Preparation method of PtCo@NC catalyst for direct methanol fuel cell
A methanol fuel cell and catalyst technology, which is applied in fuel cells, nanotechnology for materials and surface science, battery electrodes, etc., can solve the problems of easy agglomeration of Pt nanoparticles, waste of raw materials of Pt nanoparticles, and increased production costs, etc. To achieve the effect of simple modification method, improved utilization and adhesion, and good application prospects
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Embodiment 1
[0031] (1) Preparation of ZIF-67
[0032] Dissolve cobalt nitrate in methanol to obtain a 0.1mol / L cobalt salt solution, dissolve 2-methylimidazole in methanol to obtain a 0.5mol / L 2-methylimidazole solution, mix the cobalt salt solution and 2-methylimidazole solution, The molar ratio of cobalt salt to 2-methylimidazole in the obtained mixed solution was 1:4, and after magnetic stirring for 30 minutes, it was left to incubate at 35°C for 20 hours, and the obtained product was centrifuged, washed with deionized water and ethanol several times, and dried. Get ZIF-67;
[0033] (2) Preparation of polydopamine-coated ZIF-67
[0034] Dissolve dopamine in Tris-HCl buffer solution of 10mM, pH=8.5, so that the concentration of dopamine is 1mg / ml, add the ZIF-67 prepared in step (1), and react at 40°C for 5h under reflux. After the reaction, centrifuge, Washing with absolute ethanol to obtain polydopamine-coated ZIF-67;
[0035] (3) Preparation of Pt@polydopamine-coated ZIF-67
[00...
Embodiment 2
[0040] (1) ZIF-67 was prepared as in step (1) of Example 1;
[0041] (2) Prepare polydopamine-coated ZIF-67 as in step (2) of Example 1;
[0042] (3) Preparation of Pt@polydopamine-coated ZIF-67
[0043] Immerse the polydopamine-coated ZIF-67 prepared in step (2) in a PtCl4 solution with a concentration of 0.02mol / L, and react for 3h under stirring conditions, so that the metal Pt is fully complexed on the surface of polydopamine through a coordination bond ;
[0044] (4) Preparation of PtCo@NC catalyst
[0045] The Pt@polydopamine-coated ZIF-67 obtained in step (3) was placed in a tube furnace, and under the protection of nitrogen, it was roasted at 800°C for 6h to obtain the PtCo@NC catalyst of this example; based on the total weight of the catalyst, The Pt accounts for 12.1wt% of the catalyst weight, and the Co accounts for 3.1wt% of the catalyst weight
Embodiment 3
[0047] Methanol catalytic oxidation experiments using a three-electrode system. The catalyst prepared by the invention is used as a working electrode, a graphite rod is used as a counter electrode, and a saturated calomel electrode is used as a reference electrode. The specific experimental steps are as follows: configure an electrolyte solution containing 0.5M sulfuric acid and 1M methanol aqueous solution, and feed N 2 to remove O from the electrolyte 2 . Then, in the voltage range -0.02-1V, the cyclic voltammetry scan was performed at a scan rate of 50mV / s, and the cyclic voltammetry curve was as follows figure 2 shown. Depend on figure 2 It can be seen that the current density of the PtCo@NC catalyst prepared in the present invention is much higher than that of the commercial Pt / C catalyst, which has a good application prospect.
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