Method of preparing direct methanol fuel sell anode catalyst by sub-stannic acid method
A methanol fuel cell, stannous acid technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as low methanol electro-oxidation current
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Embodiment 1
[0020] Take 6.2mmol SnCl 2 ·2H 2 O was placed in a 50ml l.25M NaOH solution at 20℃ under ultrasonic vibration for 10 minutes. After it was completely dissolved, add 0.8g of carbon black XC-72, and then ultrasonically vibrate for 20 minutes to make the carbon black highly dispersed, and then add it. Ionized water, dilute the suspension to 250ml, then add 25.6ml H at a time while stirring at high speed 2 PtCl 6 The solution was stirred at high speed at 20°C for 5 hours. Pour out the liquid after layering, and then filter. The filter residue was washed with 1.25M NaOH first, and then washed repeatedly with hot deionized water. After filtering and washing, place the filter residue in an oven at 80°C for 24 hours.
[0021] The product of this example is marked as A, and thermogravimetric analysis shows that the Pt yield is above 98%.
[0022] At 1MH 2 SO 4 The cyclic voltammetry experiment in the shows that its electrochemical particle size is 8.61nm. At 1MH 2 SO 4 +1MCH 3 The steady-s...
Embodiment 2
[0024] According to the steps of preparing stannous acid in Example 1, take five parts of 12.29mmolSnCl 2 ·2H 2 O, respectively dissolve in 90ml, 110ml, 130ml, 150ml, 170ml 1.25M NaOH to prepare stannous acid, then add 0.8g XC-72 respectively, and dilute to 280ml after ultrasonic dispersion, and heat to 80℃. Then take five 25.6ml 0.04M H 2 PtCl 6 Solution and dilute to 80ml. Within 1 hour, the prepared H 2 PtCl 6 After the solution is dripped, keep high-speed stirring during the dripping process. After the dripping is completed, keep it under high-speed stirring at 80°C for 1 hour, while supplementing the evaporation of water. Pour out the liquid after layering, and then filter. The filter residue was washed with 1.25M NaOH first, and then washed repeatedly with hot deionized water. After filtering and washing, place the filter residue in an oven at 80°C for 24 hours.
[0025] The products obtained were marked as B, C, D, E, F in the order of increasing NaOH addition. Thermogravim...
Embodiment 3
[0028] Take three 12.29mmolSnCl 2 ·2H 2 O, respectively dissolved in 90ml, 110ml, 130ml 1.25M NaOH. Except that the dripping process lasts for 2 hours, the other implementation processes are the same as in Example 2.
[0029] The products obtained are marked as G, H, I in the order of increasing NaOH addition. Thermogravimetric analysis shows that the yield of Pt in products G and H is above 98%, and the yield of Pt in product I is 67%.
[0030] At 1MH 2 SO 4 The cyclic voltammetry experiments in, show that the electrochemical particle size of products G, H, I are 9.42, 10.53, 9.63nm, respectively, at 1MH 2 SO 4 +1MCH 3 The steady-state polarization curve of OH, such as image 3 , Indicating that the methanol electrooxidation catalytic activity at 0.5V vs. SCE is 180, 154.5, 176mA mg -1 (Pt). The electrochemical test temperature is 25℃, and the total load of Pt in each valence state in each electrode is 1mg cm -2 .
[0031] The product performance of Example 3 of the present inven...
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