Growth of NiMn layered double hydroxide and polypyrrole on bacterial cellulose nanofibers for efficient supercapacitors

Abstract Bacterial cellulose (BC) is an appealing biomass for developing functional electrodes with multiple components along their cross-linked nanofibers. Herein, we demonstrate a BC-directed ternary composite through the successive layer-assembly of polypyrrole (PPy) and bimetallic hydroxide (NiMn-LDH). In our strategy, both in-situ layer-by-layer depositions have been realized at mild conditions (≤25 °C). By tailoring the feeding weights of PPy/BC in NiMn-LDH precursor solutions, the ternary composites the maximum loading of NiMn-LDH has achieved with the highest specific surface. The optimized BC-based electrode material delivers a specific capacity of 653.1 C g −1 at a current density of 1.0 A g −1 . Hybrid supercapacitor by assembling NiMn-LDH/PPy/BC as cathode and Fe 3 O 4 @C/MWCNTs as anode shows stable performance with a high energy density of 29.8 Wh kg −1 at a power density of 299.0 W kg −1 . Our strategy to prepare BC-based electrode materials may provide new opportunities for developing low-cost and efficient energy-storage devices.