Hydrothermal synthesis and supercapacitor electrode of low crystallinity VOOH hollow spheres with pseudocapacitance in aqueous solution

作者：Zhang, Yifu^*; Jing, Xuyang

来源：Materials Letters, 2017, 205: 1-5.

DOI：10.1016/j.matlet.2017.06.044

• Nanoparticles
• Microstructure
• VOOH
• Electrical properties
• Energy storage and conversion

Vanadyl hydroxide (VOOH) may bear scientific importance and novel chemical and physical properties but they are uncommonly reported comparing with vanadium oxides. In the present study, lepidocrocite VOOH hollow spheres with low crystallinity were synthesized through a template-free hydrothermal route. Diameter of VOOH hollow spheres ranged from 300 nm to 500 nm, and VOOH shell thickness reached 20 nm on average. Electrochemical properties of VOOH hollow spheres as supercapacitor electrodes in aqueous electrolyte were developed and studied by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). Results revealed that VOOH hollow spheres featured capacitive behavior based on pseudocapacitance. Specific capacitance of 102 F center dot g (1) at current density of 0.2 A center dot g (1) was achieved. At current densities of 0.5, 1, 2.5 and 10 A center dot g (1), specific capacitances measured 87, 68, 56 and 29 F center dot g (1), respectively. Findings in present study proved that VOOH hollow spheres could be promising candidate as ideal material for supercapacitor electrodes.

• 出版日期2017-10-15
• 单位大连理工大学