Preparation method of transition metal oxide modified rgo supported noble metal nanocatalyst
A transition metal and oxide technology, applied in the field of electrochemical preparation of noble metal nanocatalysts, can solve the problems of low methanol conversion efficiency and slow development, and achieve the effects of simple and fast synthesis method, simple equipment and short experimental period
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[0048] figure 1 Is the flow chart of the preparation method embodiment of the present invention. Such as figure 1 As shown, the preparation method embodiment of the present invention includes the step of removing impurities from the carbon paper. It should be noted that, in the present invention, the term "carbon paper" is used as a general term for carbon fiber paper (CFP), carbon cloth, and carbon felt.
[0049] In the embodiment of the present invention, the carbon paper can be soaked in aqua regia for a predetermined time to remove impurities on the carbon paper and obtain pure carbon paper. For example, the original CFP is cut into small pieces, soaked in aqua regia for about 12-24 hours, washed with ultrapure water, and vacuum-dried to obtain pure CFP.
[0050] The preparation method embodiment of the present invention includes the step of preparing GO / carbon paper carrier. Specifically, the GO suspension is evenly coated and dropped on the carbon paper, and the GO / c...
Embodiment 1
[0059] Example 1 Pd / Co 3 o 4 - Preparation of rGO / CFP (4mM, 5cycles) catalyst
[0060] Evenly drop 3ml of GO ethanol suspension with a concentration of 2mg / mL on an area of 12cm 2 On the pure CFP, the GO / CFP carrier was obtained after vacuum drying; the GO / CFP carrier was mixed with argon and hydrogen (7%H 2 ) at 800°C for 1 h to obtain rGO / CFP carrier.
[0061] Weigh 70mg of cobalt acetate and dissolve it in a mixed solvent of 70mL of isopropanol and water (mixture of isopropanol and water volume 1:1) to form a cobalt acetate solution with a concentration of 4mmol / L, transfer it to a 100mL reaction kettle after stirring for 20min, and Put the above rGO / CFP carrier and react at 120°C for 15h, cool to room temperature, wash and dry in vacuum to obtain Co 3 o 4 - rGO / CFP vector. Such as figure 2 As shown in c, the Co prepared by this method 3 o 4 For the cubic structure, the average particle size is about 70nm.
Embodiment 2
[0070] Example 2 Pd / Co 3 o 4 - Preparation of rGO / CFP (4mM, 1cycle) catalyst
[0071] Evenly drop 3ml of GO ethanol suspension with a concentration of 2mg / mL on an area of 12cm 2 On the pure CFP, the GO / CFP carrier was obtained after vacuum drying; the GO / CFP carrier was mixed with argon and hydrogen (7%H 2 ) at 800°C for 1 h to obtain rGO / CFP carrier.
[0072] Weigh 70 mg of cobalt acetate and dissolve it in 70 mL of isopropanol and water mixed solvent (1:1 mixture of isopropanol and water volume) to form a cobalt acetate solution with a concentration of 4 mmol / L, stir for 20 min, transfer to a 100 mL reaction kettle, and put Add the above rGO / CFP carrier and react at 120 °C for 15 h, cool to room temperature, wash, and dry in vacuum to obtain Co 3 o 4 -rGO / CFP carrier, where Co 3 o 4 For the cubic structure, the average particle size is about 70nm.
[0073] Using a three-electrode system, a 3cm 2 Co 3 o 4 -rGO / CFP carrier as working electrode, graphite electrode...
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