Asymmetric Flexible MXene-Reduced Graphene Oxide Micro-Supercapacitor
Asymmetric Flexible MXene-Reduced Graphene Oxide Micro-Supercapacitor
复制标题
DOI：
10.1002/aelm.201700339
复制
发表时间：
2018-01-01
影响因子：
6.2
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
--
作者：
Couly, Cedric;Alhabeb, Mohamed;Gogotsi, Yury
目前微型超级电容器的微制造通常涉及多步处理和精细的光刻方案。在这项研究中，简单地制造一个不对称的MXene为基础的微型超级电容器，是灵活的，无粘合剂，和集电器的自由报道。使用定制的掩模和可扩展的喷涂技术在柔性透明基板上制造叉指型器件架构。电极材料由碳化钛MXene（Ti 3C 2 Tx）和还原的氧化石墨烯（rGO）组成，这两种材料都是2D层状材料，有助于交叉电极结构中的快速离子扩散。这种基于MXene的非对称微型超级电容器在1V电压窗口下工作，同时在一万次循环后保持97%的初始电容，并且在0.2W cm-3的功率密度下表现出8.6mW h cm-3的能量密度。此外，这些微型超级电容器在机械弯曲期间显示出高水平的柔性。利用Ti 3C 2 Tx-MXene电极在水性电解质中在负电位下操作的能力，表明在不对称架构中使用Ti 3C 2 Tx作为负电极并且使用rGO作为正电极是用于增加微型超级电容器的能量和功率密度的有前途的策略。
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 (Ti3C2Tx) 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 Ti3C2Tx-MXene electrodes to operate at negative potentials in aqueous electrolytes, it is shown that using Ti3C2Tx 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.