Chemical state of surrounding iron species affects the activity of Fe-N-x for electrocatalytic oxygen reduction

doi:10.1016/j.apcatb.2019.03.046

CORC > 化学研究所 > 中国科学院化学研究所

	Chemical state of surrounding iron species affects the activity of Fe-N-x for electrocatalytic oxygen reduction
	Li, Zhongtao; Wei, Liangqin; Jiang, Wen-Jie; Hu, Zhenpeng; Luo, Hao; Zhao, Weinan; Xu, Tao; Wu, Wenting; Wu, Mingbo; Hu, Jin-Song
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2019-08-15
卷号	251 页码:240-246
ISSN号	0926-3373
DOI	10.1016/j.apcatb.2019.03.046
英文摘要	Fe-N-C materials with Fe-N-x coordination sites are promising to replace the state-of-the-art Pt-based electrocatalysts for oxygen reduction reaction (ORR) due to high activity and low cost although there is still debate on its activity origin. Herein, we develop a strategy to investigate the role of iron species in Fe-N-C nanohybrids for catalysing ORR by delicately tuning the iron chemical state. By engineering peripheral substituents of iron porphyrin precursors, two Fe-N-C nanohybrids with metallic or oxidized iron species inside are achieved while holding the similar catalyst structure. Systematic experiments and theoretical analysis discover that metallic iron species promote the electrocatalytic activity of Fe-N-x sites for ORR, while oxidative ones inhibit O-2 adsorption on Fe-N-x sites, decreasing their ORR activity. This finding sheds light on unravelling the activity origin in Fe-N-C electrocatalysts for ORR towards their applications in energy devices.
语种	英语
WOS记录号	WOS:000468014400025
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/82661]
专题	中国科学院化学研究所
作者单位	Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Li, Zhongtao,Wei, Liangqin,Jiang, Wen-Jie,et al. Chemical state of surrounding iron species affects the activity of Fe-N-x for electrocatalytic oxygen reduction[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2019,251:240-246.
APA	Li, Zhongtao.,Wei, Liangqin.,Jiang, Wen-Jie.,Hu, Zhenpeng.,Luo, Hao.,...&Hu, Jin-Song.(2019).Chemical state of surrounding iron species affects the activity of Fe-N-x for electrocatalytic oxygen reduction.APPLIED CATALYSIS B-ENVIRONMENTAL,251,240-246.
MLA	Li, Zhongtao,et al."Chemical state of surrounding iron species affects the activity of Fe-N-x for electrocatalytic oxygen reduction".APPLIED CATALYSIS B-ENVIRONMENTAL 251(2019):240-246.