Polyoxotungstate/Oxy-Graphene Nanocomposite Multilayer Films For Electrocatalytic Hydrogen Evolution

Abstract

In this study, nanocomposites were formed together with Keggin-type $K7-xNaxPW11O39∙14H2O$polyoxotungstates (POTs) clusters and oxygenated-graphene (Oxy-G). It was produced as a multilayer vialayer-by-layer self-assembly method using protonated poly (ethylenimine) (PEI). The produced$(PEI/POTs/Oxy-G)n$ multilayer films were controlled by XRD, cyclic voltammetry, and UV-Visiblespectrophotometry. $(PEI/POTs/Oxy-G)n$ multilayers are modified on a glassy carbon electrode. Thehydrogen evolution reaction takes place by taking advantage of the electrocatalytic activity of thisnanocomposite. They have been shown to exhibit a potentially good electrocatalytic activity at -0.4 V. Anotable electrocatalytic hydrogen evolution reaction could be identified on the $(PEI/POTs/Oxy-G)n$multilayer. We demonstrate that expanded the application of POTs/G nanocomposites to theelectrocatalysis of oxygen reduction reaction and hydrogen evolution reaction. This excellent approach willoffer new insights into different electrode structure and the development of novel electroactive catalysts.