期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 41, 页码 23444-23450出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta07488a
关键词
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资金
- National Key Research and Development Program of China [2020YFB1505800, 2017YFA0206500]
- National Natural Science Foundation of China [21773190, 21721001, 21771153, 21931009, 22071202]
- Fundamental Research Funds for the Central Universities [20720210016, 20720210104]
By constructing trimetallic PtNiCo branched nanocages, the activity and durability of Pt-based alloy electrocatalysts in ORR and MOR have been significantly enhanced, with a 13.8- and 5.6-times improvement in specific activity compared to Pt/C. The alloying effect optimizes the electronic structure of the catalyst, leading to improved performance and CO-tolerance.
Engineering the composition and structure of Pt-based alloy electrocatalysts has exhibited great promise for enhancing activity and durability in the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). However, it remains a great challenge to completely achieve this goal because of sluggish kinetics and surface CO poisoning. Herein, we successfully constructed trimetallic PtNiCo branched nanocages via a simple etching treatment. The trimetallic PtNiCo nanocages exhibited outstanding activity and durability in both acidic ORR and MOR. Strikingly, the mass activity of the catalyst in ORR and MOR reached 1.03 A mg(Pt)(-1) and 2.82 A mg(Pt)(-1), with 13.8- and 5.6-times enhancement of specific activity compared to Pt/C. Detailed investigations reveal that the most optimized electronic structure for the d-band center (a 0.17 eV downshift compared to pure Pt) by the alloying effect of Co and Ni contributed to the enhanced performances and great CO-tolerance of such unique Pt-based catalysts, which provide a new perspective for designing high-performance electrocatalysts for commercial fuel cells.
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