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 via layer-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-Visible spectrophotometry. (PEI/POTs/Oxy-G)n multilayers are modified on a glassy carbon electrode. The hydrogen evolution reaction takes place by taking advantage of the electrocatalytic activity of this nanocomposite. They have been shown to exhibit a potentially good electrocatalytic activity at-0.4 V. A notable 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 the electrocatalysis of oxygen reduction reaction and hydrogen evolution reaction. This excellent approach will offer new insights into different electrode structure and the development of novel electroactive catalysts. © 2018, Turkish Chemical Society. All rights reserved.