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论文类型：期刊论文

发表时间：2012-11-15

发表刊物：JOURNAL OF POWER SOURCES

收录刊物：SCIE、EI、Scopus

卷号：218

页面范围：424-434

ISSN号：0378-7753

关键字：Hydrogen purification; Electrochemical separations; Electrocatalyst coated membranes

摘要：Hydrogen recovery from CO2/H-2 reformate mixtures by selective electrochemical pumping was compared from carbon supported Pt and Pd catalysts. Catalyst coated membranes were prepared by air-brushing a suspension of commercially available 20 wt% Pt/C or 20 wt% Pd/C catalysts and solubilized Nafion in methanol onto Nafion 115 membranes. Electrochemical activity and separation efficiency for the different catalyst layer formulations were evaluated by cyclic voltammetry, polarization and potentiostatic hydrogen pumping. The effective membrane-electrode-assembly (MEA) resistance increased due to dilution of H-2 by CO2; the effective MEA resistance was greater for Pd/C catalysts than for Pt/C catalysts. CO2 adsorbed more strongly to Pd catalysts than Pt catalysts reducing the electrochemical active surface area available for hydrogen oxidation/reduction. Pd/C catalysts had an energy efficiency for hydrogen recovery from reformate mixtures approximately 80% that of Pt catalysts. Because Pd is ten times less costly than Pt the results presented here suggest that Pd/C catalysts would be a promising candidate for hydrogen pumps to recover H-2 from reformate mixtures. (C) 2012 Elsevier B.V. All rights reserved.