期刊
JOURNAL OF CATALYSIS
卷 335, 期 -, 页码 72-78出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2015.12.003
关键词
Nickel complex; Water oxidation catalyst; Electrochemistry; Water nucleophilic attack
资金
- Swedish Research Council
- K AMP
- A Wallenberg Foundation
- Swedish Energy Agency
- China Scholarship Council (CSC)
- National Natural Science Foundation of China [21120102036]
- National Basic Research Program of China [2014CB239402]
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. (C) 2015 Elsevier Inc. All rights reserved.
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