Ultrahigh permeance of a chemical cross-linked graphene oxide nanofiltration membrane enhanced by cation–π interaction

Yi, Ruobing; Yang, Rujie; Yu, Risheng; Lan, Jian; Chen, Junlang; Wang, Zhikun; Chen, Liang; Wu, Minghong

doi:10.1039/c9ra07109a

Cited by 17 publications

(4 citation statements)

References 31 publications

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“…As shown in Figure 4c,d the proportion of oxygen-containing functional groups can be obtained according to C1s curve-fitting peak analysis. Four peaks at 284.6 eV, 286.7 eV, 287.8 eV and 288.9 eV correspond to C-C/C=C, C-O/C-O-C, C=O and O-C=O, respectively [3,19,32,33]. It can be observed that the amount of hydroxyl/epoxy in GO is lower than that in HGO, which is consistent with the FTIR results.…”

Section: Characterization Resultssupporting

confidence: 86%

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Peng

Zhao

et al. 2022

Membranes

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The application of graphene oxide (GO)-based membranes combined with a quartz crystal microbalance (QCM) as a humidity sensor has attracted great interest over the past few years. Understanding the influence of the structure of the GO membrane (GOM) on the adsorption/desorption of water molecules and the transport mechanism of water molecules in the membrane is crucial for development of applications using GOM-based humidity sensors. In this paper, by investigating the effects of oxygen-containing groups, flake size and interlayer spacing on the performance of humidity sensing, it was found that humidity-sensing performance could be improved by rational membrane-structure design and the introduction of magnesium ions, which can expand the interlayer spacing. Therefore, a novel HGO&GO&Mg2+ structure prepared by uniformly doping magnesium ions into GO&HGO thin composite membranes was designed for humidity sensing from 11.3% RH to 97.3% RH. The corresponding sensor exhibits a greatly improved humidity sensitivity (~34.3 Hz/%RH) compared with the original pure GO-based QCM sensor (~4.0 Hz/%RH). In addition, the sensor exhibits rapid response/recovery times (7 s/6 s), low hysteresis (~3.2%), excellent repeatability and good stability. This research is conducive to understanding the mechanism of GOM-based humidity sensors. Owing to its good humidity-sensing properties, the HGO&GO&Mg2+ membrane-based QCM humidity sensor is a good candidate for humidity sensing.

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Section: Characterization Resultssupporting

confidence: 86%

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Peng

Zhao

et al. 2022

Membranes

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“…The important noncovalent cation-π interaction between cations and the delocalized aromatic graphene domains distributed in rGO 32 are supposed to be at the origin of the change in the surface charges of rGO 33 . In the case of Mg 2+ , the higher charge density as a divalent cation 34 , 35 explains the higher adsorption energy induced by cation-π interaction versus Li + 35 , 36 . Therefore, the enrichment of Mg 2+ onto the rGO surface is expected to effectively screen the surface charge and makes the surface zeta potential less negative than Li + .…”

Section: Resultsmentioning

confidence: 99%

Cation desolvation-induced capacitance enhancement in reduced graphene oxide (rGO)

Ge,

Shao,

Raymundo-Piñero

et al. 2024

Nat Commun

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Understanding the local electrochemical processes is of key importance for efficient energy storage applications, including electrochemical double layer capacitors. In this work, we studied the charge storage mechanism of a model material - reduced graphene oxide (rGO) - in aqueous electrolyte using the combination of cavity micro-electrode, operando electrochemical quartz crystal microbalance (EQCM) and operando electrochemical dilatometry (ECD) tools. We evidence two regions with different charge storage mechanisms, depending on the cation-carbon interaction. Notably, under high cathodic polarization (region II), we report an important capacitance increase in Zn2+ containing electrolyte with minimum volume expansion, which is associated with Zn2+ desolvation resulting from strong electrostatic Zn2+-rGO interactions. These results highlight the significant role of ion-electrode interaction strength and cation desolvation in modulating the charging mechanisms, offering potential pathways for optimized capacitive energy storage. As a broader perspective, understanding confined electrochemical systems and the coupling between chemical, electrochemical and transport processes in confinement may open tremendous opportunities for energy, catalysis or water treatment applications in the future.

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“…3B). [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] Furthermore, glutaraldehyde 67 and 1-allyl-3-vinylimidazolium chloride 68 have also been utilized as cross-linking agents to improve the stability of the GO membrane in water. Although covalent cross-linking can endow the GO membranes with enough stability in water, the excessive cross-linking will disturb and block water transport within the GO nanochannels, leading to the decrease of the water flux of the membrane.…”

Section: Strategies For Improving the Stability Of Go Membranes In Watermentioning

confidence: 99%

The stability of a graphene oxide (GO) nanofiltration (NF) membrane in an aqueous environment: progress and challenges

Wang

Guo

et al. 2020

Mater. Adv.

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Ultrahigh permeance of a chemical cross-linked graphene oxide nanofiltration membrane enhanced by cation–π interaction

Abstract: Chemical cross-linking together with magnesium ions, potentially promoting reasonable cross-linking and improving the water channels of membrane in terms of flatness and surface with low mass transfer resistance.

Cited by 17 publications

References 31 publications

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Cation desolvation-induced capacitance enhancement in reduced graphene oxide (rGO)

The stability of a graphene oxide (GO) nanofiltration (NF) membrane in an aqueous environment: progress and challenges

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