Nickel Cobaltite Functionalized Silver Doped Carbon Xerogels as E cient Electrode Materials for High Performance Symmetric Supercapacitor Wasfey, Madlin A. Carrasco Marín, Francisco Pérez Cadenas, Agustín Francisco Supercapacitors Carbon xerogels Silver nanoparticles Nickel cobaltite Hybrid electrode materials Porous structure 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. 2021-01-20T07:25:30Z 2021-01-20T07:25:30Z 2020-10-31 info:eu-repo/semantics/article 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] http://hdl.handle.net/10481/65562 10.3390/ma13214906 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Mdpi