Ruthenium oxide / carbon composite electrodes for the application of electrochemical

• Main Authors: Chen-Ching Wang, 王振慶
• Other Authors: Chi-Chang Hu
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/59136048573357969873

碩士 === 國立中正大學 === 化學工程研究所 === 90 === The purpose of this paper is to develop C-Ru composites for electrochemical supercapacitors using the impregnation and electroless deposition. These methods easily provide the uniform deposits of desired metals on the surface of carbon substrates. The electrochemical properties and redox behaviour of these hybrid Ru oxide-carbon composites were systematically investigated in 0.1 M H2SO4 by cyclic voltammetry (CV) and chronopotentiometry (CP). The effects of anodizing in H2SO4, annealing in air and oxidizing in NaOH on the capacitive performance have been studied extensively. When the Ru-C composites were annealed in air for 8 hr at 240℃, they would be more stable and exhibited the responses similar to that of ideal electrochemical capacitors. In the first part, a maximum utilization of Ru ( ie, 1000F/g base on active material only) was obtained when the Ru-C composite was annealed in air at 240℃ and anodized at 1.2V for 1.5 hours. In the second part, the maximum utilization of Ru-C electrode was obtained when these composites were heated at 85℃ and place in 0.1M NaOH for 0.5 hr. The textural characterizstics of the composites are systematically investigated in this thesis. Although the Brunauer-Emmett-Teller surface area of the activate carbon was deceased with the loading of ruthenium oxide, the specific capacitance of these composites increases. The crystalline information of the Ru-C composite with annealing at different temperatures was characterized from the X-ray diffraction (XRD) patterns. The morphologies of Ru oxide–C electrode were examined by a scanning electron microscope (SEM). The effect of annealing temperatures on the oxidation state of Ru within the Ru-C composite was stuied by X-ray photoelectron spectroscopy (XPS).