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Cobalt Metallopeptide Electrocatalyst for the Selective Reduction of Nitrite to Ammonium
Date
2018-12-12
Author
Guo, Yixing
Stroka, Jesse R.
Kandemir, Banu
Dickerson, Claire E.
Bren, Kara L.
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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A cobalt-tripeptide complex (CoGGH) is developed as an electrocatalyst for the selective six-electron, eight-proton reduction of nitrite to ammonium in aqueous buffer near neutral pH. The onset potential for nitrite reduction occurs at -0.65 V vs Ag/AgCl (1 M KCl). Controlled potential electrolysis at -0.90 V generates ammonium with a faradaic efficiency of 90 +/- 3% and a turnover number of 3550 +/- 420 over 5.5 h. CoGGH also catalyzes the reduction of the proposed intermediates nitric oxide and hydroxylamine to ammonium. These results reveal that a simple metallopeptide is an active functional mimic of the complex enzymes cytochrome c nitrite reductase and siroheme-containing nitrite reductase.
Subject Keywords
Colloid and Surface Chemistry
,
Biochemistry
,
General Chemistry
,
Catalysis
URI
https://hdl.handle.net/11511/68116
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
DOI
https://doi.org/10.1021/jacs.8b09612
Collections
Natural Sciences and Mathematics, Article