1. Surface curvature effect on single-atom sites for the oxygen reduction reaction: A model of mesoporous MOF-derived carbon.
- Author
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Li, Jingjing, Xia, Wei, Guo, Yanna, Qi, Ruijuan, Xu, Xingtao, Jiang, Dong, Wang, Tao, Sugahara, Yoshiyuki, He, Jianping, and Yamauchi, Yusuke
- Subjects
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CATALYTIC activity , *CURVED surfaces , *ENERGY storage , *CURVATURE , *REDUCTION potential - Abstract
• Enhance FeN 4 active sites using tunable curved surfaces from mesoporous MOFs. • Show higher activity of lc-Fe-N 4 on low-curvature surfaces. • Exceptional ORR catalytic activity and stability in acidic electrolytes (0.82 V vs. RHE), comparable to commercial Pt/C. • Boost FeN 4 catalyst activity, unlocking the potential for broader electrocatalysis and energy storage applications. Iron-based single-atom catalysts (Fe-SACs) containing Fe–N 4 active sites have shown immense potential in the oxygen reduction reaction (ORR). However, the limited ability to adsorb O 2 and catalyze subsequent O–O bond breaking on Fe–N 4 sites has hindered their full potential, especially in acidic electrolytes. Here, we present an approach by utilizing a tunable curved surface to enhance the activity of Fe–N 4 active sites, with theoretical calculations, demonstrating that Fe–N 4 sites anchored on low–curvature surfaces (lc-Fe-N 4) is favirable for ORR. Experimental results show that the catalyst exhibits excellent catalytic activity and stability for ORR in acidic electrolytes, with a half-wave potential of 0.82 V vs. RHE, approaching that of commercial Pt/C. This work develops an approach for promoting the catalytic activity by anchoring atomically dispersed Fe–N 4 sites, unlocking their potential for extended use in electrocatalytic and energy storage applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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