A core-shell type octasulfide nine cobalt nanoparticles composite nitrogen and sulfur co-doped carbon nanofiber composite material and its preparation method and application
A technology of carbon nanofibers, eight sulfides and nine sulfides, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of low electrocatalytic activity, achieve enhanced catalytic activity, improved conductivity, The effect of excellent electrocatalytic activity
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[0032] The invention provides a method for preparing a core-shell type cobalt octasulfide nine-cobalt nanoparticle composite nitrogen-sulfur co-doped carbon nanofiber composite material, comprising the following steps:
[0033] Mixing polyacrylonitrile, cobalt acetate, sulfur powder and N,N-dimethylformamide to obtain an electrospinning precursor;
[0034] Electrospinning the electrospinning precursor to obtain fibers;
[0035] The fiber is heat-treated to obtain the core-shell type cobalt octasulfide nine-cobalt nanoparticle composite nitrogen-sulfur co-doped carbon nanofiber composite material.
[0036] The invention mixes polyacrylonitrile, cobalt acetate, sulfur powder and N,N-dimethylformamide to obtain an electrospinning precursor.
[0037] In the present invention, the dosage ratio of the polyacrylonitrile, cobalt acetate, sulfur powder and N,N-dimethylformamide is preferably 0.4-0.6g: 2-3mmol: 1-1.5mg: 4-8g, more preferably Preferably it is 0.5g: 2-3mmol: 1.5mg: 5g. ...
Embodiment 1
[0054] Step 1: Sample Preparation
[0055] Preparation of electrospinning precursors:
[0056] Dissolve 2 mmol of cobalt acetate and 1.5 mg of sulfur powder in 5 g of N,N-dimethylformamide solution, add 0.5 g of polyacrylonitrile (Mw=130,000 to 150,000) after the dissolution is complete, and stir magnetically at 50°C for 8 hours to obtain Electrospinning precursors.
[0057] Electrospinning process:
[0058] The prepared electrospinning precursor was sucked into a 10 mL medical syringe, and a needle with a diameter of 1.6 mm was used for spinning jet. The electrospinning voltage was 18KV, the distance between the needle and the receiving plate was 15cm, and the advancing speed was 10μL / min.
[0059] Heat treatment process:
[0060] The fibers were carbonized in a high-purity nitrogen atmosphere from room temperature to 800°C at a heating rate of 3°C / min and held for 2 hours, and finally flexible self-supporting core-shell type cobalt octasulfide nine-cobalt nanoparticles c...
Embodiment 2
[0084] co 9 S 8 The preparation process of @NS-HPCNFs is the same as in Example 1
[0085] battery system
[0086] Battery Assembly:
[0087] Carbon fiber paper GDS2240 with a microporous layer produced by Ballard Power Systems was selected as the current collector of the oxygen electrode and the matrix for controlling the synthesis reaction. Oxygen electrodes for Al / air batteries were obtained by loading oxygen electrocatalysts on carbon fiber paper (this paper does not distinguish between oxygen electrodes and air cathodes). The aluminum / air battery electrolyte is 6MKOH. In an aluminum / air battery, the contact area of the aluminum anode and air cathode with the electrolyte is 1cm 2 . The preparation method of the air cathode catalyst layer is as follows: the Co 9 S 8 @NS-HPCNFs, conductive carbon black (CB) and 5 wt% PTFE emulsion were mixed in a certain volume of absolute ethanol at a mass ratio of 2:2:1, and then ground in a mortar to form a homogeneous slurry. ...
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