Controlling the actuation properties of MXene paper electrodes upon cation intercalation
Controlling the actuation properties of MXene paper electrodes upon cation intercalation
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DOI：
10.1016/j.nanoen.2015.07.028
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发表时间：
2015-10-01
期刊：
影响因子：
17.6
通讯作者：
Balke, Nina
中科院分区：
文献类型：
--
作者：
Come, Jeremy;Black, Jennifer M.;Balke, Nina
使用原子力显微镜原位监测分层 Ti3C2 纸电极在各种水性电解质中充电/放电期间的宏观变形，以检查阳离子嵌入对电化学行为和机械响应的影响。结果表明电极变形对阳离子尺寸和电荷有很强的依赖性。该电极在 Li、Na+ 或 Mg2+ 嵌入过程中会经历较大的收缩，这使得 Ti3C2 纸与传统电极不同，在传统电极中，离子（例如 Li）氧化还原嵌入到体相（例如石墨、硅）中会导致体积膨胀。这一特性可以解释 MXene 具有出色的倍率性能和循环性能。我们还证明了机电收缩的变化可以通过电解质交换轻松调节，并显示出基于二维金属碳化物的执行器设计的有趣特征。 (C) 2015 Elsevier Ltd. 保留所有权利。
Atomic force microscopy was used to monitor the macroscopic deformation in a delaminated Ti3C2 paper electrode in situ, during charge/discharge in a variety of aqueous electrolytes to examine the effect of the cation intercalation on the electrochemical behavior and mechanical response. The results show a strong dependence of the electrode deformation on cation size and charge. The electrode undergoes a large contraction during Li, Na+ or Mg2+ intercalation, differentiating the Ti3C2 paper from conventional electrodes where redox intercalation of ions (e.g. Li) into the bulk phase (e.g. graphite, silicon) results in volumetric expansion. This feature may explain the excellent rate performance and cyclability reported for MXenes. We also demonstrated that the variation of the electromechanical contraction can be easily adjusted by electrolyte exchange, and shows interesting characteristics for the design of actuators based on 2D metal carbides. (C) 2015 Elsevier Ltd. All rights reserved.