Effect of Elevated Temperatures on the States of Water and Their Correlation with the Proton Conductivity of Nafion.

ABSTRACT: For the first time, we report the effects of elevated temperatures, from 80 to 100 °C, on the changes in the states of water and ion-water channels and their correlation with the proton conductivity of Nafion NR212, which was investigated using a Fourier transform infrared spectroscopy study. Experimentally, three types of water aggregates, protonated water (H⁺(H₂O) _n ), nonprotonated hydrogen (H)-bonded water (H₂O···H₂O), and non-H-bonded water, were found in Nafion, and the existence of those three types of water was confirmed through ab initio molecular dynamics simulation. We found that the proton conductivity of Nafion increased for up to 80 °C, but from 80 to 100 °C, the conductivity did not increase; rather, all of those

SUBMITTER: Barique MA 

PROVIDER: S-EPMC6641407 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature