Printed Electrodes Based on Vanadium Dioxide and Gold Nanoparticles for Asymmetric Supercapacitors

oleh: Bashaer A. Minyawi, Mohammad Vaseem, Nuha A. Alhebshi, Amal M. Al-Amri, Atif Shamim

Format: Article
Diterbitkan: MDPI AG 2023-09-01

Deskripsi

Printed energy storage components attracted attention for being incorporated into bendable electronics. In this research, a homogeneous and stable ink based on vanadium dioxide (VO<sub>2</sub>) is hydrothermally synthesized with a non-toxic solvent. The structural and morphological properties of the synthesized material are determined to be well-crystalline monoclinic-phase nanoparticles. The charge storage mechanisms and evaluations are specified for VO<sub>2</sub> electrodes, gold (Au) electrodes, and VO<sub>2</sub>/Au electrodes using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The VO<sub>2</sub> electrode shows an electrical double layer and a redox reaction in the positive and negative voltage ranges with a slightly higher areal capacitance of 9 mF cm<sup>−2</sup>. The VO<sub>2</sub>/Au electrode exhibits an areal capacitance of 16 mF cm<sup>−2</sup>, which is double that of the VO<sub>2</sub> electrode. Due to the excellent electrical conductivity of gold, the areal capacitance 18 mF cm<sup>−2</sup> of the Au electrode is the highest among them. Based on that, Au positive electrodes and VO<sub>2</sub> negative electrodes are used to build an asymmetric supercapacitor. The device delivers an areal energy density of 0.45 μWh cm<sup>−2</sup> at an areal power density of 70 μW cm<sup>−2</sup> at 1.4 V in the aqueous electrolyte of potassium hydroxide. We provide a promising electrode candidate for cost-effective, lightweight, environmentally friendly printed supercapacitors.