A facile strategy is introduced to upgrade thermomechanical stability of the cesium pentahydrogen diphosphate(CPD), which is the most efficient inorganic electrolyte among all solid proton conductors,by constructing P...A facile strategy is introduced to upgrade thermomechanical stability of the cesium pentahydrogen diphosphate(CPD), which is the most efficient inorganic electrolyte among all solid proton conductors,by constructing P–OH···F hydrogen bonds with lanthanum fluoride(LaF_3). The optimal combination of the LaF_3–CPD composite electrolyte is found to be 1:2 in a molar ratio(LaF_3–CPD-2). LaF_3–CPD-2 composite maintains robust solid state, even at a temperature up to 200 °C, which is 50 °C higher than the melting temperature of CPD. Meanwhile, the considerable proton conductivity of CPD is achieved in the LaF_3–CPD-2 composite electrolyte due to the synergistic effect of the P–OH···F hydrogen bonds and the intrinsic proton conductive property of CPD. Last but not least, the LaF_3–CPD-2 composite manifests excellent conductivity durability at 150 °C and low humidity condition with sizeable proton conductivity of0.0262 S cm^(-1) after 60 h operation, implying that the LaF_3–CPD composite could be a promising candidate for intermediate temperature proton conductors.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21703211,21503197 and 21473164)Fundamental Research Funds for the Central University,China University of Geosciences(Wuhan)(Nos.CUG150615 and CUG150627)
文摘A facile strategy is introduced to upgrade thermomechanical stability of the cesium pentahydrogen diphosphate(CPD), which is the most efficient inorganic electrolyte among all solid proton conductors,by constructing P–OH···F hydrogen bonds with lanthanum fluoride(LaF_3). The optimal combination of the LaF_3–CPD composite electrolyte is found to be 1:2 in a molar ratio(LaF_3–CPD-2). LaF_3–CPD-2 composite maintains robust solid state, even at a temperature up to 200 °C, which is 50 °C higher than the melting temperature of CPD. Meanwhile, the considerable proton conductivity of CPD is achieved in the LaF_3–CPD-2 composite electrolyte due to the synergistic effect of the P–OH···F hydrogen bonds and the intrinsic proton conductive property of CPD. Last but not least, the LaF_3–CPD-2 composite manifests excellent conductivity durability at 150 °C and low humidity condition with sizeable proton conductivity of0.0262 S cm^(-1) after 60 h operation, implying that the LaF_3–CPD composite could be a promising candidate for intermediate temperature proton conductors.
