A new potassium dual-ion hybrid supercapacitor based on battery-type Ni(OH)2 nanotube arrays and pseudocapacitor-type V2O5-anchored carbon nanotubes electrodes

Chenglong Shi; Junlong Sun; Youyong Pang; YongPing Liu; Bin Huang; Bo-Tian Liu

doi:10.1016/j.jcis.2021.09.011

A new potassium dual-ion hybrid supercapacitor based on battery-type Ni(OH)₂ nanotube arrays and pseudocapacitor-type V₂O₅-anchored carbon nanotubes electrodes

J Colloid Interface Sci. 2022 Feb;607(Pt 1):462-469. doi: 10.1016/j.jcis.2021.09.011. Epub 2021 Sep 4.

Authors

Chenglong Shi¹, Junlong Sun¹, Youyong Pang¹, YongPing Liu¹, Bin Huang¹, Bo-Tian Liu²

Affiliations

¹ Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Biological Engineering, Guilin University of Technology, Guilin 541004, China.
² Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Biological Engineering, Guilin University of Technology, Guilin 541004, China; Guangdong Institute of Semiconductor Industrial Technology, Guangdong Academy of Science, Guangzhou 510650, China. Electronic address: btliu2018@glut.edu.cn.

PMID: 34509728
DOI: 10.1016/j.jcis.2021.09.011

Abstract

Hybrid supercapacitors (HSCs) with the characteristics of high energy density, long cycle life and without altering their power density need to be developed urgently. Herein, a novel dual-ion hybrid supercapacitors (DHSCs) with Ni(OH)₂ nanotube arrays (NTAs) as positive electrode and V₂O₅ directly grown on freestanding carbon nanotubes (CNTs) as negative electrode is assembled. In charging mechanism of DHSCs, K⁺ are inserted into the V₂O₅ negative while OH^- react with Ni(OH)₂ positive; during discharge, the K⁺ and OH^- are released from V₂O₅ negative and Ni(OH)₂ positive, respectively, and return back to the electrolyte, which is quite different from traditional metal ion or alkaline supercapacitors. Because of the merits combining dual-ion mechanism and HSCs, the DHSC displays excellent capacity retention of ∼ 81.4% after 10,000 cycles, high energy density of ∼ 25.4 μWh cm^-2 and high power density of ∼ 4.66 mW cm^-2, indicating the potential applications in the further on flexible wearable electronics.

Keywords: Aqueous potassium ion capacitor; Dual-ion storage; Hybrid supercapacitors; Ultralong life; Wearable electronics.