1. Surface engineered PdNFe3 intermetallic electrocatalyst for boosting oxygen reduction in alkaline media.
- Author
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Liu, Jiamin, Zhang, Longhai, Liu, Jiaye, Xu, Zhihang, Zhang, Jiaxi, Liang, Lecheng, Du, Li, Song, Huiyu, Zhu, Ye, Li, Nanwen, and Cui, Zhiming
- Subjects
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OXYGEN reduction , *CORE materials , *ION-permeable membranes , *ELECTROLYTIC reduction , *DENSITY functional theory , *FUEL cells - Abstract
Surface engineering has been identified as an effective way to maximize the utilization of noble atoms and facilitate the oxygen reduction reaction. However, a cost-effective and highly durable platform for tailoring the electrocatalytic activity, is still absent. Herein, we demonstrate a new and promising catalytic material of antiperovskite-typed PdNFe 3 and construct a high performance PdNFe 3 @Pd catalyst with atomic layers of strained Pd shell. The PdNFe 3 @Pd/C catalyst presents a high mass activity (MA) of 1.14 A mg−1 Pd at 0.9 V, which is 9 and 6 times higher than those of the Pt/C and Pd/C, respectively. More importantly, the excellent performance of PdNFe 3 @Pd/C was also verified in anion-exchange membrane fuel cells and rechargeable Zn−air batteries. Density functional theory calculations reveal that the strain effect aroused by the lattice mismatch between PdNFe 3 core and Pd shell contributes to the enhanced ORR performance by optimizing the binding strength of oxygen intermediates on Pd. [Display omitted] • Demonstrating a new class of platform/core materials for constructing core-shell catalysts. • Elucidating catalytic mechanism of PdNFe 3 @Pd towards ORR. • Extraordinary catalytic performance towards oxygen reduction. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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