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

doi:10.1002/cssc.201402288

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

California Institute of Technology

Research output: Contribution to journal › Article › peer-review

75 Citations (Scopus)

Abstract

A bipolar membrane can maintain a steady-state pH difference between the sites of oxidation and reduction in membranesupported, 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 solardriven 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.

Original language	English
Pages (from-to)	3021-3027
Number of pages	7
Journal	ChemSusChem
Volume	7
Issue number	11
DOIs	https://doi.org/10.1002/cssc.201402288
Publication status	Published - Nov 1 2014

Keywords

Artificial photosynthesis
Bipolar membranes
Earth-abundant materials
PEC membranes
pH gradients

ASJC Scopus subject areas

Environmental Chemistry
Chemical Engineering(all)
Materials Science(all)
Energy(all)

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AU - Freund, Michael S.

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AB - A bipolar membrane can maintain a steady-state pH difference between the sites of oxidation and reduction in membranesupported, 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 solardriven 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.

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KW - Earth-abundant materials

KW - PEC membranes

KW - pH gradients

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

Abstract

Keywords

ASJC Scopus subject areas

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