Nickel Cobaltite Functionalized Silver Doped Carbon Xerogels as E cient Electrode Materials for High Performance Symmetric Supercapacitor
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SupercapacitorsCarbon xerogelsSilver nanoparticlesNickel cobaltiteHybrid electrode materialsPorous structure
A Wasfey, M., Abdelwahab, A., Carrasco-Marín, F., Pérez-Cadenas, A. F., H Abdullah, H., S Yahia, I., & Farghali, A. A. (2020). Nickel Cobaltite Functionalized Silver Doped Carbon Xerogels as Efficient Electrode Materials for High Performance Symmetric Supercapacitor. Materials, 13(21), 4906. [doi:10.3390/ma13214906]
SponsorshipDeanship of Scientific Research at King Khalid University R.G.P.2/39/40
Introducing new inexpensive materials for supercapacitors application with high energy density and stability, is the current research challenge. In this work, Silver doped carbon xerogels have been synthesized via a simple sol-gel method. The silver doped carbon xerogels are further surface functionalized with di erent loadings of nickel cobaltite (1 wt.%, 5 wt.%, and 10 wt.%) using a facile impregnation process. The morphology and textural properties of the obtained composites are characterized by X-ray di raction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen physisorption analysis. The silver doped carbon xerogels display a higher surface area and larger mesopore volume compared to the un-doped carbon xerogels and hierarchically porous structure is obtained for all materials. The hybrid composites have been utilized as electrode materials for symmetric supercapacitors in 6 M KOH electrolyte. Among all the hybrid composites, silver doped carbon xerogel functionalized with 1 wt.% nickel cobaltite (NiCo1/Ag-CX) shows the best supercapacitor performance: high specific capacitance (368 F g(-1) at 0.1 A g(-1)), low equivalent series resistance (1.9 W), high rate capability (99% capacitance retention after 2000 cycles at 1 A g(-1)), and high energy and power densities (50 Wh/Kg, 200 W/Kg at 0.1 A g(-1)). It is found that the specific capacitance does not only depend on surface area, but also on others factors such as particle size, uniform particle distribution, micro-mesoporous structure, which contribute to abundant active sites and fast charge, and ion transfer rates between the electrolyte and the active sites.