We demonstrate for the first time a fully anhydrous gas-phase hydrogen chloride electrolyzer. By taking advantage of polybenzimidazole's (PBI) low membrane resistivity in anhydrous conditions (0.87 +/- 0.57 11-cm2 at 160 degrees C) and its temperature and acid environment stability, we are able to directly convert pure hydrogen chloride gas to dry hydrogen and dry chlorine at efficiencies nearing 100 at an electrolyzer temperature of 160 degrees C and electrolyzer potential of 1.8 V. Finally, we discuss steps to further improve this electrolysis process in terms of both electrolyzer performance and cost reduction.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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