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Nitrogen-doped graphene/carbon nanotube/Co3O4 hybrids: one-step synthesis and superior electrocatalytic activity for the oxygen reduction reaction

机译：氮掺杂石墨烯/碳纳米管/ Co3O4杂化物：一步合成和对氧还原反应的优异电催化活性

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摘要

Oxygen reduction reaction (ORR) catalysts play an important role in fuel cells, and the ever-increasing energy demand calls for efficient and cost-effective ORR catalysts. However, commercial ORR catalysts are mainly noble metal based materials like Pt/C, which suffer from drawbacks of high cost and poor stability. In this study, we prepared a non-noble metal ORR catalyst with high efficiency through a simple one-step hydrothermal method, in which the reduction of graphene oxide (GO) along with the doping of nitrogen and Co3O4 nanoparticles were realized at the same time, thus resulting in a unique hierarchical structure of nitrogen-doped reduced graphene oxide/carbon nanotube/Co3O4 (N-rGO/CNT/Co3O4) hybrids. Due to the synergistic effects between the active components and the effective nitrogen doping, as well as the space effect of CNTs and Co3O4 nanoparticles on avoiding the restacking of graphene nanosheets, the N-rGO/CNT/Co3O4 hybrids exhibited enhanced ORR catalytic performance with long-term stability and excellent resistance towards methanol crossover effects, indicating their promising potential as ORR electrocatalysts in practical applications.
机译：氧还原反应（ORR）催化剂在燃料电池中起着重要的作用，不断增长的能源需求要求高效和具有成本效益的ORR催化剂。然而，商业ORR催化剂主要是基于贵金属的材料如Pt / C，其具有成本高和稳定性差的缺点。在这项研究中，我们通过简单的一步水热法高效制备了一种非贵金属ORR催化剂，其中氧化石墨烯（GO）的还原以及氮和Co3O4纳米颗粒的掺杂同时实现，因此产生了氮掺杂的还原氧化石墨烯/碳纳米管/ Co3O4（N-rGO / CNT / Co3O4）杂化物的独特层次结构。由于活性组分与有效氮掺杂之间的协同作用，以及CNT和Co3O4纳米颗粒在避免石墨烯纳米片重新堆积方面的空间效应，N-rGO / CNT / Co3O4杂化体显示出增强的ORR催化性能，且长效期长期稳定性和优异的抗甲醇穿越作用能力，表明它们在实际应用中作为ORR电催化剂的潜力很大。

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