化学
合金
催化作用
电催化剂
三元运算
金属
X射线吸收光谱法
过渡金属
无机化学
X射线光电子能谱
化学工程
电化学
电极
物理化学
吸收光谱法
有机化学
计算机科学
工程类
物理
量子力学
程序设计语言
作者
Xinbing Zhao,Hao Cheng,Xiaobo Chen,Qi Zhang,Chenzhao Li,Fan Yang,Nebojša Marinković,Lu Ma,Jin‐Cheng Zheng,Kotaro Sasaki
摘要
The development of Pt-based catalysts for use in fuel cells that meet performance targets of high activity, maximized stability, and low cost remains a huge challenge. Herein, we report a nitrogen (N)-doped high-entropy alloy (HEA) electrocatalyst that consists of a Pt-rich shell and a N-doped PtCoFeNiCu core on a carbon support (denoted as N–Pt/HEA/C). The N–Pt/HEA/C catalyst showed a high mass activity of 1.34 A mgPt–1 at 0.9 V for the oxygen reduction reaction (ORR) in rotating disk electrode (RDE) testing, which substantially outperformed commercial Pt/C and most of the other binary/ternary Pt-based catalysts. The N–Pt/HEA/C catalyst also demonstrated excellent stability in both RDE and membrane electrode assembly (MEA) testing. Using operando X-ray absorption spectroscopy (XAS) measurements and theoretical calculations, we revealed that the enhanced ORR activity of N–Pt/HEA/C originated from the optimized adsorption energy of intermediates, resulting in the tailored electronic structure formed upon N-doping. Furthermore, we showed that the multiple metal–nitrogen bonds formed synergistically improved the corrosion resistance of the 3d transition metals and enhanced the ORR durability.
科研通智能强力驱动
Strongly Powered by AbleSci AI