催化作用
材料科学
电催化剂
电化学
碳纤维
化学工程
过渡金属
阴极
质子交换膜燃料电池
纳米颗粒
金属
纳米技术
无机化学
电极
冶金
化学
复合材料
复合数
有机化学
物理化学
工程类
作者
Mi-Ju Kim,Sungjin Kim,Ji Eun Park,Chan–Cuk Hwang,Seunggyeong Lee,Sun Young Kang,Dae-Sung Jung,Yong‐Hun Cho,Jaekook Kim,Kug‐Seung Lee,Yung‐Eun Sung
出处
期刊:Nano Energy
[Elsevier]
日期:2020-12-01
卷期号:78: 105395-105395
被引量:35
标识
DOI:10.1016/j.nanoen.2020.105395
摘要
The electrochemical oxygen reduction reaction (ORR) is a critical reaction in many energy conversion and storage systems, including fuel cells and metal–air batteries. Nonprecious-metal-based catalysts have captured attention for realizing viable and sustainable devices. However, in Fe-based catalysts, the efficient utilization of active sites, Fe–Nx and Fe coated on a carbon layer ([email protected]), is challenging owing to difficulties in controlling these active sites during synthesis. In this study, FeNC electrocatalysts with varying Fe/C ratios show different [email protected]/Fe–Nx ratios and ORR activities. Increasing the carbon content increases the Fe–Nx site density while decreasing the size of the Fe nanoparticles and the thickness of the carbon coating layer, thus enhancing the ORR activity. As cathode materials for anion exchange membrane fuel cells and Zn–air batteries, the FeNC electrocatalysts exhibit excellent performance when compared to Pt catalysts and previously reported transition-metal-based catalysts. Based on the structural changes observed by in situ X-ray absorption fine structure analysis during electrochemical operation, these catalysts were found to contain electrocatalytically efficient Fe–N4 sites. This work provides efficient strategies for designing high-performance catalysts for the ORR.
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