An investigation on the structure properties of platinum nanoparticle deposition on graphene sheets by gamma-ray irradia
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ORIGINAL PAPER
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. Kianfar1 · A. Nozad Golikand2 · B. ZareNezhad1 Received: 10 July 2020 / Accepted: 10 November 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
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 H 2SO4/H3PO4 was effective on the size and concentration of K MnO4 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.
* A. Nozad Golikand [email protected] * B. ZareNezhad [email protected] 1
Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, PO Box 35195‑363, Semnan, Iran
Nuclear Cycle Fuel Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
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Vol.:(0123456789)
Chemical Papers
Graphic abstract
Keywords Electrochemical study · Gamma-ray irradiation · Methanol oxidation · Radiation reduction · Pt/rGO nanocatalyst
Introduction Graphene is a 2D carbon material, which is created entirely of conjugated s p2 carbon in the structure of a honeycomb. Since its discovery in 2004 (Novoselov et al. 2004), graphene has generated significant attention because of its excellent electronic conductivity, good thermal and chemical stability, considerable structural flexibility, and superior specific surface area (Li et al. 2014). These unique properties have made graphene useful in a wide range of applications including supercapacitors (Bag et al. 2016; Chen et al. 2017; Golikand et al. 2017), wastewater treatment (Kirubaharan et al. 2016; Mishra et al. 2011), electronic devices (Ito et al. 2018; Kedzierski et al. 2008), sensors (Esfandiar et al. 2014; Justino et al. 2017; Shao et al. 2010), batteries (Cetinkaya et al. 2016; Chandrasekhar 2018; Ji et al. 2018), and biomedicine (ElSawy et al. 2019; Syama et al. 2019; Tuček et al. 2018). To date, several techniques have been applied for graphene synthesis such as mechanical exfol
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