Thermal Decomposition and Capacitive Properties of Carboxyl Ruthenium Oxide Thin Film

Abstract

Carboxyl ruthenium oxide [RuO _δ (OOCCH ₃ ) _λ ·nH ₂ O] thin film has been prepared by in-situ decomposition using RuCl ₃ ·3H ₂ O isopropanol solution as precursor. Thermal decomposition and capacitive properties of the film have been investigated by Fourier transformation infrared spectroscopy, X-ray diffraction and electrochemical analyzer, respectively. Our results showed that RuO _δ (OOCCH ₃ ) _λ ·nH ₂ O thin film generated from RuCl ₃ ·3H ₂ O isopropanol solution below 300°C, and transformed into crystal RuO ₂ at 400°C. Carboxyl played an important role on attenuation of specific capacitance of the film. Specific capacitance of the film reached 859 F g⁻¹ and maintained at 99.7% of its original value after first two 8000 charge-discharge cycleswhen heat treated at 300 ^o C for 2 h.

Keywords:

• capacitive properties
• carboxyl ruthenium oxide
• in-situ decomposition
• thin film

This work was supported by National Programs for High Technology Research and Development (No. 2007AA03Z240). H. L acknowledges a Ph. D. fellowship of Central South University from 2006–2009.