One type of zinc-air battery is prepared and applied to the air battery nano-fiber electrode catalyst
A nanofiber, air battery technology, applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, nanotechnology for materials and surface science, etc. Can not meet the problems of zinc-air battery, slow oxygen reaction speed, etc., to achieve good long-term stability, good catalytic effect, and low cost of raw materials
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[0032] The present invention also provides a preparation method of perovskite nanofiber for rechargeable zinc-air battery, and the specific preparation steps are as follows:
[0033] 1) adding lanthanum nitrate hexahydrate, strontium acetate, cobalt nitrate, and ammonium metatungstate into an organic solvent, and stirring to obtain a precursor;
[0034] 2) transferring the precursor solution obtained in step 1) into a spinning tube, and performing electrospinning to obtain nanofibers;
[0035] 3) calcining the nanofibers obtained in step 2) in a tubular furnace, heating up, maintaining the temperature, and then lowering to room temperature to obtain La. 0.5 Sr 0.5 Co 1-x W x O 3-δ Perovskite nanofibers.
[0036] In the present invention, the organic solvent is a DMF solution containing PVP (K90), and the mass fraction of PVP (K90) is 10-15%, preferably 11-13%, more preferably 12%.
[0037] In the present invention, the molar ratio of the mass of the organic solvent added...
Embodiment 1
[0045]Weigh 2.25mol of lanthanum nitrate hexahydrate, 2.25mol of strontium acetate, 3.15mol of cobalt nitrate, and 1.35mol of ammonium metatungstate, and add them to 30g of PVP(K90) / DMF organic solvent (the mass fraction of PVPK90 is 12%) at room temperature. Stir for 24h to obtain the precursor.
[0046] Transfer the precursor solution into a spinning tube, and perform electrospinning at a voltage of 16 kV (electrospinning distance is 13 cm) to obtain nanofibers;
[0047] The nanofibers were calcined in a tubular furnace under an argon atmosphere at 400 °C for 2 h, then heated from 400 °C to 700 °C at a heating rate of 5 °C / min, kept in air for 1 h, and then lowered to room temperature to obtain La 0.5 Sr 0.5 Co 0.7 W 0.3 O 3 Perovskite nanofibers, denoted LSCW 0.3 . The TEM image of the perovskite nanofibers prepared in this example is shown in figure 1 ,from figure 1 It can be seen that the perovskite nanofibers prepared in this example have surface porous propertie...
Embodiment 2
[0049] Weigh 2.25mol of lanthanum nitrate hexahydrate, 2.25mol of strontium acetate, 4.05mol of cobalt nitrate, and 0.45mol of ammonium metatungstate, and add them to 33g of PVP(K90) / DMF organic solvent (the mass fraction of PVPK90 is 10%) at room temperature. Stir for 24h to obtain the precursor.
[0050] Transfer the precursor solution into a spinning tube, and perform electrospinning at a voltage of 18kV (electrospinning distance is 15cm) to obtain nanofibers;
[0051] The nanofibers were calcined in a tubular furnace at 380 °C under an argon atmosphere for 2.5 h, then heated from 380 °C to 680 °C, kept in air for 1.2 h, and then lowered to room temperature to obtain La 0.5 Sr 0.5 Co 0.9 W 0.1 O 3 Perovskite nanofibers, denoted LSCW 0.1 .
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