Fe2O3 Nanoparticles Anchored on the Ti3C2Tx MXene Paper for Flexible Supercapacitors with Ultrahigh Volumetric Capacitance
Fe2O3 Nanoparticles Anchored on the Ti3C2Tx MXene Paper for Flexible Supercapacitors with Ultrahigh Volumetric Capacitance
复制标题
锚定在 Ti3C2TX MXene 纸上的 Fe2O3 纳米粒子用于具有超高体积电容的柔性超级电容器
DOI：
10.1021/acsami.0c11034
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发表时间：
2020-09-16
影响因子：
9.5
通讯作者：
Lan, Wei
中科院分区：
文献类型：
--
作者：
Ma, Yonglu;Sheng, Hongwei;Lan, Wei
Ti 3C 2 Tx MXene具有高导电性和柔性，在可穿戴储能器件中引起了极大的关注。然而，容易的纳米片重堆积现象极大地限制了基于Ti 3C 2 Tx的超级电容器可实现的电化学性能，特别是体积电容。在此，我们报告了一个灵活的混合纸组成的Fe 2 O3纳米粒子（NPs）锚定在Ti 3C 2 Tx（Fe 2 O3 NPs@MX）通过静电自组装和退火处理。通过掺入Fe 2 O3纳米颗粒，有效地扩大了Ti 3C 2 Tx纳米片的层间距，允许更多的电化学活性位点来存储电荷。同时，Ti 3C 2 Tx纳米片形成连续的金属骨架，抑制Fe 2 O3纳米颗粒在充放电过程中的体积膨胀，提高循环稳定性。与纯Ti 3C 2 Tx和Fe 2 O3的电化学性能相比，该柔性的纳米（4.1 μ m）Fe 2 O3 NPs@MX杂化纸显示出显著改善的电化学性能，包括1 V的宽电位窗口、类似于2607 F cm（-3）（584 F g（-1））的纳米体积电容以及13，000次循环后的优异电容保持率。此外，组装的对称固态超级电容器具有29.7 Wh L-1的能量密度和优异的机械柔性。我们相信，目前的纳米结构设计，装饰纳米粒子在一个二维的金属网络，具有普遍适用性，并可用于制造高效的复合材料，先进的储能设备。
Ti3C2Tx MXene, with high conductivity and flexibility, has drawn great attention in the wearable energy storage devices. However, the easy nanoflake-restacking phenomenon greatly restricts the achievable electrochemical performance of Ti3C2Tx-based supercapacitors, in particular volumetric capacitance. Herein, we report a flexible hybrid paper consisting of Fe2O3 nanoparticles (NPs) anchored on Ti3C2Tx (Fe2O3 NPs@MX) via electrostatic self-assembly and annealing treatments. The interlayer spacing of Ti3C2Tx nanoflakes is effectively enlarged through the incorporation of Fe2O3 NPs, allowing more electrochemical active sites to store charge. Meanwhile, Ti3C2Tx nanoflakes form a continuous metallic skeleton and inhibit the volume expansion of Fe2O3 NPs during the charging/discharging process, enhancing the cycling stability. The flexible, ultrathin (4.1 mu m) Fe2O3 NPs@MX hybrid paper shows considerably improved electrochemical performances compared to those of pure Ti3C2Tx and Fe2O3, including a wide potential window of 1 V, an ultrahigh volumetric capacitance of similar to 2607 F cm(-3) (584 F g(-1)), and excellent capacitance retention after 13,000 cycles. Besides, the as-assembled symmetric solid-state supercapacitor exhibits an energy density of 29.7 Wh L-1 and excellent mechanical flexibility. We believe that the present nanostructure design, decorating NPs within a twodimensional metallic network, has general applicability and could be used to fabricate highly efficient composites for advanced energy storage devices.