Volume 21, Issue 12 2411191
Research Article

Turn the Harm into A Benefit: Axial Cl Adsorption on Curved Fe-N4 Single Sites for Boosted Oxygen Reduction Reaction in Seawater

Lei Wang

Lei Wang

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032 P. R. China

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Mengting Huang

Mengting Huang

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032 P. R. China

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Jinyan Zhang

Jinyan Zhang

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032 P. R. China

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Yun Han

Yun Han

School of Engineering and Built Environment, Queensland Micro- and Nanotechnology Centre, Griffith University, Nathan Campus, Queensland, 4111 Australia

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Xuan Liu

Xuan Liu

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032 P. R. China

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Ying Chen

Ying Chen

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032 P. R. China

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Helong Wu

Helong Wu

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032 P. R. China

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Xiaodong Qian

Xiaodong Qian

Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, China Academy of Safety Science and Technology, Beijing, 100012 China

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Aijun Du

Aijun Du

School of Chemistry and Physics and Centre for Materials Science Queensland University of Technology, Gardens Point Campus, Brisbane, 4001 Australia

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Xin Wang

Corresponding Author

Xin Wang

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032 P. R. China

E-mail: [email protected]

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First published: 26 February 2025

Abstract

Seawater electrocatalysis is urgently needed for various energy storage and conversion systems. However, the adsorption of chloride ions (Cl) to the active sites can degrade the oxygen reduction reaction (ORR) activity and stability, thus reducing the catalytic performance. In this paper, a curved FeN4 single atomic structure is designed by utilizing curvature engineering, which can turns the harmful Cl adsorption into a benefit on the Fe single site that changes the rate determining step of ORR and reduces the overall energy barrier according to density functional theory (DFT) calculation. Experimental studies reveal the prepared highly-curved single-atom iron catalyst (HC-FeSA) exhibits excellent ORR activity in different electrolytes, with half-wave potentials of 0.90 V in 0.1 M KOH, 0.90 V in simulated seawater, and 0.75 V in natural seawater, respectively. This work opens up an avenue for the synthesis of high-performance seawater-based single-atom ORR catalysts through regulating the local atomic curvature.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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