Open Access

ARTICLE

Preparation of Eco-Friendly High-Performance Manganese Dioxide Supercapacitors by Linear Sweep Voltammetry

Junshan Zhao^1,#, Yihan Shi^1,#, Ming Zhang¹, Liu Zhang¹, Xumei Cui¹, Xinghua Zhu², Jitong Su¹, Dandan Jing¹, Dingyu Yang^1,*

1 College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu, 610225, China
2 College of Intelligent Manufacturing, Sichuan University of Arts and Science, Dazhou, 635000, China

* Corresponding Author: Dingyu Yang. Email:
# These authors contributed equally to this work

(This article belongs to the Special Issue: Renewable and Green Materials for Supercapacitors)

Journal of Renewable Materials 2023, 11(1), 79-91. https://doi.org/10.32604/jrm.2023.022030

Received 18 February 2022; Accepted 13 April 2022; Issue published 10 August 2022

Abstract

In this paper, the non-polluting, non-toxic, and eco-friendly material-MnO₂ electrodes were deposited on three-dimensional porous nickel (Ni) foam by linear sweep voltammetry, and the entire electrodeposition process did not require sintering of the material, which was fast and convenient while avoiding unnecessary energy consumption and thus was environmentally friendly. Scanning electron microscopy (SEM) and transmission electron microscopy were used to examine the surface and microscopic characteristics of each sample (TEM). Chronoamperometry (CA), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) were then used to determine the electrochemical characteristics of the manufactured samples. The result suggests that the MnO₂-sv80 electrode sample at a scan rate of 80 mV/s⁻¹ has excellent performance for the supercapacitor electrode. The specific capacitance was as high as 531.4 F g⁻¹ at a current density of 1 A g⁻¹ and remained at 223.2 F g⁻¹ at an ultra-high current density of 20 A g⁻¹, with capacitance retention of 42%.

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Keywords

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