Journal ArticleDOI
Post-synthetic modification of porous materials: superprotonic conductivities and membrane applications in fuel cells
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TLDR
In this article, a review of post-synthetic modification-based proton conductors and their membranes in terms of design strategies, conduction mechanisms, and diverse diagnostic modalities for future electrolyte materials in fuel cell technology is presented.Abstract:
Proton exchange membrane fuel cells (PEMFCs) have attracted considerable attention and applications in the field of transportation because they achieve eco-friendly electricity generation with water as the only by-product. As the preferred solid electrolyte in PEMFCs, Nafion possesses various desirable attributes and high proton conductivity, but its prohibitive cost and practical limitations in operation are problematic. Recently, several types of porous platforms, including metal–organic frameworks (MOFs), covalent organic frameworks (COFs), porous organic polymers (POPs), and hydrogen-bonded organic frameworks (HOFs) have been deployed to develop conducting systems. Post-synthetic modification for porous platforms is a flagship smart methodology in membrane electrolyte fabrication for fuel cells that concurrently combines original and other desirable features that are complementary to each other and induce enhanced conductivity. Additionally, the introduction of proton conductive mixed matrix membranes, which has recently received considerable attention as a practical method to fabricate membranes, has inspired recent research trends. This review discusses post-synthetic modification-based proton conductors and their membranes in terms of design strategies, conduction mechanisms, and diverse diagnostic modalities for future electrolyte materials in fuel cell technology.read more
Citations
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Journal ArticleDOI
Positive Cooperative Protonation of a Metal-Organic Framework: pH-Responsive Fluorescence and Proton Conduction.
TL;DR: In this article, the first demonstration of positive cooperative protonation of a MOF and the relevant pH response in fluorescence and proton conduction was reported. But the work focused on the development of responsive fluorescent MOFs and not on the potential binding cooperativity of sensory MOFs.
Journal ArticleDOI
Proton conductive Zr-based MOFs
TL;DR: In this article, the proton conductivity properties of Zr-based metal-organic frameworks (MOFs) with ordered porous structures, outstanding thermal stability, remarkably high water stability and chemical stability are reviewed.
Journal ArticleDOI
Emerging Porous Materials and Their Composites for NH3 Gas Removal.
TL;DR: Recent progress in the development of porous NH3 adsorbents is summarized and factors affecting NH3 capture are analyzed to provide a reasonable strategy for the design and synthesis of promising materials for NH3 abatement.
Journal ArticleDOI
Proton-Conducting Hydrogen-Bonded Organic Frameworks
TL;DR: In this article, solid-state proton-conducting materials play essential roles in various electrochemical devices, including fuel cells as solid electrolytes, including hydrogen-bonded organic frameworks.
Journal ArticleDOI
Proton conductive metal sulfonate frameworks
TL;DR: In this article, the relationship of structures and proton conducting properties on sulfonate-based MOFs is discussed and a review of the opportunities and challenges are proposed and highlighted.
References
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Journal ArticleDOI
Carbon Dioxide Capture in Metal–Organic Frameworks
Kenji Sumida,David L. Rogow,Jarad A. Mason,Thomas M. McDonald,Eric D. Bloch,Zoey R. Herm,Tae-Hyun Bae,Jeffrey R. Long +7 more
TL;DR: Kenji Sumida, David L. Rogow, Jarad A. Mason, Thomas M. McDonald, Eric D. Bloch, Zoey R. Herm, Tae-Hyun Bae, Jeffrey R. Long
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State of Understanding of Nafion
TL;DR: Light scattering experiments revealed that the radius of gyration had a linear dependence on the molar mass of the aggregates, which suggests that the particles are in the form of rods or ribbons, or at least some elongated structure.
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The Grotthuss mechanism
TL;DR: In this paper, it is suggested that the molecular mechanism behind prototropic mobility involves a periodic series of isomerizations between H 9 O 4 + and H 5 O 2 +, the first trigerred by hyrdogen-bond cleavage of a second-shell water molecule and the second by the reverse, hydrogen-bonder formation process.
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Metal–Organic Frameworks (MOFs)
TL;DR: The supercapacitor, the electric double-layer capacitor, and the so-called "reduction and oxidation, redox" technology are all being developed.
Journal ArticleDOI
Applications of metal–organic frameworks in heterogeneous supramolecular catalysis
TL;DR: This review summarizes the use of metal-organic frameworks (MOFs) as a versatile supramolecular platform to develop heterogeneous catalysts for a variety of organic reactions, especially for liquid-phase reactions.