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Rational strategies for proton-conductive metal–organic frameworks

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Abstract

Since the transition of energy platforms, proton-conducting materials have played a significant role in broad applications for electrochemical devices. In particular, solid-state proton conductors (SSPCs) are emerging as the electrolyte in fuel cells (FC), a promising power generation technology, because of their high performance and safety for operating in a wide range of temperatures. In recent years, proton-conductive porous metal–organic frameworks (MOFs) exhibiting high proton-conducting properties (>10−2 S cm−1) have been extensively investigated due to their potential application in solid-state electrolytes. Their structural designability, crystallinity, and porosity are beneficial to fabricate a new type of proton conductor, providing a comprehensive conduction mechanism. For the proton-conductive MOFs, each component, such as the metal centres, organic linkers, and pore space, is manipulated by a judicious predesign strategy or post-synthetic modification to improve the mobile proton concentration with an efficient conducting pathway. In this review, we highlight rational design strategies for highly proton-conductive MOFs in terms of MOF components, with representative examples from recent years. Subsequently, we discuss the challenges and future directions for the design of proton-conductive MOFs.

Graphical abstract: Rational strategies for proton-conductive metal–organic frameworks

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Article information


Submitted
04 Jan 2021
First published
19 Apr 2021

Chem. Soc. Rev., 2021, Advance Article
Article type
Review Article

Rational strategies for proton-conductive metal–organic frameworks

D. Lim and H. Kitagawa, Chem. Soc. Rev., 2021, Advance Article , DOI: 10.1039/D1CS00004G

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