A kind of tricobalt tetroxide@reticular biomass carbon composite material and its preparation method and application
A technology of tricobalt tetroxide and biomass carbon, which is applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, etc., can solve the problems that tricobalt tetroxide does not reach the theoretical value and does not improve the specific capacitance of capacitor electrode materials
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[0043] In the present invention, the preparation method of the reticulated biomass carbon preferably comprises the following steps:
[0044] Alkaline etching is carried out by mixing biomass raw materials and strong alkali solution to obtain alkaline etching biomass;
[0045] In the protective gas, the alkali-etched biomass is carbonized to obtain reticulated biomass carbon.
[0046] In the present invention, the biomass raw material is preferably kelp; the present invention preferably performs pretreatment on the biomass raw material, and in the present invention, the pretreatment preferably includes: washing, drying and crushing the biomass raw material in sequence , in the present invention, the washing is preferably water washing, the present invention has no special requirements for the specific implementation process of the drying, in the present invention, the crushing is preferably shredding; in the present invention, the biomass raw material The particle size is pref...
Embodiment 1
[0084] The kelp was washed and dried, and then cut into pieces, and 50 g of crushed kelp was weighed and soaked in 70 mL of 20wt% KOH solution for alkaline etching for 7 days. Carbonized in a nitrogen-passing quartz tube furnace for 2 hours, and the carbonized product was washed with water to neutrality to obtain a reticulated biomass carbon material;
[0085] 0.5 g of cobalt neodecanoate and 0.5 g of reticulated biomass carbon material were added to 40 mL of tert-heptane, and stirred for 1 hour to form a uniform mixed dispersion; the mixed dispersion was transferred to a reaction kettle for solvothermal reaction at 140 °C, After reacting for 5 hours, the reaction filter residue was cooled and collected. The filter residue was washed with water, dried under vacuum at 60°C, placed in a muffle furnace, and heated to 400°C for 3 hours at a heating rate of 5°C / min to obtain cobalt tetroxide@net. Biomass carbon composites;
[0086] figure 1 Scanning electron microscope characteri...
Embodiment 2
[0102] Wash the kelp, dry it and cut it into pieces. Weigh 50 g of crushed kelp, soak it in 70 mL of a 30wt% KOH solution, and immerse it in 70 mL of 30 wt% KOH solution. After 10 days of alkali etching, take out. Carbonized in a nitrogen-passing quartz tube furnace for 2 hours, and the carbonized product was washed to neutrality, that is, a net biomass carbon material was obtained;
[0103] 1.0 g of cobalt neodecanoate and 0.5 g of reticulated biomass carbon material were added to 40 mL of tert-heptane, and stirred for 1 hour to form a uniform mixed dispersion; the mixed dispersion was transferred to a reaction kettle for solvothermal reaction at 120°C, After reacting for 8 hours, the reaction filter residue was cooled and collected. The filter residue was washed with water, dried in vacuum at 60°C, placed in a muffle furnace, and heated to 450°C for 3 hours at a heating rate of 10°C / min to obtain cobalt tetroxide@net. Biomass carbon composites.
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Abstract
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