Kim, Hoyoung Hwang, Eunkyoung Park, Hyanjoo Lee, Byung-Seok Jang, Jong Hyun Kim, Hyoung-Juhn Ahn, Sang Hyun Kim, Soo-Kil 2024-01-20T01:30:22Z 2024-01-20T01:30:22Z 2021-09-05 2017-06-05 0926-3373 https://pubs.kist.re.kr/handle/201004/122642 Electrodeposited CuxMO100-x catalysts were prepared on a Ti substrate for the hydrogen evolution reaction (HER) in acidic medium. By varying the electrolyte composition for electrodeposition, the atomic concentration of the CuxMO100-x electrocatalysts could be controlled, and the Mo content ranged between 0.8 and 6.9%. In the first cyclic voltammetry scan in a 0.5 M H2SO4 electrolyte, the recorded HER current densities of the CuxMo100-x, electrocatalysts at-0.50 V-RHE increased on increasing the Mo content to 3.8%; then, a further increase in Mo to 6.9% led to a saturation in the HER activity. The maximum value of the normalized current density with respect to the electrochemical surface area and the loading mass was found for the Cu99.2MOo.8 electrocatalyst. Characterization of the prepared catalysts revealed that the enhancement of catalytic activity originates from changes in the grain size and electronic structure. To operate a single cell of the proton exchange membrane water electrolyzer (PEMWE), we electrode posited CuMo catalyst on carbon paper, and this was used as the cathode, while IrO2 electrodeposited on carbon paper was used as the anode. The cell performance was normalized with respect to the metal mass loading and was found to be 3.4 A/mg(metal) at 1.9 V, a 2.2-10.8 times better catalyst cost-activity relationship compared to that of currently reported PEMWEs using Pt-based cathodes. Consequently, the results presented here show that non-noble metal cathodes can be used for PEMWE operation. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER OXYGEN EVOLUTION REACTION EFFICIENT ELECTROCATALYST ALLOY CATALYSTS WS2 NANOSHEETS MOLYBDENUM NI OXIDATION IRIDIUM NICKEL COPPER Non-precious metal electrocatalysts for hydrogen production in proton exchange membrane water electrolyzer Article 10.1016/j.apcatb.2017.01.074 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.206, pp.608 - 616 APPLIED CATALYSIS B-ENVIRONMENTAL 206 608 616 scie scopus 000395602000061 2-s2.0-85011691756 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article OXYGEN EVOLUTION REACTION EFFICIENT ELECTROCATALYST ALLOY CATALYSTS WS2 NANOSHEETS MOLYBDENUM NI OXIDATION IRIDIUM NICKEL COPPER Proton exchange membrane water electrolyzer Hydrogen evolution reaction CuxMO100-X catalyst Nanocrystalline catalyst Electrodeposition