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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

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

Kamila Swagatika S Mohanty Bishnupad B Samantara Aneeya K AK Guha Puspendu P Ghosh Arnab A Jena Bijayalaxmi B Satyam Parlapalli V PV Mishra B K BK Jena Bikash Kumar BK

Scientific reports 20170821 1

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 f ...[more]

PMID: 28827746

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Project description:An aluminum double-layered electrode (DE-Al) was successfully employed as two electrodes in a symmetrical supercapacitor (double-layered electrode symmetric SC (DE-SC)) and as a positive layer of a triboelectric nanogenerator (DE-TENG) with the aim of energy conversion and storage using a selfsame structured, self-powered flexible device. A facile water-assisted oxidation (WAO) process and metal sputtering after the WAO process can allow the electrodes to greatly improve the active surface area and the conductivity, leading to the enhancement of the electrochemical performances of a supercapacitor (SC). Particularly, this double-layered structure fabrication process is extremely less time-consuming and cost-effective. The electrochemical test of the proposed DE-Al was systematically conducted by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS), along with the in-depth characterizations of the surface. From these studies, the DE-Al offers exceptional electrochemical properties compared with other structures, which were utilized as the electrodes in the polyvinyl alcohol/phosphoric acid (PVA/H3PO4) gel electrolyte. The improved performance apparently evidenced from the electrochemical tests of fabricated SC resulted from the enhanced electrical conductivity and large active surface area. The specific capacitance and cycle-life stability of the DE-SC were investigated by using a GCD analysis. Additionally, the EIS curves before and after stability test (for 3500 cycles) were obtained to prove the long-term endurance of DE-SC. A vertical contact and the separation mode of the TENG were also fabricated by using the same DE-Al as a positive layer and polydimethylsiloxane (PDMS) as a negative layer. Finally, the fabricated SC and TENG were successfully combined using a bridge rectifier to convert and store the mechanical energy as electrical energy. This simple design and facile fabrication of a double-layered-electrode-based structure is promising for the development of an energy conversion and storage device.

Dataset Information

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

Publications

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

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