Print Email Facebook Twitter Resistance Breakdown of a Membraneless Hydrogen-Bromine Redox Flow Battery Title Resistance Breakdown of a Membraneless Hydrogen-Bromine Redox Flow Battery Author Alfisi, Daniel (Technion) Shocron, Amit N. (Technion) Gloukhovski, Robert (Technion) Vermaas, D.A. (TU Delft ChemE/Transport Phenomena) Suss, Matthew E. (Technion) Date 2022 Abstract A key bottleneck to society's transition to renewable energy is the lack of cost-effective energy storage systems. Hydrogen-bromine redox flow batteries are seen as a promising solution, due to the use of low-cost reactants and highly conductive electrolytes, but market penetration is prevented due to high capital costs, for example due to costly membranes to prevent bromine crossover. Membraneless hydrogen-bromine cells relying on colaminar flows have thus been investigated, showing high power density nearing 1 W/cm2. However, no detailed breakdown of resistance losses has been performed to-date, a knowledge gap which impedes further progress. Here, we characterize such a battery, showing the main sources of loss are the porous cathode, due to both Faradaic and Ohmic losses, followed by Ohmic losses in the electrolyte channel, with all other sources relatively minor contributors. We further develop and fit analytical expressions for the impedance of porous electrodes in high power density electrochemical cells to impedance measurements from our battery, which enabled the detailed cell resistance breakdown and determination of important electrode parameters such as volumetric exchange current density and specific capacitance. The insights developed here will enable improved engineering designs to unlock exceptionally high-power density membraneless flow batteries. Subject Electrical GridElectrochemical Impedance SpectroscopyEnergy StorageHydrogen-Bromine BatteryRedox Flow Batteries To reference this document use: http://resolver.tudelft.nl/uuid:ad489b8f-edf1-4ce6-a4e4-e804a65ed07d DOI https://doi.org/10.1021/acssuschemeng.2c02169 ISSN 2168-0485 Source ACS Sustainable Chemistry and Engineering, 10 (39), 12985-12992 Part of collection Institutional Repository Document type journal article Rights © 2022 Daniel Alfisi, Amit N. Shocron, Robert Gloukhovski, D.A. Vermaas, Matthew E. Suss Files PDF acssuschemeng.2c02169.pdf 2.78 MB Close viewer /islandora/object/uuid:ad489b8f-edf1-4ce6-a4e4-e804a65ed07d/datastream/OBJ/view