Ni/Fe Clusters and Nanoparticles Confined by Covalent Organic Framework Derived Carbon as Highly Active Catalysts toward Oxygen Reduction Reaction and Oxygen Evolution Reaction,Advanced Sustainable Systems

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Ni/Fe Clusters and Nanoparticles Confined by Covalent Organic Framework Derived Carbon as Highly Active Catalysts toward Oxygen Reduction Reaction and Oxygen Evolution Reaction
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2020-06-08 , DOI: 10.1002/adsu.202000115
Qing Xu ₁ , Jing Qian ₁ , Dan Luo ₁ , Guojuan Liu ₁ , Yu Guo ₁ , Gaofeng Zeng ₁

Affiliation

Developing bifunctional electrocatalysts with high activity toward the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is of great significance for metal–air batteries. Herein, a covalent organic framework (COF)‐derived bifunctional electrocatalyst toward the ORR and the OER is demonstrated, in which the COF‐derived carbon on carbon nanotubes is used as the support to anchor active bimetal Ni/Fe clusters and nanoparticles. Since Ni/Fe ions are immobilized in the pore channels of the COFs, the aggregation and migration of ions under pyrolysis are effectively hindered. In addition, the COF‐derived carbon‐made catalyst features abundant nitrogen content and a high mesoporous volume. As a result, the catalyst displays ultrahigh ORR activity, with a half‐wave potential of 0.87 V versus reversible hydrogen electrode in 0.1 m KOH electrolyte. Moreover, the catalyst achieves a low operating potential of 1.55 V at a current density of 10 mA cm⁻², with a Tafel slop of 61 mV decade⁻¹ for OER in 0.1 m KOH, superior to most oxygen electrocatalysts. Furthermore, the catalyst also exhibits remarkable performance in Zn–air batteries. This work demonstrates a new insight into developing bifunctional catalysts from COFs.

中文翻译：

Ni / Fe团簇和共价有机骨架限制的纳米粒子衍生的碳作为高活性催化剂用于氧还原反应和氧释放反应

开发对氧还原反应（ORR）和氧释放反应（OER）具有高活性的双功能电催化剂对金属-空气电池具有重要意义。本文展示了共价有机骨架（COF）衍生的双功能电催化剂对ORR和OER的作用，其中碳纳米管上的COF衍生的碳用作支撑物来固定活性双金属Ni / Fe团簇和纳米颗粒。由于Ni / Fe离子固定在COF的孔道中，因此有效地阻止了热解过程中离子的聚集和迁移。此外，COF衍生的碳制催化剂具有丰富的氮含量和高的介孔体积。结果，该催化剂显示出超高的ORR活性，相对于0.1的可逆氢电极，其半波电势为0.87 Vm KOH电解质。此外，该催化剂在10 mA cm ^-2的电流密度下可实现1.55 V的低工作电势，在0.1 m KOH中的OER的Tafel斜率为61 mV十进位^-1，优于大多数氧气电催化剂。此外，该催化剂在Zn-空气电池中也表现出卓越的性能。这项工作展示了从COFs开发双功能催化剂的新见解。

更新日期：2020-06-08

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