Decorating ZIF-67-derived cobalt–nitrogen doped carbon nanocapsules on 3D carbon frameworks for efficient oxygen reduction and oxygen evolution. (15th June 2021)

• Record Type: Journal Article
• Authors: Zhang, Yating; Wang, Peng; Yang, Juan; Lu, Shasha; Li, Keke; Liu, Guoyang; Duan, Yingfeng; Qiu, Jieshan
• Is Part Of: Carbon. Volume 177(2021)
• Page Start: 344
• Page End: 356
• Publication Date: 2021-06-15
• Subjects: 3D hierarchical hybrid -- Nitrogen-doped graphene -- Hollow carbon nanocapsule -- Bifunctional oxygen electrocatalysts; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.02.052
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: The rational construct of bifunctional electrocatalysts with high active and excellent cycling durability is the top priority for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Recently, metal-nitrogen-doped carbon (M-N-C) components formed by transition metal (TM) combined with nitrogen-doped carbon materials have drawn extensive interests due to their inexpensive cost and great activity. Herein, a straightforward evaporation-pyrolysis strategy is designed for the preparation of 3D hierarchical electrocatalyst (abbreviated as Co@N–HCCs@NG, which represented carbonization products at 900 °C) made of nitrogen-doped hollow carbon nanocapsules combined with Co nanoparticles bridged N-doped graphene by carbonization of a pristine ZIF-67/GO, enables hierarchical porous structure, high surface area (618.12 m 2 g-1) and a hollow capsule-like nanostructure. Of these, the Co@N–HCCs@NG composite displays outstanding electrocatalytic performances for OER (overpotential of 298 mV @ 10 mA cm -2 ) and ORR (0.86 V @ E1/2 ) in alkaline electrolyte, which could rival the most of reported materials. The tactics presented in this research may provide a powerful platform to engineer non-precious highly electroactive catalysts with a well-excogitated structure and preferable activity for clean energy conversion technologies. Graphical abstract: Image 1 Highlights: A facile evaporation-pyrolysis tactic is proposed. Highly porous and hollow non-noble metal carbon nanostructure has been constructed. The cobalt-carbon nanocapsules present in NG boost the electrocatalytic activity. The Co@N–HCCs@NG shows superior electrocatalytic activity for ORR and OER.