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首页> 外文期刊>International Journal of Electrochemical Science >Application of 3DG/CB/MnO2 Electrode Material in Supercapacitors
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Application of 3DG/CB/MnO2 Electrode Material in Supercapacitors

机译：3DG / CB / MnO 2 电极材料在超级电容器中的应用

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摘要

Using a three-dimensional graphene (3DG) prepared by a sol-gel method as skeleton material, andadding commercial carbon black as conductive additive, a novel composite electrode material(3DG/CB/MnO2) is synthesized by hydrothermal method. The 3DG and 3DG/CB/MnO2 composite arecharacterized by SEM and XRD. The SEM results indicate that the thickness of graphene sheets ishomogeneous, and the MnO2 nanoparticles are successfully deposited on the surface of the 3DG andcarbon black to form a honeycomb structure, in which numerous pores are constructed by the graphenesheets and carbon nanotubes (CNTs). The XRD result shows that the state of the MnO2 in the3DG/CB/MnO2 composite is -MnO2. The electrochemical test results display that the specificcapacitances are 590, 433 and 247 F/g respectively at the current densities of 0.3, 1 and 3 A/g.Whereas, the specific capacitances of the MnO2 nanoparticles at 0.3 A/g is only 433 F/g. After the3DG/CB/MnO2 composite is charge-discharge for 5000 cycles at the big current densities of 30 A/g,its specific capacitance decreases to 38 F/g from 55 F/g. The capacitance retention of the3DG/CB/MnO2 composite reaches to 70%, implying this composite is a supercapacitor electrodematerial which has the prospect of industrialization.
机译：以溶胶-凝胶法制备的三维石墨烯（3DG）为骨架材料，并添加市售炭黑作为导电添加剂，通过水热法合成了新型复合电极材料（3DG / CB / MnO2）。通过SEM和XRD对3DG和3DG / CB / MnO2复合材料进行表征。 SEM结果表明，石墨烯片的厚度均匀，并且MnO2纳米颗粒成功沉积在3DG和炭黑的表面形成蜂窝结构，其中石墨烯片和碳纳米管（CNT）构成许多孔。 XRD结果表明，3DG / CB / MnO2复合物中MnO2的状态为-MnO2。电化学测试结果表明，在电流密度分别为0.3、1和3 A / g时，比电容分别为590、433和247 F / g，而MnO2纳米颗粒在0.3 A / g时的比电容仅为433 F. /G。 3DG / CB / MnO2复合材料在30 A / g的大电流密度下充放电5000次后，其比电容从55 F / g降至38 F / g。 3DG / CB / MnO2复合材料的电容保持率达到70％，表明该复合材料是一种具有工业化前景的超级电容器电极材料。

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