Minyawi Bashaer A, Vaseem Mohammad, Alhebshi Nuha A, Al-Amri Amal M, Shamim Atif
Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Integrated Microwave Packaging Antennas and Circuit Technology (IMPACT) Lab, Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Nanomaterials (Basel). 2023 Sep 16;13(18):2567. doi: 10.3390/nano13182567.
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) 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 electrodes, gold (Au) electrodes, and VO/Au electrodes using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The VO 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. The VO/Au electrode exhibits an areal capacitance of 16 mF cm, which is double that of the VO electrode. Due to the excellent electrical conductivity of gold, the areal capacitance 18 mF cm of the Au electrode is the highest among them. Based on that, Au positive electrodes and VO negative electrodes are used to build an asymmetric supercapacitor. The device delivers an areal energy density of 0.45 μWh cm at an areal power density of 70 μW cm 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.
印刷储能组件因可被整合到可弯曲电子产品中而备受关注。在本研究中，采用无毒溶剂通过水热法合成了一种基于二氧化钒（VO）的均匀稳定墨水。所合成材料的结构和形态特性被确定为结晶良好的单斜相纳米颗粒。使用循环伏安法、恒电流充放电和电化学阻抗谱对VO电极、金（Au）电极和VO/Au电极的电荷存储机制及性能进行了测定。VO电极在正负电压范围内均显示出双电层和氧化还原反应，其面电容略高，为9 mF/cm²。VO/Au电极的面电容为16 mF/cm²，是VO电极的两倍。由于金具有优异的导电性，Au电极的面电容为18 mF/cm²，是三者中最高的。基于此，使用Au正极和VO负极构建了一个不对称超级电容器。该器件在氢氧化钾水性电解质中，于1.4 V电压下，在70 μW/cm²的面功率密度下，面能量密度为0.45 μWh/cm²。我们为具有成本效益、轻质、环保的印刷超级电容器提供了一种有前景的电极候选材料。
