A proposed mechanism to form nanosized Mn oxides from the decomposition of β-cyclodextrin-Mn complex: Toward nanosized water-splitting catalysts with special morphology. (20th April 2017)

• Record Type: Journal Article
• Authors: Najafpour, Mohammad Mahdi; Kaboudin, Babak; Mostafalu, Ramin; Shahbazy, Mohammad; Safdari, Rasoul; Kompany-Zareh, Mohsen
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 16(2017)
• Page Start: 11187
• Page End: 11198
• Publication Date: 2017-04-20
• Subjects: Mn oxides -- β-cyclodextrin-Mn complex -- Nanosized metal oxides -- Thermo-decomposition -- Electrochemical voltammetry -- Chemometrics; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.03.005
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Metal oxides are promising compounds for water-splitting systems toward hydrogen production. One of the most important methods to prepare nanosized metal oxides is the decomposition of metal complexes. Herein, different Mn oxides from the decomposition of β-cyclodextrin-Mn complex in different calcined temperatures were studied by scanning electron microscopy, thermal gravimetric analysis, X-ray diffraction and a few electrochemical methods. Using scanning electron microscopy, we propose a mechanism to answer to the question that how is Mn oxide formed by the decomposition of β-cyclodextrin-Mn complex. In the next step, usual chemometric methods, principal component analysis (PCA) and multivariate curve resolution-alternating least squares (MCR-ALS), were used to not only determine the number of components and data visualization, but also examine the square wave voltammograms of obtained Mn oxides from the decomposition of β-cyclodextrin-Mn complex. Water-oxidizing activities of the compounds under the presence of photo-produced Ru(bpy)3 3+ were also considered. Graphical abstract: Highlights: The decomposition of metal complexes is a promising method to synthesize metal oxides. The decomposition of β-cyclodextrin-Mn complex in different temperatures forms Mn oxides. A mechanism to decompose β-cyclodextrin-Mn complex is proposed. Chemometrics was used to monitor the electrochemical reactions during the complex thermal decomposition.