High performance nanocomposite proton exchange membranes based on the nanohybrids formed by chemically bonding phosphotungstic acid with covalent organic frameworks

Zhai, Shaoxiong; Lu, Zhongrui; Ai, Yuna; Jia, Xiaoyang; Yang, Yongrong; Liu, Xin; Tian, Miao; Bian, Xingming; Lin, Jun; He, Shaojian

doi:10.1016/j.jpowsour.2022.232332

Cited by 37 publications

(24 citation statements)

References 60 publications

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“…The HZF1/Aquivion composite membrane exhibited a slightly reduced tensile strength and elongation at break, possibly due to the incorporation of the crystalline porous nanomaterials. However, when the HPA content increased, the HZF/Aquivion composite membranes (i.e., HZF2, HZF3, and HZF4) exhibited an improvement in tensile strength and Young’s modulus. , For example, the HZF4/Aquivion composite membrane had a tensile strength of 66.7 MPa, an elongation at break of 78.5%, and a Young’s modulus of 6.93 MPa. This phenomenon might be because HZF became less porous and hydrophilic owing to high-HPA functionalization.…”

Section: Resultsmentioning

confidence: 99%

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Ryu

Jae

Kim

et al. 2023

ACS Appl. Energy Mater.

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Heteropoly acids (HPAs) have been used in perfluorinated sulfonic acid polymers such as Nafion or Aquivion to form organic/inorganic composite membranes with improved proton conductivity and water management ability. However, the HPA has a low BET surface area with water-soluble characteristics, which prevents enhancement in the number of proton-transferable sites and accelerates HPA leaching while operating the proton exchange membrane fuel cells (PEMFCs). The HPA was functionalized on zeolite imidazolate framework-67 (ZIF-67) nanoparticles to address these drawbacks. Incorporating it into the MOF made it water insoluble and enhanced the internal surface area, leading to a good proton conductor. Using a synthetic approach, we were able to form HPA-functionalized ZIF-67 (HZF), which can be optimized with simple compositional modifications and whose HPA content is controllable. The HZF nanoparticles exhibited a hollow structure that formed an HPA−ZIF shell layer because the dissociated cobalt ion and 2-methylimidazole diffused from the core side to the surface layer to interact with the HPA. The HZF/Aquivion composite membranes exhibited excellent mechanical properties and good resistance to the polymer chain swelling phenomenon. The electrochemical properties of the HZF/ Aquivion composite membranes with various HZFs were characterized to determine the optimal HPA content in the HZF nanoparticles. The 3 wt % hollow HZF/Aquivion composite membrane with the appropriate HPA content exhibited higher proton conductivities than the pure Aquivion membrane, measuring 0.14 S/cm at 25 °C and 100% RH and 0.09 S/cm at 80 °C and 30% RH. This result indicates that the hollow HZF/Aquivion composite membrane can provide efficient proton transfer and water management ability, suggesting a good strategy for the PEMFC operation.

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Section: Resultsmentioning

confidence: 99%

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Ryu

Jae

Kim

et al. 2023

ACS Appl. Energy Mater.

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“…92 HPW/COF (P-COF) nanohybrids by using a one-step hydrothermal method to overcome the leaching problem of HPW by immobilizing it within the cavities of the COF. 93 The nanocomposite membranes comprising Nafion/P-COF showed enhancements in proton conductivity and water retention capability. A Nafion nanocomposite membrane having 4 wt % P-COF (Nafion/P-COF-4) showed a proton conductivity of 0.061 S cm −1 at 25 °C under 55% RH and a peak power density of 724 mW cm −2 at 80 °C and 50% RH (Figure 6).…”

Section: Their Requirementsmentioning

confidence: 96%

“…These COFs have great potential for improving the water retention and proton conductivity of the membrane owing to their ordered 1D channels . Zhai et al developed HPW/COF (P-COF) nanohybrids by using a one-step hydrothermal method to overcome the leaching problem of HPW by immobilizing it within the cavities of the COF . The nanocomposite membranes comprising Nafion/P-COF showed enhancements in proton conductivity and water retention capability.…”

