Abstract
Rare metal-organic framework (MOF) minerals stepanovite and zhemchuzhnikovite can exhibit properties comparable to known oxalate MOF proton conductors, including high proton conductivity over a range of relative humidities at 25 °C, and retention of the framework structure upon thermal dehydration. They also have high thermodynamic stability, with a pronounced stabilizing effect of substituting aluminium for iron, illustrating a simple design to access stable, highly proton-conductive MOFs without using complex organic ligands.
Highlights
Whereas most minerals are inorganic solids,[1] recent work highlighted complex organic or metal–organic structures of minerals found in unusual or extreme environments.[2]
We have shown that metal–organic framework (MOF) minerals zhemchuzhnikovite and stepanovite can exhibit high proton conductivity, enabled by hydrogen-bonding networks involving interstitial water molecules, hydrated metal cation guests and the oxalate based-framework
We report the possibility of polymorphism in stepanovite, which enabled observing the effect of hydrogen-bonded framework topology on proton conductivity of an oxalate-based MOF
Summary
Whereas most minerals are inorganic solids,[1] recent work highlighted complex organic or metal–organic structures of minerals found in unusual or extreme environments.[2]. Synthetic mineral analogues exhibit high proton conductivities at room temperature, undergo thermal removal of included water guests without changes to the underlying hcbnetworks and, by using solution calorimetry, we demonstrate they are of high thermodynamic stability. Variable temperature (VT) dehydration experiments and veri cation a er impedance measurements were performed on a Bruker
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