Preparation and characterization of metal molybdates and tungstates for electrocatalysis of oxygen evolution

Abstract

The present thesis work is comprised of design and development of low cost and stable electrode materials for water oxidation in alkaline solutions. For the purpose, some novel transition metals mixed oxides, namely metal molybdates and tungstateswere chosen for the study under the title investigation. Metal molybdates and tungstates are the two important families of inorganic belonging to the wolframite structure. The oxide materials synthesized and investigated are: FexMn1-xMoO4 (x = 0, 0.25, 0.5 and 0.75), CuxFe2-x(MoO4)3 (x = 0, 0.25, 0.5, 0.75, 1.0 and1.5), MMoO4 (M = Cr, Mn, Fe, Co, Ni, Cuand Zn), and MWO4 (M = Co and Ni). Fe-substituted manganese molybdates, Cu-substituted iron molybdates, and metal tungstates were prepared by a co-precipitation method whereas binary oxides of a transition metal with molybdenum were obtained by a microwave-assisted co-precipitation method newline