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  • Creation of Ge−Nx−Cy Configures in Carbon Nanotubes: Origin of Enhanced Electrocatalytic Performance for Oxygen Reduction Reaction

    Author(s)
    She, Xilin
    Li, Qianqian
    Ma, Na
    Sun, Jin
    Jing, Dengwei
    Chen, Chengmeng
    Yang, Lijun
    Yang, Dongjiang
    Griffith University Author(s)
    Yang, Dongjiang
    Year published
    2016
    Metadata
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    Abstract
    High-performance nitrogen and germanium codoped carbon nanotubes (N–Ge–CNTs) were synthesized as oxygen reduction reaction (ORR) catalysts by one-step sintering of carboxyethyl germanium sesquioxide and multiwalled CNTs in NH3 atmosphere. The ORR electrocatalytic activity evaluation was performed by using limited current density, selective reaction pathway, onset potential, H2O2 yields, and kinetic current density. In comparison with Ge or N solely doped CNTs, the codoped samples display more excellent ORR catalytic performance. It was observed that the codoped GeN3C, GeN4, and GeN4 + NC3 microstructures in N–Ge–CNTs are ...
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    High-performance nitrogen and germanium codoped carbon nanotubes (N–Ge–CNTs) were synthesized as oxygen reduction reaction (ORR) catalysts by one-step sintering of carboxyethyl germanium sesquioxide and multiwalled CNTs in NH3 atmosphere. The ORR electrocatalytic activity evaluation was performed by using limited current density, selective reaction pathway, onset potential, H2O2 yields, and kinetic current density. In comparison with Ge or N solely doped CNTs, the codoped samples display more excellent ORR catalytic performance. It was observed that the codoped GeN3C, GeN4, and GeN4 + NC3 microstructures in N–Ge–CNTs are crucial to improving ORR catalytic performance, such as ideal 4 electron pathway (3.95) and positive onset potential (−0.08 V). The high ORR performance is attributed to the synergistic effect of N and Ge doping, which is capable of activating the π electrons of sp2 hybridized orbital around carbon nantotubes. The ORR catalytic synergistic effect has also been verified by calculating the work function on the basis of density functional theory (DFT).
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    Journal Title
    ACS Applied Materials & Interfaces
    Volume
    8
    Issue
    16
    DOI
    https://doi.org/10.1021/acsami.6b03260
    Subject
    Chemical sciences
    Macromolecular and materials chemistry not elsewhere classified
    Engineering
    Publication URI
    http://hdl.handle.net/10072/99747
    Collection
    • Journal articles

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