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Robust Proton Conduction against Mechanical Stress in Flexible Free‐Standing Membrane Composed of Two‐Dimensional Coordination Polymer

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Názov: Robust Proton Conduction against Mechanical Stress in Flexible Free‐Standing Membrane Composed of Two‐Dimensional Coordination Polymer
Autori: Jiangfeng Lu, Yukihiro Yoshida, Kazuyoshi Kanamori, Hiroshi Kitagawa
Prispievatelia: 卢, 江封, 吉田, 幸大, 金森, 主祥, 北川, 宏
Zdroj: Angewandte Chemie. 135
Informácie o vydavateľovi: Wiley, 2023.
Rok vydania: 2023
Predmety: Mechanical Flexibility, Free-Standing Membrane, Proton Conductivity, High Orientation, Porous Coordination Polymer (PCP)
Popis: Introduction of mechanical flexibility into proton‐conducting coordination polymers (CPs) is in high demand for future protonic applications such as fuel cells and hydrogen sensors. Although such mechanical properties have been primarily investigated in one‐dimensional (1D) CPs, in this study, we successfully fabricated highly flexible free‐standing CP membranes with a high surface‐to‐volume ratio, which is beneficial for enhanced performance in the aforementioned applications. We fabricated a layered CP, Cu2(NiTCPP) (H4(H2TCPP); 5,10,15,20‐tetrakis(4‐carboxyphenyl) porphyrin), in which a two‐dimensional (2D) square grid sheet composed of tetradentate nickel porphyrins and paddlewheel‐type copper dimers was connected to each other by weak van der Waals forces. The mechanical flexibility was evaluated by bending and tensile tests. The flexural and Young's moduli of the membrane were significantly higher than those of conventional Nafion membranes. Electrochemical impedance spectroscopy analysis revealed that the in‐plane proton conductivity of the membrane was maintained even under applied bending stress. Because the X‐ray diffraction analysis indicates that the proton‐conducting pathway through the hydrogen bonding network remains intact during the bending operation, our present study provides a promising strategy for the fabrication of new and advanced 2D CPs without using substrates or additional polymers for protonic devices.
Druh dokumentu: Article
Jazyk: English
ISSN: 1521-3757
0044-8249
DOI: 10.1002/ange.202306942
DOI: 10.1002/anie.202306942
Prístupová URL adresa: https://pubmed.ncbi.nlm.nih.gov/37403672
Rights: Wiley Online Library User Agreement
Prístupové číslo: edsair.doi.dedup.....6dbe82a9d7eaffd21bba564b0c52e4d4
Databáza: OpenAIRE
Popis
Abstrakt:Introduction of mechanical flexibility into proton‐conducting coordination polymers (CPs) is in high demand for future protonic applications such as fuel cells and hydrogen sensors. Although such mechanical properties have been primarily investigated in one‐dimensional (1D) CPs, in this study, we successfully fabricated highly flexible free‐standing CP membranes with a high surface‐to‐volume ratio, which is beneficial for enhanced performance in the aforementioned applications. We fabricated a layered CP, Cu2(NiTCPP) (H4(H2TCPP); 5,10,15,20‐tetrakis(4‐carboxyphenyl) porphyrin), in which a two‐dimensional (2D) square grid sheet composed of tetradentate nickel porphyrins and paddlewheel‐type copper dimers was connected to each other by weak van der Waals forces. The mechanical flexibility was evaluated by bending and tensile tests. The flexural and Young's moduli of the membrane were significantly higher than those of conventional Nafion membranes. Electrochemical impedance spectroscopy analysis revealed that the in‐plane proton conductivity of the membrane was maintained even under applied bending stress. Because the X‐ray diffraction analysis indicates that the proton‐conducting pathway through the hydrogen bonding network remains intact during the bending operation, our present study provides a promising strategy for the fabrication of new and advanced 2D CPs without using substrates or additional polymers for protonic devices.
ISSN:15213757
00448249
DOI:10.1002/ange.202306942