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Encapsulating Cobalt Nanoparticles in Interconnected N‐Doped Hollow Carbon Nanofibers with Enriched CoNC Moiety for Enhanced Oxygen Electrocatalysis in Zn‐Air Batteries

Advanced science, 2021-10, Vol.8 (20), p.e2101438-n/a [Peer Reviewed Journal]

2021 The Authors. Advanced Science published by Wiley‐VCH GmbH ;2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 2198-3844 ;EISSN: 2198-3844 ;DOI: 10.1002/advs.202101438 ;PMID: 34398519

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  • Title:
    Encapsulating Cobalt Nanoparticles in Interconnected N‐Doped Hollow Carbon Nanofibers with Enriched CoNC Moiety for Enhanced Oxygen Electrocatalysis in Zn‐Air Batteries
  • Author: Lu, Qi ; Wu, Han ; Zheng, Xuerong ; Chen, Yanan ; Rogach, Andrey L. ; Han, Xiaopeng ; Deng, Yida ; Hu, Wenbin
  • Subjects: Carbon fibers ; carbon nanofibers ; Catalysis ; Cooling ; CoNC moiety ; Decomposition ; Energy storage ; High temperature ; high‐temperature shock ; Interfaces ; Nanoparticles ; Nitrogen ; oxygen electrocatalysis ; zinc‐air batteries
  • Is Part Of: Advanced science, 2021-10, Vol.8 (20), p.e2101438-n/a
  • Description: Rational design of bifunctional efficient electrocatalysts for both oxygen reduction (ORR) and oxygen evolution reactions (OER) is desirable—while highly challenging—for development of rechargeable metal–air batteries. Herein, an efficient bifunctional electrocatalyst is designed and fabricated by encapsulating Co nanoparticles in interconnected N‐doped hollow porous carbon nanofibers (designated as Co@N‐C/PCNF) using an ultrafast high‐temperature shock technology. Benefiting from the synergistic effect and intrinsic activity of the CoNC moiety, as well as porous structure of carbon nanofibers, the Co@N‐C/PCNF composite shows high bifunctional electrocatalytic activities for both OER (289 mV at 10 mA cm−2) and ORR (half‐wave potential of 0.85 V). The CoNC moiety in the composite can modulate the local environmental and electrical structure of the catalysts, thus optimizing the adsorption/desorption kinetics and decreasing the reaction barriers for promoting the reversible oxygen electrocatalysis. Co@N‐C/PCNF‐based aqueous Zn–air batteries (AZAB) provide high power density of 292 mW cm−2, and the assembled flexible ZAB can power wearable devices. Benefiting from the CoNC moiety exposure in the well‐coupled interfaces and its highly porous structure, composites based on core–shell Co nanoparticles encapsulated by N‐doped carbon distributed within porous carbon nanofibers show efficient bifunctional electrocatalytic activities. Aqueous Zn–air batteries based on those composites provide high power density and long‐term cycling, and the flexible Zn–air batteries can power digital devices.
  • Publisher: Weinheim: John Wiley & Sons, Inc
  • Language: English
  • Identifier: ISSN: 2198-3844
    EISSN: 2198-3844
    DOI: 10.1002/advs.202101438
    PMID: 34398519
  • Source: Open Access: DOAJ Directory of Open Access Journals
    Open Access: PubMed Central
    Open Access: Wiley Blackwell Open Access Journals
    AUTh Library subscriptions: ProQuest Central
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