▎ 摘　　要

Flexible energy storage devices require a simple, scalable and general strategy for fabricating high electrochemical performance and mechanically tough flexible electrodes. Herein, sustainable and biological bacterial cellulose (BC) is developed as substrate for Co3O4/graphene (GN), which permits high flexibility (suitable for bending angle of 180 degrees), excellent tensile strength of 63 MPa, good wettability, and especially large mass loading of 9.61 mg cm(-2) for a flexible and free-standing supercapacitor electrode. The Co3O4/GN/BC hybrid electrode exhibits both appreciable areal capacitance of 12.25 F cm(-2) and gravimetric capacitance of 1274.2 F g(-1) Moreover, the remarkable cycling stability with 96.4% capacitance retention after 20000 can be achieved. This study provides a facile procedure to improve the electrochemical performance and mechanical property of flexible supercapacitor electrodes, which are promising candidates for the application of a flexible power source.