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Iron oxide/oxyhydroxide decorated graphene oxides for oxygen reduction reaction catalysis: a comparison study

机译：氧化铁/羟基氧化修饰的氧化石墨烯用于氧还原反应催化：对比研究

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摘要

The transition metal iron (Fe) has attracted particular interest in pursuit of low-cost oxygen reduction reaction (ORR) electrocatalysts. Carbon-supported iron oxides and oxyhydroxides have demonstrated promising ORR catalytic activities, but there is limited knowledge regarding the influence of iron species types and their crystalline phases on their ORR activities. In this paper we synthesized four iron/graphene composites with iron oxides (alpha-Fe2O3, Fe3O4) and oxyhydroxides (alpha-FeOOH, and alpha/gamma-FeOOH) supported on graphene oxide (GO), and systematically investigated their ORR behaviors. It is found that decorating GO with iron oxides and oxyhydroxides can dramatically improve the ORR activity of pristine GO in alkaline solution in terms of onset potential and current density, and the alpha-Fe2O3/GO exhibits the highest ORR activity among all four composite materials investigated. This study unveils diverse ORR behaviors on GO-supported iron species, and explores the benchmark of their catalytic performances, and thus provides useful insights into the Fe-enabled high ORR activity for developing efficient transition metal-based ORR electrocatalysts.
机译：过渡金属铁（Fe）在追求低成本氧还原反应（ORR）电催化剂方面引起了特别的兴趣。碳负载的氧化铁和羟基氧化铁已显示出有希望的ORR催化活性，但关于铁种类类型及其晶相对其ORR活性的影响的知识有限。在本文中，我们合成了四种以氧化铁（GO）为载体的氧化铁（α-Fe2O3，Fe3O4）和羟基氧化物（α-FeO​​OH和α/γ-FeOOH）铁/石墨烯复合材料，并系统地研究了它们的ORR行为。研究发现，用氧化铁和羟基氧化物装饰GO可以显着提高碱性GO中原始GO的ORR活性（从开始电势和电流密度方面来看），并且在所有四种研究的复合材料中，α-Fe2O3/ GO表现出最高的ORR活性。 。这项研究揭示了GO负载的铁物种上的多种ORR行为，并探索了其催化性能的基准，从而为开发有效的过渡金属基ORR电催化剂提供了铁基高ORR活性的有用见解。

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