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. 2007 Aug 29;129(34):10328-9.
doi: 10.1021/ja073643o. Epub 2007 Aug 2.

Rapid and efficient electrocatalytic CO2/CO interconversions by Carboxydothermus hydrogenoformans CO dehydrogenase I on an electrode

Alison Parkin  1 , Javier Seravalli, Kylie A Vincent, Stephen W Ragsdale, Fraser A Armstrong
Affiliations

Rapid and efficient electrocatalytic CO2/CO interconversions by Carboxydothermus hydrogenoformans CO dehydrogenase I on an electrode

Alison Parkin et al. J Am Chem Soc. .
No abstract available

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Figures

Figure 1
Figure 1
Structure of Ch CODH II showing the two subunits (blue and gray) and arrangement of Fe–S clusters (black) that relay electrons to and from the [Ni4Fe-5S] active sites (red). Inset shows the [Ni4Fe-5S] cluster where the proposed binding site for CO on the Ni atom is shown as *.
Figure 2
Figure 2
Protein film voltammograms showing CO2 reduction and CO oxidation activities of Ch CODH I under atmospheres of 100% CO2, 100% CO, or 1:1 CO2/CO gas mixtures. Scan rate in panels a, c, and d was 10 mV/s; in panel b the scan rate was 30 mV/s. The electrode rotation was 4000 rpm. The pH is as indicated and the temperature color scheme given in panel a is used in other panels. Buffer compositions are given in ref 12. Electroactive coverage varies between different experiments.
Figure 3
Figure 3
Observations of Ch Ni-CODH I activity at high potential, changing: (a) scan rate, (b) temperature, (c) pH, and (d) CO. Unless stated otherwise, conditions are 0.7 mV/s, 100% CO, rotation rate of 4000 rpm, pH 5.0, 50 °C. In panels a and b the current is normalized with respect to the maximum oxidation current. In panels c and d black vertical arrows indicate resolution of two activation processes. Where a large amount of CO is oxidized, sufficient CO2 accumulates to be detected as a reduction current. It is clear that complete inactivation is not achieved even at 1% CO.
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References

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