Thin-Film Composite Membranes for Hydrogen Evolution with a Saline Catholyte Water Feed.

Autor: Shi L; Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States.; College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P. R. China., Zhou X; Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Taylor RF; Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Xie C; Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Bian B; Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Hall DM; Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Rossi R; Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States.; Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States., Hickner MA; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Gorski CA; Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States., Logan BE; Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States.; Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States.
Jazyk: angličtina
Zdroj: Environmental science & technology [Environ Sci Technol] 2024 Jan 16; Vol. 58 (2), pp. 1131-1141. Date of Electronic Publication: 2024 Jan 03.
DOI: 10.1021/acs.est.3c07957
Abstrakt: Hydrogen gas evolution using an impure or saline water feed is a promising strategy to reduce overall energy consumption and investment costs for on-site, large-scale production using renewable energy sources. The chlorine evolution reaction is one of the biggest concerns in hydrogen evolution with impure water feeds. The "alkaline design criterion" in impure water electrolysis was examined here because water oxidation catalysts can exhibit a larger kinetic overpotential without interfering chlorine chemistry under alkaline conditions. Here, we demonstrated that relatively inexpensive thin-film composite (TFC) membranes, currently used for high-pressure reverse osmosis (RO) desalination applications, can have much higher rejection of Cl - (total crossover of 2.9 ± 0.9 mmol) than an anion-exchange membrane (AEM) (51.8 ± 2.3 mmol) with electrolytes of 0.5 M KOH for the anolyte and 0.5 M NaCl for the catholyte with a constant current (100 mA/cm 2 for 20 h). The membrane resistances, which were similar for the TFC membrane and the AEM based on electrochemical impedance spectroscopy (EIS) and Ohm's law methods, could be further reduced by increasing the electrolyte concentration or removal of the structural polyester supporting layer (TFC-no PET). TFC membranes could enable pressurized gas production, as this membrane was demonstrated to be mechanically stable with no change in permeate flux at 35 bar. These results show that TFC membranes provide a novel pathway for producing green hydrogen with a saline water feed at elevated pressures compared to systems using AEMs or porous diaphragms.
Databáze: MEDLINE
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