Water oxidation catalyzed by two cobalt complexes: new challenges and questions†,Catalysis Science & Technology

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Water oxidation catalyzed by two cobalt complexes: new challenges and questions†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-02-22 00:00:00 , DOI: 10.1039/c7cy02602a
Mohammad Mahdi Najafpour _{1,

2,

3,

4,

5} , Hadi Feizi _{1,

2,

3,

4}

Affiliation

Herein, the water oxidation activities of two cobalt complexes (cobalt(II) phthalocyanine and N,N′-bis(salicylidene)ethylenediamino cobalt(II)) were studied. The experiments showed that at pH 11, N,N′-bis(salicylidene)ethylenediamino cobalt(II) and cobalt(II) perchlorate were active for water oxidation. On the other hand, for cobalt(II) phthalocyanine as a stable complex, no water oxidation was observed. The role of nanosized particles containing Co, P, and O in the electrochemical oxidation of water by cobalt complexes was investigated by some methods. After the water oxidation reaction, both complexes and the cobalt salt were studied and a relationship between the decomposition of the cobalt complex and water oxidation was proposed. A critical point is that on the surface of the electrode, there are some areas without any detectable nanoparticles, and thus, the detection of such cobalt compounds on the surface of the electrode is not easy even by high-resolution visible spectroelectrochemistry and scanning electron microscopy. Such experiments showed that to propose a molecular mechanism for water oxidation in the presence of metal complexes, careful analysis is necessary to rule out the role of nanoparticles.

中文翻译：

两个钴配合物催化的水氧化：新挑战和新问题†

在此，研究了两种钴配合物（钴（II）酞菁和N，N′-双（水杨基）亚乙基二氨基钴（II））的水氧化活性。实验表明，在pH值为11的条件下，N，N'-双（水杨基）亚乙基二氨基钴（II）和高氯酸钴（II）对水氧化具有活性。另一方面，对于钴（II）酞菁为稳定的络合物，未观察到水氧化。通过一些方法研究了含有Co，P和O的纳米级颗粒在钴配合物对水进行电化学氧化中的作用。在水氧化反应之后，研究了配合物和钴盐，并提出了钴配合物的分解与水氧化之间的关系。一个关键点是，在电极表面上，有些区域没有任何可检测到的纳米粒子，因此，即使通过高分辨率可见光谱电化学和扫描电子显微镜，也不容易在电极表面上检测此类钴化合物。。这样的实验表明，提出一种在金属络合物存在下水氧化的分子机理，

更新日期：2018-02-22

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