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- Title
Antimony oxides-protected ultrathin Ir-Sb nanowires as bifunctional hydrogen electrocatalysts.
- Authors
Xu, Bingyan; Huang, Xuan; Liu, Shangheng; Hu, Zhiwei; Kao, Cheng-Wei; Chan, Ting-Shan; Geng, Hongbo; Zhang, Ying; Huang, Xiaoqing
- Abstract
Developing electrocatalysts with fast kinetics and long-term stability for alkaline hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) is of considerable importance for the industrial production of green and sustainable energy. Here, an ultrathin Ir-Sb nanowires (Ir-Sb NWs) protected by antimony oxides (SbOx) was synthesized as an efficient bifunctional catalyst for both HOR and HER under alkaline media. Except from the much higher mass activities of Ir-Sb nanowires than those of Ir nanowires (Ir NWs) and commercial Pt/C, the SbOx protective layer also contributes to the maintenance of morphology and anti-CO poisoning ability, leading to the long-term cycling performance in the presence of CO. Specifically, the Ir-Sb NW/SbOx exhibits the highest catalytic activities, which are about 3.5 and 4.8 times to those of Ir NW/C and commercial Pt/C toward HOR, respectively. This work provides that the ultrathin morphology and H2O-occupied Sb sites can exert the intrinsic high activity of Ir and effectively optimize the absorption of OH⋆ both in alkaline HER/HOR electrolysis.
- Subjects
NANOWIRES; ANTIMONY; ELECTROCATALYSTS; HYDROGEN oxidation; SUSTAINABILITY; HYDROGEN evolution reactions; CATALYTIC activity
- Publication
Nano Research, 2024, Vol 17, Issue 3, p1042
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-023-5996-0