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- W4297200469 abstract "• Graphene/Co(OH) 2 /Ni electrode was synthesized by two-step electrodeposition. • Specific capacity of graphene/Co(OH) 2 /Ni electrode is 177 μAh cm −2 at 2 mA cm −2 . • Hybrid MSC manifests remarkable energy density and excellent flexibility. A nanocomposite of graphene, cobalt hydroxide and nickel can conveniently be synthesized on gold-silver alloy lines. Using a two-step electrodeposition method, the scaly morphology is pre-deposited on a Ni film, followed by the interconnecting corrugated graphene/cobalt hydroxide composite nanomaterial. Due to the pre-deposited Ni film, the area capacity of the graphene/cobalt hydroxide/Ni electrode is 1.6-times of the graphene/cobalt hydroxide electrode. The kinetic analysis of the graphene/cobalt hydroxide/Ni electrode displays diffusion and non-diffusion contributions of 38% and 62% at 10 mV s −1 , respectively. X-ray photoelectron spectroscopy exhibits the oxidation of Co 2+ to Co 3+ dedicated to the OH - ion insertion. Furthermore, graphene/cobalt hydroxide/Ni//activated carbon flexible micro-supercapacitor (MSC) was assembled by gel KOH-PVA electrolyte, graphene/cobalt hydroxide/Ni (positive electrode), and activated carbon (negative electrode), which manifests maximum volumetric energy of 18.6 mWh cm −3 . Moreover, MSC retains over 94% capacitance after 10,000 cycles. After 1,000 continuous bending/unbending cycles at a 180° bending angle with the frequency of 100 mHz, the capacitance retention of MSC is still maintained at 97% of the initial value. The results show outstanding flexibility and mechanical stability of MSC based on graphene/cobalt hydroxide/Ni electrode and confirm that further chemical and physical optimization may lead to the development of quasi-solid-state hybrid MSCs." @default.
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- W4297200469 date "2022-11-01" @default.
- W4297200469 modified "2023-09-27" @default.
- W4297200469 title "Ni film decorated on Au-Ag alloy line to enhance graphene/cobalt hydroxide electrodes for micro-supercapacitors" @default.
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- W4297200469 doi "https://doi.org/10.1016/j.electacta.2022.141247" @default.
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