A nickel (II) PY5 complex as an electrocatalyst for water oxidation
2016 (English)In: Journal of Catalysis, ISSN 0021-9517, E-ISSN 1090-2694, Vol. 335, 72-78 p.Article in journal (Refereed) PublishedText
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.
Nickel complex, Water oxidation catalyst, Electrochemistry, Water nucleophilic attack
IdentifiersURN: urn:nbn:se:uu:diva-282298DOI: 10.1016/j.jcat.2015.12.003ISI: 000371098200007OAI: oai:DiVA.org:uu-282298DiVA: diva2:916878
FunderSwedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Energy Agency