2020年6月
Thein situmorphology transformation of bismuth-based catalysts for the effective electroreduction of carbon dioxide
Sustainable Energy and Fuels
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- 巻
- 4
- 号
- 6
- 開始ページ
- 2831
- 終了ページ
- 2840
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1039/d0se00228c
© The Royal Society of Chemistry 2020. Bismuth (Bi)-based catalysts have been widely used for the electroreduction of carbon dioxide (CO2). In this work, a Bi-based catalyst was electrodeposited on a Cu foam substrate and applied to the selective electrochemical reduction of CO2to formic acid (HCOOH). Anin situmorphological transformation phenomenon accompanied by the formation of petal-shaped bismuth subcarbonate (Bi2O2CO3) nanosheets was observed, and this resulted in enhanced electrocatalytic performance. By using this catalyst, the faradaic efficiency of the CO2to HCOOH process reached 92% at −1.6 V (vs.Ag/AgCl, −1.0 Vvs.RHE) with a total current density of 10 mA cm−2. Also, this electrocatalyst exhibited good stability during electrocatalysis for 20 h. Density functional theory calculations revealed thatin situ-formed Bi2O2CO3species enhanced the catalytic activity by stabilizing the *OOCH intermediate through the stronger orbital hybridization of Bi 6p of Bi2O2CO3with O 2p of *OOCH. As such, it can be considered that the rate-limiting step in the CO2electroreduction process should be the second electron transfer step, which is consistent with the Tafel slope analysis results.
- リンク情報
- ID情報
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- DOI : 10.1039/d0se00228c
- eISSN : 2398-4902
- SCOPUS ID : 85085963892