TY - JOUR
T1 - Refining the surface properties of WO2.7 by vacancy engineering and transition metals doping for enhanced alkaline hydrogen evolution reaction
AU - Huang, Huawei
AU - Xu, Liangliang
AU - Yoon Woo, Dong
AU - Kim, Seongbeen
AU - Min Kim, Sung
AU - Kyeong Kim, Yong
AU - Byeon, Jaeho
AU - Lee, Jinwoo
N1 - Generated from Scopus record by KAUST IRTS on 2023-09-21
PY - 2023/1/1
Y1 - 2023/1/1
N2 - Anion-exchange membrane water electrolyzer is a promising and green technology for hydrogen production. However, the high energy barriers for the water dissociation step for breaking the strong H[sbnd]O[sbnd]H covalent bond results in sluggish hydrogen evolution reaction (HER) kinetics at the cathode. Herein, we present a strategy to optimize the morphology and surface properties of WO2.7 by introducing oxygen vacancies and doping with various transition metals. The experimental analysis demonstrates that the developed Co-WO2.7-x and Ni-WO2.7-x with ultrafine nanorods structure provide a larger electrochemical surface area than the other synthesized catalysts. Furthermore, theoretical analysis reveals that Co-WO2.7-x has the lowest energy barrier (0.65 eV) for the water dissociation step, which is much lower than that of WO2.7 (2.61 eV). Consequently, the Co-WO2.7-x delivers a current of 10 mA cm−2 at a small overpotential of 59 mV for alkaline HER.
AB - Anion-exchange membrane water electrolyzer is a promising and green technology for hydrogen production. However, the high energy barriers for the water dissociation step for breaking the strong H[sbnd]O[sbnd]H covalent bond results in sluggish hydrogen evolution reaction (HER) kinetics at the cathode. Herein, we present a strategy to optimize the morphology and surface properties of WO2.7 by introducing oxygen vacancies and doping with various transition metals. The experimental analysis demonstrates that the developed Co-WO2.7-x and Ni-WO2.7-x with ultrafine nanorods structure provide a larger electrochemical surface area than the other synthesized catalysts. Furthermore, theoretical analysis reveals that Co-WO2.7-x has the lowest energy barrier (0.65 eV) for the water dissociation step, which is much lower than that of WO2.7 (2.61 eV). Consequently, the Co-WO2.7-x delivers a current of 10 mA cm−2 at a small overpotential of 59 mV for alkaline HER.
UR - https://linkinghub.elsevier.com/retrieve/pii/S1385894722044187
UR - http://www.scopus.com/inward/record.url?scp=85137291043&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.138939
DO - 10.1016/j.cej.2022.138939
M3 - Article
SN - 1385-8947
VL - 451
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -
