Hong, Sung Hoon Ahn, Sang Hyun Choi, Jihui Kim, Jin Yeong Kim, Ho Young Kim, Hyoung-Juhn Jang, Jong Hyun Kim, Haekyoung Kim, Soo-Kil 2024-01-20T06:04:15Z 2024-01-20T06:04:15Z 2022-01-25 2015-09 0169-4332 https://pubs.kist.re.kr/handle/201004/125037 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. English ELSEVIER High-activity electrodeposited NiW catalysts for hydrogen evolution in alkaline water electrolysis Article 10.1016/j.apsusc.2015.05.040 1 APPLIED SURFACE SCIENCE, v.349, pp.629 - 635 APPLIED SURFACE SCIENCE 349 629 635 N scie scopus 000357129100084 2-s2.0-84937723895 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article NICKEL ALLOYS ELECTROCATALYSTS TUNGSTEN FABRICATION BEHAVIOR ENERGY LAYER FILMS Alkaline water electrolysis Hydrogen evolution reaction Alloy deposition Amorphous nickel tungsten alloy catalyst