Reinvestigation of Water Oxidation Catalyzed by a Dinuclear Cobalt Polypyridine Complex: Identification of CoOx as a Real Heterogeneous Catalyst
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- 作者：Jia-Wei Wang ; Pathik Sahoo ; Tong-Bu Lu
- 刊名：ACS Catalysis
- 出版年：2016
- 出版时间：August 5, 2016
- 年：2016
- 卷：6
- 期：8
- 页码：5062-5068
- 全文大小：443K
- 年卷期：0
- ISSN：2155-5435
文摘
Recently, a dinuclear cobalt complex, [(TPA)CoIII(μ-OH)(μ-O2)CoIII(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.