Journal of Energy Chemistry ›› 2023, Vol. 86 ›› Issue (11): 158-166.DOI: 10.1016/j.jechem.2023.07.019

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High-entropy L12-Pt(FeCoNiCuZn)3 intermetallics for ultrastable oxygen reduction reaction

Qian Zhanga, Tao Shena, Min Songa, Shuang Wanga, Jialin Zhangb, Xiao Huanga, Shanfu Lub, Deli Wanga,*   

  1. aKey Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
    bBeijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing 100191, China
  • Received:2023-05-10 Revised:2023-07-23 Accepted:2023-07-23 Online:2023-11-15 Published:2023-11-07
  • Contact: *E-mail address: wangdl81125@hust.edu.cn (D. Wang).

Abstract: Enhancing the stability of Pt-based electrocatalysts for the sluggish cathodic oxygen reduction reaction (ORR) is critical for proton exchange membrane fuel cells (PEMFCs). Herein, high-entropy intermetallic (HEI) L12-Pt(FeCoNiCuZn)3 is designed for durable ORR catalysis. Benefiting from the unique HEI structure and the enhanced intermetallic phase stability, Pt(FeCoNiCuZn)3/C nanoparticles demonstrate significantly improved stability over Pt/C and PtCu3/C catalysts. The Pt(FeCoNiCuZn)3/C exhibits a negligible decay of the half-wave potential during 30,000 potential cycles from 0.6 to 1.0 V, whereas Pt/C and PtCu3/C are negatively shifted by 46 and 36 mV, respectively. Even after 10,000 cycles at potential up to 1.5 V, the mass activity of Pt(FeCoNiCuZn)3/C still shows ∼70% retention. As evidenced by the structural characterizations, the HEI structure of Pt(FeCoNiCuZn)3/C is well maintained, while PtCu3/C nanoparticles undergo severe Cu leaching and particle growth. In addition, when assembled Pt(FeCoNiCuZn)3/C as the cathode in high-temperature PEMFC of 160 °C, the H2-O2 fuel cell delivers almost no degradation even after operating for 150 h, demonstrating the potential for fuel cell applications. This work provides a facile design strategy for the development of high-performance ultrastable electrocatalysts.

Key words: High-entropy intermetallics, Pt-based electrocatalysts, Oxygen reduction reaction, High stability