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Water electrolyzers
convert direct current electricity into hydrogen gas. Hydrogen gas can store excess
energy which is critical to curbing energy curtailment in intermittent renewable
generation applications. Polymer electrolyte membrane (PEM) electrolyzers suffer from
charge transfer and mass transport losses which result in reduced operating
efficiencies. Insight into the effects of membrane ... read moreelectrode assembly (MEA) design is of
interest to understand these limitations. Using X-ray computed tomography (CT) and
radiography we were able to relate MEA morphological properties with electrolyzer cell
performance. We found the performance of the catalyst coated membrane (CCM) MEA was
superior to the porous transport electrode (PTE) MEA due to a higher interfacial
catalyst connectivity on the anode (rate determining) side. Mass transfer losses were
investigated in the high current density polarization regime. At operating current
densities above 1.5 A/cm2, when oxygen residence in the channels exceeds 65%, mass
transfer losses are dependent on inlet water flow
rate.
Thesis (M.S.)--Tufts University,
2019.
Submitted to the Dept. of Chemical and
Biological Engineering.
Advisor: Iryna
Zenyuk.
Committee: Matthew Panzer, and Ayse
Asatekin.
Keywords: Engineering, and Chemical
engineering.read less
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