Lamellar porous vermiculite membranes for boosting nanofluidic osmotic energy conversion

Cao, Li; Wu, Hong; Fan, Chunyang; Zhang, Zhiming; Shi, Benbing; Yang, Pengfei; Qiu, Ming; Khan, Niaz Ali; Jiang, Zhongyi

doi:10.1039/d1ta02400k

Cited by 85 publications

(57 citation statements)

References 46 publications

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“…However, the ion diffusion length can substantially decrease if the ions diffuse directly through the nanopores in the basal plane of the nanosheets [66]. In this regard, developing pores on the basal planes of 2D materials can improve the ionic conductance in 2D lamellar membranes [65,67,68]. Development of nanopores on the surface of nanosheets in 2D lamellar membranes for osmotic power generation application have been reported for graphene [67], vermiculite nano-clays [68], and MXene [65].…”

Section: D Lamellar Membranes With Nanoporesmentioning

confidence: 99%

Progress and prospects of two-dimensional materials for membrane-based osmotic power generation

Wang

Safaei

2022

Nano Res. Energy

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The electrical energy that can be harnessed from the salinity difference across the sea water and river water interface can be one of the sustainable and clean energy resources of the future. This energy can be harnessed via the nanofluidic channels that selectively permeate ions. The selective diffusion of cations and anions can produce electricity through reverse electrodialysis. Two-dimensional (2D) materials are a class of nanomaterials that hold great promise in this field. Several breakthrough works have been previously published which demonstrate the high electrical power densities of 2D membranes. The ion transportation can be either through the nano-sized in-plane pores or interlayer spacings of 2D materials. This review article highlights the progress in 2D materials for salinity gradient power generation. Several types of 2D membranes with various nano-architectures are discussed in this review article. These include atom-thick 2D membranes with nanopores, 2D lamellar membranes, 2D lamellar membranes with nanopores, 2D/one-dimensional (1D), and 2D/2D hybrid membranes. The fabrication techniques, physical characteristics, ion transportation properties, and the osmotic power generation of these 2D membranes are elaborated in this review article. Finally, we overview the future research direction in this area. It is envisioned that the research on 2D materials can make practical salinity gradient power generation one step closer to reality.

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Section: D Lamellar Membranes With Nanoporesmentioning

confidence: 99%

Progress and prospects of two-dimensional materials for membrane-based osmotic power generation

Wang

Safaei

2022

Nano Res. Energy

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“…The membrane could maintain a high cation transfer number of over 0.9 with a conversion efficiency beyond 32%, which surpasses most 2D-based membrane systems. [15][16][17]19,41 However, a decline in transfer number occurred under the high concentration gradient, demonstrating the low cation selectivity, which could be ascribed to the ion concentration polarization phenomenon near the membrane surface under the high concentration environment. 11 Finally, a long-term operation of bsGOM under a 50-fold salinity gradient without replenishing the electrolyte was carried out (Figure 4c).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Boosting Osmotic Energy Conversion of Graphene Oxide Membranes via Self-Exfoliation Behavior in Nano-Confinement Spaces

et al. 2022

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Introducing alien intercalations to sub-nanometer scale nanochannels is one desirable strategy to optimize the ion transportation of two-dimensional nanomaterial membranes for improving osmotic energy harvest (OEH). Diverse intercalating agents have been previously utilized to realize this goal in OEH, but with modest performance, complex operations, and physicochemical uncertainty gain. Here, we employ the self-exfoliation behavior of oxidative fragments (OFs) from graphene oxide basal plane under an alkaline environment to encapsulate detached OFs in nanochannels for breaking a trade-off between permeability and selectivity, boosting power density from 1.8 to 4.9 W m–2 with a cation selectivity of 0.9 and revealing a negligible decline in power density and trade-off during a long-term operation test (∼168 h). The strategy of membrane design, employing the intrinsically self-exfoliated OFs to decorate the nanochannels, provides an alternative and facile approach for ion separation, OEH, and other nano-fluidic applications.

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“…The PVM displayed outstanding performance of harvesting nanofluidic energy from the salinity gradient. The maximum output power (10.9 W/m 2 ) displayed by the PVM-device outperformed most of the 2D lamellar membrane-based osmotic energy harvesting systems …”

Section: Novel Properties and Potential Applicationsmentioning

confidence: 99%

Applications of Lamellar Membranes Reconstructed from Clay Mineral-Based Nanosheets: A Review

Saha

Deka

Gogoi

et al. 2022

ACS Appl. Nano Mater.

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Owing to their abundance, ecofriendliness, and multifaceted properties, natural clay minerals are among the most trusted and widely utilized materials on earth. One of the most exciting and latest findings of these minerals is that their layers can be exfoliated into individual flakes and reassembled to produce freestanding and flexible membranes. A tremendous surge in the research related to the futuristic applications of lamellar membranes prepared by restacking exfoliated two-dimensional (2D) nanomaterials has been observed in recent years. In this review article, we aim to summarize the multidirectional progress of lamellar membranes prepared from natural clay minerals. Innovative strategies involved in the exfoliation of clay layers and fabrication of macroscopic membranes through various assembly techniques are highlighted with special emphasis on novel applications such as studying nanofluidic transport in strict 2D, fabrication of smart materials, carrying out chemical reactions under nanoscale confinement, harvesting blue energy, and molecular separation. The clay membranes also inherit extraordinary robustness from their parent minerals and hence open up novel avenues for unique combinations of delicate properties and extraordinary thermal and chemical stability such as hightemperature stable ionic conductors, thermally stable smart materials, and high-temperature energy devices. Exceptional properties imbued to natural clay minerals such as tunable surface wettability and water-assisted healing of physical damage and functional properties by exchanging their inherent interlayer cations are also discussed elaborately.

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Lamellar porous vermiculite membranes for boosting nanofluidic osmotic energy conversion

Abstract: Lamellar membranes with two-dimensional nanofluidic channels hold great promise in harvesting osmotic energy from salinity gradients. However, the power density is often limited by the high transmembrane resistance primarily caused...

Cited by 85 publications

References 46 publications

Progress and prospects of two-dimensional materials for membrane-based osmotic power generation

Progress and prospects of two-dimensional materials for membrane-based osmotic power generation

Boosting Osmotic Energy Conversion of Graphene Oxide Membranes via Self-Exfoliation Behavior in Nano-Confinement Spaces

Applications of Lamellar Membranes Reconstructed from Clay Mineral-Based Nanosheets: A Review

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