Application of Ag Nanoparticles That Anchored on F-Graphene into NiO/Ni(OH)2 for Improvements in Storage Capacity and Energy Density: Nanotechnology Offers Higher Storage Ability

Abstract

AgNP is synthesized on the surface of F-graphene as anchored, and characterized to form less than 20 nm in size having quantized physical properties. Application of AgNP has been investigated its effects on NiO/Ni(OH)2 supercapacitor from the comparison of specific capacitance (F g-1) and capacity (mA h g-1). It shows to be beneficial to the energy and power density of NiONi(OH)2 with reversible AgNP multi redox reactions. The specific capacitance of NiONi(OH)2 is highly enhanced by applied AgNP anchored on F-graphene (AgNP/F-graphene) from 148 F g-1 to 356 F g-1 while it results in 226 F g-1 by applied silver without F-graphene. The best result is obtained with the nafion free electrode of AgNP/F-graphene/NiONi(OH)2, as it results in 1,153 F g-1 at the experimental condition of 5 mV/s scan rate in 1M KOH. For the specific capacity of NiO/Ni(OH)2, the identical result is observed as it improved from 266 mA h g-1 up to 545 mA h g-1 by applied AgNP anchored on F-graphene. The performance of AgNP combined NiONi(OH)2 leads us to explore the secondary battery of Zn-Ni that combined with Zn-Ag. A preliminary galvanic-charge/discharge test using a single cell of AgNP/F-graphene/NiONi(OH)2 coupled with Zn plate demonstrates to be a potential hybrid rechargeable battery having a high power and energy density, as it resulted in about 3,433 W kg-1 for the power density and 958 W h kg-1 for the energy density, respectively, on the basis of Ni and Silver as the active material.