High-performance VO2/CNT@PANI with core-shell construction enable printable in-planar symmetric supercapacitors

Cheng Chen; Shiwen Wei; Qiang Zhang; Huijun Yang; Jiaxin Xu; Liangzhe Chen; Xinghai Liu

doi:10.1016/j.jcis.2024.03.012

High-performance VO₂/CNT@PANI with core-shell construction enable printable in-planar symmetric supercapacitors

J Colloid Interface Sci. 2024 Jun 15:664:53-62. doi: 10.1016/j.jcis.2024.03.012. Epub 2024 Mar 4.

Authors

Cheng Chen¹, Shiwen Wei², Qiang Zhang², Huijun Yang¹, Jiaxin Xu¹, Liangzhe Chen³, Xinghai Liu⁴

Affiliations

¹ Electronic Information School, Wuhan University, Wuhan 480032, China.
² School of Electronic Information Engineering, Jingchu University of Technology, Jingmen 448000, China.
³ School of Electronic Information Engineering, Jingchu University of Technology, Jingmen 448000, China. Electronic address: chen_lz1991@jcut.edu.cn.
⁴ Electronic Information School, Wuhan University, Wuhan 480032, China. Electronic address: liuxh@whu.edu.cn.

PMID: 38458055
DOI: 10.1016/j.jcis.2024.03.012

Abstract

As a progressive electronic energy storage device, the flexible supercapacitor holds tremendous promise for powering wearable/portable electronic products. Of various pseudocapacitor materials, vanadium dioxide (VO₂) has garnered extensive attention due to its impressive theoretical capacitance. However, the challenges of inferior cycling life and lower energy density to be addressed. Herein, we prepare VO₂ nanorods with winding carbon nanotubes (CNT) via a facile solvothermal route, followed by in situ polymerization of polyaniline (PANI) shell. Taking full advantage of the synergistic effect, the VO₂/CNT@PANI composite delivers a high specific capacitance of 354.2F/g at 0.5 A/g and a long cycling life of ∼ 88.2 % over 5000 cycles resulting from the enhanced conductivity of CNT and stabilization of PANI shell. By screen printing the formulated inks with outstanding rheological behaviours, we manufacture an in-planar VO₂/CNT@PANI symmetric supercapacitor (VO₂/CNT@PANI SSC) device featuring an orderly arrangement structure. This device yields a remarkable areal energy density of 99.57 μWh/cm² at a power density of 387.5 μW/cm² while retaining approximately ∼ 87.6 % of its initial capacitance after prolonged use. Furthermore, we successfully powered a portable game machine for more than 2 min using two SSCs connected in series with ease. Therefore, this work presents a universal strategy that utilises combination and coating to boost electrochemical performance for flexible high-performance supercapacitors.

Keywords: Core-shell structure; In-planar supercapacitor; Screen printing; VO(2)/CNT@PANI.