Proton
Transport through Robust CPO-27-type Metal
Organic Frameworks
- Publication date
- Publisher
Abstract
In this work we studied the robustness
of Ni-CPO-27 and Mg-CPO-27
metal organic frameworks (MOFs) upon cold uniaxial pressing and thermal
cycling in dry and wet Ar/H<sub>2</sub>. The preparation and operation
limits for each material are found to be 225 and 150 MPa and temperatures
of 250 and 150 °C for Ni-CPO-27 and Mg-CPO-27, respectively.
The electrochemical alternating current conductivity measurements
performed as high as 250 °C showed conductivity values ranging
from 10<sup>–6</sup> to 10<sup>–8</sup> S/cm, depending
on the material, temperature, and atmosphere. The protonic nature
of the electrochemical transport phenomena was unambiguously confirmed
via proton/deuteron isotopic and transient hydration studies. The
study reveals high reproducibility and stability of the electrochemical
measurements upon cycling in different atmospheres. Meanwhile, the
crystallinity of the sample was preserved after the conductivity study
and three weeks on stream, which demonstrates the midterm stability
and robustness of this MOF