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    Home > Chemicals Industry > Chemical Technology > Shanghai Institute of Ceramics and others discovered new supercapacitor materials

    Shanghai Institute of Ceramics and others discovered new supercapacitor materials

    • Last Update: 2022-11-19
    • Source: Internet
    • Author: User
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    Recently, the Shanghai Institute of Ceramics, Chinese Academy of Sciences and Peking University cooperated in research, Cui Houlei, Huang Fuqiang and other researchers discovered a new supercapacitor niobium nitride electrode material with excellent performance - Nb4N5 nanoporous film
    .

    Preparation process and electrochemical performance of Nb4N5 nanoporous film

    Nb4N5 belongs to the I4/m space group of the tetragonal crystal system, which is a NaCl-type structure rich in Nb vacancy defects, and has never been used as an energy storage material
    .
    The preparation process is simple, only the Nb foil is anodized under appropriate conditions, followed by heat treatment in NH3 atmosphere, and a highly ordered Nb4N5 nanopore array
    can be prepared.

    The results of XPS analysis showed that Nb4N5 contained both Nb3+ and Nb5+, and the presence of mixed valence cations not only produced Faraday pseudocapacitance, but also led to good metalloid conductivity
    .
    In 1 M H2SO4 electrolyte, a surface capacitance of 226 mF cm-2 was obtained at a current density of 0.
    5 mA cm-2, which was much higher than that of 0.
    2 mF cm-2 similar to Nb2O5 electrode, and also reached the highest level
    of metal nitride nanostructured thin film electrode.
    The current density increases to 10 mA cm-2 and remains at 137 mF cm-2, illustrating good rate performance
    .
    In addition, through the polymerization and carbonization of dopamine, the Nb4N5 nanoporous thin film electrode is coated with an ultra-thin carbon film, which significantly improves the cycle stability, and the capacitance retention rate increases to nearly 100%
    after 2000 cycles of voltammetry.
    Studies have shown that carbon-coated Nb4N5 nanoporous films can form two-electrode symmetric devices, which have good practical application potential
    .

    This new supercapacitor material Nb4N5 nanoporous film can also be used as a good support to deposit other active materials to form a composite electrode; It is also expected to be used in other energy-related applications
    .
    The preparation method of the material is simple and reliable, with excellent morphology and structure, superior electrochemical performance, and can be generalized to Ti, W, Zr, Nb and Ta systems, which provides a good idea
    for the development and design of new nitride and oxide nitride superelectric electrode materials.

    Recently, the Shanghai Institute of Ceramics, Chinese Academy of Sciences and Peking University cooperated in research, Cui Houlei, Huang Fuqiang and other researchers discovered a new supercapacitor niobium nitride electrode material with excellent performance - Nb4N5 nanoporous film
    .

    Supercapacitors

    Preparation process and electrochemical performance of Nb4N5 nanoporous film

    Preparation process and electrochemical performance of Nb4N5 nanoporous film

    Nb4N5 belongs to the I4/m space group of the tetragonal crystal system, which is a NaCl-type structure rich in Nb vacancy defects, and has never been used as an energy storage material
    .
    The preparation process is simple, only the Nb foil is anodized under appropriate conditions, followed by heat treatment in NH3 atmosphere, and a highly ordered Nb4N5 nanopore array
    can be prepared.

    The results of XPS analysis showed that Nb4N5 contained both Nb3+ and Nb5+, and the presence of mixed valence cations not only produced Faraday pseudocapacitance, but also led to good metalloid conductivity
    .
    In 1 M H2SO4 electrolyte, a surface capacitance of 226 mF cm-2 was obtained at a current density of 0.
    5 mA cm-2, which was much higher than that of 0.
    2 mF cm-2 similar to Nb2O5 electrode, and also reached the highest level
    of metal nitride nanostructured thin film electrode.
    The current density increases to 10 mA cm-2 and remains at 137 mF cm-2, illustrating good rate performance
    .
    In addition, through the polymerization and carbonization of dopamine, the Nb4N5 nanoporous thin film electrode is coated with an ultra-thin carbon film, which significantly improves the cycle stability, and the capacitance retention rate increases to nearly 100%
    after 2000 cycles of voltammetry.
    Studies have shown that carbon-coated Nb4N5 nanoporous films can form two-electrode symmetric devices, which have good practical application potential
    .

    This new supercapacitor material Nb4N5 nanoporous film can also be used as a good support to deposit other active materials to form a composite electrode; It is also expected to be used in other energy-related applications
    .
    The preparation method of the material is simple and reliable, with excellent morphology and structure, superior electrochemical performance, and can be generalized to Ti, W, Zr, Nb and Ta systems, which provides a good idea
    for the development and design of new nitride and oxide nitride superelectric electrode materials.

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