质子交换膜燃料电池
催化作用
质子化
材料科学
星团(航天器)
氧还原反应
金属
质子
甲醇
过渡金属
氧还原
化学工程
无机化学
化学
电化学
物理化学
有机化学
冶金
电极
离子
物理
量子力学
计算机科学
工程类
程序设计语言
作者
Dongping Xue,Shuyan Zhao,Bang‐An Lu,Yue Yu,Yifan Wei,Yin Hengbo,Jin‐Song Hu,Jianan Zhang
标识
DOI:10.1002/aenm.202303733
摘要
Abstract Fe─N─C materials with Fe─N 4 sites are considered as most promising non‐precious metal‐based electrocatalysts for low‐cost proton‐exchange‐membrane fuel cells (PEMFCs). Breaking the trade‐off between activity and stability has been a long‐standing challenge in the field of acidic oxygen reduction reaction (ORR). Herein, a “top‐down” thermally‐driven strategy is developed to achieve highly active pyrrolic N‐coordinated Fe sites in a high spin state with Fe atomic cluster (Fe n @Fe─N pyrr ─C) and discover that the neighboring Fe n cluster can synergistically stabilize such vulnerable Fe─N 4 sites by inhibiting their protonation. Consequently, the Fe n @Fe─N pyrr ─C catalysts exhibit much enhanced ORR activity and stability, endowing PEMFCs with a high power density of 804.6 mW cm −2 (testing conditions: 80 °C, 100% RH, 2.0 bar) and over 100 h durability (at 0.5 V). These findings open up opportunities for the exploration of durable Fe─N─C ORR electrocatalysts for non‐precious metal‐based PEMFCs and other applications.
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