Electrocatalyst, preparation method and application
An electrocatalyst and catalyst technology, applied in circuits, electrical components, battery electrodes, etc., to achieve good anti-toxicity, reduce the amount of precious metals, and good stability
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Embodiment 1
[0036] Preparation of CuNi / NC, PtCuNi / NC, PtCuNi / NC-450 catalysts:
[0037] The preparation method of CuNi / NC: Take a nitrogen-containing precursor (such as melamine) and a certain amount of carbon-based materials, add 10-200mL of ethanol, stir at room temperature for 5 hours, then heat in a water bath at 80°C to evaporate the ethanol, dry it in a vacuum at 60°C overnight, and grind . The obtained material was heated in a muffle furnace at 5°C min -1 The heating rate is raised from room temperature to 600°C-1000°C for 1 to 3 hours to obtain a nitrogen-doped carbon-based material, and then take 0.11g NiCl 2 ·6H 2 O, 0.06g CuCl 2 ·6H 2 O and 100mL of ultrapure water were put into the Erlenmeyer flask, ultrasonicated for 5-30min and then stirred for 1-4h, then the nitrogen-doped carbon-based material was added to obtain a mixed solution and stirred for 1-4h, and the whole process was stirred in an ice bath; the mixed solution obtained was added , take a certain amount of red...
Embodiment 3
[0062] CuNi / NC-450, PtCuNi / NC, PtCuNi / NC-450 catalyst stability test.
[0063] The reaction conditions are: prepare 1mol / L KOH+1.0mol / L CH 3 OH solution, and transfer it to the respective three-electrode system (100mL), using a glassy carbon electrode (0.196cm 2 ) as working electrode, platinum foil (counter electrode) and saturated calomel electrode (SCE) as reference electrode. Take 8-15 μL of catalyst ink (2mg / mL) and drop it on the surface of the working electrode. After drying, 6-12 μL of 0.25% Nafion was added to the surface of the electrode catalyst, and the alkaline methanol oxidation test was carried out at room temperature for 4000 s by chronoamperometry in an electrochemical workstation (CHI 760E).
[0064] Other catalysts PtCuNi / NC-350, PtCuNi / NC-550, PtCu / NC-450, PtNi / NC-450, PtCuNi / C-450, PtCuNi / C, Pt / C were tested for 4000s stability in alkaline methanol electrocatalytic oxidation , the test method is as described above, and all parameters are consistent, whi...
Embodiment 4
[0067] The multi-metal catalyst prepared in Example 1 was used to carry out the electrocatalytic oxidation alkaline hydrogen evolution reaction test.
[0068] CuNi / NC-450 catalyst was used as a catalyst: a 1mol / L KOH solution was prepared and transferred to a three-electrode system using carbon paper (1*1cm 2 ) as the working electrode, a graphite rod (counter electrode) and a saturated calomel electrode (SCE) as the reference electrode. Take 50-1000μL CuNi / NC-450 catalyst ink (2mg / mL) and drop it on the surface of the working electrode. After drying, 2-20 μL of 5% Nafion was added to the surface of the electrode catalyst, and the hydrogen evolution reaction test was carried out at room temperature using an electrochemical workstation (CHI 760E);
[0069] PtCuNi / NC as a catalyst: prepare 1mol / L KOH solution and transfer it to a three-electrode system, using carbon paper (1*1cm 2 ) as the working electrode, a graphite rod (counter electrode) and a saturated calomel electrode ...
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