Hydrogen-Bond Locking of MXene/Chitin Biocompatible Electrodes for Flexible Supercapacitors

Designing efficient ion transport channels in MXene-based flexible electrodes is crucial yet challenging for high-rate supercapacitors. Herein, a biocompatible hydrogen-bonding crosslinking strategy is presented to construct patterned MXene/chitin microsphere (CM) electrodes. Surface modification of MXene nanosheets with oxygen-containing groups, coupled with the natural polymer chitin, establishes a robust porous network stabilized by intensive hydrogen bonds. This unique architecture effectively mitigates self-restacking, reduces ion diffusion tortuosity, and exposes abundant active sites, leading to remarkable electrochemical performance with high capacitance of 421.5 F g^-1 and superior cycling stability (85.72% retention after 10 000 cycles). The successful fabrication of customizable patterns via a simple vacuum filtration method highlights their practicality for flexible digital devices. This study provides fundamental insights into non-covalent interaction-driven electrode engineering, offering a sustainable and biocompatible pathway toward future flexible energy storage systems.