双金属片
催化作用
材料科学
碳纤维
化学工程
拉曼光谱
热解
X射线光电子能谱
兴奋剂
电池(电)
纳米技术
无机化学
金属
化学
冶金
复合材料
有机化学
复合数
功率(物理)
物理
光电子学
光学
量子力学
工程类
作者
Kang Yang,Yi Cheng,Ying Lei,Qian Yang,Xiyuan Liu,Tiecheng Lu,Huaming Xie,Jianying Li,Zan Tong,Honghui Wang
标识
DOI:10.1016/j.jssc.2023.124401
摘要
Metal sites or nanoparticles immobilized on MOF-derived porous carbon matrix have gained enormous attention for oxygen electroreduction reaction (ORR), but they still suffered from the insufficient catalytic performance. Herein, we introduced edge defects to regulate the ORR performance of N-doped carbon polyhedron-supported FeCo bimetallic catalysts via a facile NaCl/KCl-assisted pyrolysis. HR-TEM, HAADF-STEM, Raman spectra, XPS and EPR analysis confirmed the existence of uniform FeCo atoms and edge defects within N-doped porous carbon polyhedrons and their mutual effect helped promoting ORR performance. The resulting FeCo-NC-30 exhibited more excellent ORR activity with E1/2 of 0.86 V, and faster kinetic process with a higher kinetic current density, Jk,E = 0.85V = 7.15 mA/cm2. As a cathode catalyst, it delivered a desirable power density of 196.9 mW/cm2, comparable to Pt/C, in home-made Zn-air batteries. Our findings demonstrated that the electronic tuning effect caused by carbon edge defects and synergistic bimetallic interactions is beneficial for enhancing ORR activity.
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