Entire ultrathin two-dimensional pseudocapacitive nanosheets with high active covalent groups for flexible asymmetric all-solid-state micro-pseudocapacitors with high energy density and long cycle life.

Micro-supercapacitors (MSCs) are gradually emerging as a strong contender for the next wearable and portable micro-energy storage devices. Low energy density and poor stability are significant challenges to their widespread application. Based on this, a novel asymmetric all-solid-state Micro-pseudocapacitors (AMPCs) is designed elaborately, in which all the active materials are based on conducting two-dimensional (2D) materials with thin lamellar thickness and active covalent groups on the surface.