Realizing Synchronous Energy Harvesting and Ion Separation with Graphene Oxide Membranes

Sun, Pengzhan; Zheng, Feng; Zhu, Ming‐Qiang; Wang, Kunlin; Zhong, Minlin; Wu, Dehai; Zhu, Hongwei

doi:10.1038/srep05528

Cited by 44 publications

(42 citation statements)

References 30 publications

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“…16 Within the laminate, the sp 2 graphitic clusters are connected together across all the stacking layers to form a network of nanocapillaries through which water can experience an ultrafast and unimpeded transmembrane permeation while other liquids and gases are completely blocked. 16,17 Notably, due to the narrow dimension of the nanocapillaries and the co-existence of sp 2 aromatic channels with various oxygen functionalities, the GO membranes can afford excellent selectivity toward various ions based on the molecular sieving effect 18 and diverse chemical interactions, [19][20][21][22] which is favorable for filtration and separation. However, in regard to water desalination, assynthesized GO membranes cannot perform well at the current state due to rapid ion flows.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient quasi-static water desalination using monolayer graphene oxide/titania hybrid laminates

Sun

Qiao

et al. 2015

NPG Asia Mater

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By intercalating monolayer titania (TO) nanosheets into graphene oxide (GO) laminates with mild ultraviolet (UV) reduction, the as-prepared RGO/TO hybrid membranes exhibit excellent water desalination performances. Without external hydrostatic pressures, the ion permeations through the RGO/TO hybrid membranes can be reduced to o5% compared with the GO/TO cases, while the water transmembrane permeations, which are measured using an isotope-labeling technique, can be retained up to~60%. The mechanism for the excellent water desalination performances of the RGO/TO hybrid laminates is discussed, which indicates that the photoreduction of GO by TO is responsible for the effective rejection of ions, while the photoinduced hydrophilic conversion of TO under UV irradiation is responsible for the well-retained water permeabilities. These excellent properties make RGO/TO hybrid membranes favorable for practical water desalination. NPG Asia Materials (2015) 7, e162; doi:10.1038/am.2015.7; published online 27 February 2015 INTRODUCTIONCurrently, water desalination is of crucial importance because of the serious lack of clean and safe fresh water resources. 1,2 The recently developed graphene-based nanomaterials 3 may have the opportunity to make a special contribution to the development of membranebased water desalination technology. Typically, defect-free monolayer graphene film is impermeable to most gases and liquids in spite of its single-atom layer thickness. 4 However, after introducing nanoscale pores with various sizes, shapes and functionalities into the matrix, the resulting nanoporous graphene membranes exhibit excellent selectivity toward various gases and ions, which is favorable for gas separation and water desalination. 5-7 Unfortunately, wafer-scale single-crystal graphene membranes have not been produced thus far, and the irregular nanopores introduced by the current immature techniques cause significant stress concentrations in the matrix, which significantly degrades the mechanical strength of the nanoporous graphene membranes. These disadvantages limit the practical applications of nanoporous graphene films in water desalination, and the investigations on this aspect currently rely mostly on simulations. 6,7 Conversely, graphene oxide (GO), which is synthesized using the modified Hummers' method, 8 is another promising graphene derivative and can potentially be used in practical industrial applications due to its characteristics of low cost and ease of production on a large scale. [9][10][11][12][13] Scientists are now exploring the potential applications of GO in areas such as waste water treatment and water desalination. In view of the structure of the single-layer GO sheet, it can be treated as numerous sp 2 graphitic nanoregions clustered on the sp 3 C-O

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Section: Introductionmentioning

confidence: 99%

Highly efficient quasi-static water desalination using monolayer graphene oxide/titania hybrid laminates

Sun

Qiao

et al. 2015

NPG Asia Mater

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“…This strategy allows the cost‐effective production of 2D‐NLMs with tunable nanochannels at large scale . Given the ease of synthesis, high‐level structural tunability and versatility, 2D‐NLMs have been extensively explored for confined molecular and ion transport by many research groups including Gao, Geim, Gogotsi, Guo, Huang, Jin, Li, Mi, Nair, Ren, Zhu, and more. The following section will lay out some of the typical attributes of 2D‐NLMs obtained by cascading to correlate with the advances in solvation‐involved nanoionics research.…”

Section: Constructing Void Nanostructures For Nanoionics From 2d Nanomentioning

confidence: 99%

Solvation‐Involved Nanoionics: New Opportunities from 2D Nanomaterial Laminar Membranes

et al. 2019

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Nanoporous laminar membranes composed of multilayered 2D nanomaterials (2D‐NLMs) are increasingly being exploited as a unique material platform for understanding solvated ion transport under nanoconfinement and exploring novel nanoionics‐related applications, such as ion sieving, energy storage and harvesting, and in other new ionic devices. Here, the fundamentals of solvation‐involved nanoionics in terms of ionic interactions and their effect on ionic transport behaviors are discussed. This is followed by a summary of key requirements for materials that are being used for solvation‐involved nanoionics research, culminating in a demonstration of unique features of 2D‐NLMs. Selected examples of using 2D‐NLMs to address the key scientific problems related to nanoconfined ion transport and storage are then presented to demonstrate their enormous potential and capabilities for nanoionics research and applications. To conclude, a personal perspective on the challenges and opportunities in this emerging field is presented.

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“…This finding indicates that the through-membrane transport of a cation could be controlled by the electrostatic attraction of its counteranion. (61,62) In a bioelectronic device, abrupt differential changes in the activity of species might take place at the electrode and separator surfaces as shown in Fig. 8.…”

Section: Bulk Membrane Transportmentioning

confidence: 99%

A Short Review of the Architecture and Computational Analysis in the Design of Graphene Based Bioelectronic Devices

2018

Sensors and Materials

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Graphene possesses a high surface-to-volume ratio, which enables biomolecules to attach to it for bioelectronic applications. In this article, first, the classification and applications of bioelectronic devices are briefly reviewed. Then, recent work on real fabricated graphenebased bioelectronic devices as well as the analysis of their architecture and design using a computational approach to their charge transport properties are presented and discussed. A comparison to nongraphitic bioelectronic devices is also given. On the macroscale level, the design of devices is elaborated on the basis of a finite element analysis (FEA) approach, and the impact of design on the performance of the devices is discussed. On the nanoscale level, transport phenomena and their mechanisms for different design categories are elaborated on the basis of the density functional theory (DFT) and other quantum chemistry calculations. The calculated and measured charge transport properties of graphene-based bioelectronic devices are also compared with those of other available bioelectronic devices.

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Realizing Synchronous Energy Harvesting and Ion Separation with Graphene Oxide Membranes

Cited by 44 publications

References 30 publications

Highly efficient quasi-static water desalination using monolayer graphene oxide/titania hybrid laminates

Highly efficient quasi-static water desalination using monolayer graphene oxide/titania hybrid laminates

Solvation‐Involved Nanoionics: New Opportunities from 2D Nanomaterial Laminar Membranes

A Short Review of the Architecture and Computational Analysis in the Design of Graphene Based Bioelectronic Devices

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