Chain end-termination of p-polybenzimidazole by bulk segment for efficient electrochemical power generation and hydrogen separation

摘要: Abstract We investigated the effects of hydrogen separation using high-temperature anhydrous proton-exchange membrane fuel-cell technology. Various acid-doped para-polybenzimidazole (p-PBI)-chain end-tethered amine-polyhedral oligomeric silsesquioxane (NH2-POSS) membranes were prepared via a unique sol–gel transition method termed as poly(phosphoric acid) process. The resulting NH2-POSS-capped p-PBI exhibited higher phosphoric acid-doping level (128–223.5%) and proton conductivity (0.23–0.29 S cm−1 at 160 °C 0% relative humidity) than parent membrane. chemical chain end-termination with cage-like NH2-POSS significantly enhanced electrochemical H2/CO2 H2/CO 160 °C. system required relatively small amount energy, good dynamic response. favorable interfacial interaction between host, high thermomechanical stability, hydrogen-separation performance temperatures up to indicate applicability power generation pumps for practical industrial applications in harsh extreme environments.