Electrochemical capacitive behavior of RuO2/graphene composites prepared under various precipitation conditions
Electrochemical capacitive behavior of RuO2/graphene composites prepared under various precipitation conditions
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不同沉淀条件下制备的RuO2/石墨烯复合材料的电化学电容行为
DOI：
10.1016/j.jallcom.2015.09.077
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发表时间：
2015-12
影响因子：
6.2
通讯作者：
Hanwei He
中科院分区：
文献类型：
--
作者：
Xian Leng;Jianpeng Zou;Xiang Xiong;Hanwei He
以氧化石墨烯和含水氯化钌为原料，以碳酸铵、尿素和水合钠为沉淀剂，在不同的沉淀条件下，通过水热反应制备了RuO2/石墨烯复合材料。采用SEM、TEM、XRD等手段对氧化钌/石墨烯复合材料的形貌和结构进行了表征。采用循环伏安法、恒流充放电法和阻抗法对其电化学性能进行了测试。结果表明，水合钠沉淀法制备的薄膜状RuO2/石墨烯复合材料的电容性能优于碳酸铵和尿素沉淀法制备的颗粒状RuO2/石墨烯复合材料。在以CO(NH2)2为沉淀剂的RuO2/石墨烯复合材料中，Ru3+发生歧化反应生成Ru和RuO2。以水合钠为沉淀剂的RuO2/石墨烯复合材料表现出最佳的电化学性能，比电容为528.5 F g−1at 0.1 A g−1，电阻最小（0.4 Ω），速率性能和循环稳定性优异，表明Ru(OH)δCl3−δ前驱体与氧化石墨烯在水热过程中具有协同作用。
Using graphene oxide and hydrous ruthenium chloride as starting materials, RuO2/graphene composites were prepared via a hydrothermal reaction under different precipitation conditions by using ammonium carbonate, urea, and sodium hydrate as precipitants. The morphology and structure of the RuO2/graphene composites were characterized by SEM, TEM, XRD. Cyclic voltammetry, galvanostatic charge–discharge, and impedance measurements were carried out to test the electrochemical performance. The results revealed that the veil-like RuO2/graphene composite prepared by sodium hydrate precipitation showed better capacitance performance than a particle-like composite prepared by ammonium carbonate and urea precipitation. A disproportionation reaction from Ru3+to Ru and RuO2took place in the RuO2/graphene composite when using CO(NH2)2as the precipitant. The RuO2/graphene composite using sodium hydrate as the precipitant exhibited the optimum electrochemical performance with superior specific capacitance of 528.5 F g−1at 0.1 A g−1, minimum resistance (0.4 Ω), and excellent rate performance and cycling stability, suggesting the synergetic effects of the Ru(OH)δCl3−δprecursors and graphene oxide during the hydrothermal process.
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影响因子：
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作者：
Zhou, Jisheng;Song, Huaihe;Ma, Lulu;Chen, Xiaohong
通讯作者：
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影响因子：
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