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首页> 外文期刊>Advanced Functional Materials >Morphological and Electrochemical Cycling Effects in MnO_2 Nanostructures by 3D Electron Tomography
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Morphological and Electrochemical Cycling Effects in MnO_2 Nanostructures by 3D Electron Tomography

机译：3D电子断层扫描在MnO_2纳米结构中的形貌和电化学循环效应

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摘要

In this study, MnO_2 nanostructures with well-controlled morphology and crystal phase are successfully prepared by chemical synthesis, and characterized by three-dimensional electron tomography for use as super-capacitor electrode materials. The growth process of the various MnO_2 nanostructures is revealed in detail, and correlated to their electrochemical performance as supercapacitor materials. The specific capacitance of MnO_2 electrodes is found to be strongly correlated with the inner morphology and crystal phase of the MnO_2 nanostructures. Furthermore, it is demonstrated that the increased capacity with electrochemical cycling of the materials is due to the formation of defective regions embedded in the MnO_2 nanostructures; these regions form during electrochemical cycling of the electrodes, resulting in increased porosity, surface area, and consequently, increased electrochemical capacity.
机译：在这项研究中，通过化学合成成功地制备了形态和晶相得到很好控制的MnO_2纳米结构，并通过三维电子断层扫描对其进行了表征，以用作超级电容器电极材料。详细揭示了各种MnO_2纳米结构的生长过程，并与它们作为超级电容器材料的电化学性能相关。发现MnO_2电极的比电容与MnO_2纳米结构的内部形态和晶相密切相关。此外，已证明材料的电化学循环容量增加是由于嵌入MnO_2纳米结构的缺陷区的形成。这些区域在电极的电化学循环期间形成，导致孔隙率，表面积增加，并因此导致电化学容量增加。

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  • 来源
    《Advanced Functional Materials》 |2014年第21期|3130-3143|共14页
  • 作者

    Wei Chen; Raghavan B. Rakhi; Qingxiao Wang; Mohamed N. Hedhili; Husam N. Alshareef;

  • 作者单位

    Materials Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal, 23955-6900, Saudi Arabia;

    Materials Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal, 23955-6900, Saudi Arabia;

    Advanced Imaging and Characterization Laboratory, KAUST Thuwal, 23955-6900, Saudi Arabia;

    Advanced Imaging and Characterization Laboratory, KAUST Thuwal, 23955-6900, Saudi Arabia;

    Materials Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal, 23955-6900, Saudi Arabia;

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