Asymmetric supercapacitor of functionalised electrospun carbon fibers/poly(3,4-ethylenedioxythiophene)/manganese oxide//activated carbon with superior electrochemical performance

Muhammad Amirul Aizat Mohd Abdah,Nur Hawa Nabilah Azman,Shalini Kulandaivalu,Yusran Sulaiman

doi:10.1038/s41598-019-53421-w

Muhammad Amirul Aizat Mohd Abdah, Nur Hawa Nabilah Azman + Show 2 more

Open Access

https://doi.org/10.1038/s41598-019-53421-w

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Journal: Scientific Reports	Publication Date: Nov 14, 2019
Citations: 28	License type: open-access

Affiliation: Universiti Putra Malaysia

Abstract

Asymmetric supercapacitors (ASC) have shown a great potential candidate for high-performance supercapacitor due to their wide operating potential which can remarkably enhance the capacitive behaviour. In present work, a novel positive electrode derived from functionalised carbon nanofibers/poly(3,4-ethylenedioxythiophene)/manganese oxide (f-CNFs/PEDOT/MnO2) was prepared using a multi-step route and activated carbon (AC) was fabricated as a negative electrode for ASC. A uniform distribution of PEDOT and MnO2 on f-CNFs as well as porous granular of AC are well-observed in FESEM. The assembled f-CNFs/PEDOT/MnO2//AC with an operating potential of 1.6 V can achieve a maximum specific capacitance of 537 F/g at a scan rate of 5 mV/s and good cycling stability (81.06% after cycling 8000 times). Furthermore, the as-prepared ASC exhibited reasonably high specific energy of 49.4 Wh/kg and low charge transfer resistance (Rct) of 2.27 Ω, thus, confirming f-CNFs/PEDOT/MnO2//AC as a promising electrode material for the future energy storage system.

Highlights

The gradual depletion of fossil fuels and the demand of energy consumption have shown a tremendous effort in developing alternative energy storage devices such as fuel cells, lithium-ion batteries (LIBs), conventional capacitors and supercapacitors has been devoted to overcoming these energy crises
We reported the asymmetric supercapacitor (ASC) design of functionalised-carbon nanofibers (CNFs)/PEDOT/MnO2 (f-CNFs/PEDOT/MnO2) composite and activated carbon (AC) as positive and negative electrodes, respectively
The f-CNFs/PEDOT/MnO2 has an average diameter of 390 ± 68 nm, which is slightly higher as compared with pure f-CNFs (354 ± 45 nm)[11]

Summary

Introduction

The gradual depletion of fossil fuels and the demand of energy consumption have shown a tremendous effort in developing alternative energy storage devices such as fuel cells, lithium-ion batteries (LIBs), conventional capacitors and supercapacitors has been devoted to overcoming these energy crises. The f-CNFs/PEDOT/MnO2 electrode was measured in the potential window of 0 to 1 V (vs Ag/AgCl) and displays a quasi-rectangular shape, indicating the combination of both EDLC and pseudocapacitance behaviour[35].

Results

Conclusion