Electrochemical Properties of Polyoxometalate− Graphene Oxide Hybrid Catalyst

Polyoxometalates (POMs) are a large group of metal oxide clusters that possess rich structural diversity and unique chemical/physical properties, and may be widely applied in catalysis, medicine, magnets, (photo) electronic materials, and functional nanoscale systems [1]. Polyoxometalates (POMs) are composed of d-block transitional metal-oxide nanosized, anionic cluster structures and are prospective candidates for electrocatalysis due to their multiple redox properties [2, 3]. Graphene, consisting of a monolayer of sp2 carbon atoms, is an attractive material in many research fields including electrocatalytic applications owing to its unique properties such as high surface area, outstanding electrical properties, and high mechanical and thermal properties [4, 5]. Graphene is a unique candidate for a POM support material to overcome problems of both low surface area and high solubility of POMs. Here we reported a new Polyoxometalate− Graphene Oxide hybrid materials and studied the Electrochemical properties of this hybrid cluster using experimental method. The electrochemical behavior of POMs in acidic media involves one or two electron reversible reductions to produce reduced POMs, or so-called heteropoly blues owing to their changed color, and further irreversible multielectron reduction with decomposition in the homogeneous state. These Polyoxometalate− Graphene Oxide hybrid materials were characterized by 1H-NMR, FT- IR, UV-Vis spectroscopic methods and cyclic voltammetry.