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

다국어 초록 (Multilingual Abstract)

We investigated the effects of hydrogen separation using high-temperature anhydrous proton-exchangemembrane fuel-cell technology. Various acid-doped para-polybenzimidazole (p-PBI)-chain end-tetheredamine-polyhedral oligomeric silsesquioxane (NH2-POSS) membranes were prepared via a unique sol–geltransition method termed as the poly(phosphoric acid) process. The resulting NH2-POSS-capped p-PBImembranes exhibited a higher phosphoric acid-doping level (128–223.5%) and proton conductivity(0.23–0.29 S cm 1 at 160 C and 0% relative humidity) than the parent p-PBI membrane. The chemicalchain end-termination of p-PBI with cage-like NH2-POSS significantly enhanced the electrochemicalH2/CO2 and H2/CO separation at 160 C. The hydrogen separation of the NH2-POSS-capped p-PBI systemrequired a relatively small amount of energy, and the system exhibited a good dynamic response. Thefavorable interfacial interaction between the NH2-POSS and the p-PBI host, high thermomechanicalstability, and good fuel-cell and hydrogen-separation performance at high temperatures up to 160 Cindicate the applicability of the NH2-POSS-capped p-PBI membranes to electrochemical powergeneration and hydrogen pumps for practical industrial applications in harsh and extreme environments.

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