Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 12, Pages 15166-15174Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c02833
Keywords
aqueous organic redox flow battery; bromine flow battery; zinc-bromine flow battery; quinone-based flow battery; stable organic catholyte; acidic flow battery; dopamine; tribromodopamine; polydopamine
Funding
- Ministry of Education (MoE) , India
- Department of Science and Technology (DST) , India [DST/TMD/MECSP/2K17/20]
- IITM-MHRD for setting up the Potential Centre of Excellence (pCoE) - Advance Centre for Energy Storage and Conversion [11/9/2019-U.3 (A)]
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The hydrobromide salt of tribromodopamine was synthesized and used in a redox flow battery, showing high cycle life and Coulombic efficiency due to the effective capturing of bromine.
The hydrobromide salt of tribromodopamine (DABr(3)center dot HBr) was synthesized for redox flow battery applications. It exhibited two redox processes at similar to 0.74 V (due to the DABr(3)/DQBr(3) redox couple) and 1.0 V (due to the Br-/Br-2 redox couple) vs Ag/AgCl in H2SO4, thereby leading to a 3e(-) reaction per molecule. An aqueous organic redox battery was constructed using DABr(3)center dot HBr catholyte and anthraquinone-1,5-disulfonic acid disodium salt (1,5-AQDS) anolyte. A capacity decay of only similar to 0.028%/cycle was observed over 2500 galvanostatic charge-discharge (GCD) cycles. The high cycle life (2500 GCD cycles) with similar to 99% Coulombic efficiency (CE) is due to the effective Br-2-capturing ability of DABr(3)center dot HBr through ammonium polybromide formation. The energy efficiency (EE) of the DABr(3)center dot HBr-1,5-AQDS static battery was found to be 66% at a current density of 20 mA cm(-2).
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