Chemsuschem Chemistry And Sustainability, Energy & Materials 2014-11-01

Use of bipolar membranes for maintaining steady-state pH gradients in membrane-supported, solar-driven water splitting.

Michael B McDonald, Shane Ardo, Nathan S Lewis, Michael S Freund

Index: ChemSusChem 7(11) , 3021-7, (2014)

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Abstract

A bipolar membrane can maintain a steady-state pH difference between the sites of oxidation and reduction in membrane-supported, solar-driven water-splitting systems without changing the overall thermodynamics required to split water. A commercially available bipolar membrane that can serve this purpose has been identified, its performance has been evaluated quantitatively, and is demonstrated to meet the requirements for this application. For effective utilization in integrated solar-driven water-splitting systems, such bipolar membranes must, however, be modified to simultaneously optimize their physical properties such as optical transparency, electronic conductivity and kinetics of water dissociation. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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