An ultra-stable hafnium phosphonate MOF platform for comparing the proton conductivity of various guest molecules/ions
Yan Huang, Fan Zhou, Jian‐Shen Feng, Hongxia Zhao, Chao Qi, Jinyan Ji, Song‐Song Bao, Tao Zheng
Abstract
A porous hafnium-phosphonate MOF was synthesized using imidazole ionic liquids (ILs), namely PHOS-100(Hf), which has exceptional chemical stability in aqueous environments, even fuming acids. Its rigid framework with permanent porosity makes PHOS-100 an ideal candidate as a platform to fill with different functional guests such as acidic HCl, H2SO4, or H3PO4. The as-synthesized ILs@PHOS-100 exhibits significant humidity-dependent proton conductivities, increasing by four orders of magnitude from 45% RH to 95% RH at 25 °C. After post-treatment with strong acids, the acids@PHOS-100 show enhanced proton conduction at low relative humidities.
Topics & Concepts
PhosphonateHafniumIonMoleculeConductivityProtonChemistryCluster (spacecraft)Materials scienceChemical physicsCrystallographyInorganic chemistryPhysical chemistryOrganic chemistryZirconiumComputer sciencePhysicsQuantum mechanicsProgramming languageMetal-Organic Frameworks: Synthesis and ApplicationsMXene and MAX Phase MaterialsAdvancements in Battery Materials