Facile CO2 Electro-Reduction to Formate via Oxygen Bidentate Intermediate Stabilized by High-Index Planes of Bi Dendrite Catalyst

Jai Hyun Koh, Da Hye Won, Taedaehyeong Eom, Nak Kyoon Kim, Kwang Deog Jung, Hyungjun Kim, Yun Jeong Hwang, Byoung Koun Min

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

Electrochemical CO2 conversion to chemical products is a promising strategy for sustainable industrial development. However, the success of this approach requires an in-depth understanding of catalysis because it involves highly complex multistep reactions. Herein, we suggest a rational design of a hierarchical Bi dendrite catalyst for an efficient conversion of CO2 to formate. A high selectivity (∼89% at -0.74 VRHE) and, more importantly, a stable performance during long-term operation (∼12 h) were achieved with the Bi dendrite. Density functional theory (DFT) is used to investigate three possible reaction pathways in terms of surface intermediate, and the one via∗OCOH surface intermediate is calculated to be the most energetically feasible. DFT calculations further elucidate the plane-dependent catalytic activity and conclude that the high-index planes developed on the Bi dendrite are responsible for the sustainable performance of Bi dendrite. We expect that our experimental and theoretical study will provide a fundamental guideline for the CO2-to-formate conversion pathway as well as design principles for enhancing the catalytic performance.

Original languageEnglish
Pages (from-to)5071-5077
Number of pages7
JournalACS Catalysis
Volume7
Issue number8
DOIs
Publication statusPublished - 2017 Aug 4

Keywords

  • bismuth
  • CO reduction
  • dendrite
  • electrocatalyst
  • formate

ASJC Scopus subject areas

  • Catalysis

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    Koh, J. H., Won, D. H., Eom, T., Kim, N. K., Jung, K. D., Kim, H., Hwang, Y. J., & Min, B. K. (2017). Facile CO2 Electro-Reduction to Formate via Oxygen Bidentate Intermediate Stabilized by High-Index Planes of Bi Dendrite Catalyst. ACS Catalysis, 7(8), 5071-5077. https://doi.org/10.1021/acscatal.7b00707