Abstract
Membrane-electrode assemblies (MEAs) were developed for the gas-phase Hybrid Sulfur electrolyzer, and the addition of a low-permeability anode prelayer (LPAP) significantly reduced the observed SO2 crossover rate under nominal 25-cm² electrolyzer operating conditions vs. untreated controls utilizing the same base membrane. An 80-cm² bipolar electrolyzer stack having common fluid manifolds was designed and fabricated. Preliminary stack testing indicates similar performance and efficiency to the small, single-cell electrolyzer, but that some corrosion was observed in the anolyte paths of the graphite composite bipolar plates. Follow-up experiments are discussed.
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