期刊
JOULE
卷 2, 期 1, 页码 94-109出版社
CELL PRESS
DOI: 10.1016/j.joule.2017.10.015
关键词
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资金
- Department of Chemistry at the University of California, Irvine
- School of Physical Sciences at the University of California, Irvine
- Gordon and Betty Moore Foundation via a Moore Inventor Fellowship [5641]
- National Science Foundation Graduate Research Fellowship [DGE-1321846]
- National Science Foundation Major Research Instrumentation Program [CHE1338173]
For over half a century, it has been recognized that the classical physics that dictates the behavior of hydrated ion-exchange membranes, such as Nafion, and semiconductors, such as doped silicon, are similar. However, no demonstrations of photovoltaic action from ion-exchange materials existed. We recently reported a synthetic light-driven proton pump derived from an ion-exchange membrane. Absorption of light by covalently bound photoacid molecules resulted in photovoltaic action. This design lacked a second permselective membrane contact, which limited its performance. Here, we report a similar to 60-fold increase in the photovoltage through use of a bipolar membrane structure consisting of a cation-exchange membrane affixed to an anion-exchange membrane. The junction between the layers was characterized in detail using electrochemistry, scanning electron microscopy, spectroscopy, and thermal gravimetric analysis. Our results represent considerable progress toward a device that directly converts sunlight into ionic electricity, which has implications for direct solar desalination of salt water.
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