Preparation of intermediate-temperature proton conducting materials utilizing reaction of phosphate glass and organic molecules

利用偏磷酸锌玻璃粉与苯并咪唑（BIm）反应制备了一种中温质子导电非晶材料。在200℃加热后，无水材料的重量几乎没有下降。在170 ~ 230℃的中间温度下，其电导率为10 ~ 100 pS-cml，电导活化能（~1.0 eV）大于质子在苯并咪唑分子间传递的活化能。为了提高电导率，将表面带有可移动质子的纳米磷酸锆颗粒与非晶材料杂化。所得材料的电导率比杂化前提高了2个数量级，活化能较小，为~16 kJ/mol。核磁共振分析表明，纳米颗粒表面周围的氢键强度和可移动质子的数量增加。使用该材料作为电解液的MEA（膜电极组装）在150℃的H2/02燃料电池中工作时，最大功率密度为111 mW cm'。

An intermediate-temperature proton-conducting amorphous material was prepared utilizing the reaction of zinc metaphosphate glass powders with benzimidazole (BIm). The anhydrous material showed almost no decrease in weight even after heating at 200℃. It showed electrical conductivities of 10-100 pS-cml at the intermediate temperatures of 170-230℃: the activation energy for electrical conduction (~1.0 eV) was larger than that for proton transport between benzimidazole molecules. For improving the electrical conductivities, nanometer-sized zirconium phosphate particles with mobile protons at their surface were hybridized with the amorphous materials. The resulting materials showed two-order magnitude larger conductivities than those before hybridization, and small activation energy of ~16 kJ/mol. NMR analysis implied that the strength of hydrogen bonding and the amount of mobile protons increased at around the surface of the nano-particles. MEA (membrane-electrode-assembly) using the material as the electrolyte worked with a maximum power density of 111 mW cm' when utilized in an H2/02 fuel cell at 150℃.