Abstract
Herein, water-oxidation reaction by cobalt(II) phthalocyanine, N,N′-bis (salicylidene) ethylenediamino cobalt(II), nickel(II) Schiff base (N,N′-bis (salicylidene)ethylenediamino nickel(II), nickel(II)) phthalocyanine-tetrasulfonate tetrasodium, manganese(II) phthalocyanine, 5,10,15,20-Tetraphenyl-21H,23H-porphine manganese(III) chloride, manganese(III) 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine chloride tetrakis(methochloride) was investigated using electrochemistry, UV-vis spectroscopy and spectroelectrochemistry. According to our results, a new decomposition pathway for these metal complexes under water-oxidation conditions was proposed. The produced metal oxide obtained by decomposition of metal complex under water -oxidation conditions not only catalyzes water-oxidation reaction but this metal oxide also accelerates decomposition of the corresponding complex to form higher amounts of the metal oxide. We hypothesize that such a mechanism could be investigated for many metal complexes under different oxidation or reduction reactions.
Highlights
Hydrogen is a promising molecule to store sustainable, intermittent and fluctuating energies[1]
Metal complexes were investigated in the presence of the corresponding metal oxides covered on fluorine-doped tin oxide electrode (FTO) in the absence of potential
The aim of this step was to track the adsorption of the metal complexes on the surface of the metal oxide covered on FTO in the absence of water-oxidation reaction
Summary
Hydrogen is a promising molecule to store sustainable, intermittent and fluctuating energies[1]. An approach to producing hydrogen is water-splitting reaction. In the presence of these metal complexes and under water-oxidation reaction, finding a true catalyst remains a challenging issue[11–15]. It is proposed that in some cases a metal complex is not stable and may decompose to metal oxides; subsequently, obtained metal oxides from decomposition of metal complex could serve as suitable catalysts for water-oxidation reaction. The details of the decomposition of metal complexes under water-oxidation reaction remain unknown. As metal oxides were reported to be a decomposition agent for organic compounds, it is needed to explore if formed metal oxides could affect the metal complexes under water-oxidation reactions. We reported a decomposition mechanism for Mn, Co and Ni-based complexes (Fig. S1) under water-oxidation reaction
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