Cobalt Metallopeptide Electrocatalyst for the Selective Reduction of Nitrite to AmmoniumClick to copy article linkArticle link copied!
- Yixing GuoYixing GuoDepartment of Chemistry, University of Rochester, Rochester, New York 14627-0216, United StatesMore by Yixing Guo
- Jesse R. StrokaJesse R. StrokaDepartment of Chemistry, University of Rochester, Rochester, New York 14627-0216, United StatesMore by Jesse R. Stroka
- Banu KandemirBanu KandemirDepartment of Chemistry, University of Rochester, Rochester, New York 14627-0216, United StatesDepartment of Chemistry, Middle East Technical University, North Cyprus via Mersin 10, TurkeyMore by Banu Kandemir
- Claire E. DickersonClaire E. DickersonDepartment of Chemistry, University of Rochester, Rochester, New York 14627-0216, United StatesMore by Claire E. Dickerson
- Kara L. Bren*Kara L. Bren*[email protected]Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United StatesMore by Kara L. Bren
Abstract

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.
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