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首页> 外文期刊>Electrochimica Acta >x(Mn 4+, Mn 3+) 2O 4·1.5H 2O] with high areal mass loading]]>
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x(Mn 4+, Mn 3+) 2O 4·1.5H 2O] with high areal mass loading]]>

机译：“place =”post“> 4 + ，mn 3 + ） 2 O 4 ·1.5H 2 O]，具有高领域大众装载]] >

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摘要

The supercapacitance performance of birnessite, which is a common layered manganese oxide mineral with the general formula of (Na, K, Ca)x(Mn4+, Mn3+)2O4·1.5H2O, is greatly hindered by poor electrical conductivity, especially when the areal mass loading of the active materials is high enough for practical application. Heterogeneous atom doping is an effective way for improving the supercapacitance performance of birnessite. Herein, we mainly investigate the influence of Fe doping on the crystal structure, electronic structure and capacitance performance of birnessite [(Na, K)x(Mn4+, Mn3+)2O4·1.5H2O] in detail by combining the experiments and theoretical calculations/simulations. It is found that Fe atoms mainly substitute the central trivalent Mn in [MnO6] octahedral after doping without changing the crystalline phase of birnessite. Meanwhile, the particle size and surface area of Fe-doped birnessite continuously increase with the increase of the content of Fe dopant. On the other hand, the electronic conductivity of the doped birnessite firstly increases and then decreases with the increase of the Fe content due to the reduced indirect band gap and the increased number of the boundary/grain interfaces. Based on these results, the influences of Fe doping on the supercapacitance performance of birnessite electrode with very high areal mass loading of ～10–12?mg?cm?2are elaborately discussed related to morphology, structure, electrical conductivity, and ion diffusion properties.
机译：Birnerityite的超级电容性能，其是一种常见的层状氧化锰矿物，其通式（Na，K，Ca）×（Mn4 +，Mn3 +）2O4·1.5H2O，通过差的导电性极大地阻碍，特别是当区域质量时活性材料的装载足够高，以便实际应用。异质原子掺杂是改善BiRnerneryite的超级电压性能的有效途径。在此，通过组合实验和理论计算/模拟，我们主要研究Fe掺杂对Birneryite [（Na，K）X（MN4 +，MN3 +）2O4·1.5H2O]的晶体结构，电子结构和电容性能的影响。发现Fe原子主要在掺杂后替代中央三价Mn，而不改变BiRnerneyite的结晶相。同时，由于Fe掺杂剂的含量的增加，Fe掺杂的Birnernyite的粒度和表面积不断增加。另一方面，掺杂的BIRNETITYITE的电子电导率首先增加，然后随着Fe含量的增加而导致的间接带隙和边界/晶粒界面的数量增加，随着Fe含量的增加。基于这些结果，Fe掺杂对BiRnerite电极超高孔径性能的影响，具有非常高的面积质量负荷〜10-12Ω·mg？cm 2的βcm2。讨论与形态，结构，导电性和离子扩散性能相关的。

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  • 来源
    《Electrochimica Acta》 |2018年第2018期|共10页
  • 作者

    Hao Liu; Wenlong Gu; Bingcheng Luo; Peng Fan; Libing Liao; Enke Tian; Yaoqi Niu; Jinzhou Fu; Zhen Wang; Yuanyuan Wu; Guocheng Lv; Lefu Mei;

  • 作者单位

    School of Science China University of Geosciences;

    Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences;

    State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University;

    Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences;

    Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences;

    School of Science China University of Geosciences;

    School of Science China University of Geosciences;

    Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences;

    School of Science China University of Geosciences;

    School of Science China University of Geosciences;

    Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences;

    Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 电化学工业;物理化学（理论化学）、化学物理学;
  • 关键词

    Birnessite; Fe doping; Crystal structure; Electronic structure; Supercapacitor;

    机译：Birniedite;Fe掺杂;晶体结构;电子结构;超级电容器;

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