Creation of Solid-State Protonics in Coordination Compounds

固体质子学是当前备受关注的一个新的研究领域。从发展新的能源和节能技术的角度，包括光伏、储氢和燃料电池技术，该领域最紧迫的课题之一是创造一种新型的质子导体。在这项工作中，我们报道了一种质子导电有机-无机杂化体系，这是一种配位聚合物。这种具有多重氧化还原性质的金属-二聚体体系在金属络合固体中创造新的功能和高性能材料方面具有很大的潜力。我们已经开发了几种质子导体，如图所示的一维、二维和三维配位聚合物。通过复平面阻抗测量，发现所有配位聚合物在室温下都具有很高的质子导电性。其中，H_2dtoaCu具有最高的质子导电性(~10^&lt；-2&gt；S cm~(-1))。这一数值与Nafion相当，Nafion以燃料电池的固体电解液而闻名。详细讨论了质子传导的机理。并对新型高质子导电性配位材料和高浓度储氢纳米材料进行了讨论。

Solid state protonics is a new reseach field attracting much current attention. One of the most urgent subjects in this field is to create a novel proton conductor, from the viewpoint of developing new energy and energy conservation technologies, including photovoltaic, hydrogen storage and fuel cell technologies. In this work, we report on a proton-conductive organic-inorganic hybrid system, which is a coordination polymer. Such a metal-dimer system with multi-redox property has a large potentiality for the creation of new-functional and high-performance materials in metal-complex solids^1.We have developed several kinds of proton conductors, which are 1-D, 2-D as shown in Figure, and 3-D coordination polymers. From the complex-plane impedance measurements, all the coordination polymers were found to be highly proton-conductive at room temperature. Among them, H_2dtoaCu exhibits highest proton conduction (〜 10^<-2> S cm^<-1>). This value is comparable to that of Nafion, which is famous for a solid electrolyte of fuel cell. The mechanism of proton conduction is discussed in detail. New highly proton-conductive coordination materials and highly-concentrated hydrogen-storage nano-materials are also discussed.