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Influence of electrochemical active surface area on the oxygen evolution reaction and energy storage performance of MnO 2 ‐multiwalled carbon nanotube composite
Author(s) -
Roy Atanu,
Ray Apurba,
Saha Samik,
Ghosh Monalisa,
Das Trisha,
Nandi Mahasweta,
Lal Gobardhan,
Das Sachindranath
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6885
Subject(s) - supercapacitor , oxygen evolution , materials science , composite number , electrochemistry , capacitance , chemical engineering , carbon nanotube , energy storage , catalysis , nanotube , specific surface area , nanotechnology , oxygen , composite material , electrode , chemistry , power (physics) , physics , biochemistry , organic chemistry , engineering , quantum mechanics
Summary The current study emphasizes the influence of electrochemical active surface area (ECSA) on the electrochemical oxygen evolution reaction (OER) and supercapacitive performances of MnO 2 ‐multiwalled carbon nanotube (MC) composites. The best sample exhibits an ECSA of 8.6 cm 2 . 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 MnO 2 ‐MWCNT composite for both energy storage but also in conversion.