Rational synthesis of MnO2/conducting polypyrrole@carbon nanofiber triaxial nano-cables for high-performance supercapacitors

Jian-Gan Wang; Ying Yang; Zheng-Hong Huang; Feiyu Kang

doi:10.1039/C2JM33364C

Rational synthesis of MnO₂/conducting polypyrrole@carbon nanofiber triaxial nano-cables for high-performance supercapacitors†

Jian-Gan Wang,^ab Ying Yang,^cd Zheng-Hong Huang^b and Feiyu Kang*^ab

* Corresponding authors

^a Institute of Advanced Materials Research, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
E-mail: fykang@tsinghua.edu.cn
Fax: +86-10-6279-2911
Tel: +86-10-6279-2911

^b State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

^c Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

^d State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Tsinghua University, Beijing 100084, China

Abstract

This study presents a rational synthesis of hierarchical MnO₂/conducting polypyrrole (PPy)@carbon nanofiber (CNF) triaxial nano-cables via in situ interfacial redox reaction. Uniform MnO₂/PPy multifunctional nanocoatings (∼20 nm) are formed on individual electrospun CNFs, constructing a one-dimensional triaxial configuration. The unique architecture enables a maximum value of the MnO₂/PPy pseudocapacitance and a strong synergetic effect of each component. The specific capacitance of the ternary nanocomposite as a freestanding electrode reaches as high as 705 F g⁻¹ at 2 mV s⁻¹. The three-dimensional porous electrode facilitates a large mass loading of active materials up to 2.0 mg cm⁻², which leads to a high areal capacitance of 1.4 F cm⁻². The improved electrical conductivity and strong structural integrity of the nanocomposite also endow the electrodes with good rate capability and long-term cycling stability. The superior electrochemical performance indicates that this method is an effective strategy for developing multifunctional nanocomposite electrodes for energy storage devices.

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Article information

DOI: https://doi.org/10.1039/C2JM33364C
Article type: Paper
Submitted: 25 May 2012
Accepted: 27 Jun 2012
First published: 27 Jun 2012

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J. Mater. Chem., 2012,22, 16943-16949

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Rational synthesis of MnO₂/conducting polypyrrole@carbon nanofiber triaxial nano-cables for high-performance supercapacitors

J. Wang, Y. Yang, Z. Huang and F. Kang, J. Mater. Chem., 2012, 22, 16943 DOI: 10.1039/C2JM33364C

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