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Xing, “ Vanadium flow battery for energy storage: Prospects and challenges,” J. The microstructure of currently widely used Nafion membranes was discussed by Ding et al., 5 5. Moore, “ State of understanding of nafion,” Chem. The selectivity of membranes is nearly determined by the micromorphology of membrane. The hydrophilic and hydrophobic regions in membrane greatly affect the membrane stability and conductivity.
![ion diffusion in pva ion diffusion in pva](https://www.mdpi.com/membranes/membranes-10-00262/article_deploy/html/images/membranes-10-00262-g008.png)
One difficulty is devoted to increase membrane selectivity another obstacle concentrates on membrane stability. The existing studies are mainly focused on two challenges of Nafion membrane. Luo, “ Investigations on transfer of water and vanadium ions across nafion membrane in an operating vanadium redox flow battery,” J. Gierke, “ Ion-transport and clustering in nafion perfluorinated membranes,” J. Nafion membrane (perfluorinated sulfonic acid polymers) is the ideal membrane for vanadium redox flow battery which possesses high ion selectivity, conductivity, good electrochemical and heat stability. The membrane or membrane separator is the essential part of vanadium redox flow battery, which plays a role in isolating electrolytes and vanadium ions while transferring protons to complete the circuit. Materials and internal mechanisms of key components such as membrane, electrode, and electrolyte finally influence the property of batteries. Li, “ Research on the characteristics of the vanadium redox-flow battery in power systems applications,” J. This work is helpful to understand working principle of Nafion membrane and will promote the application of all vanadium flow battery.Īs one kind of energy storage technique, the vanadium redox flow battery plays a crucial role on the stabilization and smooth output of renewable energy. The results show that, the adsorbed water on sulfonic acid group in the Nafion membrane forms the water channel for hydrated hydrogen ion transfer more water and higher temperature respectively increase the transfer coefficient of hydrated hydrogen ion in the Nafion membrane by increasing water channel and speeding up movement of the hydrated hydrogen ion.
![ion diffusion in pva ion diffusion in pva](https://www.mdpi.com/membranes/membranes-10-00071/article_deploy/html/images/membranes-10-00071-g006-550.jpg)
The impact of temperature, water content and hydronium ions content on diffusion coefficient was analyzed by the diffusion coefficient, and the radial distribution function and its influencing factor were also studied. In this model, Nafion membrane, water, and hydronium ions were coarse-grained according to the Dissipative Particle Dynamics (DPD) method by Materials Studio software, and the three-dimensional topology of water channel is developed by the DPD theory as well. To study the mesoscopic transfer characteristics of water and hydronium ions in Nafion membrane of all vanadium flow battery, a mesoscopic model was developed in this paper.
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