氧化钌
超级电容器
石墨烯
材料科学
电容
钌
氧化物
碳纤维
碳纳米管
化学工程
纳米技术
无机化学
电极
化学
催化作用
复合材料
有机化学
复合数
冶金
物理化学
工程类
作者
Pengfei Wang,Hui Liu,Xu Yang,Yunfa Chen,Jun Yang,Qiangqiang Tan
标识
DOI:10.1016/j.electacta.2016.02.089
摘要
Reducing the particle size is a straightforward way to increase the specific surface area of ruthenium oxide, which usually translates to the high specific capacitance for a supercapacitor. Herein, we report a facile strategy to fabricate ultrafine ruthenium oxides supported on various carbon-based substrates (carbon powders, carbon nanotubes, or reduced graphene oxides) as excellent electrode materials for a supercapacitor. The novelty of this work lies in its synthetic approach, which involves an aqueous synthesis of ruthenium nanoclusters under the control of pH value, and an air oxidation-based conversion process. In particular, owing to their ultrafine particle size, the as-prepared carbon-, carbon nanotube-, or reduced graphene oxide-supported ruthenium oxides exhibit specific capacitance as high as 879.1 F g−1, 966.8 F g−1 and 1099.6 F g−1, respectively, for a supercapacitor at a current density of 0.5 A g−1. The specific capacitance maintains 98.4% (for carbon supports), 98.0% (for carbon nanotube supports) and 98.4% (for reduced graphene oxide supports) at current density of 1 A g−1 with good cycling stability. The remarkable simplicity and environmental friendliness of this synthesis may provide a liable quantity production route to produce ruthenium oxides as highly efficient electrode materials for a supercapacitor.
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