Synergistic Effect of Grain Boundaries and Oxygen Vacancies on Enhanced Selectivity for Electrocatalytic CO2 Reduction
- Authors
- Wei, Xiaoqian; Li, Zijian; Jang, Haeseong; Wang, Zhe; Zhao, Xuhao; Chen, Yunfei; Wang, Xuefeng; Kim, Min Gyu; Liu, Xien; Qin, Qing
- Issue Date
- Jun-2024
- Publisher
- John Wiley and Sons Inc
- Keywords
- carbon dioxide reduction reaction; electrocatalyst; grain boundaries; oxygen vacancies; selectivity
- Citation
- Small, v.20, no.24
- Journal Title
- Small
- Volume
- 20
- Number
- 24
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69534
- DOI
- 10.1002/smll.202311136
- ISSN
- 1613-6810
1613-6829
- Abstract
- Dual-engineering involved of grain boundaries (GBs) and oxygen vacancies (VO) efficiently engineers the material's catalytic performance by simultaneously introducing favorable electronic and chemical properties. Herein, a novel SnO2 nanoplate is reported with simultaneous oxygen vacancies and abundant grain boundaries (V,G-SnOx/C) for promoting the highly selective conversion of CO2 to value-added formic acid. Attributing to the synergistic effect of employed dual-engineering, the V,G-SnOx/C displays highly catalytic selectivity with a maximum Faradaic efficiency (FE) of 87% for HCOOH production at −1.2 V versus RHE and FEs > 95% for all C1 products (CO and HCOOH) within all applied potential range, outperforming current state-of-the-art electrodes and the amorphous SnOx/C. Theoretical calculations combined with advanced characterizations revealed that GB induces the formation of electron-enriched Sn site, which strengthens the adsorption of *HCOO intermediate. While GBs and VO synergistically lower the reaction energy barrier, thus dramatically enhancing the intrinsic activity and selectivity toward HCOOH. © 2023 Wiley-VCH GmbH.
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