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Light-driven directional ion transport for enhanced osmotic energy harvesting.


ABSTRACT: Light-driven ion (proton) transport is a crucial process both for photosynthesis of green plants and solar energy harvesting of some archaea. Here, we describe use of a TiO2/C3N4 semiconductor heterojunction nanotube membrane to realize similar light-driven directional ion transport performance to that of biological systems. This heterojunction system can be fabricated by two simple deposition steps. Under unilateral illumination, the TiO2/C3N4 heterojunction nanotube membrane can generate a photocurrent of about 9 μA/cm2, corresponding to a pumping stream of ∼5500 ions per second per nanotube. By changing the position of TiO2 and C3N4, a reverse equivalent ionic current can also be realized. Directional transport of photogenerated electrons and holes results in a transmembrane potential, which is the basis of the light-driven ion transport phenomenon. As a proof of concept, we also show that this system can be used for enhanced osmotic energy generation. The artificial light-driven ion transport system proposed here offers a further step forward on the roadmap for development of ionic photoelectric conversion and integration into other applications, for example water desalination.

SUBMITTER: Xiao K 

PROVIDER: S-EPMC8363323 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature

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Light-driven directional ion transport for enhanced osmotic energy harvesting.

Xiao Kai K   Giusto Paolo P   Chen Fengxiang F   Chen Ruotian R   Heil Tobias T   Cao Shaowen S   Chen Lu L   Fan Fengtao F   Jiang Lei L  

National science review 20200908 8


Light-driven ion (proton) transport is a crucial process both for photosynthesis of green plants and solar energy harvesting of some archaea. Here, we describe use of a TiO<sub>2</sub>/C<sub>3</sub>N<sub>4</sub> semiconductor heterojunction nanotube membrane to realize similar light-driven directional ion transport performance to that of biological systems. This heterojunction system can be fabricated by two simple deposition steps. Under unilateral illumination, the TiO<sub>2</sub>/C<sub>3</sub  ...[more]

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