Mo-Doped Zn, Co Zeolitic Imidazolate Framework-Derived Co9S8 Quantum Dots and MoS2 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

• DOI: 10.1021/acsami.9b19193
• Publication Date: 2020-02-12T21:42:37Z
• Authors: Wenming Zhang; Xinyan Zhao; Youwei Zhao; Jiaqing Zhang; Xiaoting Li; Lide Fang; Ling Li
• Keywords: Imidazolate; Zeolitic imidazolate framework; Overpotential; Carbon fibers

Herein, we first propose a facile strategy to synthesize Co9S8 and MoS2 nanocrystals embedded in porous carbon nanoflake arrays supported on nanofibers (Co9S8-MoS2/N-CNAs@CNFs) by the pyrolysis of Mo-doped Zn, Co zeolitic imidazolate framework grown subsequent sulfuration. The electrocatalyst shows high stable electrocatalytic performance, with half-wave potential 0.82 V for oxygen reduction reaction an overpotential at 10 mA cm-2 evolution (0.34 V) hydrogen (0.163 V), which outperform metal-organic framework-derived transition metal sulfide catalysts reported so far. Furthermore, Co9S8-MoS2@N-CNAs@CNFs are employed as air cathode liquid-state all-solid-state zinc-air battery, presenting power densities 222 96 mW cm-2, respectively. Such excellent catalytic activities mainly owing unique three-dimensional structure chemical compositions, optimal electronic conductivity, adequate surface area, abundance active sites. Thus, this work provides important method designing other structural quantum dot multifunctional electrocatalysts wider application highly efficient catalysis energy storage.