Fabrication and electrochemical properties of Mn, N, and S co-doped carbon fiber composite bamboo-based woodceramics electrodes

Abstract

Prepared in this study, Mn, N and S co-doped woodceramics electrodes (WC@Mn-N/S) were prepared using waste bamboo as the base material, carbon fiber as the reinforcement fiber, KMnO4 and CH4N2S as dopants and activators. Mechanical analysis revealed a 68 % increase in the flexural strength of the matrix material reinforced with carbon fibers. Scanning electron microscopy observation indicated that WC@Mn-N/S retained the original natural pore structure of bamboo. The specific surface area (BET) analysis revealed that WC@Mn-N/S exhibited a specific surface area of 861.7 m2/g, with its pore size structure mainly distributed in the range of 1.3–3.8 nm. Electrochemical performance tests showed that the introduction of Mn, N and S elements endowed the bamboo-based electrode with pseudocapacitance characteristics. Additionally, the synergistic effect between these three elements imparted pseudocapacitance to the electrode material. WC@Mn-N/S performent a specific capacitance of 615 F/g, at 0.2 A/g with excellent capacitance retention (99.4 % after 5000 cycles). In the practical assembled in symmetrical capacitor the material showed high power density 500 W/kg and energy density 57.9 Wh/kg, indicating its excellent electrochemical performance.