Chemical Synthesis of Nanostructured SrWO4 for Electrochemical Energy Storage and Conversion Applications

Abstract

Nanostructured strontium tungstate was successfully synthesized by a co-precipitation method at 80°C. The structure and morphology of the obtained SrWO4 were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The XRD pattern conformed that the prepared sample has a scheelite-type tetragonal structure. The electrochemical properties of the SrWO4 were investigated in 0.5 M NaOH electrolyte solution by cyclic voltammetry (CV), galvanostatic charge–discharge cycling and electrochemical impedance spectroscopy (EIS) measurements. Also, platinum have been supported onto the surface of SrWO4 /graphite electrode to use as catalyst support. The morphology of the catalysts was characterized by scanning electron microscopy analysis and EDX. The electrocatalytic activity of platinum loaded SrWO4 /graphite electrode toward oxygen reduction reaction (ORR) has been studied in 0.5 M H 2 SO 4 solution and compared with that of platinum supported on graphite using electrochemical measurements. The PtSrWO4 /graphite catalyst showed higher ORR activity than Pt /graphite catalyst.