Highly Efficient Quasi-Solid-State Asymmetric Supercapacitors Based on MoS2/MWCNT and PANI/MWCNT Composite Electrodes

Bing Cheng,Xiansheng Liu,Jinghao Huo,Furui Tan,Gentian Yue,Renzhi Cheng

doi:10.1186/s11671-019-2902-5

Abstract

Molybdenum disulfide (MoS2) and polyaniline (PANI) electrodes were decorated with multi-walled carbon nanotubes (MWCNTs) on the basis of a facial hydrothermal and in situ polymerization methods and served in the asymmetric supercapacitor (ASC). The MoS2 and MWCNTs with a mole ratio of 1:1 in MoS2|MWCNTs electrode exhibited better electrochemical properties through extensive electrochemical studies, in terms of the highest specific capacitance of 255.8 F/g at 1 A/g, low internal resistance, and notable electrochemical stability with retention of the initial specific capacitance at 91.6% after 1000 cycles. The as-prepared PANI|MWCNTs electrode also exhibited good specific capacitance of 267.5 F/g at 1 A/g and remained 97.9% capacitance retention after 1000 cycles. Then, the ASC with MoS2|MWCNTs and PANI|MWCNTs composite electrodes were assembled with polyvinyl alcohol (PVA)-Na2SO4 gel electrolyte, which displayed good electrochemical performance with the specific capacitance of 138.1 F/g at 1 A/g, and remained the energy density of 15.09 Wh/kg at a high power density of 2217.95 W/kg. This result shows that this ASC device possesses excellent electrochemical properties of high energy density and power output and thus showing a potential application prospect.

Highlights

IntroductionWith the energy crisis and environmental pollution increasing seriously, the efficient and stable energy storage equipment has attracted extensive research due to the intermittent energy sources (such as solar energy, wind power, and frictional power) cannot continuously and stably output electrical energy for daily application [1, 2]
With the energy crisis and environmental pollution increasing seriously, the efficient and stable energy storage equipment has attracted extensive research due to the intermittent energy sources cannot continuously and stably output electrical energy for daily application [1, 2]
The multi-walled carbon nanotubes (MWCNTs) have good conductivity and large specific surface area, which can compensate for the poor conductivity of Molybdenum disulfide (MoS2) and provide more active sites by the edge of MWCNTs

Summary

Introduction

With the energy crisis and environmental pollution increasing seriously, the efficient and stable energy storage equipment has attracted extensive research due to the intermittent energy sources (such as solar energy, wind power, and frictional power) cannot continuously and stably output electrical energy for daily application [1, 2]. A significant amount of electrode materials, like graphene, carbon nanotubes (CNTs), conducting polymers, and oxide metals, have become a. Among these reports, carbon materials are identified as one of the most popular because of their excellent conductivity, large surface area, environmental friendly protecting, and low cost. The carbon materials store charges by electric double-layer capacitor mechanism possess high electrical conductivity but low capacitance. Molybdenum disulfide (MoS2), as a typical family member of transition-metal dichalcogenides (TMDs), has attracted lots of attention for its special structural and chemical character, which is extensively applied in many fields including lithium-ion batteries, catalysis, and dye-sensitized solar cells. MoS2 with nanoscale recently has been chosen to use in capacitors

Methods

Results

Conclusion