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

Soo Jin Kim, Hee Young Park, Sang Hyun Ahn, Byung seok Lee, Hyoung Juhn Kim, Eun Ae Cho, Dirk Henkensmeier, Suk Woo Nam, Sung Hyun Kim, Sung Jong Yoo, Jong Hyun Jang

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4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)348-354
Number of pages7
JournalApplied Catalysis B: Environmental
Volume158-159
DOIs
Publication statusPublished - 2014 Oct

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Keywords

  • Carbon capture and storage
  • Electrochemical hydrogen pump
  • Gas separation
  • Iridium catalyst

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

Kim, S. J., Park, H. Y., Ahn, S. H., Lee, B. S., Kim, H. J., Cho, E. A., Henkensmeier, D., Nam, S. W., Kim, S. H., Yoo, S. J., & Jang, J. H. (2014). Highly active and CO2 tolerant Ir nanocatalysts for H2/CO2 separation in electrochemical hydrogen pumps. Applied Catalysis B: Environmental, 158-159, 348-354. https://doi.org/10.1016/j.apcatb.2014.04.016