ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

An investigation on the structure properties of platinum nanoparticle deposition on graphene sheets by gamma-ray irradiation: a study of methanol electro-oxidation by synthesis catalyst

Sh. Kianfar, A. Nozad Golikand, and B. ZareNezhad

Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan, Iran

E-mail: nozadahmad77@gmail.com

Received: 10 July 2020  Accepted: 10 November 2020

Abstract:

Abstract

This is an investigation about the influence of synthesis conditions of graphene oxide (GO) such as KMnO₄ concentration and H₂SO₄/H₃PO₄ ratio on the structural and electrochemical properties of the Pt/rGO nanocatalyst produced based on gamma irradiation. The catalytic characterizations were evaluated by cyclic voltammetry (CV), impedance spectroscopy (EIS), chronoamperometry (CA), XRD, TEM, FTIR, and Raman. The Pt/rGO for 0.01 g/ml of KMNO₄ (Pt-G0.01 K) exhibited the highest stability and anodic peak of current with values of 0.1150 and 17.5 mA/cm² in terms of methanol oxidation and this value decreased with increasing it. Electrochemical activities enhanced with an increase in acid ratio of 0.07 mA/cm² for Pt-G50 to 6.46 mA/cm² for Pt-G100. TEM images showed that the ratio of H₂SO₄/H₃PO₄ was effective on the size and concentration of KMnO₄ on the amount of produced nanoparticles. The structural defects of Pt-G100 were less than those of the other similar catalysts. Finally, the study proved that manipulation of synthesis parameters of support can significantly change the structural and electrochemical properties of the Pt/rGO nanocatalyst in the radiation technique.

Graphic abstract

Keywords: Electrochemical study; Gamma-ray irradiation; Methanol oxidation; Radiation reduction; Pt/rGO nanocatalyst

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01430-9

Chemical Papers 75 (4) 1701–1714 (2021)