TY - JOUR

T1 - Facile design and synthesis of nickle-molybdenum oxide/sulfide composites with robust microsphere structure for high-performance supercapacitors

AU - Yang, L.

AU - Huang, M.

AU - Lu, M.

AU - Guan, X.

AU - Wang, G.

AU - Jia, B.

PY - 2019/5/15

Y1 - 2019/5/15

N2 - 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.

AB - 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.

KW - Electrochemical performance

KW - Hybrid supercapacitor

KW - Microsphere structure

KW - Nickle-molybdenum oxide/sulfide composites

U2 - 10.1016/j.cej.2019.01.107

DO - 10.1016/j.cej.2019.01.107

M3 - Journal article

VL - 364

SP - 462

EP - 474

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

ER -