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  • Identification of active sites for acidic oxygen reduction on carbon catalysts with and without nitrogen doping

    Author(s)
    Jia, Yi
    Zhang, Longzhou
    Zhuang, Linzhou
    Liu, Hongli
    Yan, Xuecheng
    Wang, Xin
    Liu, Jiandang
    Wang, Jiancheng
    Zheng, Yarong
    Xiao, Zhaohui
    Taran, Elena
    Chen, Jun
    Yang, Dongjiang
    Zhu, Zhonghua
    Wang, Shuangyin
    Dai, Liming
    Yao, Xiangdong
    Griffith University Author(s)
    Yan, Xuecheng
    Jia, Yi
    Year published
    2019
    Metadata
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    Abstract
    Owing to the difficulty in controlling the dopant or defect types and their homogeneity in carbon materials, it is still a controversial issue to identify the active sites of carbon-based metal-free catalysts. Here we report a proof-of-concept study on the active-site evaluation for a highly oriented pyrolytic graphite catalyst with specific pentagon carbon defective patterns (D-HOPG). It is demonstrated that specific carbon defect types (an edged pentagon in this work) could be selectively created via controllable nitrogen doping. Work-function analyses coupled with macro and micro-electrochemical performance measurements ...
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    Owing to the difficulty in controlling the dopant or defect types and their homogeneity in carbon materials, it is still a controversial issue to identify the active sites of carbon-based metal-free catalysts. Here we report a proof-of-concept study on the active-site evaluation for a highly oriented pyrolytic graphite catalyst with specific pentagon carbon defective patterns (D-HOPG). It is demonstrated that specific carbon defect types (an edged pentagon in this work) could be selectively created via controllable nitrogen doping. Work-function analyses coupled with macro and micro-electrochemical performance measurements suggest that the pentagon defects in D-HOPG served as major active sites for the acidic oxygen reduction reaction, even much superior to the pyridinic nitrogen sites in nitrogen-doped highly oriented pyrolytic graphite. This work enables us to elucidate the relative importance of the specific carbon defects versus nitrogen-dopant species and their respective contributions to the observed overall acidic oxygen reduction reaction activity.
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    Journal Title
    Nature Catalysis
    Volume
    2
    Issue
    8
    DOI
    https://doi.org/10.1038/s41929-019-0297-4
    Subject
    Chemical sciences
    Science & Technology
    Physical Sciences
    Chemistry, Physical
    Chemistry
    HIGH ELECTROCATALYTIC ACTIVITY
    Publication URI
    http://hdl.handle.net/10072/394407
    Collection
    • Journal articles

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