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  • Probing the Active Sites of Carbon-Encapsulated Cobalt Nanoparticles for Oxygen Reduction

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    Yan241651Accepted.pdf (551.9Kb)
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    Accepted Manuscript (AM)
    Author(s)
    Yan, Xuecheng
    Dong, Chung-Li
    Huang, Yu-Cheng
    Jia, Yi
    Zhang, Longzhou
    Shen, Shaohua
    Chen, Jun
    Yao, Xiangdong
    Griffith University Author(s)
    Yan, Xuecheng
    Jia, Yi
    Year published
    2019
    Metadata
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    Abstract
    Great effort has been contributed to exploring efficient and cost‐effective oxygen reduction reaction (ORR) catalysts for fuel cell applications in the past decades. Now various electrocatalysts can be synthesized for high‐performance ORR catalysis. However, the identification of the ORR active sites in many nonprecious metal‐based catalysts is still difficult. This is due to the heterogeneity and complexity of the catalyst structures. For example, the active site of core–shell ORR electrocatalysts has been a continuously debatable issue, hampering the exploration of new ORR catalysts. Herein, a carbonized Co metal organic ...
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    Great effort has been contributed to exploring efficient and cost‐effective oxygen reduction reaction (ORR) catalysts for fuel cell applications in the past decades. Now various electrocatalysts can be synthesized for high‐performance ORR catalysis. However, the identification of the ORR active sites in many nonprecious metal‐based catalysts is still difficult. This is due to the heterogeneity and complexity of the catalyst structures. For example, the active site of core–shell ORR electrocatalysts has been a continuously debatable issue, hampering the exploration of new ORR catalysts. Herein, a carbonized Co metal organic framework (Co@C) is used to uncover the ORR active sites in core–shell electrocatalysts. The surface Co particles in the Co@C sample are removed by HCl wash, and the Co cores are removed using an electrochemical activation method. The characterizations reveal that both the samples before and after the electrochemical activation show the existence of single Co species. The corresponding electrocatalysis test results indicate that neither the surface Co particles nor the encapsulated Co cores influence the ORR performance of the samples. It is deduced that the single Co species coordinated with the nitrogen in the carbon layers of the core–shell catalysts are the actual ORR active sites.
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    Journal Title
    Small Methods
    Volume
    3
    Issue
    9
    DOI
    https://doi.org/10.1002/smtd.201800439
    Copyright Statement
    © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Probing the Active Sites of Carbon-Encapsulated Cobalt Nanoparticles for Oxygen Reduction, Small Methods, Volume 3, Issue 9, Special Issue: Single Atoms for Energy Applications, 2019, which has been published in final form at 10.1002/smtd.201800439. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)
    Subject
    Nanotechnology
    Science & Technology
    Physical Sciences
    Technology
    Chemistry, Physical
    Nanoscience & Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/388129
    Collection
    • Journal articles

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