Electrochemical hydrogen pumping using a high-temperature polybenzimidazole (PBI) membrane

✍ Scribed by Kelly A. Perry; Glenn A. Eisman; Brian C. Benicewicz

• Book ID: 104024955
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 246 KB
• Volume: 177
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2007.11.059

✦ Synopsis

Electrochemical hydrogen pumping using a high-temperature (>100 • C) polybenzimidazole (PBI) membrane was demonstrated under nonhumidified 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 CO 2 . 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.