Journal of Energy Chemistry ›› 2023, Vol. 85 ›› Issue (10): 276-287.DOI: 10.1016/j.jechem.2023.06.023

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Enhanced rate and specific capacity in nanorod-like core-shell crystalline NiMoO4@amorphous cobalt boride materials enabled by Mott-Schottky heterostructure as positive electrode for hybrid supercapacitors

Jing-Feng Houa,b, Jian-Fei Gaoa,b, Ling-Bin Konga,b,*   

  1. aState Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;
    bSchool of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
  • Received:2023-04-30 Revised:2023-06-09 Accepted:2023-06-17 Online:2023-10-15 Published:2023-11-06
  • Contact: *E-mail address: konglb@lut.edu.cn (L.-B. Kong).

Abstract: The supercapacitor electrode materials suffer from structure pulverization and sluggish electrode kinetics under high current rates. Herein, a unique NiMoO4@Co-B heterostructure composed of highly conductive Co-B nanoflakes and a semiconductive NiMoO4 nanorod is designed as an electrode material to exert the energy storage effect on supercapacitors. The formed Mott-Schottky heterostructure is helpful to overcome the ion diffusion barrier and charge transfer resistance during charging and discharging. Moreover, this crystalline-amorphous heterogeneous phase could provide additional ion storage sites and better strain adaptability. Remarkably, the optimized NiMoO4@Co-B hierarchical nanorods (the mass ratio of NiMoO4/Co-B is 3:1) present greatly enhanced electrochemical characteristics compared with other components, and show superior specific capacity of 236.2 mA h g-1 at the current density of 0.5 A g-1, as well as remarked rate capability. The present work broadens the horizons of advanced electrode design with distinct heterogeneous interface in other energy storage and conversion field.

Key words: Crystalline-amorphous heterophase, Mott-Schottky heterostructure, Energy storage, Nickel molybdate