Construction and Comparative Research of Two MOFs Proton Conducting Materials Containing Nitro Groups

• Published in: Chemistry : a European journal Vol. 31; no. 3; pp. e202403296 - n/a
• Main Authors: Guo, Yuan‐Yuan, Wang, Rui‐Dong, Zhao, Xu‐Hui, Lv, Hong‐Bo, Wei, Wei‐Ming, Wang, Lei, Zhang, Suo‐Shu, Du, Lin, Zhao, Qi‐Hua
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 14.01.2025
• Subjects: Antifungal agents; Cadmium; CD3 antigen; Conduction; Conductivity; Electrochemistry; Ethene; Ethylene; Imidazole; Metal-organic frameworks; Nitrates; Nitro groups; Proton conduction; Proton conductivity; Synthesis; Synthesis and structure; Water absorption; Water vapor; Nitro groups; Proton conductivity; Synthesis and structure
• ISSN: 0947-6539; 1521-3765; 1521-3765
• DOI: 10.1002/chem.202403296

In field of electrochemistry, there has been a growing interest in the potential applications of proton‐conducting metal‐organic frameworks (MOFs). Therefore, how to design and synthesize MOFs with high proton conductivity is considered crucial. In this study, two examples of nitro‐containing Cd‐based MOFs, MOF‐1 {[Cd3(TIPE)1.5(NO3)5Cl(H2O)2] ⋅ 17H2O}n and MOF‐2 {[Cd(TIPE)0.5(nip)] ⋅ 10H2O}n (TIPE=1,1,2,2‐tetrakis(4‐(1H‐imidazole‐1‐yl)phenyl)ethene, H2nip=5‐Nitroisophthalic Acid), had been successfully designed and synthesized, and their proton‐conducting properties were thoroughly investigated. Notably, both materials displayed peak proton conductivity at 98 % RH and 90 °C, exhibiting values of 9.13×10−3 and 3.00×10−3 S cm−1 for MOF‐1 and MOF‐2, respectively. The plausible proton conduction pathways and mechanisms were elucidated through structural analyses, water vapor adsorption studies, and the determination of activation energy (Ea) values. It was found that the difference in proton conductivity between MOF‐1 and MOF‐2 was mainly associated with the different water absorption rates of the samples. The uniqueness of this study was that for the first time conducted an in‐depth study of the role of nitrate in proton conduction, providing new ideas for designing materials with excellent proton conductivity. Two nitro‐containing Cd‐based MOFs, MOF‐1 and MOF‐2, are being synthesized and investigated for their proton conductivity. Both materials show peak conductivity at 98% RH and 90 °C, with MOF‐1 demonstrating significantly higher proton conductivity (9.13 × 10−3 S⋅cm−1) compared to MOF‐2 (3.00×10−3 S⋅cm−1). The study emphasizes the role of nitrate in enhancing proton conduction.