Toward feasible single atom-based hydrogen evolution electrocatalysts via artificial ensemble sites for anion exchange membrane water electrolyzeropen access
- Authors
- Lim, Won-Gwang; Truong, Hoang Nam; Jeong, Jae-Yeop; Kim, Dongkyu; Oh, Lee Seul; Jo, Changshin; Kim, Chiho; Kim, Hyung Ju; Choi, Sung Mook; Shin, Hyeyoung; Lee, Seonggyu; Lim, Eunho
- Issue Date
- Apr-2024
- Publisher
- ELSEVIER
- Keywords
- Alkaline hydrogen evolution reaction; Artificial ensemble site; Single atom electrocatalyst; Water dissociation; Anion exchange membrane water electrolyzer
- Citation
- APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY, v.343
- Journal Title
- APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
- Volume
- 343
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/26448
- DOI
- 10.1016/j.apcatb.2023.123568
- ISSN
- 0926-3373
1873-3883
- Abstract
- Approaching an efficient anion exchange membrane water electrolyzer (AEMWE) with satisfactorily high ki-netics in the alkaline hydrogen evolution reaction (HER) is desired. We design an advanced platinum (Pt) single atom (SA)-based electrocatalyst by incorporating the Ni nanoparticle as an artificial ensemble site adjacent to Pt SA. The designed Pt SA electrocatalyst achieves higher areal current density (500 mA cm-2 at 1.8 V) in the single cell of the AEMWE and better cell voltage stability than the Pt/C electrocatalyst. The Ni nanoparticle assists in separating the binding sites of H* and OH*, in which Ni atoms provide adsorption sites for H*, while OH* adsorbs on the Pt SA. This separation effect drastically accelerates the energy barrier required for the water dissociation reaction in the Volmer step and simultaneously optimizes the H* and OH* binding energy, which extremely enhances the alkaline HER kinetics, thereby demonstrating the feasibility of Pt SA electrocatalysts for AEMWE.
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