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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
Nature communications, 04/2022, Letnik: 13, Številka: 1Journal Article
Abstract The electrosynthesis of formate from CO 2 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 CO 2 . 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 CO 2 .
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in: SICRIS
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