The current development of flexible and wearable electronics concentrates on the continuous miniaturization and diversified integration of micro-scale power sources. Micro-sized energy storage devices, such as micro-supercapacitors and micro-batteries, have attracted more and more attention due to the rapid development of mobile electronics, wireless sensors, and medical implants. Among these micro-sized energy storage devices, in-plane micro-supercapaciters, which possess in-plane, separator-free and Si-technology compatible features, have shown diverse potential for multiple applications. Towards the future development and practical utilization of electrochemical energy storage devices, graphene is considered as one of the key materials, which however yet suffers from up-scalable preparation with controlled quality. As a number of interesting two-dimensional (2D) materials have been developed in recent years, in this lecture, not only the recent progress on electrochemically exfoliated graphene (EG), but also other novel 2D materials beyond graphene will be presented. In the second part, we will demonstrate the fabrication of ultrathin in-plane micro-supercapacitors based on these 2D materials and their nanocomposites, e.g. graphene-based 2D nanohybrids, 2D mesoporous polypyrrole sheets, 2D thiophene nanosheets, 2D coordination polymer frameworks, etc. The fabricated devices exhibit an unprecedented areal and/or stacked capacitances, excellent cycling stability, and ultrahigh rate of up to 2000 V s-1. Moreover, high-performance, thin-film, flexible micro-supercapacitors will be demonstrated. The future prospects of such new-generation micro-energy devices and technologies will be also provided.

Two-dimensional materials for in-plane micro-supercapacitors

254th National Meeting (2017)

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