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A nickel (II) PY5 complex as an electrocatalyst for water oxidation
KTH Royal Inst Technol, Dept Chem, S-10044 Stockholm, Sweden..
KTH Royal Inst Technol, Dept Chem, S-10044 Stockholm, Sweden..
KTH Royal Inst Technol, Dept Chem, S-10044 Stockholm, Sweden..
KTH Royal Inst Technol, Dept Chem, S-10044 Stockholm, Sweden..
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2016 (English)In: Journal of Catalysis, ISSN 0021-9517, E-ISSN 1090-2694, Vol. 335, 72-78 p.Article in journal (Refereed) Published
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Abstract [en]

A Ni-PY5 [PY5 = 2,6-bis(1,1-bis(2-pyridyl)ethyl)pyridine)] complex has been found to act as an electrocatalyst for oxidizing water to dioxygen in aqueous phosphate buffer solutions. The rate of water oxidation catalyzed by the Ni-PY5 is remarkably enhanced by the proton acceptor base HPO42-, with rate constant of 1820 M-1 s(-1). Controlled potential bulk electrolysis with Ni-PY5 at pH 10.8 under an applied potential of 1.5 V vs. normal hydrogen electrode (NHE) resulted in dioxygen formation with a high faradaic efficiency over 90%. A detailed mechanistic study identifies the water nucleophilic attack pathway for water oxidation catalysis.

Place, publisher, year, edition, pages
2016. Vol. 335, 72-78 p.
Keyword [en]
Nickel complex, Water oxidation catalyst, Electrochemistry, Water nucleophilic attack
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-282298DOI: 10.1016/j.jcat.2015.12.003ISI: 000371098200007OAI: oai:DiVA.org:uu-282298DiVA: diva2:916878
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Energy Agency
Available from: 2016-04-05 Created: 2016-04-05 Last updated: 2017-11-30Bibliographically approved

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Das, BiswanathThapper, Anders

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