Supercapacitor Electrode Materials of Nanostructured Hydrous Ruthenium Oxide Deposited by Cyclic Voltammetry Method

作者：Wang Jie^*; Xu Youlong; Ma Jianhua; Zhang Xuanhong; Meng Linbin; Shi Hongfu; Jiang Chunqiang; Peng Dan

来源：Rare Metal Materials and Engineering, 2012, 41(8): 1467-1471.

• hydrous ruthenium oxides
• supercapacitors
• electrochemical
• cyclic voltammetry

Nanostructured hydrous ruthenium oxide (RuO2 center dot xH(2)O) was directly deposited on tantalum (Ta) substrates by cyclic voltammetry (CV) technology in RuCl3 center dot xH(2)O aqueous solutions. The growth mechanism, revealed by energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) techniques, is that Ru3+ ions are reduced to nanostructured ruthenium (Ru) particles during negative potential scanning, then are oxidized to RuO2 center dot xH(2)O granules (also in nanometers) during the following positive scanning. The unique nanometer structure of RuO2 center dot xH(2)O, rather than the conventional "mud-cracked" structure, enable itself a high specific capacitance of 730 F.g(-1) at a scanning rate of 50 mV.s(-1) and a very fast charging/discharging ability. The specific capacitance is still up to 700 F.g(-1) when the oxide loading is up to 1.2 mg.cm(-2). In addition, the capacitance retains about 100% after 100,000 charging/discharging cycles. All of these indicate that the nanosized RuO2 center dot xH(2)O is an excellent electrode material for energy storage and conversion devices, such as supercapacitors.

• 出版日期2012-8
• 单位西安交通大学