Currently, the MXene-based flexible supercapacitors have caused much attention due to their excellent mechanical performance and novel electrical property. However, the aggregation and rearrangement of MXene nanosheets in the process of electrode preparation limit their electrochemical performance. Herein, a kind of novel MXene/N-doped carbon foam (MXene/NCF) compressible composite with three-dimensional (3D) hollow interconnected neuron-like architecture is directly prepared by one-step pyrolysis and used for the freestanding, highly compressible supercapacitors. The synergistic effect exists in the MXene/NCF composite when applied to supercapacitors: NCF can provide the additional pseudocapacitance by N atom doping and simultaneously supports the MXene nanosheets to construct the 3D hollow interconnected neuron-like architecture for supplying highly stable, efficient channels for ion diffusion/electron transport and more contact sites, and that the MXene enhances conductivity and hydrophilicity. Therefore, the freestanding MXene/NCF electrode shows a remarkable gravimetric capacitance of 332 F g^–1 and volumetric capacitance of 3162 mF cm^–3, superior rate performance of 64% (from 0.5 to 100 A g^–1), and 99.2% capacity retention after 10,000 cycles. Significantly, the MXene/NCF-based all solid-state supercapacitors still show a high specific capacitance and a large rate performance. In addition, the device can be compressed arbitrarily under 60% strain with almost no change in morphology and electrochemical property. These excellent properties expect that the MXene/NCF composite has broad applications in the field of flexible supercapacitors.

中文翻译：

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具有3D空心神经元样结构的MXene / N掺杂碳泡沫，用于独立式，高度可压缩的全固态超级电容器。

当前，基于MXene的柔性超级电容器由于其优异的机械性能和新颖的电性能而引起了广泛的关注。然而，在电极制备过程中，MXene纳米片的聚集和重排限制了它们的电化学性能。本文通过一步热解法直接制备了一种新型的具有三维（3D）中空互连神经元样结构的新型MXene / N掺杂碳泡沫（MXene / NCF）可压缩复合材料，并用于独立的，高度可压缩的超级电容器。 。当应用于超级电容器时，MXene / NCF复合物中存在协同效应：NCF可以通过N原子掺杂提供额外的伪电容，并同时支持MXene纳米片来构建3D空心互连神经元状体系结构，从而为离子扩散/电子传输和更多的接触部位提供高度稳定，有效的通道，并且MXene可以增强导电性和亲水性。因此，独立式MXene / NCF电极具有332 F g的显着重量电容^–1和3162 mF cm ^–3的体积电容，64％的优异倍率性能（从0.5至100 A g ^–1）和10,000次循环后99.2％的容量保持率。值得注意的是，基于MXene / NCF的所有固态超级电容器仍显示出高比电容和高倍率性能。此外，该器件可以在60％的应变下任意压缩，形态和电化学性能几乎没有变化。这些优异的性能期望MXene / NCF复合材料在柔性超级电容器领域具有广泛的应用。