MoS₂/CoS₂ composites composed of CoS₂ octahedrons and MoS₂ nano-flowers for supercapacitor electrode materials

Abstract

In pursuing excellent supercapacitor electrodes, we designed a series of MoS₂/CoS₂ composites consisting of flower-liked MoS₂ and octahedron-shaped CoS₂ through a facile one-step hydrothermal method and investigated the electrochemical performance of the samples with various hydrothermal time. Due to the coupling of two metal species and a big amount of well-developed CoS₂ and MoS₂, the results indicated that the MoS₂/CoS₂ composites electrodes exhibited the best electrochemical performance with a large specific capacitance of 490 F/g at 2 mV/s or 400 F/g at 10 A/g among all samples as the hydrothermal time reached 48 h (MCS48). Furthermore, the retention of MCS48 is 93.1% after 10000 cycles at 10 A/g, which manifests the excellent cycling stability. The outstanding electrochemical performance of MCS48 indicates that it could be a very promising and novel energy storage material for supercapacitors in the future.

Keywords

MoS₂/CoS₂ composites / hydrothermal time / electrochemical properties / supercapacitors

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Acknowledgement

This work was supported by the National Natural Science Foundation of China (Grant No. 51572145).

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2018 Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature