Publication type: Conference other
Type of review: Peer review (abstract)
Title: Thermodynamics and diffusional mass transport problems in concentrated electrolytes : an application in H2/Br2 redox flow battery modeling
Authors: Wlodarczyk, Jakub Karol
Baltes, Norman
Friedrich, Andreas
Schumacher, Jürgen
et. al: No
Proceedings: MODVAL 17 : Book of Abstracts
Page(s): 31
Conference details: 17th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies (MODVAL 17), online, 20-22 April 2021
Issue Date: 2021
Publisher / Ed. Institution: EPFL Valais/Wallis
Publisher / Ed. Institution: Sion
Language: English
Subjects: Mass transport; Concentrated electrolytes; Modelling and simulation; Rredox-flow battery; Bromine; Ttermodynamics
Subject (DDC): 621.3: Electrical, communications, control engineering
Abstract: The burning issue of large-scale energy storage for the use in combination with a rapidly growing renewable energy sector could be resolved by wide-ranging commercialisation of reliable redox flow battery (RFB) systems. In the RFB systems, high energy density is achieved by increasing the concentration of active redox species in the electrolyte or compressing gas in hybrid systems, such as the hydrogen-bromine redox flow battery (HBRFB). High electrolyte concentration, although favourable from the practical perspective, poses serious difficulties in modelling and simulation of energy storage devices. The presented work describes an experimental study employing liquid junction-free potentiometric technique to measure cell potential and ultramicrolectrodes (UMEs) to determine diffusion coefficients of both reduced and oxidized species in concentrated electrolytes (1-8 mol L-1). The experiments are performed in an exemplary HBRFB electrolyte of diluted and concentrated hydrobromic acid and bromine. Experimental results are then analysed by means of mathematical modelling utilising more advanced treatment of mass transport than e.g. simple Fick’s law and enhanced Nernst equation, which takes into account electrolyte activity and homogeneous ionic equilibria. It is considered that strong ionic interactions, variations of electrolyte viscosity with concentration and the impact of ionic activity on diffusion coefficient introduce non-linearities in mass transport phenomena. An improved parametrisation of cell thermodynamics and diffusional mass fluxes enhances model credibility and generalizes the mathematical description, without resorting to formal potentials or empirical formulae. The work is performed within the FlowCamp project, a part of Maria Skłodowska-Curie Actions from the EU Horizon 2020 programme.
URI: https://digitalcollection.zhaw.ch/handle/11475/22602
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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