V-Mn-O aerogel composite-based high-energy Zn-ion hybrid supercapacitor. (April 2023)

• Record Type: Journal Article
• Authors: Ashraf, Iqra; Abbas, Qasim; Huang, Yaqin; Hassan, Najam Ul; Albaqami, Munirah D.; Tighezza, Ammar Mohamed; Eldin, Sayed M.; Javed, Muhammad Sufyan; Ahmad, Awais; Luque, Rafael
• Is Part Of: Journal of energy storage. Volume 60(2023)
• Publication Date: 2023-04
• Subjects: Zinc-ion supercapacitor -- V-doped MnO2 -- Aerogel structure -- Cathode material; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.106601
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Zinc-ion hybrid supercapacitors (ZIHCs) show great potential as advanced energy storage devices. Herein, we present vanadium (V)-doped manganese oxide aerogel structured (V-Mn-O) cathode material with expended interlayer space for ZIHCs. The V-doping expands the interlayer distance of MnO2 and creates more active sites with open channels for fast ionic diffusion, and offers good structural stability. The as-fabricated ZIHC (V-Mn-O//Zn) demonstrates a maximum specific capacitance of 333.35 F/g at 1 A/g with capacitance retention of 95.63 % after 10, 000 cycles with ∼98 % Coulombic efficiency. The V-Mn-O//Zn exhibits highly capacitive charge storage characteristics. Furthermore, the V-Mn-O//Zn delivers a maximum energy density of 150.12 Wh/kg at a power density of 900.72 W/kg and is superior to most of the previously reported values at similar conditions. This work presents an innovative approach for developing high-rate next-generation zinc-ion hybrid supercapacitors. Graphical abstract: The expended interlayer V-doped MnO2 aerogel-structured cathode material shows promising electrochemical performance with enhanced Zn 2+ diffusion for ZIHC (V-Mn-O//Zn) and delivers an ultra-high energy density of 150.12 Wh/kg at 900.72 W/kg. Unlabelled Image Highlights: Aerogel-structured V-doped MnO2 was synthesized by facile hydrothermal method. V-doping leads to expand the interlayer distance of the MnO2 and manipulate the electronic properties. The V-doped MnO2 exhibits good electrochemical properties with enhanced Zn 2+ diffusion. The assembled ZIHC (V-Mn-O//Zn) delivers an ultra-high energy density of 150.12 Wh/kg at 900.72 W/kg.