Javed Ali, Strauss Ina, Bunzen Hana, Caro Jürgen, Tiemann Michael
Department of Chemistry, Paderborn University, 33098 Paderborn, Germany.
Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, 30167 Hannover, Germany.
Nanomaterials (Basel). 2020 Jun 28;10(7):1263. doi: 10.3390/nano10071263.
Large Co-MOF-74 crystals of a few hundred micrometers were prepared by solvothermal synthesis, and their structure and morphology were characterized by scanning electron microscopy (SEM), IR, and Raman spectroscopy. The hydrothermal stability of the material up to 60 °C at 93% relative humidity was verified by temperature-dependent XRD. Proton conductivity was studied by impedance spectroscopy, using a single crystal. By varying the relative humidity (70-95%), temperature (21-60 °C), and orientation of the crystal relative to the electrical potential, it was found that proton conduction occurs predominantly through the linear, unidirectional (1D) micropore channels of Co-MOF-74, and that water molecules inside the channels are responsible for the proton mobility by a Grotthuss-type mechanism.
通过溶剂热合成制备了几百微米的大尺寸Co-MOF-74晶体，并用扫描电子显微镜（SEM）、红外光谱和拉曼光谱对其结构和形貌进行了表征。通过变温X射线衍射验证了该材料在93%相对湿度下至60°C的水热稳定性。使用单晶通过阻抗谱研究了质子传导率。通过改变相对湿度（70-95%）、温度（21-60°C）以及晶体相对于电势的取向，发现质子传导主要通过Co-MOF-74的线性、单向（1D）微孔通道发生，并且通道内的水分子通过Grotthuss型机制负责质子迁移。
