A Nickel (II) PY5 Complex as an Electrocatalyst for Water Oxidation
2016 (English)In: Journal of Catalysis, Vol. 335, 72-78 p.Article in journal (Refereed) Published
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
Elsevier, 2016. Vol. 335, 72-78 p.
Nickel complex, Water oxidation catalyst, Electrochemistry, Water nucleophilic attack
IdentifiersURN: urn:nbn:se:kth:diva-173670DOI: 10.1016/j.jcat.2015.12.003ISI: 000371098200007ScopusID: 2-s2.0-84954413362OAI: oai:DiVA.org:kth-173670DiVA: diva2:854417
QC 201602082015-09-162015-09-162016-03-23Bibliographically approved