Abstract: Using pulping black liquor lignin as carbon precursor and diatomaceous earth as template, high temperature sintering and hydrothermal activation are used to prepare ordered diatomaceous earth template carbon. Diffraction of X-ray (XRD), Raman spectra (RS), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) are employed to analyze and cha-racterize the basic properties, and the electrochemical performance was studied through constant current charging and discharging, cyclic voltammetry, AC impedance and cyclic life, etc. The results show that the prepared template carbon grows in the pore of diatomite and presents a hollow tubular structure. When the mass ratio of lignin/diatomite is 1∶1, after sintering at 900 ℃ for 2 h, and then hydrothermally acticated at 180 ℃ for 10 h, the template carbon electrode materials has better electrochemical performance. As the current density is 0.5 A/g, the mass specific capacitance of the material can reach 207.65 F/g; after 5 000 cycles of charging and discharging at the current density of 2 A/g, the specific capacitance retention rate still reaches 95.4%, indicating that the prepared lignin-based template carbon material has good electrochemical performance.
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2021, Vol. 35 
