A chromium complex under water oxidation: A conversion mechanism and a comprehensive hypothesis. (19th January 2021)

• Record Type: Journal Article
• Authors: Akbari, Nader; Najafpour, Mohammad Mahdi
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 5(2021)
• Page Start: 3954
• Page End: 3963
• Publication Date: 2021-01-19
• Subjects: Catalyst -- Chromium complex -- Schiff base -- Water splitting -- Water oxidation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.10.229
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Water splitting toward hydrogen production is a promising method to store energy, but water oxidation is a bottleneck for water splitting. First-row transition metal complexes have been extensively used for water-oxidation reaction. However, only one chromium complex has been applied for water-oxidation reaction until now. Thus, the reinvestigation of water-oxidation reaction by this chromium complex in detail is interesting. Herein, water-oxidation reaction by the chromium complex with diphenoxy N, N′-ethylenebis(salicylimine) (SALEN) ligand is reinvestigated using scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction studies, X-ray photoelectron spectroscopy, thermal gravimetric analysis, elemental analysis, Fourier-transform infrared spectroscopy, and electrochemical methods. All the experiments showed that the chromium complex is neither a catalyst nor a precatalyst for water-oxidation reaction. During OER, a relationship between first-row transition metal complexes and the related metal oxides has been proposed. Graphical abstract: A conversion during water oxidation for a Cr complex with diphenoxy SALEN ligand is reported. Image 1 Highlights: Chromium complexes were rarely reported for water splitting. A chromium complex was synthesized and characterized. The complex was studied under water oxidation. The chromium complex under water-oxidation reaction was reinvestigated.