S.H. Zheng, H. Wang, P. Das, Y. Zhang, Y.X. Cao, J.X. Ma, S.Z. (Frank) Liu,* and Z.-S. Wu*

Advanced Materials, 2021, 33, 2005449.

DOI: 10.1002/adma.202005449 [PDF]

The future of mankind holds great promise for things like the Internet of Things, personal health monitoring systems and smart cities. To achieve this ambitious goal, it is imperative for electronics to be wearable, environmentally sustainable and safe. However, large-scale manufacture of self-sufficient electronic systems by exploiting multifunctional materials still faces significant hurdles. Herein,we reportmultitasking aqueous printable MXene inks as an additive-free high-capacitance electrode, sensitive pressure-sensing material, highly conducting current collector, metal-free interconnector and conductive binder. By directly screen printing MXene inks,MXene-based micro-supercapacitors (MSCs) and lithium ion micro-batteries (LIMBs) are delicately fabricated on various substrates. The as-prepared MSCs exhibit ultrahigh areal capacitance of 1.1 F/cm²and the serially-connected MSCs offer a record voltage of 60 V. The quasi-solid-state LIMBs deliver a robust areal energy density of 154 μWh/cm². Furthermore, an all-flexible self-powered integrated system on a single substrate based on multitasking MXene inks is demonstrated through seamless integration of a tandem solar cell, LIMB and MXene hydrogel pressure sensor. Notably, this integrated system is exceptionally sensitive to body movements with a fast response time of 35 ms. Therefore,this multipurpose MXene ink opens a new avenue for creating printable self-powered standalone microsystems for powering future smart appliances.