Electrochemical in-situ purifying process of carbon base nanometer electrocatalyst material
A technology of carbon-based nanomaterials and electrocatalysts, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve short cycle, simple operation, and good effect
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Embodiment 1
[0025] Weigh 0.1 gram of carbon nanotubes containing 0.43wt% iron metal nanoparticles, add 0.9 gram of water to make the mass percentage of carbon nanofiber A obtained through ultrasonic dispersion be 10%, weigh 0.25 gram of carbon nanotubes containing 60% polytetrafluoroethylene Add 2.25 g of water to the polytetrafluoroethylene emulsion, and dilute it into a polytetrafluoroethylene solution B with a mass percentage of 6%. In a water bath at 80°C, put the mixed liquid A in a beaker, and gradually add the solution B under vigorous stirring. Continue to stir until a gel forms. Afterwards, the obtained jelly was uniformly coated on the nickel foam, and pressed into a tablet at 250° C. under a pressure of 5 MPa to obtain an unpurified carbon nanofiber electrocatalyst.
[0026] The prepared carbon nanofiber electrocatalyst was placed in 2M HNO 3 in solution. The cyclic voltammetry scan was carried out in the range of 1.0V to -1.0V, the scan speed was 0.1V / s, and the number of s...
Embodiment 2
[0028] Take by weighing 0.1 gram of nano-carbon fiber containing 1% nickel and iron metal nanoparticles, add 0.4 gram of water, make the mass percentage of nano-carbon fiber A obtained through ultrasonic dispersion be 20%, weigh 0.25 gram of 60wt% polytetrafluoroethylene Add 2.25 g of water to the polytetrafluoroethylene solution, and dilute it into 6 wt% polytetrafluoroethylene solution B. In a water bath at 80°C, put A in a beaker, and gradually add solution B under vigorous stirring. Continue to stir until a gel forms. Afterwards, the obtained jelly was evenly coated on the nickel foam, and pressed into a tablet at 250° C. under a pressure of 5 MPa to obtain an unpurified carbon nanofiber electrocatalyst.
[0029] Put the prepared carbon nanofiber electrocatalyst into the carefully deaerated 3M HNO 3 in solution. The cyclic voltammetry scan was carried out in the range of 1.0V to -1.0V, the scan speed was 0.1V / s, and the number of scans was 100 times. After that, the el...
Embodiment 3
[0031] Weigh 5 mg of carbon nanofibers containing 7 wt % iron metal nanoparticles and directly add 1 ml of 0.5 wt % Nafion solution. After ultrasonic dispersion, 10 μL of the mixed liquid was dropped on a glassy carbon electrode with a diameter of 3 mm using a pipette gun, and then dried naturally in an air atmosphere for 1 h. Obtain the required nano-carbon fiber electrocatalyst.
[0032] Put the prepared carbon nanofiber electrocatalyst into 2M H 2 SO 4 in solution. The cyclic voltammetry scan was carried out in the range of 1.0V to -1.0V, the scan speed was 0.1V / s, and the number of scans was 100 times. After that, the electrocatalyst was washed with ultrapure water, and the metal content of carbon nanofibers after in situ purification and activation was determined by EDS. EDS analysis showed that the carbon nanofibers activated in situ could not detect the presence of iron.
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