In this study, functionalized graphene is used as a carbon‐based material to support platinum–ruthenium bimetallic nanoparticles and to improve methanol oxidation reaction activity due to the enhanced physical and electrical properties of graphene. First, surface oxidation is used for creating oxygen functional groups, and then nitrogen doping by thermal treatment with ammonia as the nitrogen precursor. Platinum–ruthenium alloy nanoparticles are dispersed by the impregnation reduction method on the support materials. The final nanocomposite samples contain 8% of oxygen and 3% of nitrogen. Compared to PtRu/GNS and PtRu/CB, the PtRu/NO‐GNS catalyst indicates 1.25 and 1.3 times higher surface area, and 2.3 and 4 times higher electrochemical surface area, respectively. The highest methanol oxidation current density of 305 mA/mg and 262 mA/mg is obtained for platinum–ruthenium supported on nitrogen‐doped graphene and nitrogen‐doped oxidized graphene, which is 2.9 and 2.5 times higher than that for PtRu/GNS, respectively. It is revealed that the nitrogen‐doped samples have shown greater activity and long‐term stability than other electrocatalysts, including the widely used carbon black supported catalyst. Hence, this work reports the performance of an efficient alternative electrocatalyst with practical application in direct methanol fuel cells.

中文翻译：

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通过低温热处理制备的氮掺杂石墨烯作为甲醇氧化的电催化剂载体

在这项研究中，功能化石墨烯被用作碳基材料，以支持铂-钌双金属纳米颗粒，并由于增强了石墨烯的物理和电性能而改善了甲醇氧化反应的活性。首先，将表面氧化用于产生氧官能团，然后通过以氨作为氮前体进行热处理来进行氮掺杂。铂-钌合金纳米颗粒通过浸渍还原法分散在载体材料上。最终的纳米复合材料样品包含8％的氧气和3％的氮气。与PtRu / GNS和PtRu / CB相比，PtRu / NO-GNS催化剂的表面积分别高1.25和1.3倍，电化学表面积分别高2.3和4倍。氮掺杂石墨烯和氮掺杂氧化石墨烯负载的铂-钌的最高甲醇氧化电流密度分别为305 mA / mg和262 mA / mg，分别是PtRu / GNS的2.9和2.5倍。 。结果表明，与其他电催化剂（包括广泛使用的炭黑负载型催化剂）相比，掺氮样品显示出更高的活性和长期稳定性。因此，这项工作报告了在直接甲醇燃料电池中具有实际应用的高效替代电催化剂的性能。结果表明，与其他电催化剂（包括广泛使用的炭黑负载型催化剂）相比，掺氮样品显示出更高的活性和长期稳定性。因此，这项工作报告了在直接甲醇燃料电池中具有实际应用的高效替代电催化剂的性能。结果表明，与其他电催化剂（包括广泛使用的炭黑负载型催化剂）相比，掺氮样品显示出更高的活性和长期稳定性。因此，这项工作报告了在直接甲醇燃料电池中具有实际应用的高效替代电催化剂的性能。