Lanthanum-supported Porous Carbon Composite Electrode Material Prepared by Rice Husk Char
In this paper,a high value-added utilization method of rice husk char was proposed to prepare lanthanum-supported porous carbon composite electrode materials(La/PCs).A series of La/PCs were prepared via in situ activation/loading method.The effects of calcination temperature and impregnation ratio on the adsorption and electro-chemical properties of La/PCs were investigated.X-Ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscope-energy dispersive spectrometer(SEM-EDS)and Brunauer-Emmett-Teller surface area(BET)were used to study the metal structure,valence state,element compositions and surface morphology of those La/PCs.It was analyzed that the possible relationship between pore structure and capacitance value.As a result,the La/PC_900/10 exhibited high gravimetric capacitance of 269.45 F/g in 6 mol/L KOH electrolyte.At 0.5 A/g,the assembled symmetric supercapacitor presented a superior gravimetric energy density of 23.45 W·h/kg at 0.70 kW/kg and the capacitance retention rate was 86.41%after 5000 cycles.The favorable capacitive behavior of La/PC_900/10 demonstrated its potential as carbon-based electrode applied in high performance supercapacitors.This paper provides a feasible path for the utilization of rice husk char and the application of lanthanum in the field of new energy materials.
万方数据
维普
