Atomic-Level Construction of Tensile-Strained PdFe Alloy Surface toward Highly Efficient Oxygen Reduction Electrocatalysis.
- 影响因子：11.189
- DOI码：10.1021/acs.nanolett.9b05024
- 发表刊物：Nano Lett
- 关键字：oxygen reduction reaction, ligand effects, geometrical effects, flexible strategies
- 摘要：Exploring the high-performance non-Pt electrocatalysts for oxygen reduction reaction (ORR), the bottleneck process in fuel cells, is desirable but challenging. Here, we report the Pd@PdFe core–shell icosahedra as an active and durable electrocatalyst toward ORR in alkaline conditions, which feature a three-atomic-layer tensile-strained PdFe overlayer on Pd icosahedra. Our optimized catalyst shows 2.8-fold enhancement in mass activity and 6.9-fold enhancement in specific activity than commercial Pt/C catalyst toward ORR, representing one of the best non-Pt electrocatalysts. Moreover, the boosted ORR catalysis is strongly supported by the assembled fuel cell performance using Pd@PdFe core–shell icosahedra as the cathode electrocatalyst. The density functional theory calculations reveal that the synergistic coupling of tensile strain and alloy effects enables the optimum binding strength for intermediates, thus causing the maximum activity. The present work suggests the coupling between multiple surface modulations endows larger room for the rational design of remarkable catalysts.
- 合写作者：Xingxing Li, Chunxiao Liu, Pengfei Gao, Fawad Ahmad, Laihao Luo, Yifan Ye, Zhigang Geng, Guoxiong Wang, Rui Si, Jinlong Yang
- 第一作者：Xu Li
- 通讯作者：Hongwen Huang, Chao Ma, Jie Zeng
- 卷号：2020
- 期号：20
- 页面范围：1403-1409
- 是否译文：否
- 发表时间：2020/01/22
- 发布期刊链接：https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.9b05024
