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Vertically Transported Graphene Oxide for High-Performance Osmotic Energy Conversion.


ABSTRACT: Reverse electrodialysis is a promising method to harvest the osmotic energy stored between seawater and freshwater, but it has been a long-standing challenge to fabricate permselective membranes with the power density surpassing the industry benchmark of 5.0 W m-2 for half a century. Herein, a vertically transported graphene oxide (V-GO) with the combination of high ion selectivity and ultrafast ion permeation is reported, whose permeation is three orders of magnitude higher than the extensively studied horizontally transported GO (H-GO). By mixing artificial seawater and river water, an unprecedented high output power density of 10.6 W m-2 is obtained, outperforming all existing materials. Molecular dynamics (MD) simulations reveal the mechanism of the ultrafast transport in V-GO results from the quick entering of ions and the large accessible area as well as the apparent short diffusion paths in V-GO. These results will facilitate the practical application of osmotic energy and bring an innovative design strategy for various systems involving ultrafast transport, such as filtration and catalysis.

SUBMITTER: Zhang Z 

PROVIDER: S-EPMC7312320 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Vertically Transported Graphene Oxide for High-Performance Osmotic Energy Conversion.

Zhang Zhenkun Z   Shen Wenhao W   Lin Lingxin L   Wang Mao M   Li Ning N   Zheng Zhifeng Z   Liu Feng F   Cao Liuxuan L  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20200428 12


Reverse electrodialysis is a promising method to harvest the osmotic energy stored between seawater and freshwater, but it has been a long-standing challenge to fabricate permselective membranes with the power density surpassing the industry benchmark of 5.0 W m<sup>-2</sup> for half a century. Herein, a vertically transported graphene oxide (V-GO) with the combination of high ion selectivity and ultrafast ion permeation is reported, whose permeation is three orders of magnitude higher than the  ...[more]

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