期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 46, 页码 24676-24685出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202111024
关键词
anion exchange membranes; biopolymers; photoacids; photobases; proton exchange membranes
资金
- PBC fellowship of Israel's council of higher education
- Gutwirth fellowship
- Binational Science Foundation [2018239]
- Ministry of Science and Technology [3-16243, 3-16312]
- Volkswagen Foundation - Research Cooperation Lower Saxony-Israel [ZN 3625]
- Russel Berrie Nanotechnology Institute (RBNI)
- Grand Technion Energy Program (GTEP)
This study demonstrates light-modulation of the chemical nature and ionic charge carrier concentration within protein-based biopolymers functionalized with photoacids or photobases. Electrical measurements showed an impressive light-modulated increase in ionic conductivity for both types of functionalized biopolymers. Protons are suggested as the charge carriers for the photoacid-functionalized biopolymer, while water-derived anionic hydroxides are suggested as the charge carriers for the photobase-functionalized biopolymer.
Light is a convenient source of energy and the heart of light-harvesting natural systems and devices. Here, we show light-modulation of both the chemical nature and ionic charge carrier concentration within a protein-based biopolymer that was covalently functionalized with photoacids or photobases. We explore the capability of the biopolymer-tethered photoacids and photobases to undergo excited-state proton transfer and capture, respectively. Electrical measurements show that both the photoacid- and photobase-functionalized biopolymers exhibit an impressive light-modulated increase in ionic conductivity. Whereas cationic protons are the charge carriers for the photoacid-functionalized biopolymer, water-derived anionic hydroxides are the suggested charge carriers for the photobase-functionalized biopolymer. Our work introduces a versatile toolbox to photomodulate both protons and hydroxides as charge carriers in polymers, which can be of interest for a variety of applications.
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