Abstract
Proton-conducting materials working under anhydrous or less-humidified atmosphere are significant for improving the energy efficiency of fuel-cell batteries. Here, proton-containing inorganic-organic hybrid crystals were successfully constructed as single crystals with polyoxovanadate cluster and structure-directing surfactants. Decavanadate ([V10O28]6‒, V10) anion having proton affinity was employed to hybridize with alkyltrimethylammonium ([CnH2n+1N(CH3)3]+, Cn (n = 12, 14, 16)) cations. All the hybrid crystals were homologues composed from alternate stacking of V10 monolayers and Cn interdigitated bilayers. Inside the V10 monolayers, diprotonated V10 anions were arranged to form one-dimensional infinite chains connected through O‒H•••O hydrogen bonds. These hybrid crystals exhibited anhydrous proton conductivity at intermediate temperatures (373‒433 K (100‒160 °C)). A moderate anhydrous conductivity of 2.9 × 10–4 S cm–1 was observed for C16-V10 hybrid crystals at 373 K (100 °C).
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