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Hydrous Ruthenium Oxide with High Rate Pseudo-Capacitance Prepared by a New Sol-Gel Process
Xiao-feng Wang*,Zheng You,Dian-bo Ruan
Author NameAffiliationE-mail
Xiao-feng Wang* Department of Precision Instruments and Mechanics Tsinghua University, Beijing 100084, China xfw@mail.tsinghua.edu.cn 
Zheng You Department of Precision Instruments and Mechanics Tsinghua University, Beijing 100084, China  
Dian-bo Ruan Department of Precision Instruments and Mechanics Tsinghua University, Beijing 100084, China  
Abstract:
A kind of ruthenium oxide with smaller particles and higher porosity was prepared by a sol-gel process with RuCl3·xH2O and NaHCO3 solution. Several details concerning this new material, including crystal structure,particle size as functions of the temperature, and electrochemical properties were also reported. The optimal annealing temperature was 210 ℃ and the powder annealed at this temperature had a rate capacitance of 541 F/g. In addition, the rate capacitance of the composite electrode reached 802 F/g after 10% carbon black was added, much higher than any previously reported value. High energy density supercapacitors were built with the newly discovered electrode material. Energy densities as high as 67 J/g were obtained based on the RuO2 ·xH2O alone. By introducing the highly porous carbon black into the electrode, energy densities great than 100 J/g could be achieved. The power density of the capacitor was enhanced significantly.
Key words:  Supercapacitor, Ruthenium oxide, Pseudo-capacitance, Sol-gel growth, Carbon black
FundProject:
溶胶凝胶方法制备纳米氧化钌的超电容特性
王晓峰*,尤政,阮殿波
摘要:
采用溶胶凝胶方法制备了具有纳米尺度和多孔特征的氧化钌超电容器活性材料,探讨了烧结温度对电极材料的晶体结构,颗粒大小及电化学特性的影响.结合热失重分析、扫描电镜、循环伏安测试等方法探讨了溶胶凝胶法制备钌产物的组成及在高温条件下发生的分解过程和相应产物.钌氧化物材料经过210 ℃烧结处理后具有541 F/g的电化学容量,由其组成的超电容器具有67 J/g的能量密度.采用高导电乙炔黑作为载体制备了氧化钌/乙炔黑复合电极材料,当乙炔黑含量为10%时,电极材料的比容量达到802 F/g,采用该电极材料组成的电化学电容器具有100 J/g的能量密度且表现了良好的高功率放电特性.
关键词:  超电容器,氧化钌,准电容,溶胶凝胶法,乙炔黑
DOI:10.1360/cjcp2006.19(4).341.6
分类号: