Vivekananda Mahanta | Indian Institute of Technology Madras, Chennai (original) (raw)
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Papers by Vivekananda Mahanta
Arabian journal for science and engineering, Mar 7, 2024
Advanced energy and sustainability research, Jun 22, 2024
Advanced Materials Interfaces
ACS Applied Energy Materials, 2022
The hydrobromide salt of tribromodopamine (DABr3·HBr) was synthesized for redox flow battery appl... more The hydrobromide salt of tribromodopamine (DABr3·HBr) was synthesized for redox flow battery applications. It exhibited two redox processes at ∼0.74 V (due to the DABr3/DQBr3 redox couple) and 1.0 V (due to the Br–/Br2 redox couple) vs Ag/AgCl in H2SO4, thereby leading to a 3e– reaction per molecule. An aqueous organic redox battery was constructed using DABr3·HBr catholyte and anthraquinone-1,5-disulfonic acid disodium salt (1,5-AQDS) anolyte. A capacity decay of only ∼0.028%/cycle was observed over 2500 galvanostatic charge–discharge (GCD) cycles. The high cycle life (2500 GCD cycles) with ∼99% Coulombic efficiency (CE) is due to the effective Br2-capturing ability of DABr3·HBr through ammonium polybromide formation. The energy efficiency (EE) of the DABr3·HBr-1,5-AQDS static battery was found to be 66% at a current density of 20 mA cm–2.
Materials Letters, 2019
Thermally activated graphite felt (T-GF) electrode coated with carbon derived from the sugar cane... more Thermally activated graphite felt (T-GF) electrode coated with carbon derived from the sugar cane bagasse (AC-SCB) was investigated for catalyzing the VO 2+ /VO 2 + reaction in vanadium redox flow battery (VRFB). Micrographs from the scanning electron microscopy and transmission electron microscopy clearly show the highly porous structure of the carbon. The electrochemical surface area of AC-SCB based electrode is nearly 80 times higher than that of the thermally activated graphite felt (T-GF). But the rate constants calculated from cyclic voltammetry study clearly reveals the higher electrocatalytic activity toward the VO 2+ /VO 2
Journal of The Electrochemical Society, 2022
Dopamine (DA) exhibits quinone/hydroquinone redox activity at ~0.77 V vs. SHE. As the potential i... more Dopamine (DA) exhibits quinone/hydroquinone redox activity at ~0.77 V vs. SHE. As the potential is sufficiently high, this can be a replacement to the VO2+/VO2+ redox couple (catholyte) of the vanadium redox flow battery. But DA undergoes polymerization into polydopamine (PDA) while cycling in the flow battery. Therefore, a hybrid flow battery was constructed with PDA coated thermally activated graphite felt positive electrode and V3+/V2+ in 3 M H2SO4 anolyte. The vanadium-PDA flow battery exhibits a capacity of ~275 mAh gPDA-1 in the first cycle. When the battery was subjected to continuous galvanostatic charge-discharge up to 300 cycles, a capacity retention of ~86 % was observed with coulombic efficiency close to > 99 %. Besides, energy efficiency of ~63 % at a current density of 5 A g-1 was observed. The peak power density of the battery was found to be ~8.83 W g-1 at a current density of ~14.31 A g-1.
Journal of The Electrochemical Society
Arabian journal for science and engineering, Mar 7, 2024
Advanced energy and sustainability research, Jun 22, 2024
Advanced Materials Interfaces
ACS Applied Energy Materials, 2022
The hydrobromide salt of tribromodopamine (DABr3·HBr) was synthesized for redox flow battery appl... more The hydrobromide salt of tribromodopamine (DABr3·HBr) was synthesized for redox flow battery applications. It exhibited two redox processes at ∼0.74 V (due to the DABr3/DQBr3 redox couple) and 1.0 V (due to the Br–/Br2 redox couple) vs Ag/AgCl in H2SO4, thereby leading to a 3e– reaction per molecule. An aqueous organic redox battery was constructed using DABr3·HBr catholyte and anthraquinone-1,5-disulfonic acid disodium salt (1,5-AQDS) anolyte. A capacity decay of only ∼0.028%/cycle was observed over 2500 galvanostatic charge–discharge (GCD) cycles. The high cycle life (2500 GCD cycles) with ∼99% Coulombic efficiency (CE) is due to the effective Br2-capturing ability of DABr3·HBr through ammonium polybromide formation. The energy efficiency (EE) of the DABr3·HBr-1,5-AQDS static battery was found to be 66% at a current density of 20 mA cm–2.
Materials Letters, 2019
Thermally activated graphite felt (T-GF) electrode coated with carbon derived from the sugar cane... more Thermally activated graphite felt (T-GF) electrode coated with carbon derived from the sugar cane bagasse (AC-SCB) was investigated for catalyzing the VO 2+ /VO 2 + reaction in vanadium redox flow battery (VRFB). Micrographs from the scanning electron microscopy and transmission electron microscopy clearly show the highly porous structure of the carbon. The electrochemical surface area of AC-SCB based electrode is nearly 80 times higher than that of the thermally activated graphite felt (T-GF). But the rate constants calculated from cyclic voltammetry study clearly reveals the higher electrocatalytic activity toward the VO 2+ /VO 2
Journal of The Electrochemical Society, 2022
Dopamine (DA) exhibits quinone/hydroquinone redox activity at ~0.77 V vs. SHE. As the potential i... more Dopamine (DA) exhibits quinone/hydroquinone redox activity at ~0.77 V vs. SHE. As the potential is sufficiently high, this can be a replacement to the VO2+/VO2+ redox couple (catholyte) of the vanadium redox flow battery. But DA undergoes polymerization into polydopamine (PDA) while cycling in the flow battery. Therefore, a hybrid flow battery was constructed with PDA coated thermally activated graphite felt positive electrode and V3+/V2+ in 3 M H2SO4 anolyte. The vanadium-PDA flow battery exhibits a capacity of ~275 mAh gPDA-1 in the first cycle. When the battery was subjected to continuous galvanostatic charge-discharge up to 300 cycles, a capacity retention of ~86 % was observed with coulombic efficiency close to > 99 %. Besides, energy efficiency of ~63 % at a current density of 5 A g-1 was observed. The peak power density of the battery was found to be ~8.83 W g-1 at a current density of ~14.31 A g-1.
Journal of The Electrochemical Society