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  Light-driven directional ion transport for enhanced osmotic energy harvesting

Xiao, K., Giusto, P., Chen, F., Chen, R., Heil, T., Cao, S., et al. (2021). Light-driven directional ion transport for enhanced osmotic energy harvesting. National Science Review, 8(8): nwaa231. doi:10.1093/nsr/nwaa231.

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 Creators:
Xiao, Kai1, Author              
Giusto, Paolo2, Author              
Chen, Fengxiang, Author
Chen, Ruotian, Author
Heil, Tobias3, Author              
Cao, Shaowen4, Author              
Chen, Lu4, Author              
Fan, Fengtao, Author
Jiang, Lei, Author
Affiliations:
1Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863288              
2Paolo Giusto, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3245192              
3Nadezda V. Tarakina, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2522693              
4Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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Free keywords: ion pump, ion transport, nanofluidic, porous membrane, carbon nitride
 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 that TiO2/C3N4 semiconductor heterojunction nanotube membrane can realize a similar light-driven directional ion transport performance as biological systems. This heterojunction system can be fabricated by two simple deposition steps. Under unilateral illumination, 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 photo generated 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 the development of ionic photoelectric conversion and their integration in other applications, e.g. water desalination.

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Language(s): eng - English
 Dates: 2020-09-082021
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1093/nsr/nwaa231
BibTex Citekey: 10.1093/nsr/nwaa231
 Degree: -

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Title: National Science Review
  Other : NSR / Chinese Academy of Sciences
  Abbreviation : NSR
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 8 (8) Sequence Number: nwaa231 Start / End Page: - Identifier: ISSN: 2095-5138