Unique ion rectification in hypersaline environment: A high-performance and sustainable power generator system

Zhu, Xuanbo; Hao, Junran; Bao, Bin; Zhou, Yahong; Zhang, Haibo; Pang, Jinhui; Jiang, Zhenhua; Jiang, Lei

doi:10.1126/sciadv.aau1665

Cited by 210 publications

(259 citation statements)

References 41 publications

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“…Under a reverse concentration gradient with low concentration in the ANF side, the corresponding short-circuit current and open-circuit voltage change to 2.14 μA and 71.6 mV, and the calculated inner resistance increases by~50%, which largely suppresses the power generation performance. These observation indicates that the preferential direction of ion transport caused by ionic diode effect still exists under a salinity gradient 25 . Hereafter, the concentration gradient where high concentration is located in the ANF side is defined as the forward gradient, whereas the one where high concentration is located in the gel side is defined as the backward gradient.…”

Section: Gel Lonmentioning

confidence: 71%

“…The synergistic effect between the two layers with inherent asymmetric structure, charge, and wettability would contribute to novel ionic transport properties such as ionic diode effect [21][22][23] . This nonlinear nanofluidic behavior allows unidirectional ion transport and thus could prohibit the flow of any current back into membrane during the energy conversion process, largely decreasing the dissipation of Gibbs free energy as Joule heat and ultimately enhancing the power generation 14,[24][25][26] . In the past years, diverse heterogeneous membranes including organic/organic, inorganic/inorganic, and organic/inorganic hybrid system have been constructed [27][28][29][30][31] .…”

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confidence: 99%

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Improved osmotic energy conversion in heterogeneous membrane boosted by three-dimensional hydrogel interface

et al. 2020

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The emerging heterogeneous membranes show unprecedented superiority in harvesting the osmotic energy between ionic solutions of different salinity. However, the power densities are limited by the low interfacial transport efficiency caused by a mismatch of pore alignment and insufficient coupling between channels of different dimensions. Here we demonstrate the use of three-dimensional (3D) gel interface to achieve high-performance osmotic energy conversion through hybridizing polyelectrolyte hydrogel and aramid nanofiber membrane. The ionic diode effect of the heterogeneous membrane facilitates one-way ion diffusion, and the gel layer provides a charged 3D transport network, greatly enhancing the interfacial transport efficiency. When used for harvesting the osmotic energy from the mixing of sea and river water, the heterogeneous membrane outperforms the state-of-the-art membranes, to the best of our knowledge, with power densities of 5.06 W m −2. The diversity of the polyelectrolyte and gel makes our strategy a potentially universal approach for osmotic energy conversion.

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Section: Gel Lonmentioning

confidence: 71%

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confidence: 99%

Improved osmotic energy conversion in heterogeneous membrane boosted by three-dimensional hydrogel interface

et al. 2020

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“…The bipolar membrane fabricated with SC has been reported previously and the resulted asymmetric membrane showed great energy conversion performance. [30][31][32] Moreover, it is notable that the PES-SO 3 H and PES-OHIm layers originate from the same PES precursor ( Figure S2) in this work, which could benefit the bipolar membrane design. Firstly, compared to the previous works, this design shows the economical aspect similar to the homogeneous membrane.…”

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confidence: 74%

Tailoring A Poly(ether sulfone) Bipolar Membrane: Osmotic‐Energy Generator with High Power Density

et al. 2020

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Osmotic energy, obtained through different concentrations of salt solutions, is recognized as a form of a sustainable energy source. In the past years, membranes derived from asymmetric aromatic compounds have attracted attention because of their low cost and high performance in osmotic energy conversion. The membrane formation process, charging state, functional groups, membrane thickness, and the ion‐exchange capacity of the membrane could affect the power generation performance. Among asymmetric membranes, a bipolar membrane could largely promote the ion transport. Here, two polymers with the same poly(ether sulfone) main chain but opposite charges were synthesized to prepare bipolar membranes by a nonsolvent‐induced phase separation (NIPS) and spin‐coating (SC) method. The maximum power density of the bipolar membrane reaches about 6.2 W m−2 under a 50‐fold salinity gradient, and this result can serve as a reference for the design of bipolar membranes for osmotic energy conversion systems.

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“…6). Moreover, if the Na + ions are replaced by K + ions with higher mobility, the power density could be further enhanced to 34 38 .…”

Section: Resultsmentioning

confidence: 99%

Vertically Transported Graphene Oxide for High‐Performance Osmotic Energy Conversion

et al. 2020

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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, we report a vertically-oriented graphene oxide membranes (V-GOMs) with the combination of high ion selectivity and ultrafast ion permeation, whose permeation is three orders of magnitude higher than the extensively studied horizontally stacked GOMs (H-GOMs). By mixing artificial seawater and river water, we obtained an unprecedented high output power density of 10.6 W m -2 , outperforming all existing materials. Molecular dynamics (MD) simulations reveal the mechanism of the ultrafast transport in V-GOMs results from the quick entering of ions and the large accessible area as well as the apparent short diffusion paths in V-GOMs. These results will facilitate the practical application of

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Unique ion rectification in hypersaline environment: A high-performance and sustainable power generator system

Abstract: Ion-selective Janus membranes with one-way ionic transport in hypersaline solution approach efficient osmotic energy conversion.

Cited by 210 publications

References 41 publications

Improved osmotic energy conversion in heterogeneous membrane boosted by three-dimensional hydrogel interface

Improved osmotic energy conversion in heterogeneous membrane boosted by three-dimensional hydrogel interface

Tailoring A Poly(ether sulfone) Bipolar Membrane: Osmotic‐Energy Generator with High Power Density

Vertically Transported Graphene Oxide for High‐Performance Osmotic Energy Conversion

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