Co(OH)2 electrodeposition modified bamboo-based laminated structure woodceramics electrode assembled with CNT and holed graphene

Abstract

To investigate the effect of Co(OH)₂ on the performance of the special capacitor, graphene was holed (HG) using microwave and KMnO₄ and electrostatically sprayed with CNT to prepare a laminated structure bamboo woodceramics matrix (C/HG@BE). Then, Co(OH)₂ was electrodeposited on the matrix to form a supercapacitor electrode (C/HG@BE-Co-x). The results showed that the Mn nanoparticles generated by KMnO₄ under the action of microwave were partially embedded in the graphene sheet mesh and formed holes in the graphene sheet after removal. The matrix had a clear laminated structure and good electrical conductivity. The electrical resistivity was approximately 0.163 Ω cm at 1000 ℃ sintering temperature and remained low after the electrode was modified Co(OH)₂. Meanwhile, the Co(OH)₂ was uniformly deposited on the surface and within pores of the wall of the matrix and anchored by PPy to reduce fall. The electrode of C/HG@BE-Co-₁₅₀₀ modified with Co(OH)₂ exhibited a good pseudocapacitance effect. At the current density of 0.1 A/g, the specific capacitance was approximately 255.12 F/g, and the retention of specific capacitance was maintained at 83.75% after 10000 cycles. When the energy density was 40.78 Wh/kg, the power density was 480 W/kg, indicating excellent electrochemical performance, which contributed of the synergistic action of electronic double layer capacitor and pseudocapacitance.