Sandwich-like self-supported woodceramics electrodes modified with in-situ growth carbon nanotubes catalyzed by Co2+

Abstract

A sandwich-like woodceramics matrix was prepared using bamboo veneer as an external cladding layer, bamboo powder and fiber as a core layer, and thermosetting phenolic resin as the adhesive. The matrix was then modified and regulated by in-situ carbon nanotubes (CNTs) using coal-pitch as a pyrolysis gas source and (CH₃COO)₂Co as a catalyst to obtain self-supported electrodes. The process parameters were optimized by uniform experiments. The results showed that many CNTs were generated when the in-situ growth temperature, time and catalyst dosage were 950 ℃, 1 h and 6%, respectively. There are a lot of mesoporous pores in the electrodes, and the specific surface area is 436.3 m2/g. Meanwhile, it has good electrochemical performance, the specific capacitance reaches 363.02 F/g at a current density of 0.1 A/g, which is 142% higher than that without CNTs modification. After 5000 cycles, the 99.76% of the specific capacitance is retained. In addition, its power density reaches 100.53 W/kg as the energy density is 37.88 Wh/kg, indicating the modification of CNTs can improve the structure and electrochemical performance of bamboo sandwich-like woodceramics electrodes.