiW catalysts for hydrogen evolution in alkaline water electrolysis
Author(s)
김혜경홍성훈[홍성훈]안상현[안상현]최지후[최지후]김진영[김진영]김형준[김형준]김호영[김호영]장종현[장종현]김수길[김수길]
Keywords
NIPX ALLOYS; W ALLOYS; NICKEL; ELECTROCATALYSTS; TUNGSTEN; FILMS; FABRICATION; SURFACES; CATHODES; BEHAVIOR
Issue Date
201509
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED SURFACE SCIENCE, v.349, pp.629 - 635
Abstract
NiW alloy catalysts were prepared on a Cu foil substrate by using a co-electrodeposition method for use in the hydrogen evolution (HER) in alkaline water electrolysis. The compositions of the alloy catalysts were controlled over a wide range by varying the molar ratio [W6+]/[Ni2+] in the electrolyte. At high W contents (similar to 41 at.%) in the deposited catalyst, the morphologies of the NiW alloys showed drastic changes compared with those of electrodeposited Ni, in particular a significant decrease in surface coverage and aggregates' sizes. All of NiW alloys deposited in a citrate-containing bath demonstrated an amorphous structure, regardless of W content. Electrochemical measurements employing repeated cyclic voltammetry (CV) showed enhanced HER activities for the NiW alloy catalysts compared with the pure Ni catalyst. The maximum HER activity was obtained with a W content of 41 at.%; the alloying effects, including morphological changes, and the high affinity for hydrogen absorption shown by this alloy's amorphous structure are dominant factors in the enhanced HER activity. The results presented herein provide advanced information of significant relationship between material properties and HER activity of NiW alloys. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/30985http://dx.doi.org/10.1016/j.apsusc.2015.05.040
ISSN
0169-4332
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공과대학 > 신소재공학부 > Articles
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