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首页> 外文期刊>Electroanalysis >One-pot Synthesized Co/Co3O4-N-Graphene Composite as Electrocatalyst for Oxygen Reduction Reaction and Oxygen Evolution Reaction
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One-pot Synthesized Co/Co3O4-N-Graphene Composite as Electrocatalyst for Oxygen Reduction Reaction and Oxygen Evolution Reaction

机译：一锅合成的Co / Co3O4-N-石墨烯复合物作为氧还原反应和析氧反应的电催化剂

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摘要

Efficient bifunctional catalysts for reversible oxygen electrodes, for electrocatalysis of both the oxygen reduction reaction (ORR) and the oxygen evolution reactions (OER) are envisioned to make a significant contribution towards the need for environmentally friendly and renewable energy systems. Despite tremendous efforts, there is still need for further development of bifunctional catalysts to achieve low-cost catalysts with stable satisfactory long-term performance, enhanced kinetics of the ORR and OER and high round-trip electrolytic-galvanic mode voltage efficiency. Herein, we demonstrate a simple one-pot procedure for synthesis of a bifunctional catalyst comprised of a composite of cobalt/cobalt oxide and N-doped graphene (denoted as Co/Co3O4-N-graphene), which exhibits very good performance in the electrocatalysis of both ORR and OER in alkaline solution. The prepared composite was characterized by TEM, SEM, Raman, XRD and XPS, to give insight of its structureperformance correlation. The results reveal that the structure of N-doped graphene is preserved and that both metallic Co and its oxide form of Co3O4 co-existed in the prepared composite, with metallic Co being predominant crystalline component. Generally, a high ratio of Co in the prepared composite led to improvement of the onset potential for the OER.
机译：预期可逆氧电极的高效双功能催化剂，用于氧还原反应（ORR）和氧释放反应（OER）的电催化，将为对环境友好和可再生能源系统的需求做出重大贡献。尽管付出了巨大的努力，但仍需要进一步开发双功能催化剂，以实现具有稳定的令人满意的长期性能，增强的ORR和OER动力学以及高往返电解电流模式电压效率的低成本催化剂。本文中，我们演示了一种简单的一锅法合成双功能催化剂的过程，该催化剂由钴/氧化钴和N掺杂的石墨烯（表示为Co / Co3O4-N-石墨烯）组成，在电催化中表现出非常好的性能碱性溶液中的ORR和OER的含量。通过TEM，SEM，Raman，XRD和XPS对制备的复合材料进行了表征，以了解其结构性能相关性。结果表明，保留了N掺杂的石墨烯的结构，并且金属Co和其氧化物形式的Co 3 O 4共存于制备的复合物中，其中金属Co是主要的结晶组分。通常，在制备的复合物中高比例的Co导致OER的起始电势提高。

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