Section: Perfluorosulfonic Acid (Pfsa) Polymer Membranesmentioning

confidence: 99%

“…(d) Changes of cell voltage for MEAs assembled with recast Nafion (58 μm) and Nafion/P-COF-4 (63 μm) membranes at 500 mA cm –2 under 80 °C and 50% RH. Reprinted with permission from ref . Copyright 2023 Elsevier.…”

Section: Perfluorosulfonic Acid (Pfsa) Polymer Membranesmentioning

confidence: 99%

“…A Nafion nanocomposite membrane having 4 wt % P-COF (Nafion/P-COF-4) showed a proton conductivity of 0.061 S cm −1 at 25 °C under 55% RH and a peak power density of 724 mW cm −2 at 80 °C and 50% RH (Figure 6). 93 Ionic liquids (ILs) have been used to modify PFSA membranes due to their high proton conductivities and excellent thermal and mechanical stabilities. ILs are incorporated into polymer networks using different methods such as casting techniques and polymerization of ionic liquids to prepare solid membranes for PEMFCs.…”

Section: Their Requirementsmentioning

confidence: 99%

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A Critical Review of Electrolytes for Advanced Low- and High-Temperature Polymer Electrolyte Membrane Fuel Cells

Javed

González

Thangadurai

2023

ACS Appl. Mater. Interfaces

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In the 21st century, proton exchange membrane fuel cells (PEMFCs) represent a promising source of power generation due to their high efficiency compared with coal combustion engines and eco-friendly design. Proton exchange membranes (PEMs), being the critical component of PEMFCs, determine their overall performance. Perfluorosulfonic acid (PFSA) based Nafion and nonfluorinated-based polybenzimidazole (PBI) membranes are commonly used for low-and high-temperature PEMFCs, respectively. However, these membranes have some drawbacks such as high cost, fuel crossover, and reduction in proton conductivity at high temperatures for commercialization. Here, we report the requirements of functional properties of PEMs for PEMFCs, the proton conduction mechanism, and the challenges which hinder their commercial adaptation. Recent research efforts have been focused on the modifications of PEMs by composite materials to overcome their drawbacks such as stability and proton conductivity. We discuss some current developments in membranes for PEMFCs with special emphasis on hybrid membranes based on Nafion, PBI, and other nonfluorinated proton conducting membranes prepared through the incorporation of different inorganic, organic, and hybrid fillers.

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Rational Design of Organic Electrocatalysts for Hydrogen and Oxygen Electrocatalytic Applications

Cheng,

He,

et al. 2024

Advanced Materials

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Efficient electrocatalysts are pivotal for advancing green energy conversion technologies. Organic electrocatalysts, as cost‐effective alternatives to noble‐metal benchmarks, have garnered attention. However, the understanding of the relationships between their properties and electrocatalytic activities remains ambiguous. Plenty of research articles regarding low‐cost organic electrocatalysts started to gain momentum in 2010 and have been flourishing recently though, a review article for both entry‐level and experienced researchers in this field is still lacking. This review underscores the urgent need to elucidate the structure‐activity relationship and design suitable electrode structures, leveraging the unique features of organic electrocatalysts like controllability and compatibility for real‐world applications. Organic electrocatalysts are classified into four groups: small molecules, oligomers, polymers, and frameworks, with specific structural and physicochemical properties serving as activity indicators. To unlock the full potential of organic electrocatalysts, five strategies are discussed: integrated structures, surface property modulation, membrane technologies, electrolyte affinity regulation, and addition of anti‐corrosion species, all aimed at enhancing charge efficiency, mass transfer, and long‐term stability during electrocatalytic reactions. The review offers a comprehensive overview of the current state of organic electrocatalysts and their practical applications, bridging the understanding gap and paving the way for future developments of more efficient green energy conversion technologies.This article is protected by copyright. All rights reserved

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High performance nanocomposite proton exchange membranes based on the nanohybrids formed by chemically bonding phosphotungstic acid with covalent organic frameworks

Cited by 37 publications

References 60 publications

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

Hollow Heteropoly Acid-Functionalized ZIF Composite Membrane for Proton Exchange Membrane Fuel Cells

A Critical Review of Electrolytes for Advanced Low- and High-Temperature Polymer Electrolyte Membrane Fuel Cells

Rational Design of Organic Electrocatalysts for Hydrogen and Oxygen Electrocatalytic Applications

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