One-step coaxial electrodeposition of Co0.85Se on CoNi2S4 nanotube arrays for flexible solid-state asymmetric supercapacitors

Chunyan Zhang; Mingzhen Hou; Xiaoyi Cai; Jianjian Lin; Xiang Liu; Ruirui Wang; Lijun Zhou; Jingchang Gao; Baosheng Li; Linfei Lai

doi:10.1039/C8TA05131C

One-step coaxial electrodeposition of Co_0.85Se on CoNi₂S₄ nanotube arrays for flexible solid-state asymmetric supercapacitors†

Chunyan Zhang,^a Mingzhen Hou,^a Xiaoyi Cai,^d Jianjian Lin,

^b Xiang Liu,^c Ruirui Wang,^a Lijun Zhou,^a Jingchang Gao,^a Baosheng Li^a and Linfei Lai

*^a

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* Corresponding authors

^a Key Laboratory of Flexible Electronics & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, 5 XinMofan Road, Nanjing 210009, China
E-mail: iamlflai@njtech.edu.cn

^b College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

^c College of Energy Science and Engineering, Nanjing Tech University, 30 Puzhu South Road, Nanjing 211816, China

^d School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nan-yang Link, Singapore 637371, Singapore

Abstract

A one-step electrochemical method is applied to coaxially deposit highly conductive Co_0.85Se nanosheets composed of ultrasmall Co_0.85Se nanocrystals on three-dimensional (3D) CoNi₂S₄ nanotube arrays supported on graphene foam (GF) (Co_0.85Se@ CoNi₂S₄/GF) as an electrode for flexible solid-state supercapacitors. The Co_0.85Se@CoNi₂S₄/GF electrode has an areal capacitance of 5.25 F cm⁻² at 1 mA cm⁻² and good rate capability (2.65 F cm⁻² at 20 mA cm⁻²). A solid-state asymmetric supercapacitor with Co_0.85Se@NiCo₂S₄/GF as the cathode and hollow carbon spheres (HCSs) as the anode in a PVA/KOH electrolyte was assembled which shows an energy density of 46.5 W h kg⁻¹ at a power density of 750 W kg⁻¹, and 89.0% capacity retention after 10 000 cycles over a potential window of up to 1.55 V. These results demonstrate that the electrodeposition method is applicable for engineering of 3D microstructured electrodes and also provides an efficient strategy for fabricating transition metal selenide based nanodevices.

Journal of Materials Chemistry A

One-step coaxial electrodeposition of Co_0.85Se on CoNi₂S₄ nanotube arrays for flexible solid-state asymmetric supercapacitors†

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One-step coaxial electrodeposition of Co_0.85Se on CoNi₂S₄ nanotube arrays for flexible solid-state asymmetric supercapacitors

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Journal of Materials Chemistry A