3D N-doped ordered mesoporous carbon supported single-atom Fe-N-C catalysts with superior performance for oxygen reduction reaction and zinc-air battery

被引：440

作者：

Han, Junxing ^{[1
,2
]}

Bao, Hongliang ^{[3
]}

Wang, Jian-Qiang ^{[3
]}

Zheng, Lirong ^{[4
]}

Sun, Shaorui ^{[5
]}

Wang, Zhong Lin ^{[1
,2
,6
]}

Sun, Chunwen ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, CAS Ctr Excellence Nanosci, Beijing Inst Nanoenergy & Nanosyst, Beijing 100083, Peoples R China

[2] Univ Chinese Acad Sci, Sch Nanosci & Technol, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China

[4] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China

[5] Beijing Univ Technol, Coll Environm & Energy Engn, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China

[6] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 280卷

基金：

美国国家科学基金会;

关键词：

accessible active site; ordered mesoporous carbon; oxygen reduction reaction; single-atom electrocatalyst; zinc-air battery; EFFICIENT ELECTROCATALYST; ACTIVE-SITES; IRON; ARRAYS;

D O I：

10.1016/j.apcatb.2020.119411

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Single-atom Fe-N-C electrocatalysts have emerged as the most promising oxygen reduction reaction (ORR) catalyst. However, the low Fe loading and inaccessibility of Fe-N-C sites limit the overall ORR activity. Here, we report an efficient single-atom electrocatalyst (Fe-N-C/N-OMC) with Fe-N-C sites embedded in three-dimensional (3D) N-doped ordered mesoporous carbon framework. Fe-N-C/N-OMC shows high half-wave potential, kinetic current density, turnover frequency and mass activity towards ORR in alkaline electrolyte. Experiments and theoretical calculations suggest that the ultra-high ORR activity stems from the boosted intrinsic activity of FeN4 sites by graphitic N dopants, high density of accessible active site generated by high Fe and N loadings and ordered mesoporous carbon structure as well as facilitated mass and electron transport in 3D interconnected pores. Fe-N-C/N-OMC also shows comparable ORR activity to PVC in acidic electrolyte. As the cathode for zinc-air battery, Fe-N-C/N-OMC exhibits high open-circuit voltage, high power density and remarkable durability.

引用

页数：10

共 49 条

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