Current microfabrication of micro‐supercapacitors often involves multistep processing and delicate lithography protocols. In this study, simple fabrication of an asymmetric MXene‐based micro‐supercapacitor that is flexible, binder‐free, and current‐collector‐free is reported. The interdigitated device architecture is fabricated using a custom‐made mask and a scalable spray coating technique onto a flexible, transparent substrate. The electrode materials are comprised of titanium carbide MXene (Ti₃C₂T_x) and reduced graphene oxide (rGO), which are both 2D layered materials that contribute to the fast ion diffusion in the interdigitated electrode architecture. This MXene‐based asymmetric micro‐supercapacitor operates at a 1 V voltage window, while retaining 97% of the initial capacitance after ten thousand cycles, and exhibits an energy density of 8.6 mW h cm⁻³ at a power density of 0.2 W cm⁻³. Further, these micro‐supercapacitors show a high level of flexibility during mechanical bending. Utilizing the ability of Ti₃C₂T_x‐MXene electrodes to operate at negative potentials in aqueous electrolytes, it is shown that using Ti₃C₂T_x as a negative electrode and rGO as a positive one in asymmetric architectures is a promising strategy for increasing both energy and power densities of micro‐supercapacitors.

中文翻译：

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非对称柔性MXene还原氧化石墨烯微超级电容器

当前的微型超级电容器的微细加工通常涉及多步处理和精细的光刻工艺。在这项研究中，报道了一种简单的，不对称的，基于MXene的微型超级电容器的制造方法，该电容器具有柔性，无粘合剂和无集电器。使用定制的掩模和可扩展的喷涂技术，在柔性，透明的基板上制造叉指式设备体系结构。电极材料由碳化钛MXene（Ti ₃ C ₂ T _x）和还原的氧化石墨烯（rGO），它们都是二维层状材料，有助于叉指式电极结构中的快速离子扩散。这款基于MXene的不对称微超级电容器在1 V电压窗口下工作，在一万次循环后仍保留了97％的初始电容，并在0.2 W cm-的功率密度下表现出8.6 mW h cm ^-3的能量密度^{- 3}。此外，这些微型超级电容器在机械弯曲过程中显示出很高的柔韧性。利用Ti ₃ C ₂ T _x -MXene电极在水性电解质中在负电势下运行的能力，表明使用Ti ₃ C ₂ T _x 在不对称架构中，作为负电极和rGO作为正电极是增加微超级电容器能量和功率密度的一种有前途的策略。