Hydrogen production by methanol–water solution electrolysis with an alkaline membrane cell

The basic concept of methanol–water solution electrolysis with an alkaline membrane and the experimental studies are presented. The measurements were performed with a membrane electrode assembly consisting of an anion exchange membrane, Pt/C cathode and either PtRu/C or Pt/C anode. Hydrogen production efficiency was measured and the effects of temperature and methanol concentration on the electrolysis performance were investigated. PtRu was found to be a better catalyst at low potentials and the hydrogen was produced with a high efficiency. The results indicate that the favored kinetics and mass transport at high temperatures result in increased hydrogen production. Additionally, it was found that, increasing methanol concentration decreased the performance of the electrolysis as the membrane morphology changes as a function of the concentration.

► The concept of methanol–water solution electrolysis with an alkaline membrane.
► Alkaline environment is an attractive alternative to the conventional electrolysers.
► The system is capable to operate with a high efficiency.
► Increased temperature enhances the hydrogen production.