Bimetallic-metal oxide nanoparticles of Pt-M (M: W, Mo, and V) supported on reduced graphene oxide (rGO): radiolytic syn
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ORIGINAL RESEARCH
Bimetallic‑metal oxide nanoparticles of Pt‑M (M: W, Mo, and V) supported on reduced graphene oxide (rGO): radiolytic synthesis and methanol oxidation electrocatalysis Shohreh Kianfar1 · Ahamd Nozad Golikand2 · Bahman ZareNezhad1 Received: 14 July 2020 / Accepted: 29 October 2020 © Islamic Azad University 2020
Abstract Nanocatalysts of Pt and Pt-M (M: V, MO and W) supported on rGO were successfully synthesized via a simple process based on irradiation and investigated as electrocatalysts in terms of methanol oxidation in acidic medium. Morphology, purity and composition of the catalysts were analyzed by ICP, TEM, XRD, and EDX. Irradiation caused the metallic nanoparticles (from 1 to 8 nm in diameter) to be deposited on the graphene sheets without using any stabilizer and surfactant. Bimetallic nanocatalysts exhibited higher electrochemical activities of methanol oxidation comparing to monolithic Pt catalyst at ambient temperature. A considerable increase in the effective active surface area (ECSA) was observed when the tungsten was used as the second metal; this value was in the order of Pt-Mo > Pt-V > Pt for other catalysts. Finally, high catalytic activity, great durability, and stability of Pt-W offer it to be a promising electrocatalyst for development of more advanced direct alcohol fuel cells.
* Bahman ZareNezhad [email protected] 1
Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, P.O. Box: 35195‑363, Semnan, Iran
Nuclear Cycle Fuel Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
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Vol.:(0123456789)
Journal of Nanostructure in Chemistry
Graphic abstract
Keywords Bimetallic nanocatalyst · Irradiation synthesis · Methanol oxidation · Electrochemical activity
Introduction Transition metal nanoparticles are utilized for catalytic activities in the development of fuel cells. Among these metals, platinum is intrinsically an excellent catalyst for methanol oxidation reaction (MOR) and is usually incorporated into carbon supports such as carbon black [1, 2], graphite nanofibres [3] and carbon nanotubes [4, 5]. Recently, the use of graphene as a carbon support has created a great interest at fuel cell applications. It has unique physicochemical properties like superior specific surface area (2600 m2/g), excellent electronic conductivity, high surface to volume ratio, and good thermal and chemical stability [6–8]. Among different species of fuel cells, direct methanol fuel cells (DMFCs) have attracted much attention for mobile phones, electronic devices, and drive automobiles due to relatively less environmental pollution, low
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operating temperature, high volumetric energy density, and feeding convenience of liquid fuels [9–12]. Nevertheless, one of the major barriers for commercialization of DMFC is the high price of Pt and its tendency to be poisoned by carbon monoxide (CO)-like intermediates, which are formed in the course of methanol dissociation process [13, 14]. From chemical point of view, the main metho
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