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首页> 外文期刊>Journal of Materials Science >Facile preparation of nitrogen-doped reduced graphene oxide as a metal-free catalyst for oxygen reduction reaction
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Facile preparation of nitrogen-doped reduced graphene oxide as a metal-free catalyst for oxygen reduction reaction

机译：简便地制备氮掺杂的还原氧化石墨烯作为氧还原反应的无金属催化剂

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摘要

The electronic and chemical properties of reduced graphene oxide (RGO) can be modulated by chemical doping foreign atoms and functional moieties. Nitrogen-doped reduced graphene oxide (N-RGO) is a promising candidate for oxygen reduction reaction (ORR) in fuel cells. However, there are still some challenges in further preparation and modification of N-RGO. In this work, a low-cost industrial material, urea, was chosen to modify RGO by a facile, catalyst-free thermal annealing approach in large scale. The obtained N-RGO, as a metal-free catalyst for oxygen reduction was characterized by XRD, XPS, Raman, SEM, TEM, and electrochemical measurements. It was found that the optimum synthesis conditions were a mass ratio of graphene oxide and urea equal to 1:10 and an annealing temperature of 800 C. Detailed X-ray photoelectron spectrum analysis of the optimum product shows that the atomic percentage of N-RGO samples can be adjusted up to 2.6 %, and the resultant product can act as an efficient metal-free catalyst, exhibiting enhanced electrocatalytic properties for ORR in alkaline electrolytes. This simple, cost-effective, and scalable approach opens up the possibility for the synthesis of other nitrogen doping materials in gram-scale. It can be applied to various carbon materials for the development of other metal-free efficient ORR catalysts for fuel cell applications, and even new catalytic materials for applications beyond fuel cells.
机译：可以通过化学掺杂外来原子和功能部分来调节还原氧化石墨烯（RGO）的电子和化学性质。氮掺杂还原氧化石墨烯（N-RGO）是燃料电池中氧还原反应（ORR）的有希望的候选者。然而，在进一步制备和修饰N-RGO方面仍然存在一些挑战。在这项工作中，选择了一种低成本的工业材料尿素，通过一种简便，无催化剂的大规模热退火方法来改性RGO。通过XRD，XPS，拉曼，SEM，TEM和电化学测量来表征获得的N-RGO，其为无金属的用于氧还原的催化剂。发现最佳的合成条件是氧化石墨烯和尿素的质量比等于1:10，退火温度为800℃。对该最佳产物进行详细的X射线光电子能谱分析表明，N-RGO的原子百分比样品可调节至2.6％，所得产物可作为有效的无金属催化剂，对碱性电解液中的ORR表现出增强的电催化性能。这种简单，经济高效且可扩展的方法为克制其他氮掺杂材料的合成打开了可能性。它可以应用于各种碳材料，以开发用于燃料电池的其他无金属高效ORR催化剂，甚至可以用于燃料电池以外的新催化材料。

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