Temperature-dependent textural and electrochemical properties of a ruthenium oxide capacitor prepared by exchange membrane controlled ion diffusion

详细信息    查看全文

• 作者：Xiaoting Hao ; Jiangshan Zhao ; Qiang Zhang ; ^{zhangqiang6299@bit.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Electrochemical capacitors ; Ruthenium oxide nanoparticles ; Ion diffusion methods ; Ion exchange membrane
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 May 2016
• 年：2016
• 卷：42
• 期：7
• 页码：9170-9177
• 全文大小：2017 K

文摘

A novel inorganic synthesis method i.e. ion diffusion controlled by ion exchange membrane was used for synthesizing RuO₂·nH₂O nanomaterials at room temperature without any template or organic surfactant. The annealing temperature changes of the structure of RuO₂·nH₂O nanoparticles resulted in different electrochemical performance. The morphology and nanostructure of pristine and annealed RuO₂·nH₂O at different temperatures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric-differential analysis (TG-DTA) and X-ray photoelectron spectroscopy (XPS). The results show that amorphous RuO₂·nH₂O prepared by the ion diffusion method transforms into crystalline one, the grain size becoming larger and the specific area decreasing with the increasing annealing temperature. The results of cyclic voltammetry, galvanostatic charge–discharge and impedance spectroscopy show that an appropriate annealing temperature is vital to obtain RuO₂·nH₂O nanoparticles with suitable electrochemical behavior. RuO₂·nH₂O annealed at ca. 150 °C exhibits a maximum specific capacitance of 673.37 F/g in 1.0 M H₂SO₄ electrolyte at a scan rate of 2 mV/s.