Photochemical Carbondioxide Reduction to Formic Acid using Small CuW₆O₂₅ Cluster and A Competitive Self-assemble Soft-Oxometalate (SOMs)

Kumar, Saurabh (2015) Photochemical Carbondioxide Reduction to Formic Acid using Small CuW₆O₂₅ Cluster and A Competitive Self-assemble Soft-Oxometalate (SOMs). Masters thesis, Indian Institute of Science Education and Research Kolkata.

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Abstract

To find a Renewable resource of energy is an intimate challenge now these days. Much work had been done from last twenty years based on water oxidation and reduction, fuel cell, hydrogen reduction and carbon dioxide reduction by different research group to develop the alternative energy resource. Carbon dioxide is a one of the harmful greenhouse gas which leads to depletion in ozone layer at a higher concentration in environment. Thus to make an alternative energy resources using carbon dioxide, is one of the versatile route which save the environment. In our present work we have synthesized a small Copper tungsten based Polyoxometalate Na₂[CuW₆O₂₀(H₂O)₅] cluster , and used it as a catalyst to performed Photochemical Carbon dioxide Reduction to Formic acid, carbon dioxide reduction takes place after water oxidation in the system. A competitive Self-assemble of Soft-Oxometalate (SOMs) is not known so far, We synthesized a SOMs which constituent POM undergo Self-assemble with time and at the end of this process it again come back to initial materials. Polyoxometalate (POM) is a large metal Oxo-frame work and show versatile character, largely used in catalyst, Modelling etc. like PMO₁₂O₄₀ ∁ MO₇₂Fe₃₀ is giant ball shape cluster in which PMO12O40 encapsulated on it. Polyoxometalate has a hard boundary and it is impossible to change in morphology crystal with time, without any external perturbation, competitive self-assemble between two constituent in a single crystal not possible, therefore we used it in the form of SOMs, Which is basically a dispersion of POM in water, which has a soft boundary and easy to do change its soft boundary by self-assemble method.

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