Voltage generation in optically sensitive supercapacitor for enhanced performance

Boruah, BD and Misra, A (2019) Voltage generation in optically sensitive supercapacitor for enhanced performance. In: ACS Applied Energy Materials, 2 (1). pp. 278-286.

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Abstract

An optically sensitive solid-state supercapacitor (SSC) is presented for direct utilization of optical energy for charge storage in a compact opto-electrochemical system. Optically and electrochemically active, energy efficient heterostructure nanomaterials of zinc cobalt oxide and zinc oxide (ZCZO) nanorods (NRs) were used as electrodes for the SSC, where the energy storage performance of the as-fabricated SSC displays highly sensitive behavior toward ultraviolet (UV) illumination, where the photoinduced electrons under UV radiation notably participate in the energy storage process that boosts the overall charge storage capacity (174%) of the SSC. The photogenerated areal capacitance and energy density under UV were found to be 150 μF/cm2 and 11.8 × 10-3 μWh/cm2. Moreover, SSC can be charged by exposure to UV radiation without any integration of an external electrical power source, where the self-generated voltage in the SSC was measured to be 350 mV under the UV illumination, which is much higher than so-far-presented self-powered SSCs.

Item Type:	Journal Article
Publication:	ACS Applied Energy Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Capacitance; Cobalt compounds; Energy efficiency; Energy storage; II-VI semiconductors; Nanorods; Nanostructured materials; Ultraviolet radiation; Zinc oxide, Charge storage capacity; Electrical power sources; Electrochemical systems; Heterostructure nanomaterials; Optically driven; Self-powered; Solid-state supercapacitors; Ultraviolet illumination, Supercapacitor
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	28 Nov 2022 07:04
Last Modified:	28 Nov 2022 07:04
URI:	https://eprints.iisc.ac.in/id/eprint/78082

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