Highly active and CO2 tolerant Ir nanocatalysts for H2/CO2 separationin electrochemical hydrogen pumps

Title
Highly active and CO2 tolerant Ir nanocatalysts for H2/CO2 separationin electrochemical hydrogen pumps
Authors
김수진박희영안상현이병석김형준조은애헨켄스마이어디억남석우김성현유성종장종현
Keywords
electrochemical hydrogen pump; gas separation; carbon capture and storage; iridium catalyst; CO2 stripping
Issue Date
2014-10
Publisher
Applied catalysis B, Environmental
Citation
VOL 158-159, 348-354
Abstract
Carbon-supported Pt nanoparticles have been widely used as electrocatalysts for electrochemical hydrogen pumps. However, Pt surfaces are susceptible to poisoning under CO2 atmosphere, and as a result, need greater applied cell voltages. Instead of Pt as an anode catalyst in electrochemical hydrogen pumps, we synthesized Ir-based catalysts and characterized them by XRD, XPS, TEM, and TGA. The electrochemical characteristics of the Ir catalysts were evaluated by a halfcell test, and their catalytic activities toward the hydrogen oxidation and hydrogen evolution reactions were evaluated by micro polarization analysis. The exchange current density of the Ir catalyst that was heat treated at 300 °C was larger than that of commercial Pt. CO2 stripping analysis confirmed that the Ir catalyst was not affected by CO2, unlike the Pt catalyst. Focusing on H2 separation from H2/CO2 gas, an evaluation using a single-cell test indicated that the Ir catalyst performed better than the Pt catalyst.
URI
http://pubs.kist.re.kr/handle/201004/48183
ISSN
09263373
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KIST Publication > Article
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