MXene ink printing of high-performance micro-supercapacitors

The addition of two-dimensional MXene materials gives micro-supercapacitors (MSCs) the advantages of higher power density, faster charging and discharging speeds, and longer lifetimes. To date, various fabrication methods and strategies have been used to finely synthesize MXene electrodes. However, different technologies not only affect the electrode structure of MXene but also directly affect the performance of MSCs. Here, we provide a comprehensive and critical review of the design and microfabrication strategies for MXene's fork-finger microelectrodes. First, we provide a systematic overview of micromachining techniques applied to MXene, including graphic cutting, screen-printing, 3D printing, inkjet, and stamp methods. In addition, we discuss in detail the advantages and disadvantages of these machining techniques, summarizing the environment in which the technique is used and the results expected to be achieved. Finally, the challenges as well as the outlook for future applications are summarized to promote the further development of MXene materials in the field of MSCs.