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Facile design and synthesis of nickle-molybdenum oxide/sulfide composites with robust microsphere structure for high-performance supercapacitors

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  • L. Yang
  • M. Huang
  • M. Lu
  • X. Guan
  • G. Wang
  • B. Jia
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<mark>Journal publication date</mark>15/05/2019
<mark>Journal</mark>Chemical Engineering Journal
Volume364
Number of pages13
Pages (from-to)462-474
Publication StatusPublished
Early online date22/01/19
<mark>Original language</mark>English

Abstract

This study has reported a simple strategy for the fabrication of nickle-molybdenum oxide/sulfide composites (NiMo-O-S) with microsphere structure, using a simple two-step method including a facile hydrothermal process and a post solution sulfidation treatment. The electrochemical performance of the as-prepared Ni-Mo-O-S composites is carefully evaluated as the working electrode. Additionally, the effects of material preparation conditions on the specific capacitance of the as-prepared composites are also fully investigated and summarized, including the S2- concentration, sulfidation temperature and reaction time. In this work, high-performance electrode materials could be easily achieved under a wide range of preparation conditions. Specifically, the NiMo-O-S composites could deliver a high specific capacitance of 2177.5 F.g(-1) at a current density of 1 A.g(-1), and after cycling for 5000 times, the specific capacitance could retain 86.25% of its initial value. Besides, the corresponding hybrid supercapacitor (Ni-Mo-O-S//AC HSC) achieves a high energy density of 50.61 Wh.kg(-1) at a power density of 850 W.kg(-1), and possesses excellent longterm electrochemical cycling stability (93.38% capacitance retention after 10,000 cycles). Our work has provided a low-cost, feasible and promising way to prepare high-performance electrode materials for supercapacitors.