Vertically Aligned Co9 S8 Nanotube Arrays onto Graphene Papers as High-Performance Flexible Electrodes for Supercapacitors

Dongbin Xiong; Xifei Li; Zhimin Bai; Jianwei Li; Yan Han; Dejun Li

doi:10.1002/chem.201704239

Vertically Aligned Co₉ S₈ Nanotube Arrays onto Graphene Papers as High-Performance Flexible Electrodes for Supercapacitors

Chemistry. 2018 Feb 16;24(10):2339-2343. doi: 10.1002/chem.201704239. Epub 2017 Nov 7.

Authors

Dongbin Xiong^{1

2

3}, Xifei Li^{2

3

4}, Zhimin Bai¹, Jianwei Li², Yan Han², Dejun Li²

Affiliations

¹ Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, P.R. China.
² Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials, College of Physics and Materials Science, Tianjin Normal University, Tianjin, 300387, P.R. China.
³ Institute of Advanced Clean Energy, Xi'an University of Technology, Xi'an, 710048, P.R. China.
⁴ Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University, Tianjin, 300071, P.R. China.

PMID: 29030955
DOI: 10.1002/chem.201704239

Abstract

Paper-like electrodes are emerging as a new category of advanced electrodes for flexible supercapacitors (SCs). Graphene, a promising two-dimensional material with high conductivity, can be easily processed into papers. Here, we report a rational design of flexible architecture with Co₉ S₈ nanotube arrays (NAs) grown onto graphene paper (GP) via a facile two-step hydrothermal method. When employed as flexible free-standing electrode for SCs, the proposed architectured Co₉ S₈ /GPs exhibits superior electrochemical performance with ultrahigh capacitance and outstanding rate capability (469 F g^-1 at 10 A g^-1 ). These results demonstrate that the new nanostructured Co₉ S₈ /GPs can be potentially applied in high performance flexible supercapacitors.

Keywords: Co9S8; Graphene papers; Nanotube arrays; Supercapacitors; Three-dimensional configuration.