Potential application of iridium as catalyst in fuel cells: Ammonia decomposition on Ir surfaces

Wenhua Chen, Ivan Ermanoski, Theodore E. Madey

Research output: Contribution to journalConference article

Abstract

The adsorption and decomposition of NH3 and hydrogen on clean planar Ir(210) and on clean nanoscale-faceted Ir(210) were studied. Nanoscale facets developed on the initially planar Ir(210) surface when it was covered with oxygen and annealed at ≥ 600K. Ir(210) was very active for NH3 decomposition and the recombinative nitrogen desorption peak temperature was much lower compared to other transition metals. Striking differences were observed in recombination and desorption of molecular hydrogen, and in thermal decomposition of NH3 over clean faceted Ir(210) vs. clean planar Ir(210). NH3 decomposition on Ir(210) exhibited size effects on the nanometer scale. Ir might be a useful catalyst component for COx-free hydrogen production for potential fuel cell applications. Faceted Ir(210) is an excellent model catalyst for exploring structure sensitivity and size effects in surface chemistry. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
Volume228
Issue number1
StatePublished - Jan 1 2004
Externally publishedYes
EventAbstracts of Papers - 228th ACS National Meeting - Philadelphia, PA, United States
Duration: Aug 22 2004Aug 26 2004

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Iridium
Ammonia
Fuel cells
Decomposition
Catalysts
Hydrogen
Desorption
Hydrogen production
Surface chemistry
Transition metals
Pyrolysis
Nitrogen
Oxygen
Adsorption
Temperature

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Potential application of iridium as catalyst in fuel cells : Ammonia decomposition on Ir surfaces. / Chen, Wenhua; Ermanoski, Ivan; Madey, Theodore E.

In: ACS National Meeting Book of Abstracts, Vol. 228, No. 1, 01.01.2004.

Research output: Contribution to journalConference article

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abstract = "The adsorption and decomposition of NH3 and hydrogen on clean planar Ir(210) and on clean nanoscale-faceted Ir(210) were studied. Nanoscale facets developed on the initially planar Ir(210) surface when it was covered with oxygen and annealed at ≥ 600K. Ir(210) was very active for NH3 decomposition and the recombinative nitrogen desorption peak temperature was much lower compared to other transition metals. Striking differences were observed in recombination and desorption of molecular hydrogen, and in thermal decomposition of NH3 over clean faceted Ir(210) vs. clean planar Ir(210). NH3 decomposition on Ir(210) exhibited size effects on the nanometer scale. Ir might be a useful catalyst component for COx-free hydrogen production for potential fuel cell applications. Faceted Ir(210) is an excellent model catalyst for exploring structure sensitivity and size effects in surface chemistry. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).",
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N2 - The adsorption and decomposition of NH3 and hydrogen on clean planar Ir(210) and on clean nanoscale-faceted Ir(210) were studied. Nanoscale facets developed on the initially planar Ir(210) surface when it was covered with oxygen and annealed at ≥ 600K. Ir(210) was very active for NH3 decomposition and the recombinative nitrogen desorption peak temperature was much lower compared to other transition metals. Striking differences were observed in recombination and desorption of molecular hydrogen, and in thermal decomposition of NH3 over clean faceted Ir(210) vs. clean planar Ir(210). NH3 decomposition on Ir(210) exhibited size effects on the nanometer scale. Ir might be a useful catalyst component for COx-free hydrogen production for potential fuel cell applications. Faceted Ir(210) is an excellent model catalyst for exploring structure sensitivity and size effects in surface chemistry. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).

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