三维fe3o4修饰的氮掺杂石墨烯气凝胶作为氧还原反应的高耐用电催化剂

Jia Yu, Haiyan Jing, Zongdeng Wu, Boyuan Liu, Wu Lei, Q. Hao
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引用次数: 1

摘要

合理设计高效的氧还原反应电催化剂是燃料电池和金属-空气电池发展的关键。碳负载铁基材料因其性价比高、活性高而备受关注,是最有前途的ORR电催化剂。本文采用简单的水热法合成了三维(3D) Fe3O4修饰的n掺杂石墨烯气凝胶(Fe3O4/NGA)催化剂,并进行了退火处理。首先利用Fe2+与菲罗啉之间形成的配合物作为铁源和氮源的前驱体合成了Fe3O4纳米晶体。得益于均匀分布的Fe3O4纳米颗粒与三维多孔n掺杂石墨烯气凝胶之间的协同作用,Fe3O4/NGA表现出良好的电催化活性,半波电位为0.81 V。它还具有较低的HO2-产率(<5%)和优良的长期稳定性。结果表明,Fe3O4/NGA复合催化剂是制备ORR非贵重电催化剂的理想材料。
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3D Fe3O4-decorated Nitrogen-doped Graphene Aerogel as a Highly Durable Electrocatalyst for Oxygen Reduction Reactions
The rational design of efficient electrocatalysts for oxygen reduction reaction (ORR) is the key to developing fuel cells and metal-air batteries. Carbon-supported iron-based materials, as the most promising electrocatalysts for ORR, have drawn much attention as they are cost-effective and exhibit high activity. In this work, a three-dimensional (3D) Fe3O4-decorated N-doped graphene aerogel (Fe3O4/NGA) catalyst was synthesized following a simple hydrothermal method which was followed by an annealing process. The complex formed between Fe2+ and phenanthroline was first used as the precursor of iron and nitrogen sources to synthesize Fe3O4 nanocrystals. Benefiting from the synergistic effect between the uniformly distributed Fe3O4 nanoparticles and the 3D porous N-doped graphene aerogel, Fe3O4/NGA exhibits good electrocatalytic activity with a half-wave potential of 0.81 V. It also exhibits excellent selectivity with low HO2- yield (<5%), and excellent long-time stability. The encouraging results demonstrate that the Fe3O4/NGA composite catalyst is a promising candidate that can be used for the fabrication of non-precious electrocatalyst for ORR.
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