过电位
双功能
析氧
电催化剂
纳米颗粒
电池(电)
催化作用
双功能催化剂
化学工程
材料科学
氧气
纳米技术
化学
电极
电化学
物理化学
有机化学
物理
功率(物理)
量子力学
工程类
作者
Katam Srinivas,Zhuo Chen,Fei Ma,Anran Chen,Ziheng Zhang,Yu Wu,Ming‐Qiang Zhu,Yuanfu Chen
标识
DOI:10.1016/j.apcatb.2023.122887
摘要
It is significant but challenging to develop a cost-effective, high-efficiency, and stable bifunctional electrocatalyst of oxygen reduction and evolution reactions (ORR and OER) for rechargeable Zn-air batteries. Herein, we present a novel bifunctional catalyst constructed by highly accessible atomically dispersed MNx sites coupled with core-shell nanoparticles (M-Phen-800; M = Fe, Co, and Ni) from easily accessible M-Phenanthroline (M-Phen) complexes. Due to the synergistically induced symmetric charge distribution around FeNx sites by Fe3C@C core-shell nanoparticles, Fe-Phen-800 exhibits exceptional onset (Eonset = 0.994 V) and half-wave (E1/2 = 0.878 V) potentials for ORR and a very low overpotential of 285 mV @ 10 mA cm−2 (Ej=10) for OER, indicating excellent bifunctional activity (ΔE = Ej=10 - E1/2 = 0.637 V) over the state-of-the-art Pt/C-RuO2 (0.702 V) combination. Moreover, the Fe-Phen-800-based Zn-air battery demonstrates a remarkable energy density of 1022 Wh kg−1 and greater cycling stability (>800 cycles) than the commercial Pt/C-RuO2 battery.
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