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Front. Chem. | doi: 10.3389/fchem.2018.00555

A porous and conductive graphite nanonetwork forming on the surface of KCu7S4 for energy storage

 Shuge Dai1*, Weixia Shen1,  Junmin Xu1 and Zhuangfei Zhang1*
  • 1Zhengzhou University, China

A flexible all-solid-state supercapacitor is fabricated by building a layer of porous and conductive nanonetwork on the surface of KCu7S4 nanowires supported on the carbon fibre fabric, where the porous and conductive nanonetwork is assembled by graphite nanoparticles. This porous graphite layer plays a key role in providing ion diffusion channels to access the KCu7S4 through the pores for electrochemical reactions and forming electron transport pathways from the graphite network to the electronic collector of the carbon fiber fabric. This flexible supercapacitor exhibits excellent electrochemical performance with high specific capacitance of 408 F g-1 at a current density of 0.5 A g-1 and high energy density of 36 Wh kg-1 at a power density of 201 W kg-1. Moreover, it is cost-effective, easy to scale up and environmentally friendly with high flexibility. Our investigation demonstrates that such a porous and conductive nanonetwork could be used to improve the charge storage efficiency for a wide range of electrode materials.

Keywords: flexible, porous, graphite nanonetwork, KCu7S4 nanowires, supercapacitor

Received: 27 Sep 2018; Accepted: 29 Oct 2018.

Edited by:

Qiaobao Zhang, Xiamen University, China

Reviewed by:

Haibin Sun, Shandong University of Technology, China
Aibing Chen, Hebei University of Science and Technology, China
Shanglong Peng, Lanzhou University, China  

Copyright: © 2018 Dai, Shen, Xu and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence:
Prof. Shuge Dai, Zhengzhou University, Zhengzhou, China, shugedai@zzu.edu.cn
Dr. Zhuangfei Zhang, Zhengzhou University, Zhengzhou, China, zhangzf@zzu.edu.cn