Journal
ACS CATALYSIS
Volume 6, Issue 8, Pages 5062-5068Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b00798
Keywords
heterogeneous versus homogeneous water oxidation catalysis; dinuclear cobalt complex; electrocatalysis; photocatalysis; identification; cobalt oxide
Categories
Funding
- 973 program of China [2012CB821706, 2014CB845602]
- NSFC [21331007]
- NSF of Guangdong Province [S2012030006240]
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Recently, a dinuclear cobalt complex, RTPA)Co-III(mu-OH)(mu-O-2)Co-III(TPA)](ClO4)(3) (1; TPA = tris(2-pyridylmethyl)amine), has been reported as a homogeneous catalyst for electrochemical and photochemical water oxidation (Angew. Chem. Int. Ed. 2014, 53, 14499). During the reinvestigation of the reported water oxidation catalyst (WOC) of 1, several characterizations such as EDTA and bipyridine titrations, electrochemistry, SEM, EDX, ICP-AES, TEM, XPS, and UV-vis spectroscopy have revealed that the water oxidation may happen due to the formation of CoOx as a real heterogeneous WOC, and 1 itself lacks the ability to catalyze water oxidation. This paper presents a practical and simple procedure to clarify whether the water oxidation is truly catalyzed by a molecular catalyst or not.
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