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