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- Title
Exploring dopant effects in stannic oxide nanoparticles for CO<sub>2</sub> electro-reduction to formate.
- Authors
Ko, Young-Jin; Kim, Jun-Yong; Lee, Woong Hee; Kim, Min Gyu; Seong, Tae-Yeon; Park, Jongkil; Jeong, YeonJoo; Min, Byoung Koun; Lee, Wook-Seong; Lee, Dong Ki; Oh, Hyung-Suk
- Abstract
The electrosynthesis of formate from CO2 can mitigate environmental issues while providing an economically valuable product. Although stannic oxide is a good catalytic material for formate production, a metallic phase is formed under high reduction overpotentials, reducing its activity. Here, using a fluorine-doped tin oxide catalyst, a high Faradaic efficiency for formate (95% at 100 mA cm−2) and a maximum partial current density of 330 mA cm−2 (at 400 mA cm−2) is achieved for the electroreduction of CO2. Furthermore, the formate selectivity (≈90%) is nearly constant over 7 days of operation at a current density of 100 mA cm−2. In-situ/operando spectroscopies reveal that the fluorine dopant plays a critical role in maintaining the high oxidation state of Sn, leading to enhanced durability at high current densities. First-principle calculation also suggests that the fluorine-doped tin oxide surface could provide a thermodynamically stable environment to form HCOO* intermediate than tin oxide surface. These findings suggest a simple and efficient approach for designing active and durable electrocatalysts for the electrosynthesis of formate from CO2. Though stannic oxides can catalyze CO2 electroreduction to formate, the stability of these catalysts has been limited. Here, the authors demonstrate stable fluorine-doped SnO2 materials toward formate production at current densities of >300 mA/cm2.
- Subjects
STANNIC oxide; TIN oxides; CATALYSTS; DOPING agents (Chemistry); ELECTROLYTIC reduction; OXIDATION states; ELECTROSYNTHESIS
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-29783-7