Mo-Doped Zn, Co Zeolitic Imidazolate Framework-Derived Co 9 S 8 Quantum Dots and MoS 2 Embedded in Three-Dimensional Nitrogen-Doped Carbon Nanoflake Arrays as an Efficient Trifunctional Electrocatalysts for the Oxygen Reduction Reaction, Oxygen Evolution Reaction, and Hydrogen Evolution Reaction

作者：Wenming Zhang, Xinyan Zhao, Youwei Zhao, Jiaqing Zhang, Xiaoting Li, Lide Fang, Ling Li · 发表于：ACS Applied Materials & Interfaces · 年份：2020 · DOI：10.1021/acsami.9b19193 · 被引用次数：87 · 研究领域：Electrocatalysts for Energy Conversion、Advanced Photocatalysis Techniques、Advanced battery technologies research

Herein, we first propose a facile strategy to synthesize Co 9 S 8 and MoS 2 nanocrystals embedded in porous carbon nanoflake arrays supported on carbon nanofibers (Co 9 S 8 -MoS 2 /N-CNAs@CNFs) by the pyrolysis of Mo-doped Zn, Co zeolitic imidazolate framework grown on carbon nanofibers and subsequent sulfuration. The electrocatalyst shows high and stable electrocatalytic performance, with a half-wave potential of 0.82 V for oxygen reduction reaction and an overpotential at 10 mA cm –2 for oxygen evolution reaction (0.34 V) and hydrogen evolution reaction (0.163 V), which outperform the metal–organic framework-derived transition metal sulfide catalysts reported so far. Furthermore, the Co 9 S 8 -MoS 2 @N-CNAs@CNFs are employed as an air cathode in a liquid-state and all-solid-state zinc-air battery, presenting high power densities of 222 and 96 mW cm –2, respectively. Such excellent catalytic activities are mainly owing to the unique three-dimensional structure and chemical compositions, optimal electronic conductivity, adequate surface area, and the abundance of active sites. Thus, this work provides an important method for designing other metal–organic framework-derived three-dimensional structural sulfide quantum dot multifunctional electrocatalysts for wider application in highly efficient catalysis and energy storage.