A kind of cobalt-loaded hollow carbon nanofiber composite catalyst and its preparation method and application
A carbon nanofiber, composite catalyst technology, applied in the chemical characteristics of fibers, fiber processing, fuel cell-type half-cells and primary battery-type half-cells, etc., can solve problems such as limiting the performance of lithium-oxygen batteries and achieve cycle stability. Good, small electrode polarization, performance improvement effect
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[0028] The present invention provides a method for preparing a cobalt loaded hollow carbon nanofiber composite catalyst, comprising the steps of:
[0029] The polyacrylonitrile, acetate tetrahydrate, and N, N-dimethylformamide were mixed to give a housing precursor;
[0030] The polymethyl methacrylate was mixed with N, N-dimethylformamide to obtain a nuclear precursor;
[0031] The housing precursor is injected into the outer syringe, and the nuclear precursor is injected into the inner syringe, and the electrospinning is performed to obtain fibers;
[0032] The fibers were heat treated to obtain a hollow carbon nanofiber composite catalyst of the cobalt load.
[0033] The present invention mixes the polyacrylonitrile (PAN), the cobalt tetrahydrate and N, N-dimethylformamide (DMF) to obtain a housing precursor.
[0034] In the present invention, the weight content of the polypropylene nitrile in the precursor is preferably 10 to 12%, acetate tetrahydrate (CH). 3 COO) 2 · 4h 2 O) ...
Embodiment 1
[0051] Preparation of electrospinning precursors:
[0052] Polyacrylonitrile (PAN, MW = 150000), PMMA, N, N-dimethylformamide solution (DMF, 99.8%), cobalt (Cobalt tetrahydrate), from Alfaaesar.
[0053] First, two different polymer solutions are disposed as an interior of the coaxial syringe and an external precursor solution. PAN and PMMA were dissolved in DMF, respectively, the concentrations were 10% by weight and 20 wt%, respectively, and stirred vigorously at 40 ° C for 12 h. Subsequently, 5 wt% of CO (CH 3 COO) 2 · 4h 2 O Uniformly mixed in a DMF solution containing 10 wt% PAN as a housing precursor. At the same time, a DMF solution containing 20 wt% PMMA was used as a nucleus precursor.
[0054] Electrostatic spinning process:
[0055] The resulting two precursors were injected into the inner layer and outer syringes, respectively, and the needles were 26 and 21, respectively, two different types of stainless steel needles, respectively. The electrospinning voltage is 15 k...
Embodiment 2
[0079] Preparation of electrospinning precursors:
[0080] Polyacrylonitrile (PAN, MW = 130000), PMMA, N, N-dimethylformamide solution (DMF, 99.8%), cobalt (cobalt tetrahydrate) from Alfaaesar.
[0081] First, two different polymer solutions are disposed as an interior of the coaxial syringe and an external precursor solution. PAN and PMMA were dissolved in DMF, respectively, the concentrations were 10% by weight and 20 wt%, respectively, and stirred vigorously at 40 ° C for 12 h. Subsequently, 4 wt% of CO (CH 3 COO) 2 · 4h 2O Uniformly mixed in a DMF solution containing 10 wt% PAN as a housing precursor. At the same time, a DMF solution containing 20 wt% PMMA was used as a nucleus precursor.
[0082] Electrostatic spinning process:
[0083] The resulting two precursors were injected into the inner layer and outer syringes, respectively, and the needles were 26 and 21, respectively, two different types of stainless steel needles, respectively. The electrospinning voltage is 20 kV,...
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