Multivariate Synergistic Flexible Metal‐Organic Frameworks with Superproton Conductivity for Direct Methanol Fuel Cells

Improving proton conductivity and fabricating viable metal‐organic frameworks (MOFs) based proton exchange membranes (PEMs) are central issues exploiting electrolyte MOFs. We aim to design multivariate flexibility synergistic strategy to achieve Flexible MOFs (FMOFs) with high conductivity at a wide...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-12, Vol.60 (51), p.26577-26581
Main Authors: Li, Zhen‐Hua, Zeng, Hui, Zeng, Guang, Ru, Chunyu, Li, Guanghua, Yan, Wenfu, Shi, Zhan, Feng, Shouhua
Format: Article
Language:English
Subjects:
Conductivity
direct methanol fuel cells
Electrodes
Electrolytic cells
Fourier transforms
Fuel cells
Fuel technology
hydrogen-bonding
Infrared spectra
Membranes
Metal-organic frameworks
Methanol
Multivariate analysis
multivariate FMOFs
proton conductivity
Protons
Sulfonic acid
synergistic self-adaption
Temperature dependence
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Summary:Improving proton conductivity and fabricating viable metal‐organic frameworks (MOFs) based proton exchange membranes (PEMs) are central issues exploiting electrolyte MOFs. We aim to design multivariate flexibility synergistic strategy to achieve Flexible MOFs (FMOFs) with high conductivity at a wide range of humidity. In situ powder X‐ray diffraction (PXRD) and temperature‐dependent Fourier transform infrared spectra (FT‐IR) prove the synergistic self‐adaption between dynamic torsion of alkyl sulfonic acid and dynamic breathing of FMOF, forming a continuous hydrogen‐bonding networks to maintain high conductivity. Based on the convincing proton conductivity, we construct a series of long‐term durable MOF‐based PEMs that serve as a bridge between MOF and fuel cell. Consequently, the membrane electrode assembly (MEA) of the flexible PMNS1‐40 exhibits a maximum single‐cell power density of 34.76 mW cm−2 and hopefully opens doors to evaluate the practical application of proton‐conducting MOFs in direct methanol fuel cells. Multivariate flexible MOF facilitates efficient hydrogen‐bonding formation by synergistic self‐adapting its flexible structure, maintaining excellent proton conductivity. Based on compelling proton conductivity, a single‐cell of MOF‐based PEMs with long‐term durability is assembled and exhibits excellent power density, which is promising for the practical application of proton‐conducting MOFs in DMFCs.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202112922