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Through interface engineering and content control strategy, a PdBi bimetallic interface structure was constructed for the first time to selectively convert CO2 to formate with a remarkably high Faraday efficiency (FEformate) of 94% and a partial current density (jformate) of 34 mA·cm−2 at −0.8 V vs. reversible hydrogen electrode (RHE) in an H-cell. Moreover, the PdBi interface electrocatalyst even exhibited a high current density of 180 mA·cm−2 with formate selectivity up to 92% in a flow cell and could steadily operate for at least 20 h. Electrochemical in-situ attenuated total reflection surface enhanced infrared absorption spectroscopy (ATR-SEIRAS) confirmed that the PdBi interface could greatly weaken the adsorption of *CO intermediates due to electronic and geometric effects. Density functional theory (DFT) calculations also established that the PdBi interface regulated the CO2-to-formate pathway by reducing the energy barrier toward HCOOH and largely weakening the adsorption of *CO intermediates on the catalyst surface. This study reveals that the unique PdBi bimetallic interface can provide a novel platform to study the reaction mechanism through combining in-situ ATR-SEIRAS and DFT calculations.

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Publication history
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Acknowledgements

Publication history

Received: 20 April 2023
Revised: 08 May 2023
Accepted: 10 May 2023
Published: 13 June 2023
Issue date: August 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 22003074 and 22002087), Youth Innovation Promotion Association CAS, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials (No. 2021MCIMKF03), and Baoshan Iron & Steel Co., Ltd. (Baosteel), located in Shanghai, China.

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