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Al-Othman, Amani
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article
Novel and flexible asymmetric supercapacitors based on NiCo2O4 nanosheets coated on Al and Cu tapes for wearable devices applications
Abstract
<jats:title>Abstract</jats:title><jats:p>The binary metal oxides show advantages in energy storage devices. Specifically, nickel cobaltite (NiCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>) materials showed promising pseudocapacitive properties, high electrical conductivity and large surface area by virtue of their effective porous structure. NiCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> nanosheets were hydrothermally grown in this work over flexible tapes of Aluminum (Al) and Copper (Cu). A nanosheets structure obtained of NiCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> as confirmed by SEM and AFM images. The measured thickness by 3D profilometer of NiCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> nanosheets based Al framework found to be 4.3 µm compared to 8.4 µm thick of film based-Cu framework. Asymmetric supercapacitor prepared from graphite and NiCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> electrodes separated by filter paper. Acidic aqueous electrolyte of H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and basic aqueous electrolyte of KOH were employed to verify the cyclic activity and electrochemical reaction of asymmetric prepared supercapacitor devices. The basic KOH electrolyte shows a high stability and better charge transfer/ionic diffusion compared to the acidic H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> electrolyte in particular for NiCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> film-based Cu framework. The energy density and power density values were 0.9 W h kg<jats:sup>−1</jats:sup> and 66.45 W kg<jats:sup>−1</jats:sup>, respectively. The highest specific capacity (in F.g<jats:sup>−1</jats:sup>) = 10.09 coincides with NiCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>/Cu supercapacitor in the basic KOH electrolyte. The charge storage in the supercapacitor system of NiCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> and graphite can be ascribed in the form of Faradic charge transfer and capacitive non-faradic double layer, respectively.</jats:p>