Highly dispersed and loaded core-shell structure pd@ni/wc catalyst for direct alcohol fuel cell and preparation method thereof
A core-shell structure, fuel cell technology, applied in fuel cells, structural parts, battery electrodes, etc., can solve the problems of anode catalyst restricting the industrialization process of direct alcohol fuel cells, limited cost reduction, poor stability, etc. Conducive to large-scale production, reducing usage and cost, and not easy to agglomerate
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Embodiment 1
[0041] Example 1: Pd 2 @Ni 1 / WC 1.31 -900℃-3h(Pd 2 @Ni refers to the molar ratio of Pd and Ni is 2:1, WC 1.31 Indicates tungsten carbide, the mass ratio of tungsten source and carbon source is 1:1.31, the calcination temperature is 900°C, and the calcination time is 3h)
[0042] Weigh 1g of ammonium metatungstate, dissolve 1.31g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 2g of SiO 2 The sol (diameter 20nm, mass fraction 40%) was stirred at 80°C for 3h; dried at 120°C for 5h to obtain a precursor solid. The above precursor solids were placed in a tube furnace, N 2 Under atmosphere at 5°C min -1 The rate is programmed to 550°C, then at 2°C min -1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 80°C for 12h, suction filter, wash, and vacuum dry at 80°C fo...
Embodiment 2
[0045] Example 2: Pd 3 @Ni 1 / WC 1.31 -900℃-3h(Pd 3 @Ni means the molar ratio of Pd and Ni is 3:1, WC 1.31 Indicates tungsten carbide, the mass ratio of tungsten source and carbon source is 1:1.31, the calcination temperature is 900°C, and the calcination time is 3h)
[0046] Weigh 1g of ammonium metatungstate, dissolve 1.31g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 2g of SiO 2 The sol (diameter 20nm, mass fraction 40%) was stirred at 80°C for 3h; dried at 120°C for 5h to obtain a precursor solid. The above precursor solids were placed in a tube furnace, N 2 Under atmosphere at 5°C min -1 The rate is programmed to 550°C, then at 2°C min -1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 80°C for 12h, suction filter, wash, and vacuum dry at 80°C for 6h...
Embodiment 3
[0049] Example 3: Pd 4 @Ni 1 / WC 1.31 -900℃-3h(Pd 4 @Ni means the molar ratio of Pd and Ni is 4:1, WC 1.31 Indicates tungsten carbide, the mass ratio of tungsten source and carbon source is 1:1.31, the calcination temperature is 900°C, and the calcination time is 3h)
[0050] Weigh 1g of ammonium metatungstate, dissolve 1.31g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 2g of SiO 2 The sol (diameter 20nm, mass fraction 40%) was stirred at 80°C for 3h; dried at 120°C for 5h to obtain a precursor solid. The above precursor solids were placed in a tube furnace, N 2 Under atmosphere at 5°C min -1 The rate is programmed to 550°C, then at 2°C min -1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 80°C for 12h, suction filter, wash, and vacuum dry at 80°C for 6h...
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