Modeling Ion Transport across Thin-Film Composite Membranes During Saltwater Electrolysis.

Autor:	Taylor RF; Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Zhou X; Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Xie C; Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Martinez F; Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia., Zhang X; Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Blankert B; Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia., Picioreanu C; Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia.; Environmental Science & Engineering Program, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia., Logan BE; Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States.; Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States.
Jazyk:	angličtina
Zdroj:	Environmental science & technology [Environ Sci Technol] 2024 Jun 25; Vol. 58 (25), pp. 10969-10978. Date of Electronic Publication: 2024 Jun 11.
DOI:	10.1021/acs.est.4c02397
Abstrakt:	Affordable thin-film composite (TFC) membranes are a potential alternative to more expensive ion exchange membranes in saltwater electrolyzers used for hydrogen gas production. We used a solution-friction transport model to study how the induced potential gradient controls ion transport across the polyamide (PA) active layer and support layers of TFC membranes during electrolysis. The set of parameters was simplified by assigning the same size-related partition and friction coefficients for all salt ions through the membrane active layer. The model was fit to experimental ion transport data from saltwater electrolysis with 600 mM electrolytes at a current density of 10 mA cm -2 . When the electrolyte concentration and current density were increased, the transport of major charge carriers was successfully predicted by the model. Ion transport calculated using the model only minimally changed when the negative active layer charge density was varied from 0 to 600 mM, indicating active layer charge was not largely responsible for controlling ion crossover during electrolysis. Based on model simulations, a sharp pH gradient was predicted to occur within the supporting layer of the membrane. These results can help guide membrane design and operation conditions in water electrolyzers using TFC membranes.
Databáze:	MEDLINE
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