Exploring dopant effects in stannic oxide nanoparticles for CO2 electro-reduction to formate

Young Jin Ko, Jun Yong Kim, Woong Hee Lee, Min Gyu Kim, Tae Yeon Seong, Jongkil Park, Yeon Joo Jeong, Byoung Koun Min, Wook Seong Lee, Dong Ki Lee, Hyung Suk Oh

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Article number2205
JournalNature communications
Issue number1
Publication statusPublished - 2022 Dec

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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