A biomass-derived nano-carbon composite nickel oxide electrode and application thereof
A compound oxidation and nanocomposite technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve problems such as low conductivity, hindering commercial applications, low cycle stability, etc., and achieve high specific capacitance, good high current charge and discharge The effect of stability and high discharge capacity
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Embodiment 1
[0035] Dissolve 0.5g of sodium lignosulfonate in 20ml of deionized water, and ultrasonically dissolve. Take 500ml of isopropanol and place it in a 500w ultrasonic water bath, use a 30ml syringe to inject the sodium lignosulfonate aqueous solution into the isopropanol at a speed of 20ml / h by means of an automatic sampler. To obtain a suspension of lignin microspheres, continue ultrasonication at 500w for 1h. The reactant was centrifuged at 6000 rpm for 5 min, and dried in a vacuum oven at 60° C. for 24 h to obtain lignin aggregate powder. The dried lignin aggregate powder was calcined in a tube furnace in N2 atmosphere to obtain hierarchical mesoporous carbon nanomaterial HPGC.
[0036] Dissolve HPGC in 1M NaOH solution (5wt%), and add nickel nitrate (5wt%), fully dissolve and then magnetically stir for 6 hours to fully react, centrifuge (6000rpm, 5min), and dry in a vacuum oven at 60°C for 24h to obtain Coated with Ni(OH) 2 hierarchical mesoporous nanomaterials. put the pr...
Embodiment 2
[0041] Basically the same as Example 1, the difference is that the consumption of HPGC and nickel nitrate is changed to 1wt%. The prepared NiO / HMPC NSs electrode material has an initial discharge specific capacity of 978mAh g -1 (0.1A·g -1 ).
Embodiment 3
[0043] Basically the same as Example 1, the difference is that isopropanol is changed into ethanol. The prepared NiO / HMPC NSs electrode material has an initial discharge specific capacity of 922mAh g -1 (0.1A·g -1 ).
[0044] figure 1 The cycle comparisons of pure NiO, HMPC and NiO / HMPC NSs under low current charge-discharge conditions are shown, and the results show that the multilayer porous NiO / HPMC NSs can withstand a current density of 0.1 A g after 100 cycles. -1 Under the condition of 863mAh·g -1, while the stability of the two pure materials is much worse. Although the initial discharge capacity of the NiO electrode is basically the same as that of the composite, its rapid decay indicates poor electrochemical performance. HMPC NSs have typical carbon material properties (good cycle stability) but low discharge capacity. All in all, NiO / HMPC NSs have high electrical conductivity, high porosity, and large specific surface area, which provide more reaction interface...
PUM
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