Journal
ELECTROCHIMICA ACTA
Volume 264, Issue -, Pages 46-52Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.01.069
Keywords
MnO2; PEDOT; Ni nanotubes; Supercapacitors
Categories
Funding
- National Natural Science Foundation of China [21576056, 21576057]
- Guangdong Natural Science Foundation [2017A030311016]
- Science and Technology Research Project of Guangdong Province [2016A010103043]
- Featured Innovation Project of Guangdong University [2016KTSCX107]
- Science and Technology Research Project of Guangzhou [201607010232, 201607010198]
- Guangzhou University's Training Program for Young Top-Notch Personnel [BJ201704]
- CAST High School Elite Program
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As an attractive supercapacitor material, MnO2 greatly suffers poor conductivity and unsatisfied stability. In this work, double-shelled poly(3,4-ethylenedioxythiophene) (PEDOT) and MnO2 decorated Ni nanotube arrays (NTAs) are successfully synthesized by a simple electrodeposition strategy, endowing the hybrid with remarkably improved conductivity and prolonged durability. As a self-supported electrode, the resulting PEDOT@MnO2@NiNTAs exhibits outstanding electrochemical properties, including high mass capacitance (based on MnO2 mass, 442.85 F g(-1) at 2.5 A g(-1)) and excellent cycling stability (80.37% capacitance retention after 15000 cycles). Furthermore, when assembling an asymmetric supercapacitor with the PEDOT@MnO2@NiNTAs and activated carbon (AC), the device affords a voltage window up to 1.7 V and delivers a large volumetric capacitance (1.47 F cm(-3) at 4 mA cm(-3)) and high energy density (0.59 mWh cm(-3) at power density of 84.96 mW cm(-3)), indicating its great potential in practical supercapacitor applications. (c) 2018 Elsevier Ltd. All rights reserved.
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