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The Charge Storage Mechanisms of 2D Cation-Intercalated Manganese Oxide in Different Electrolytes

机译：二维阳离子插层氧化锰在不同电解质中的电荷存储机理

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摘要

2D ion-intercalated metal oxides are emerging promising new electrodes for supercapacitors because of their unique layered structure as well as distinctive electronic properties. To facilitate their application, fundamental study of the charge storage mechanism is required. Herein, it is demonstrated that the application of in situ Raman spectroscopy and electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D), provides a sufficient basis to elucidate the charge storage mechanism in a typical 2D cation-intercalated manganese oxide (Na0.55Mn2O4 center dot 1.5H(2)O, abbreviated as NMO) in neutral and alkaline aqueous electrolytes. The results reveal that in neutral Na2SO4 electrolytes, NMO mainly displays a surface-controlled pseudocapacitive behavior in the low potential region (0-0.8 V), but when the potential is higher than 0.8 V, an intercalation pseudocapacitive behavior becomes dominant. By contrast, NMO shows a battery-like behavior associated with OH- ions in alkaline NaOH electrolyte. This study verifies that the charge storage mechanism of NMO strongly depends on the type of electrolyte, and even in the same electrolyte, different charging behaviors are revealed in different potential ranges which should be carefully taken into account when optimizing the use of the electrode materials in practical energy-storage devices.
机译：二维离子嵌入金属氧化物因其独特的层状结构以及独特的电子性能而成为超级电容器的有希望的新型电极。为了促进其应用，需要对电荷存储机制进行基础研究。本文证明了原位拉曼光谱和带耗散监测的电化学石英晶体微量天平（EQCM-D）的应用为阐明典型的二维阳离子嵌入锰氧化物（Na0.55Mn2O4）中的电荷存储机理提供了充分的基础。中心点1.5H（2）O，缩写为NMO）在中性和碱性水性电解质中。结果表明，在中性Na2SO4电解质中，NMO主要在低电势区域（0-0.8 V）中显示表面控制的伪电容行为，但是当电势高于0.8 V时，插层拟电容行为将占主导地位。相比之下，NMO在碱性NaOH电解质中表现出与OH-离子相关的电池状行为。这项研究验证了NMO的电荷存储机制在很大程度上取决于电解质的类型，即使在相同的电解质中，在不同的电位范围内也会显示出不同的充电行为，在优化电极材料的使用时应仔细考虑这些电荷行为。实用的储能装置。

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  • 来源
    《Advanced energy materials》 |2019年第3期|1802707.1-1802707.10|共10页
  • 作者

    Zhang Qingnuan; Levi Mikhael D.; Dou Qingyun; Lu Yulan; Chai Yinguang; Lei Shulai; Ji Hengxing; Liu Bao; Bu Xudong; Ma Pengjun; Yan Xingbin;

  • 作者单位

    Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China;

    Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China|Univ Chinese Acad Sci, Ctr Mat Sci & Opoelect Engn, Beijing 100080, Peoples R China;

    Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Gansu, Peoples R China;

    Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China;

    Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China|Univ Chinese Acad Sci, Ctr Mat Sci & Opoelect Engn, Beijing 100080, Peoples R China;

    Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China|Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116000, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    cation-intercalated manganese oxide; charge storage mechanism; electrochemical quartz crystal microbalance; operando Raman; supercapacitors;

    机译：阳离子插层氧化锰;电荷存储机理;电化学石英晶体微量天平;拉曼拉曼;超级电容器;

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