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首页> 外文期刊>Advanced energy materials >Achieving High Pseudocapacitance of 2D Titanium Carbide (MXene) by Cation Intercalation and Surface Modification
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Achieving High Pseudocapacitance of 2D Titanium Carbide (MXene) by Cation Intercalation and Surface Modification

机译：通过阳离子插层和表面改性实现2D碳化钛（MXene）的高伪电容

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摘要

Supercapacitors attract great interest because of the increasing and urgent demand for environment-friendly high-power energy sources. Ti3C2, a member of MXene family, is a promising electrode material for supercapacitors owing to its excellent chemical and physical properties. However, the highest gravimetric capacitance of the MXene-based electrodes is still relatively low (245 F g(-1)) and the key challenge to improve this is to exploit more pseudo-capacitance by increasing the active site concentration. Here, a method to significantly improve the gravimetric capacitance of Ti3C2Tx MXenes by cation intercalation and surface modification is reported. After K+ intercalation and terminal groups (OH-/F-) removing, the intercalation pseudocapacitance is three times higher than the pristine MXene, and MXene sheets exhibit a significant enhancement (about 211% of the origin) in the gravimetric capacitance (517 F g(-1) at a discharge rate of 1 A g(-1)). Moreover, the as-prepared electrodes show above 99% retention over 10 000 cycles. This improved electrochemical performance is attributed to the large interlayer voids of Ti3C2 and lowest terminated surface group concentration. This study demonstrates a new strategy applicable to other MXenes (Ti2CTx, Nb2CTx, etc.) in maximizing their potential applications in energy storage.
机译：超级电容器由于对环境友好的大功率能源的日益迫切的需求而引起了极大的兴趣。 Ti3C2是MXene系列的成员，由于其出色的化学和物理特性，是一种有前途的超级电容器电极材料。但是，基于MXene的电极的最高重量电容仍然相对较低（245 F g（-1）），要改善这一点，关键的挑战是通过增加活性位点浓度来利用更多的伪电容。在此，报道了一种通过阳离子嵌入和表面改性显着提高Ti3C2Tx MXene的重量电容的方法。除去K +插层和末端基团（OH- / F-）后，插层拟电容是原始MXene的三倍，并且MXene片的重量电容（517 F g）显着提高（约为原点的211％）。 （-1）以1 A g（-1）的放电速率放电。此外，所制备的电极在10000次循环中显示出99％以上的保留率。这种改进的电化学性能归因于Ti3C2的较大的层间空隙和最低的终止表面基团浓度。这项研究展示了一种适用于其他MXene（Ti2CTx，Nb2CTx等）的新策略，可最大程度地发挥其在储能方面的潜在应用。

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  • 来源
    《Advanced energy materials》 |2017年第15期|1602725.1-1602725.8|共8页
  • 作者

    Li Jian; Yuan Xiaotao; Lin Cong; Yang Yanquan; Xu Le; Du Xin; Xie Jinglin; Lin Jianhua; Sun Junliang;

  • 作者单位

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China;

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China;

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China|Chongqing Univ, Coll Chem & Chem Engn, 174 Shazheng St, Chongqing 400044, Peoples R China;

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China;

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China;

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China;

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China;

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China;

    Peking Univ, Coll Chem & Mol Engn, Yiheyuan Rd 5, Beijing 100871, Peoples R China;

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