A novel thermomechanically stable LaF3-CsH5 (PO4)(2) composite electrolyte with high proton conductivity at elevated temperatures over 150 degrees C

作者：Xiong, Jie; Huang, Yunjie; Li, Jing^*; Ma, Liying; Xu, Guoxiao; Liu, Zhao; Cai, Weiwei^*; Cheng, Hansong

来源：Journal of Energy Chemistry, 2019, 30: 114-120.

DOI：10.1016/j.jechem.2018.04.006

• Intermediate temperature fuel cell
• Hydrogen bond
• Cesium pentahydrogen diphosphate
• Lanthanum fluoride
• Thermomechanical stability

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 center dot center dot center dot F hydrogen bonds with lanthanum fluoride (LaF3). The optimal combination of the LaF3-CPD composite electrolyte is found to be 1:2 in a molar ratio (LaF3-CPD-2). LaF3-CPD-2 composite maintains robust solid state, even at a temperature up to 200 degrees C, which is 50 degrees C higher than the melting temperature of CPD. Meanwhile, the considerable proton conductivity of CPD is achieved in the LaF3-CPD-2 composite electrolyte due to the synergistic effect of the P-OH center dot center dot center dot F hydrogen bonds and the intrinsic proton conductive property of CPD. Last but not least, the LaF3-CPD-2 composite manifests excellent conductivity durability at 150 degrees C and low humidity condition with sizeable proton conductivity of 0.0262 S cm(-1) after 60h operation, implying that the LaF3-CPD composite could be a promising candidate for intermediate temperature proton conductors.

• 出版日期2019-3
• 单位枣庄学院; 中国地质大学（武汉）