Transfer-free in-situ synthesis of high-performance polybenzimidazole grafted graphene oxide-based proton exchange membrane for high-temperature proton exchange membrane fuel cells

Liu, Qingting; Luo, Yuqing; Yang, Shoukun; Xiong, Yuyue; Wang, Rongxin; Fu, Xudong; Zhang, Rong; Hu, Songqing; Bao, Xujin; Xu, Chenxi

doi:10.1016/j.jpowsour.2023.232666

Cited by 53 publications

(9 citation statements)

References 75 publications

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“…In recent years, graphene oxide/polymer composite materials have been extensively utilized in electrodes, supercapacitors, , biosensors, water desalination and waste water treatment, , and various other electrochemical devices owing to their superior physical properties. The large surface area, high aspect ratio, and the presence of hydrophilic functionalities generate abundant proton transport sights in graphene oxide (GO), and therefore, it has been considered and utilized as an effective organic filler in various types of composite-based polymer electrolyte membranes (PEMs). − However, aggregation of GO in the membrane occurs owing to the poor dispersion of GO in organic solvents, and hence significant property improvement of PEMs has often been hampered . In order to avoid this, researchers have grafted various active groups on the GO surface to increase the hydrophilicity so that the dispersion ability enhances.…”

Section: Introductionmentioning

confidence: 99%

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Das

Mukherjee

Jana

2023

ACS Appl. Nano Mater.

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In this study, we have functionalized graphene oxide (GO) by growing polymer chains on its surface and then utilized the polymer-g-GO as a nanofiller with oxypolybenzimidazole (OPBI) to make a highly efficient nanocomposite-based proton exchange membrane (PEM). Three different monomers, namely, acrylamide (AAM), 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), and 3-sulfopropyl acrylate potassium salt (SPAK), were polymerized on the activated GO surface via surface-initiated reversible addition fragmentation chain-transfer polymerization to obtain three different types of polymer-g-GO, namely, pAAM-g-GO, pAMPS-g-GO, and pSPAK-g-GO. Furthermore, the chain length of grafted polymers in each case was altered in order to study the effects of the grafted polymer structure and chain length on the properties of nanocomposite PEMs. The exfoliation of GO nanosheets after polymer grafting was confirmed by studying the surface morphology using various microscopic techniques. Gel permeation chromatography and thermogravimetric analysis helped in measuring the chain length of grafted polymers and grafting density on the GO surface. Furthermore, we have impregnated polymer-g-GO as nanofillers by varying loading wt % into the OPBI to fabricate a mixed matrix membrane which upon doping with phosphoric acid (PA) converted into a mixed matrix PEM. The prepared nanocomposite PEM displayed exceptionally good thermal stability, significantly improved tensile properties, improved PA loading followed by superior proton conductivity, and remarkable PA retention when exposed to saturated water vapor. When the 2.5 wt % pSPAK-g-GO (where the pSPAK chain length is 19.6 kDa) mixed with OPBI, the resulting PEM showed a remarkably high proton conductivity value of 0.327 S cm −1 at 160 °C, a significant 5-fold increment compared to the pristine OPBI membrane (0.067 S cm −1 at 160 °C). To the best of our knowledge, this will be the first report on utilization of polymer-g-GO in polybenzimidazole membranes for hightemperature PEM application.

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Section: Introductionmentioning

confidence: 99%

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Das

Mukherjee

Jana

2023

ACS Appl. Nano Mater.

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“…Thus, the oxidation weakened the interaction between layers of EEG, offering suitable plasticity, and then oxygen bubbles expanded the GP to get an EEG. During the formation, the spherical bubbles endowed the EEG with a spherical wall, and they are similar to the clusters of soap bubbles; thus, they formed a face-to-face configuration of graphene walls in the EEG, which is similar to the hyperboloid structure (positive Gaussian curvature). − …”

