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首页> 外文期刊>Advanced energy materials >Solving the Capacitive Paradox of 2D MXene using Electrochemical Quartz-Crystal Admittance and In Situ Electronic Conductance Measurements
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Solving the Capacitive Paradox of 2D MXene using Electrochemical Quartz-Crystal Admittance and In Situ Electronic Conductance Measurements

机译：使用电化学石英-晶体导纳和原位电导测量来解决2D MXene的电容悖论

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摘要

Fast ion adsorption processes in supercapacitors enable quick storage/delivery of significant amounts of energy, while ion intercalation in battery materials leads to even larger amounts of energy stored, but at substantially lower rates due to diffusional limitations. Intercalation of ions into the recently discovered 2D Ti3C2Tx (MXene) occurs with a very high rate and leads to high capacitance, posing a paradox. Herein, by characterizing the mechanical deformations of MXene electrode materials at various states-of-charge with a variety of cations (Li, Na, K, Cs, Mg, Ca, Ba, and three tetra­alkylammonium cations) during cycling by electrochemical quartz-crystal admittance (EQCA, quartz-crystal microbalance with dissipation monitoring) combined with in situ electronic conductance and electrochemical impedance, light is shone on this paradox. Based on this work, it appears that the capacitive paradox stems from cationic insertion, accompanied by significant deformation of the MXene particles, that occurs so rapidly so as to resemble 2D ion adsorption at solid-liquid interfaces. The latter is greatly facilitated by the presence of water molecules between the MXene sheets.
机译：超级电容器中的快速离子吸附过程能够快速存储/输送大量能量，而电池材料中的离子嵌入会导致甚至更大数量的能量存储，但由于扩散限制，速率要低得多。离子以极高的速率插入到最近发现的2D Ti3C2Tx（MXene）中，并导致高电容，这造成了悖论。在此，通过表征在不同电荷状态下MXene电极材料在通过电化学石英晶体循环过程中具有各种阳离子（Li，Na，K，Cs，Mg，Ca，Ba和三个四烷基铵阳离子）的机械变形，导纳（EQCA，带有耗散监测的石英晶体微量天平）与原位电导率和电化学阻抗相结合，将光照在这个悖论上。基于这项工作，似乎电容性悖论源于阳离子插入，伴随着MXene颗粒的明显变形，这种变形如此迅速地发生，以至于固液界面上的二维离子吸附。在MXene片之间存在水分子极大地促进了后者。

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  • 来源
    《Advanced energy materials》 |2015年第1期|1-11|共11页
  • 作者

    Mikhael D. Levi; Maria R. Lukatskaya; Sergey Sigalov; Majid Beidaghi; Netanel Shpigel; Leonid Daikhin; Doron Aurbach; Michel W. Barsoum; Yury Gogotsi;

  • 作者单位

    Department of Chemistry Bar-Ilan University Ramat-Gan Israel;

    Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute Drexel University Philadelphia PA USA;

    Department of Chemistry Bar-Ilan University Ramat-Gan Israel;

    Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute Drexel University Philadelphia PA USA;

    Department of Chemistry Bar-Ilan University Ramat-Gan Israel;

    Department of Chemistry Bar-Ilan University Ramat-Gan Israel;

    School of Chemistry Raymond and Beverly Sackler Faculty of Exact Sciences Tel-Aviv University Ramat Aviv Israel;

    Department of Chemistry Bar-Ilan University Ramat-Gan Israel;

    Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute Drexel University Philadelphia PA USA;

    Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute Drexel University Philadelphia PA USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    MXene; 2D materials; capacitance; supercapacitors; conductance;

    机译：MXene;2D材料;电容;超级电容器;电导;

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