期刊
SCIENCE BULLETIN
卷 66, 期 21, 页码 2207-2216出版社
ELSEVIER
DOI: 10.1016/j.scib.2021.07.001
关键词
Fuel cells; Oxygen reduction reaction; Electrocatalyst; Low-platinum alloy; Nanocarbon
资金
- National Natural Science Foundation of China [22075092, 21805104]
- Program for Huazhong University of Science and Technology (HUST) Academic Frontier Youth Team [2018QYTD15]
- Innovation and Talent Recruitment Base of New Energy Chemistry and Device [B21003]
Efficient platinum-based electrocatalysts are crucial for fuel cells, and an integrated electrocatalyst of ultralow-Pt alloy encapsulated into nitrogen-doped nanocarbon architecture has been developed for efficient oxygen reduction reaction. The hybrid Pt-based catalyst shows excellent mass activity and stability, with potential practical applications in the future.
Developing efficient platinum (Pt)-based electrocatalysts is enormously significant for fuel cells. Herein, we report an integrated electrocatalyst of ultralow-Pt alloy encapsulated into nitrogen-doped nanocarbon architecture for efficient oxygen reduction reaction. This hybrid Pt-based catalyst achieves a mass activity of 3.46 A mg(pt)(1) at the potential of 0.9 V vs. RHE with a negligible stability decay after 10,000 cycles. More importantly, this half-cell activity can be expressed at full cell level with a high Pt utilization of 10.22Wmg(Ptcathode)(1) and remarkable durability after 30,000 cycles in single-cell. Experimental and theoretical investigations reveal that a highly strained Pt structure with an optimal Pt-O binding energy is induced by the incorporation of Co/Ni into Pt lattice, which would account for the improved reaction kinetics. The synergistic catalysis due to nitrogen-doped nanocarbon architecture and active Pt component is responsible for the enhanced catalytic activity. Meanwhile, the strong metal-support interaction and optimized hydrophilic properties of nanocarbon matrix facilitate efficient mass transport and water management. This work may provide significant insights in designing the low-Pt integrated electrocatalysts for fuel cells and beyond. (C) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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