UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, PO Box 392, Pretoria, South Africa; Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, PO Box 722, Somerset West, Western Cape Province, South Africa.
UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, PO Box 392, Pretoria, South Africa; Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, PO Box 722, Somerset West, Western Cape Province, South Africa; Department of Physics, College of Science, Engineering and Technology, University of South Africa, Private Bag X6, Florida 1710, Johannesburg, South Africa.
J Colloid Interface Sci. 2017 May 1;493:130-137. doi: 10.1016/j.jcis.2017.01.020. Epub 2017 Jan 7.
Silver nanoparticles (AgNPs) grown on a three dimensional (3d) graphene networks (GNs) has been successfully prepared by an efficient and rapid microwave-assisted growth process to form GNs/AgNPs nanocomposite electrode materials for supercapacitor application. The 3d nature of the used GNs offers a unique architecture, which creates an efficient conduction networks and maximum utilization of space and interface, and acts as a conductive layer for the deposited AgNPs. The electrochemical performances of the fabricated electrode were evaluated by cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) tests. Specifically, the optimal GNs/AgNPs nanocomposite exhibits remarkable performances with a high specific capacitance of 528Fg at a current density of 1Ag and excellent capacitance retention of ∼93% after 3000cycles. Moreover, this microwave-assisted growth strategy of AgNPs is simple and effective, which could be extended to the construction of other three dimensional graphene based metallic composites for energy storage and conversion applications.
通过一种高效快速的微波辅助生长工艺，成功制备了负载在三维（3D）石墨烯网络（GNs）上的银纳米粒子（AgNPs），形成了用于超级电容器应用的 GNs/AgNPs 纳米复合材料电极材料。所使用的 GNs 的 3D 特性提供了独特的架构，创造了高效的导电网路和最大的空间和界面利用率，并充当沉积的 AgNPs 的导电层。通过循环伏安法（CV）、恒电流充放电和电化学阻抗谱（EIS）测试评估了制备电极的电化学性能。具体而言，最佳的 GNs/AgNPs 纳米复合材料在电流密度为 1Ag 时表现出出色的性能，具有 528Fg 的高比电容，并且在 3000 次循环后电容保持率约为 93%。此外，这种 AgNPs 的微波辅助生长策略简单有效，可扩展到其他用于储能和转换应用的三维石墨烯基金属复合材料的构建。
