Highly Active 2D Layered MoS ₂ -rGO Hybrids for Energy Conversion and Storage Applications.

ABSTRACT: The development of efficient materials for the generation and storage of renewable energy is now an urgent task for future energy demand. In this report, molybdenum disulphide hollow sphere (MoS₂-HS) and its reduced graphene oxide hybrid (rGO/MoS₂-S) have been synthesized and explored for energy generation and storage applications. The surface morphology, crystallinity and elemental composition of the as-synthesized materials have been thoroughly analysed. Inspired by the fascinating morphology of the MoS₂-HS and rGO/MoS₂-S materials, the electrochemical performance towards hydrogen evolution and supercapacitor has been demonstrated. The rGO/MoS₂-S shows enhanced gravimetric capacitance values (318?±?14 Fg^-1) with higher specific energy/power outputs (44.1?±?2.1 Whkg^-1 and 159.16?±?7.0 Wkg^-1) and better cyclic performances (82?±?0.95% even after 5000 cycles). Further, a prototype of the supercapacitor in a coin cell configuration has been fabricated and demonstrated towards powering a LED. The unique balance of exposed edge site and electrical conductivity of rGO/MoS₂-S shows remarkably superior HER performances with lower onset over potential (0.16?±?0.05?V), lower Tafel slope (75?±?4 mVdec^-1), higher exchange current density (0.072?±?0.023 mAcm^-2) and higher TOF (1.47?±?0.085?s^-1) values. The dual performance of the rGO/MoS₂-S substantiates the promising application for hydrogen generation and supercapacitor application of interest.

SUBMITTER: Kamila S 

PROVIDER: S-EPMC5566394 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature