期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 305, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.121058
关键词
Single-atom catalysts; Utilization efficiency; Oxygen reduction reactions
资金
- Shenzhen Government's Plan of Science and Technology [JCYJ20190808121407676, 20200813142301001]
- Natural Science Foundation of Guangdong [2020A1515011127, 2020A1414010087]
- National Natural Science Foundation of China [22178223]
A novel strategy was reported to prepare an Fe-SAC with all Fe atoms anchored on the surface of carbon nanospheres, showing an extraordinary UE of 80% for ORR. The Fe migration across the silica shell inhibits Fe aggregation and allows Fe atoms to anchor on the surface, leading to excellent ORR activity at low Fe content.
Single-atom catalysts (SAC) stabilized by nitrogen in carbon support are promising candidates for oxygen reduction reaction (ORR). However, conventional preparation methods usually lead to encapsulation of metallic centers in matrix and thus the utilization efficiency (UE) is underexploited. Herein, we report a novel strategy to prepare an Fe-SAC with all Fe atoms anchored on the surface of carbon nanospheres, which exhibited an extraordinary UE of 80% for ORR. This efficiency was achieved by coating polydopamine spheres with silica, followed by the pyrolysis of their blend with FeCl3. During thermal treatment, Fe migrates across the silica shell by atomic exchange with silicon, which inhibits the aggregation of Fe and allows Fe atoms to anchor on the surface. As such, it showed excellent ORR activity at a low Fe content. Zn-air batteries assembled using this catalyst showed a peak power density of 113 mW cm(-2) and specific capacity of 710 mAh g(Zn)(-1).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据