Volume 19, Issue 48 2304750
Research Article

Building Atomic Scale and Dense Fe─N4 Edge Sites of Highly Efficient Fe─N─C Oxygen Reduction Catalysts Using a Sacrificial Bimetallic Pyrolysis Strategy

Zhaoyan Luo

Zhaoyan Luo

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 P. R. China

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Tingyi Zhou

Tingyi Zhou

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 P. R. China

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Yi Guan

Yi Guan

Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON, N6A 5B9 Canada

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Lei Zhang

Lei Zhang

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 P. R. China

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Qianling Zhang

Qianling Zhang

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 P. R. China

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Chuanxin He

Chuanxin He

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 P. R. China

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Xueliang Sun

Xueliang Sun

Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON, N6A 5B9 Canada

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Xiangzhong Ren

Corresponding Author

Xiangzhong Ren

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 P. R. China

E-mail: [email protected]

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First published: 03 August 2023
Citations: 6

Abstract

Replacing high-cost and scarce platinum (Pt) with transition metal and nitrogen co-doped carbon (M/N/C, M = Fe, Co, Mn, and so on) catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells has largely been impeded by the unsatisfactory ORR activity of M/N/C due to the low site utilization and inferior intrinsic activity of the M─N4 active center. Here, these limits are overcome by using a sacrificial bimetallic pyrolysis strategy to synthesize Fe─N─C catalyst by implanting the Cd ions in the backbone of ZIF-8, leading to exposure of inaccessible FeN4 edge sites (that is, increasing active site density (SD)) and high fast mass transport at the catalyst layer of cathode. As a result, the final obtained Fe(Cd)─N─C catalyst has an active site density of 33.01 µmol g−1 (with 33.01% site utilization) over 5.8 times higher than that of Fe─N─C catalyst. Specially, the optimal catalyst delivers a high ORR performance with a half-wave potential of 0.837 (vs RHE) in a 0.1 m HClO4 electrolyte, which surpasses most of Fe-based catalysts.

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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