Effect of PBI-HFA surface treatments on Pd/PBI-HFA composite gas separation membranes |
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Authors: | Da Hye Kim Seong Young Kong Geun-Hyuk Lee Chang Won Yoon Hyung Chul Ham Jonghee Han Kwang Ho Song Dirk Henkensmeier Sun Hee Choi |
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Affiliation: | 1. Fuel Cell Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul 02792, Republic of Korea;2. Green School, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea;3. Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul 02792, Republic of Korea;4. Department of Clean Energy and Chemical Engineering, Korea University of Science and Technology, Republic of Korea;5. Department of Converging Science and Technology, KHU-KIST Graduate School, Kyunghee University, South Korea;6. Department of Energy and Environmental Engineering, University of Science and Technology, Republic of Korea |
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Abstract: | For pure hydrogen separation, palladium was deposited on surface-treated polybenzimidazole (PBI-HFA, 4,4′-(hexafluroisopropylidene)bis(benzoic acid)) via the vacuum electroless plating technique (VELP). Since the hydrophobic characteristics of the polymer surface restrict strong adhesion of Pd on it and cause the peel-off of Pd film, various surface treatments have been employed. To increase the number of Pd anchoring sites on the PBI-HFA surface, mechanical abrasion (polishing) was applied, and to increase the hydrophilicity of the PBI-HFA surface, wet-chemical and O2 plasma treatment (dry etching) were used. The thickness and effective permeating area of the deposited Pd films on the PBI-HFA membranes were estimated to be in the range of 160–340 nm and 8.3 cm2, respectively. Among the tested membranes, membranes with Pd layers deposited on O2 plasma treated PBI-HFA surfaces had the most uniform microstructure and the least number of defects compared to the other membranes. Gas permeation experiments were performed as a function of temperature and pressure. The gases used in the permeation measurements were H2, N2, CO2, and CO (99.9% purity). A Pd-O230 m membrane, fabricated by O2 plasma surface treatment during 30 min, exhibited superior gas separation performance (H2 permeability of 275.5 Barrer), and proved to be impermeable to carbon monoxide. Enhancement of H2 permselectivity of Pd/PBI-HFA composite membrane treated by O2 plasma shows promising hydrogen separation membrane. |
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Keywords: | Hydrogen separation Polybenzimidazole (PBI-HFA) Pd composite membrane Vacuum electroless plating (VELP) Chemical etching CELP Conventional electroless plating CVD chemical vapor deposition ELP electroless plating HFA 4,4′-(hexafluroisopropylidene)bis(benzoic acid) PBI polybenzimidazole PSA pressure swing adsorption VELP vacuum electroless plating technique |
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