期刊
JOURNAL OF POWER SOURCES
卷 447, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227249
关键词
Redox flow battery; Porous electrodes; Lattice Boltzmann model; X-ray computed tomography; Electrochemical performance
资金
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/K036548/2, EP/M027066/1, EP/R021554/1]
- EU FP7 IPACTS [268696]
- iComFluid Projects [312261]
- Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub - United States Department of Energy, Office of Science, Basic Energy Sciences [De-ACO2-06CH11357]
- MIT International Science and Technology Initiative
- Swiss National Science Foundation [P2EZP2-172183]
- Swiss National Science Foundation (SNF) [P2EZP2_172183] Funding Source: Swiss National Science Foundation (SNF)
- EPSRC [EP/M027066/1, EP/L014289/1, EP/R029598/1, EP/K036548/2, EP/R021554/1] Funding Source: UKRI
The porous structure of the electrodes in redox flow batteries (RFBs) plays a critical role in their performance. We develop a framework for understanding the coupled transport and reaction processes in electrodes by combining lattice Boltzmann modelling (LBM) with experimental measurement of electrochemical performance and X-ray computed tomography (CT). 3D pore-scale LBM simulations of a non-aqueous RFB are conducted on the detailed 3D microstructure of three different electrodes (Freudenberg paper, SGL paper and carbon cloth) obtained using X-ray CT. The flow of electrolyte and species within the porous structure as well as electrochemical reactions at the interface between the carbon fibers of the electrode and the liquid electrolyte are solved by a lattice Boltzmann approach. The simulated electrochemical performances are compared against the experimental measurements with excellent agreement, indicating the validity of the LBM simulations for predicting the RFB performance. Electrodes featuring one single dominant peak (i.e., Freudenberg paper and carbon cloth) show better electrochemical performance than the electrode with multiple dominant peaks over a wide pore size distribution (i.e., SGL paper), whilst the presence of a small fraction of large pores is beneficial for pressure drop. This framework is useful to design electrodes with optimal microstructures for RFB applications.
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