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Title: An enhanced 1-D model of a hydrogen-bromine flow battery
Authors : Wlodarczyk, Jakub
Cantu, Brenda
Fischer, Peter
Küttinger, Michael
Schumacher, Jürgen
Proceedings: 16th symposium on modeling and experimental validation of electrochemical energy devices (ModVal 2019) : book of abstracts
Conference details: ModVal 2019, Braunschweig, Germany, 12 - 13 March 2019
Editors of the parent work: Krewer, Ulrike
Laue, Vincent
Redeker, Andreas
Publisher / Ed. Institution : Technische Universität Braunschweig
Issue Date: 2019
License (according to publishing contract) : Not specified
Type of review: Editorial review
Language : English
Subjects : Hydrogen-bromine redox flow battery; Modeling and simulation
Subject (DDC) : 621.3: Electrical engineering and electronics
Abstract: One of the flow battery systems which utilizes abundantly available chemicals for electrolytes, characterized by high power density, is the hydrogen-bromine flow battery. First proposed in 1969 [1], it has recently received new attention and has been undergoing development, in which numerical simulations play an important role. To date, a few papers devoted to modeling and simulation of this particular new-generation flow battery chemistry were published. In the present work, a one-dimensional (1D), steady-state, macrohomogeneous, mathematical model of a single-cell hydrogen-bromine flow battery (HBFB) is developed, described and solved. It comprises of the most relevant transport through-plane processes and electrochemical phenomena for the operation of the HBFB, namely: charge transport, water, gaseous hydrogen, proton, bromine and (tri)bromide mass transport. Furthermore, the model is enhanced with supplementary phenomena to better approximate the physics described in the simulation such as: bromine-tribromide ionic equilibria, Nernstian losses due to reactant local surface concentration variations, Donnan potential on the HBr/Br2 solution-membrane interface, and gas adsorption in the ionomer on the gaseous hydrogen side according to Henry’s law. The model description emphasizes the importance of electrochemical and flux sign conventions, and the meaning of appropriate boundary conditions, which was seldom the case in the published modeling approaches. A complete set of plots of each dependent variable and the associated fluxes are provided. A system of nonlinear second-order partial differential equations describing the problem is solved using COMSOL Multiphysics software with the General PDE Form module for a better control over the actual governing equations (conservation laws) as well as auxiliary algebraic field equations. The 1D approach allows for solving the problem within seconds on a laptop-class computer and permits running multiple case studies within short time. Moreover, a parametric study is performed (Fig. 1) to examine the impact of selected parameters on the overall performance of a single cell. The validity of the model is verified based on results from a set of experiments carried out at Fraunhofer ICT (internal, multidisciplinary cooperation within the Flowcamp* project) using an isothermal single test cell.
Further description : Acknowledgements: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement no. 765289. *Project website:
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Conference Poster
DOI : 10.21256/zhaw-2791
Published as part of the ZHAW project : Redox Flow Battery Campus
Appears in Collections:Publikationen School of Engineering

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