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One Model, Two Enzymes: Activation of Hydrogen and Carbon Monoxide
Author(s) -
Ogo Seiji,
Mori Yuki,
Ando Tatsuya,
Matsumoto Takahiro,
Yatabe Takeshi,
Yoon KiSeok,
Hayashi Hideki,
Asano Masashi
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201704864
Subject(s) - carbon monoxide dehydrogenase , carbon monoxide , catalysis , hydrogen , chemistry , hydrogenase , fuel cells , inorganic chemistry , carbon fibers , enzyme , anode , organic chemistry , chemical engineering , materials science , electrode , composite number , engineering , composite material
The ability to catalyze the oxidation of both H 2 and CO in one reaction pot would be a major boon to hydrogen technology since CO is a consistent contaminant of H 2 supplies. Here, we report just such a catalyst, with the ability to catalyze the oxidation of either or both H 2 and CO, based on the pH value. This catalyst is based on a NiIr core that mimics the chemical function of [NiFe]hydrogenase in acidic media (pH 4–7) and carbon monoxide dehydrogenase in basic media (pH 7–10). We have applied this catalyst in a demonstration fuel cell using H 2 , CO, and H 2 /CO (1/1) feeds as fuels for oxidation at the anode. The power density of the fuel cell depends on the pH value in the media of the fuel cell and shows a similar pH dependence in a flask. We have isolated and characterized all intermediates in our proposed catalytic cycles.