Hybrid Materials

Polyoxometalate based hybrid materials (bulk and nano) for applications in Energy and Catalysis

Hybrid materials synthesized at the interface of two contrasting fields have the advantage of assembling the rich properties of both in enhancing their potential in applications and if carefully designed also is devoid of the negative ones of both. Polyoxometalate based hybrids are one such class where the potential of these electron rich BrØnsted acids can be explored fully by forming hybrids with other units (like organic ligands, ionic liquids, clays, inorganic cations, nano-heterostructure, carbon support etc.) to make them more viable for practical applications. Polyoxometalates (POMs) are a class of metal-oxy anion clusters (of nano-dimensions) usually consisting of transition metals (Cr, V, Ti, Mn, Co, Ni, Fe, Cu, Mo, W, Nb) in their highest oxidation states. They possess numerous physicochemical properties which render them great potential for applications in versatile fields like catalysis, biology and energy. These properties can be enlisted as the following: (a) redox facile nature, (b) photoactive properties, (c) hydrolyzable protons giving rise to acidity, and (d) anionic and oxygen-rich nature. POMs cater to all kinds of catalysis eg. organic, electro and photo catalysis. In our lab we are interested in synthesizing different hybrid and nano systems involving polyoxometalates which can act active materials in the frontiers of energy conversion and generation. The materials are characterized through Single crystal XRD, Powder XRD, Microscopy (TEM & SEM), Spectroscopy (IR, UV, PL, Raman, Mass) and thorough extensive elemental analysis. We employ these materials both electrochemically (Hydrogen evolution reaction, Oxygen evolution reaction, water splitting) and photocatalytically (Hydrogen evolution and water splitting) as catalysts to facilitate energy conversions from renewable sources, which is currently one of the most important and highly estimated research topic around the globe. These hybrid materials are also applied for catalysis of small organic molecules to synthesize important products which act as starting materials in many industries and pharmaceutical companies. Photovoltaics is another area of application where polyoxometalate based materials have shown promises in recent past. Situated in an institute with extremely advanced world class research facilities, we at SSICL are bent upon exploring and designing many such kinds of novel systems (both bulk and nano) for targeted applications in energy and catalysis.

 

Publications:

1. Crystal Structure and Band Gap Engineering in Polyoxometalate Based Inorganic-Organic Hybrids

S. Roy, S. Sarkar, J. Pan, U. V. Waghmare, R. Dhanya, C. Narayana and S. C. PeterInorg. Chem (2016)

2. Two Dimensional Bicapped Supramolecular Hybrid Semiconductor Material Constructed from the Insulators a-KegginPolyoxomolybdate and 4,4′-Bipyridine

A. K. Iyer, S. C. Peter, Inorg. Chem 53, 653-660, (2014)

3. Ligand mediated valence fluctuation of copper in new hybrid materials constructed from decavanadate and Cu(1,10-phenanthroline) complex

A. K. Iyer, S. Roy, R. Haridasan, S. Sarkar, S. C. PeterDalton Trans. 43, 2153-2160, (2014)

 

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