Section: Resultsmentioning

confidence: 98%

“…The time determined the oxidation and exfoliation of the EEG, which was reported by our previous work. 26 Thus, in this work, the suitable current density was 15 mA/cm 2 , and the interaction and expansion times were 500 and 1000 s, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…The skeleton has a better morphology at a suitable current density (Figure S2). With further increase in the current density, GP would be exfoliated into graphene oxide (GO), 26 rather than the foam. The optical pictures before and after expansion are presented in the inset of Figure 1c−f.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In the foam with a hyperbolic framework, − the contact between graphene was face to face, rather than point to point or point to line, which would enhance the electrical and thermal transportation in the foam obviously. As reported in the results, the electrical and thermal transportation efficiency of foam with a hyperbolic framework was about 1 order higher than that of traditional foam with a polyhedral network. , …”

Section: Resultsmentioning

confidence: 99%

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Quasi-Hyperbolic Framework Graphite Foam-Based Composites with High Thermal Conductivity and Electromagnetic Shielding Properties Fabricated by an Electrochemical Expansion Method

Zhang,

Fang,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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Nowadays, the rapid development of electronic devices requires composites with high thermal conductivity and good electromagnetic shielding properties. The key challenge lies in the construction of high-performance conductive networks. Herein, an electrochemical expansion graphite foam (EEG) with a quasi-hyperbolic framework was prepared by an electrochemical expansion method, and then the epoxy resin (EP) was filled to fabricate the composites. The graphite plate was first electrochemically intercalated and then foamed, in which plasticization was caused by weak oxidation in intercalation and the quasihyperbolic framework was induced by foaming during expansion. These processes were characterized by Fourier transform infrared (FTIR), micro-Raman, X-ray photoelectron spectroscopy (XPS), and so on. Based on the highly efficient quasi-hyperbolic framework and high-quality graphite structure, the thermal conductivity of the composite reached 43.523 W/(m•K), and total electromagnetic interference (EMI) shielding (SE T ) reached 105 dB. The heat transfer behavior was simulated by finite element analysis (FEA) in detail. This method of preparing high thermal conductivity and electromagnetic shielding materials has a good application prospect.

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Paracetamol sensing with a flexible graphene paper electrode modified with MnCo₂O₄

Shafiyev,

Erçarıkcı,

Dağcı Kıranşan

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDThe design of new‐generation flexible sensors for medical applications has gained considerable interest in the research community in recent past years. Herein, a free‐standing flexible electrode was developed for the electrochemical determination of Paracetamol (PC). This graphene‐based paper electrode was prepared using graphene and MnCo2O4 dispersion with a mold‐casting method followed by chemical reduction. The morphology and structure of our flexible paper electrode (MnCo2O4/GP) were characterized by scanning electron microscopy, energy‐dispersive, X‐ray diffraction, X‐ray photoelectron, and Raman spectroscopy.RESULTSThe as‐prepared flexible MnCo2O4/GP showed outstanding sensing performance for PC, as compared to GP, due to the excellent electrochemical properties of MnCo2O4. The proposed sensor exhibited a wide linear range of 4.64–1000 μM for electrochemical determination of PC with a low detection limit of 1.39 μM. Furthermore, MnCo2O4/GP was successfully applied for PC syrup and tablets with good accuracy results.CONCLUSIONSFor the first time, the present study demonstrated the fabrication and utilization of MnCo2O4‐modified graphene paper to develop a flexible and sensitive electrode for monitoring PC. © 2024 The Author(s). Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Transfer-free in-situ synthesis of high-performance polybenzimidazole grafted graphene oxide-based proton exchange membrane for high-temperature proton exchange membrane fuel cells

Cited by 53 publications

References 75 publications

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Quasi-Hyperbolic Framework Graphite Foam-Based Composites with High Thermal Conductivity and Electromagnetic Shielding Properties Fabricated by an Electrochemical Expansion Method

Paracetamol sensing with a flexible graphene paper electrode modified with MnCo₂O₄

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Transfer-free in-situ synthesis of high-performance polybenzimidazole grafted graphene oxide-based proton exchange membrane for high-temperature proton exchange membrane fuel cells

Cited by 53 publications

References 75 publications

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Quasi-Hyperbolic Framework Graphite Foam-Based Composites with High Thermal Conductivity and Electromagnetic Shielding Properties Fabricated by an Electrochemical Expansion Method

Paracetamol sensing with a flexible graphene paper electrode modified with MnCo2O4

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Product

Resources

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Paracetamol sensing with a flexible graphene paper electrode modified with MnCo₂O₄