Nanohybrid graphene oxide membranes functionalized using 3-mercaptopropyl trimethoxysilane for proton exchange membrane fuel cells

Chowdury, Md Shahjahan Kabir; Cho, Young Jin; Park, Sung Bum; Park, Yong-il

doi:10.1016/j.memsci.2022.121035

Cited by 10 publications

(15 citation statements)

References 67 publications

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“…In the case of MGC-50, the oxidation of the –SH group resulted in the conversion to the –SO 3 H group. The most prominent peaks were observed at 1044.26 and 1148.46 cm –1 , which corresponded to the stretched symmetric and asymmetric vibrational modes of –SO 3 H . No unreacted –SH groups were detected after oxidation in MGC-50.…”

Section: Resultsmentioning

confidence: 95%

“…This phenomenon is attributed to an increase in liquid water absorption resulting from the expansion of the area, accompanied by an increase in the d -space (001). Consequently, the π–π and H-bond interactions in GO nanosheets were weakened, leading to a decrease in mechanical strength . On the other hand, MGCs showed reduced water uptake compared to GOM due to the MPTS-derived siloxane matrix covalently bonded to the GO nanosheets, which filled the macropores.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of Hydrogen-Permeable Ni–Zr Thin Films for Efficient Hydrogen Separation and Their Application in Graphene Oxide-Hydrogen Membrane Fuel Cells

Cho,

Chowdury,

Park

et al. 2023

J. Phys. Chem. C

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Graphene oxide membrane (GOM) shows promise as an alternative for proton exchange membrane fuel cells (PEMFCs) due to its hydrophilic nature, which promotes attractive proton conductivity under wet conditions. However, GOM-based fuel cells (GOMFCs) exhibit lower maximum power density than Nafion(R) due to issues such as fuel crossover, membrane degradation, and loss of oxygen surface functional groups. In this study, amorphous double-layer Ni64Zr36/Ni36Zr64 thin films demonstrate superior hydrogen permeability compared to double-layer Ni64Zr36/Ni36Zr64 (crystalline), single-layer Ni64Zr36 (amorphous/crystalline), and Pd77Ag23 thin films at low temperatures, particularly near room temperature. Two types of amorphous and crystalline Ni–Zr metal films, with double or single layers, were characterized, and their hydrogen purification performance was reported. For hydrogen membrane fuel cell (HMFC) applications, a silanization process was employed by reacting a 50 wt % (5 mg/mL) solution of graphene oxide (GO) with an equimolar ratio of (3-mercaptopropyl)trimethoxysilane [MPTS, HS(CH2)3Si(OCH3)3] (0.790 g/mL) to form a MPTS-modified GO composite electrolyte (MGC-50). In the HMFCs, double-layer membranes composed of GOM or MGC-50 and the hydrogen-permeable Ni–Zr thin film developed in this study were investigated as an electrolyte membrane. A hydrogen-permeable metal thin film, around 40 nm in thickness, was deposited onto GOM or MGC-50 using a Pd or Ni–Zr target via DC magnetron sputtering, resulting in a double-layer graphene oxide-hydrogen membrane (GOHM) electrolyte. The fuel cell performance of the fabricated Pd- and Ni–Zr-based GOHMFCs was compared with conventional PEMFCs.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

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Fabrication of Hydrogen-Permeable Ni–Zr Thin Films for Efficient Hydrogen Separation and Their Application in Graphene Oxide-Hydrogen Membrane Fuel Cells

Cho,

Chowdury,

Park

et al. 2023

J. Phys. Chem. C

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“…While the PVIM-2.5-Si membrane exhibited a broad peak in the 3200−3450 cm −1 region due to a water peak integrated with the hydroxyl band, which was aroused because of hydrogen bonding and the presence of −OH (bound water) associated with QA groups (−N + (CH 3 ) 3 ). 37,38 Characteristic peaks at 956 and 1249 cm −1 were attributed to Si−OH and Si−C, respectively.…”

Section: Characterization Of Pvdf-co-hfp-g-vbc and Pvim Membranesmentioning

confidence: 99%

Highly Conducting and Stable Partial Fluorinated Polymer–Silica-Based Anion Exchange Membrane for Alkaline Fuel Cells

Mandal,

Suhag,

Kumar

et al. 2024

Energy Fuels

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Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) was defluorinated in the presence of alkali, and 4-vinyl benzyl chloride (VBC) was grafted by free radical copolymerization in the presence of an initiator to obtain PVDF-co-HFP-g-VBC. Then, 1-methylimidazole-tethered PVDF-co-HFP-g-VBC was synthesized for architecting the partial fluorinated anion exchange membrane (AEM). To improve essential membrane properties such as conductivity and ion exchange capacity (cation charge density), silica precursor 3-aminopropyl trimethoxysilane was incorporated in the polymer matrix. Prepared AEMs with different structural features were studied for morphology, ion-exchange capacity, water uptake, conductivity, and stability compared to other commercial AEMs. The reported PVIM-2.5-Si membrane, with quaternary ammonium and imidazolium groups, was resistant to alkaline degradation due to the nonavailability of β-hydrogen and negligible chance of nucleophilic (SN 2 ) attack. The suitably assessed PVIM-2.5-Si AEM shows 1.04 V open circuit voltage, corresponding to 294.15 mW cm −2 power density at 555 mA cm −2 current density, in an alkaline membrane fuel cell application.

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“…In past years, many studies have documented GO as a possible alternative to Nafion. 5,6,17,18 The unique surface chemistry of graphene oxide, specifically the presence of oxygen-containing functional groups, allows for proton conductivity. 2 However, at the elevated temperature of over 100 1C the epoxy group of GO decomposes, and the proton conductivity decreases drastically, limiting its practical applications.…”

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confidence: 99%

Thermally stable proton conductivity from nanodiamond oxide

et al. 2023

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Nanohybrid graphene oxide membranes functionalized using 3-mercaptopropyl trimethoxysilane for proton exchange membrane fuel cells

Cited by 10 publications

References 67 publications

Fabrication of Hydrogen-Permeable Ni–Zr Thin Films for Efficient Hydrogen Separation and Their Application in Graphene Oxide-Hydrogen Membrane Fuel Cells

Fabrication of Hydrogen-Permeable Ni–Zr Thin Films for Efficient Hydrogen Separation and Their Application in Graphene Oxide-Hydrogen Membrane Fuel Cells

Highly Conducting and Stable Partial Fluorinated Polymer–Silica-Based Anion Exchange Membrane for Alkaline Fuel Cells

Thermally stable proton conductivity from nanodiamond oxide

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