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.

Graphic abstract

中文翻译：

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负载在还原氧化石墨烯（rGO）上的Pt-M（M：W，Mo和V）双金属氧化物纳米颗粒：放射合成和甲醇氧化电催化

摘要

负载在rGO上的Pt和Pt-M纳米催化剂（M：V，MO和W）通过基于辐照的简单方法成功合成，并被用作在酸性介质中甲醇氧化方面的电催化剂。通过ICP，TEM，XRD和EDX分析催化剂的形态，纯度和组成。辐照导致金属纳米颗粒（直径为1至8 nm）沉积在石墨烯板上，而无需使用任何稳定剂和表面活性剂。与整体式铂催化剂相比，双金属纳米催化剂在环境温度下表现出更高的甲醇氧化电化学活性。当使用钨作为第二种金属时，观察到有效活性表面积（ECSA）显着增加。对于其他催化剂，该值的顺序为Pt-Mo> Pt-V> Pt。最后，

图形摘要