Influence of electrochemical active surface area on the oxygen evolution reaction and energy storage performance of MnO2-multiwalled carbon nanotube composite

Roy, A and Ray, A and Saha, S and Ghosh, M and Das, T and Nandi, M and Lal, G and Das, S (2021) Influence of electrochemical active surface area on the oxygen evolution reaction and energy storage performance of MnO2-multiwalled carbon nanotube composite. In: International Journal of Energy Research, 45 (11). pp. 16908-16921.

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Abstract

The current study emphasizes the influence of electrochemical active surface area (ECSA) on the electrochemical oxygen evolution reaction (OER) and supercapacitive performances of MnO2-multiwalled carbon nanotube (MC) composites. The best sample exhibits an ECSA of 8.6 cm2. With the increase of ECSA both OER activity and the supercapacitive performance of the composites increases. The MC composite exhibits a low over potential (0.385 V) for OER activity. The composite displays outstanding catalytic activity for OER in the alkali medium as well as exhibits excellent supercapacitive activity (specific capacitance of 1039 F g�1 at a scan rate of 2 mV s�1). An asymmetric supercapacitor has also been developed which shows very high specific capacitance within a wide working potential of 1.8 V. This device can supply an energy and power density of 60.55 Wh kg�1 and 8.45 kW kg�1, respectively. The role of ECSA has been investigated in both oxygen evolution and supercapacitive process showing the promise of this multifunctional MnO2-MWCNT composite for both energy storage but also in conversion. © 2021 John Wiley & Sons Ltd.

Item Type:	Journal Article
Publication:	International Journal of Energy Research
Publisher:	John Wiley and Sons Ltd
Additional Information:	The copyright for this article belongs to John Wiley and Sons Ltd
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	16 Aug 2021 09:55
Last Modified:	16 Aug 2021 09:55
URI:	http://eprints.iisc.ac.in/id/eprint/69205

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