Electrochemical hydrogen pumping using a high-temperature polybenzimidazole (PBI) membrane |
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Authors: | Kelly A. Perry Glenn A. Eisman Brian C. Benicewicz |
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Affiliation: | 1. Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA;2. Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA |
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Abstract: | Electrochemical hydrogen pumping using a high-temperature (>100 °C) polybenzimidazole (PBI) membrane was demonstrated under non-humidified and humidified conditions at ambient pressures. Relatively low voltages were required to operate the pump over a wide range of hydrogen flow rates. The advantages of the high-temperature capability were shown by operating the pump on reformate feed gas mixtures containing various amounts of CO and CO2. Gas purity measurements on the cathode gas product were conducted and significant reductions in gas impurities were detected. The applicability of the PBI membrane for electrochemical hydrogen pumping and its durability under typical operating conditions were established with tests that lasted for nearly 4000 h. |
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Keywords: | Hydrogen pump, separation, and purification High-temperature proton exchange membrane (PEM) Phosphoric acid-doped polybenzimidazole (PBI) |
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