Electrodeposited Manganese Oxide based Redox Mediator Driven 2.2 V High Energy Density Aqueous Supercapacitor

Pappu, Samhita and Rao, Tata N. and Martha, Surendra Kumar and et al, . (2022) Electrodeposited Manganese Oxide based Redox Mediator Driven 2.2 V High Energy Density Aqueous Supercapacitor. Energy, 243. ISSN 0360-5442

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Aqueous supercapacitors with enhanced energy densities are much needed for their non-toxic and environmental benignity. Metal oxide based pseudocapacitors enhance the specific capacitance and energy density of the device by enlarging the potential window of aqueous electrolyte beyond 1.0 V along with faradaic participation. To capture this advantage, MnO2 nanosheets are synthesized by eco-friendly electrodeposition technique. The charge storage capability of MnO2 in 0.5 M Na2SO4 could be extended to 1.20 V vs. Ag/AgCl, thus becoming the best positive electrode for asymmetric supercapacitors (ASCs). The effect of potassium iodide (KI) redox additive to the electrolyte in improving the energy density and device performance is analyzed with varying concentrations. ASC designed with YP-50 carbon and MnO2 as negative and positive electrodes in optimized KI concentration with 2.2 V electrochemical window resulted in superior specific capacitance of 134 F g−1 and capacity retention of 83% for 10,000 cycles with a high energy density of 90 Wh kg−1 owing to the dual pseudocapacitance of active material and electrolyte. The work further provides an understanding of MnO2 charge storage properties beyond the most reported 0–0.8/0–1.0 V potential window and redox mediator's role in boosting overall device performance in aqueous ASC's. © 2021 Elsevier Ltd

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IITH Creators:
IITH CreatorsORCiD
Martha, Surendra Kumarhttps://orcid.org/0000-0002-7762-7237
Item Type: Article
Additional Information: The authors acknowledge the financial support received from the ARCI-technical research center {ref. AI/1/65/ARCI/2014 (c)} funded by the Department of Science and Technology (DST), Government of India . The authors would further like to acknowledge Dr. Y. Srinivasa Rao, Dr. Neha Y. Hebalkar, Dr. Koppoju Suresh, and Dr. Sreekanth Mandati for their support in characterization of samples.
Uncontrolled Keywords: Asymmetric supercapacitor; Energy density; Manganese oxide; Potassium iodide; Redox additive
Subjects: Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering
Divisions: Department of Chemistry
Depositing User: . LibTrainee 2021
Date Deposited: 22 Jul 2022 06:51
Last Modified: 22 Jul 2022 06:51
URI: http://raiith.iith.ac.in/id/eprint/9560
Publisher URL: http://doi.org/10.1016/j.energy.2021.122751
OA policy: https://v2.sherpa.ac.uk/id/publication/16505
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