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Revealing the Pseudo-Intercalation Charge Storage Mechanism of MXenes in Acidic Electrolyte

机译：揭示酸性电解质中MXene的伪插层电荷存储机制

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摘要

Since the discovery of Ti3C2Tx in 2011, the family of two-dimensional transition metal carbides, carbonitrides, and nitrides (collectively known as MXenes) has quickly attracted the attention of those developing energy storage applications such as electrodes for supercapacitors with acidic aqueous electrolytes. The excellent performance of these MXenes is attributed to a pseudocapacitive energy storage mechanism, based on the non-rectangular shape of cyclic voltammetry curves and changes in the titanium oxidation state detected by in situ X-ray absorption spectroscopy. However, the pseudocapacitive mechanism is not well understood and no dimensional changes due to proton insertion have been reported. In this work, in situ X-ray diffraction and density functional theory are used to investigate the charge storage mechanism of Ti3C2Tx in 1 m H2SO4. Results reveal that a 0.5 angstrom expansion and shrinkage of the c-lattice parameter of Ti3C2Tx occur during cycling in a 0.9 V voltage window, showing that the charge storage mechanism is intercalation pseudocapacitance with implication for MXene use in energy storage and electrochemical actuators.
机译：自2011年发现Ti3C2Tx以来，二维过渡金属碳化物，碳氮化物和氮化物（统称为MXene）家族迅速吸引了那些正在发展的储能应用领域，例如带有酸性水性电解质的超级电容器电极。这些MXene的出色性能归因于伪电容储能机制，其基于循环伏安曲线的非矩形形状以及通过原位X射线吸收光谱法检测到的钛氧化态的变化。但是，对伪电容的机理还没有很好的理解，也没有因质子插入而引起尺寸变化的报道。在这项工作中，原位X射线衍射和密度泛函理论用于研究Ti3C2Tx在1 m H2SO4中的电荷存储机理。结果表明，在0.9 V电压窗口内循环期间，Ti3C2Tx的c晶格参数发生了0.5埃的膨胀和收缩，表明电荷存储机制是插层拟电容，这意味着在储能和电化学致动器中使用MXene。

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  • 来源
    《Advanced Functional Materials》 |2019年第29期|1902953.1-1902953.6|共6页
  • 作者

    Mu Xinpeng; Wang Dashuai; Du Fei; Chen Gang; Wang Chunzhong; Wei Yingjin; Gogotsi Yury; Gao Yu; DallAgnese Yohan;

  • 作者单位

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China;

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China;

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China|Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Jilin, Peoples R China;

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China|Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Jilin, Peoples R China;

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China;

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China;

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China|Drexel Univ, AJ Drexel Nanomat Inst, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA;

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China;

    Jilin Univ, Coll Phys, Key Lab Phys & Technol Adv Batteries, Minist Educ, Changchun 130012, Jilin, Peoples R China|UCL, Inst Mat Discovery, London WC1E 7JE, England;

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  • 正文语种 eng
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  • 关键词

    2D materials; density functional theory; in situ X-ray diffraction; MXenes; supercapacitors;

    机译：二维材料密度泛函理论原位X射线衍射MXenes超级电容器;

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