Heterogeneous CoFe-Co8FeS8 nanoparticles embedded in CNT networks as highly efficient and stable electrocatalysts for oxygen evolution reaction

被引：89

作者：

Wang, Bin ^{[1
]}

Hu, Yang ^{[1
]}

Yu, Bo ^{[1
]}

Zhang, Xiaojuan ^{[1
]}

Yang, Dongxu ^{[1
]}

Chen, Yuanfu ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Sichuan, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2019年 / 433卷

基金：

中国国家自然科学基金;

关键词：

CoFe/Co8FeS8; nanoparticles; Electrocatalyst; Oxygen evolution reaction; Synergistic effect; REDUCED GRAPHENE OXIDE; IN-SITU; DOPED CARBON; BIFUNCTIONAL ELECTROCATALYST; HYDROGEN; PERFORMANCE; COP; REDUCTION; STABILITY; CATALYSTS;

D O I：

10.1016/j.jpowsour.2019.05.094

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：

It is essential to explore high-efficiency and low-cost electrocatalysts to replace noble metal based electrocatalysts for promoting the efficiency of water splitting and obtaining clean hydrogen energy. Herein, for the first time, self-assembled heterogeneous CoFe-Co8FeS8 nanoparticles embedded in CNT networks (CoFe/Co8FeS8/CNT) are synthesized via a facile microwave-assisted sulfidation and annealing process. Compared to CoFe/CNT or Co8FeS8/CNT, the CoFe/Co8FeS8/CNT delivers much better performance for oxygen evolution reaction (OER): it shows an Ultralow Tafel slope of 38 mV dec(-1); it affords a large current density of 10 mA cm(-2) only requiring a small overpotential of 290 mV; in addition, it demonstrates good long-term stability. The outstanding OER performance of CoFe/Co8FeS8/CNT is attributed to its unique porous nanoarchitecture constructed by heterogeneous CoFe-Co8FeS8 nanoparticles homogenously embedded in highly conductive CNT networks, which can not only enable full utilization of electrocatalytic active sites and provide conductive pathways for efficient charge transfer between nanoparticles and CNT, but also accelerate gas bubbles evolving and releasing. This work provides insight into microwave-assisted synthesis of highly efficient non-precious transition metal sulfide based electrocatalysts with rationally designed nanoarchitecture for OER.

引用

页数：8

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