Interdigitated MXene-based electrodes for zinc-ion micro-capacitors

With the rapid development of wearable and portable electronics, flexible micro-energy storage devices are urgently required. Notably, flexible interdigitated zinc-ion micro-capacitors (ZIMCs) have attracted much attention due to their low cost, safety, and high energy storage properties. In terms of the electrode materials for interdigitated ZIMCs, the emerging two-dimensional (2D) materials known as MXenes are ideal candidates due to an MXene’s unique layered structure, ultra-high electronic conductivity, and high charge storage capability. Interdigitated ZIMCs using MXene-based electrodes have already made considerable progress, from their electrochemical mechanisms to their electrode configurations, although some challenges still exist. In this review, we comprehensively summarize current progress in MXene-based interdigitated ZIMCs, including research understanding about the energy storage mechanism, the fabrication techniques for MXene-based electrodes, and their properties for zinc-ion energy storage. We also discuss the existing challenges and offer perspectives on the prospects for MXene-based interdigitated ZIMCs. • This review comprehensively summarizes the research progress on MXene-based interdigitated ZIMCs, according to the various fabrication techniques (e.g., 3D printing, spraying, laser engraving). • The energy storage mechanisms of the different configurations of MXene-based interdigitated ZIMCs and their performance characteristics are systematically elucidated. • The challenges and prospects for MXene-based interdigitated ZIMCs are outlined.