Abstract
A combined cyclic voltammetry and pulse reverse potential electrodeposition technique has been used to synthesize carbon-free Ni/NiO nanocomposite thin film supercapacitor electrode. The structural and morphological analyses have revealed the presence of crystalline phases of both Ni and NiO in the form of nanospheres of size ~50 nm. The electrochemical analysis of the Ni/NiOna nocomposite electrode has shown a remarkable performance by delivering a high specific capacitance of 2000 Fg−1 at an applied current load of 1 Ag−1 and a capacitance retention of 98.6%, after over 800 cycles under a high current load of 20 Ag−1.
Highlights
Supercapacitors (SCs) have received much attention as important energy storage devices in recent times as a result of their high-power densities and longer cycle life compared to batteries, and high energy densities compared to dielectric capacitors [1]
Based on their charge storage mechanism, SCs can be classified as electric double-layer capacitors (EDLCs) or pseudocapacitors (PCs)
We report a novel approach of electrodeposition technique that combines the modes of cyclic voltammetry (CV) and pulse reverse potential (PRP) to deposit a carbon-free conducting Ni/NiO nanocomposite thin film supercapacitor on a chemically inert conducting Ti- substrate
Summary
Supercapacitors (SCs) have received much attention as important energy storage devices in recent times as a result of their high-power densities and longer cycle life compared to batteries, and high energy densities compared to dielectric capacitors [1] Based on their charge storage mechanism, SCs can be classified as electric double-layer capacitors (EDLCs) or pseudocapacitors (PCs). PCs are known to provide higher specific capacitance and energy density than EDLCs due to the multiple oxidation states of their electroactive materials, which favour fast faradaic reactions [2,3,4]. Transition metal oxides such as NiO [1]. We report a novel approach of electrodeposition technique that combines the modes of cyclic voltammetry (CV) and pulse reverse potential (PRP) to deposit a carbon-free conducting Ni/NiO nanocomposite thin film supercapacitor on a chemically inert conducting Ti- substrate
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