Oxygen-deficient bismuth oxide (r-Bi 2 O 3 )/graphene (GN) is designed, fabricated, and demonstrated via a facile solvothermal and subsequent solution reduction method. The ultrafine network bacterial cellulose (BC) as substrate for r-Bi 2 O 3 /GN exhibits high flexibility, remarkable tensile strength (55.1 MPa), and large mass loading of 9.8 mg cm −2 . The flexible r-Bi 2 O 3 /GN/ BC anode delivers appreciable areal capacitance (6675 mF cm −2 at 1 mA cm −2 ) coupled with good rate capability (3750 mF cm −2 at 50 mA cm −2 ). In addition, oxygen vacancies have great influence on the capacitive performance of Bi 2 O 3 , delivering significantly improved capacitive values than the untreated Bi 2 O 3 flexible electrode, and ultrahigh gravimetric capacitance of 1137 F g −1 (based on the mass of r-Bi 2 O 3 ) can be obtained, achieving 83% of the theoretical value (1370 F g −1 ). Flexible asymmetric supercapacitor is fabricated with r-Bi 2 O 3 /GN/BC and Co 3 O 4 /GN/BC paper as the negative and positive electrodes, respectively. The operation voltage is expanded to 1.6 V, revealing a maximum areal energy density of 0.449 mWh cm −2 (7.74 mWh cm −3 ) and an areal power density of 40 mW cm −2 (690 mW cm −3 ). Therefore, this flexible anode with excellent electrochemical performance and high mechanical properties shows great potential in the field of flexible energy storage devices.

A covalently connected rGO–TpPa-1-COF hybrid material synthesized by one-pot reaction for enhanced photocatalytic hydrogen evolution under visible light irradiation.

Ti‐doped FeOOH quantum dots (QD) decorated on graphene (GN) sheets are designed and fabricated by a facile and scalable synthesis route. Importantly, the Ti‐doped FeOOH QD/GN are successfully dispersed within bacterial cellulose (BC) substrate as bending anode with large loading mass for flexible supercapacitor. By virtue of its favorable architecture, this composite electrode exhibits a remarkable areal capacitance of 3322 mF cm−2 at 2 mA cm−2, outstanding cycle performance (94.7% capacitance retention after 6000 cycles), and excellent mechanical strength (68.7 MPa). To push the energy density of flexible supercapacitors, the optimized asymmetric supercapacitor using Mn3O4/GN/BC as positive electrode and Ti‐doped FeOOH QD/GN/BC as negative electrode can be cycled reversibly in the operating voltage range of 0–1.8 V and displays ultrahigh areal energy density of 0.541 mWh cm−2, ultrahigh volumetric energy density of 9.02 mWh cm−3, reasonable cycling performance (9.4% decay in specific capacitance after 5000 cycles), and good capacitive retention at bending state.