Single atom Fe-based catalyst derived from hierarchical (Fe,N)-ZIF-8/CNFs for high-efficient ORR activity

被引：24
作者：
Miao, Wenfang [1 ]
Huang, Feirong [1 ]
Shen, Xiaochen [1 ]
Li, Shaopeng [1 ]
Cao, Xingru [1 ]
Zhang, Xuefeng [2 ]
Yu, Jieyi [2 ]
Dong, Xinglong [1 ]
机构：
[1] Dalian Univ Technol, Sch Mat Sci & Engn, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China
[2] Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Inst Adv Magnet Mat, Hangzhou 110819, Peoples R China
来源：
MATERIALS CHEMISTRY FRONTIERS | 2022年 / 6卷 / 21期
基金：
中国国家自然科学基金;
关键词：
OXYGEN REDUCTION; IRON; CARBON; SITES; ELECTROCATALYST; FRAMEWORKS; STABILITY; NITROGEN;
D O I：
10.1039/d2qm00763k
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The development of high-efficiency, stable, and low-cost Fe-N-C electrocatalysts for the oxygen reduction reaction (ORR) has attracted considerable attention. Herein, a stable atomically dispersed Fe-Nx-based catalyst was synthesized from a hierarchical structure involving carbon nanofiber (CNF)-supported zeolitic-imidazolate-framework-8 (ZIF-8) encapsulated Fe-Phen complex ((Fe,N)-ZIF-8/CNFs). The Fe-Nx-CNFs obtained from the pyrolysis of (Fe,N)-ZIF-8/CNFs showed a good hierarchical multi-layer structure. The natural network structure of the carbon nanofibers serves as a matrix to uniformly distribute the ZIF-8 particles, and the Fe-Nx sites derived from the Fe-Phen complex were uniformly distributed in ZIF-8 particles. It exhibits excellent ORR performance with a high half-wave potential of 0.875 V (vs. RHE), which was 55 mV higher than that of the commercial Pt/C catalyst. In addition, density functional theory (DFT) calculations on the catalyst further revealed the origin of the ORR activity via a 4e(-) pathway from the precise local coordination of FeN4 sites.
引用
收藏
页码：3213 / 3224
页数：12
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