ZnO/CdS based high performance broadband photo-chargeable flexible supercapacitor

Mahapatra, AD and Kumar, S and Sutradhar, A and Sahoo, S and Misra, A (2024) ZnO/CdS based high performance broadband photo-chargeable flexible supercapacitor. In: Electrochimica Acta, 474 .

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Abstract

Photo-chargeable supercapacitors are attracting significant research interest as promising alternative to energy storage devices suitable for next-generation smart appliances. In this work, a heterojunction of cadmium sulphide (CdS) nanoparticles and zinc oxide (ZnO) nanorods is obtained for designing a broadband photo responsive symmetrical supercapacitor. Ultraviolet (UV) absorption by ZnO and visible light interaction with the CdS nanoparticles in the heterostructure contribute synergistically to deliver UV to visible broad spectral response. The heterojunction formation is confirmed by field effect scanning electron microscopy and high-resolution transmission electron microscopy with elemental mapping. Areal capacitance was measured in both the dark and under illumination conditions using cyclic voltammetry and galvanostatic charge�discharge, supported by impedance spectroscopy. Enhancement of areal capacitance from the dark condition was observed between �238 to �1264 for different illumination in broad spectral range measured from the cyclic voltammetry measurements at a constant scan rate of 50 mV s�1 and achieved a highest capacitance value of �139 µF cm�2 under 475 nm visible light for the scan rate of 10 mV s�1. Moreover, the charge generation and storage mechanism under illumination were verified by phototransient response and open-circuit potential measurements. The excellent electrochemical performance observed by maintaining high efficiency (�94.7) with improved cyclic stability upto 5000 cycles. A good capacitance retention (�90) in bending mode when heterojunction applied in bendable devices provide broad future prospect for the metal oxide-sulphide interface in photo-chargeable smart devices. © 2023

Item Type:	Journal Article
Publication:	Electrochimica Acta
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Capacitance; CdS nanoparticles; Cyclic voltammetry; Heterojunctions; High resolution transmission electron microscopy; II-VI semiconductors; Nanorods; Scanning electron microscopy; Supercapacitor; Zinc oxide, Broad spectral; Broadband; Cadmium sulfide nanoparticle; Flexible; Performance; Photo-chargeable; Research interests; Scan rates; Smart appliances; Visible light, Cadmium sulfide
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	28 Feb 2024 13:20
Last Modified:	28 Feb 2024 13:20
URI:	https://eprints.iisc.ac.in/id/eprint/83709

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