Volume 63, Issue 24 e202400549
Research Article

Strategies for Achieving Ultra-Long ORR Durability—Rh Activates Interatomic Interactions in Alloys

Xiaoke Li

Xiaoke Li

National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, 22 Hankou Road, Nanjing, 210093 P. R. China

Institute of Energy Power Innovation, North China Electric Power University, 2 Beinong Road, Beijing, 102206 P. R. China.

These authors contributed equally to this work

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Xiao Duan

Xiao Duan

National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, 22 Hankou Road, Nanjing, 210093 P. R. China

These authors contributed equally to this work

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Siao Zhang

Siao Zhang

Institute of Energy Power Innovation, North China Electric Power University, 2 Beinong Road, Beijing, 102206 P. R. China.

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Chuanjie Wang

Chuanjie Wang

Institute of Energy Power Innovation, North China Electric Power University, 2 Beinong Road, Beijing, 102206 P. R. China.

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Kang Hua

Kang Hua

National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, 22 Hankou Road, Nanjing, 210093 P. R. China

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Zejin Wang

Zejin Wang

National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, 22 Hankou Road, Nanjing, 210093 P. R. China

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Yongkang Wu

Yongkang Wu

National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, 22 Hankou Road, Nanjing, 210093 P. R. China

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Dr. Jia Li

Corresponding Author

Dr. Jia Li

Institute of Energy Power Innovation, North China Electric Power University, 2 Beinong Road, Beijing, 102206 P. R. China.

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Prof. Jianguo Liu

Corresponding Author

Prof. Jianguo Liu

Institute of Energy Power Innovation, North China Electric Power University, 2 Beinong Road, Beijing, 102206 P. R. China.

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First published: 09 April 2024
Citations: 11

Graphical Abstract

By modulating the interatomic interactions between the constituent atoms of the catalyst, a novel approach has been introduced to prevent the dissolution of transition metals, resulting in ultra-long durability in the oxygen reduction reaction (ORR). Rh−Pt3Co/C catalysts demonstrate high activity and excellent durability with low platinum group metal (PGM) loading.

Abstract

The stability of platinum-based alloy catalysts is crucial for the future development of proton exchange membrane fuel cells, considering the potential dissolution of transition metals under complex operating conditions. Here, we report on a Rh-doped Pt3Co alloy that exhibits strong interatomic interactions, thereby enhancing the durability of fuel cells. The Rh−Pt3Co/C catalyst demonstrates exceptional catalytic activity for oxygen reduction reactions (ORR) (1.31 A mgPt−1 at 0.9 V vs. the reversible hydrogen electrode (RHE) and maintaining 92 % of its mass activity after 170,000 potential cycles). Long-term testing has shown direct inhibition of Co dissolution in Rh−Pt3Co/C. Furthermore, tests on proton exchange membrane fuel cells (PEMFC) have shown excellent performance and long-term durability with low Pt loading. After 50,000 cycles, there was no voltage loss at 0.8 A cm−2 for Rh−Pt3Co/C, while Pt3Co/C experienced a loss of 200 mV. Theoretical calculations suggest that introducing transition metal atoms through doping creates a stronger compressive strain, which in turn leads to increased catalytic activity. Additionally, Rh doping increases the energy barrier for Co diffusion in the bulk phase, while also raising the vacancy formation energy of the surface Pt. This ensures the long-term stability of the alloy over the course of the cycle.

Conflict of interests

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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