Electrochemical Preparation of Noble Metal Nanoparticle Catalysts Supported by rgo/Carbon Paper
A nanoparticle and electrochemical technology, which is applied in the field of electrochemical preparation of noble metal nanoparticle catalysts supported by rGO/carbon paper composite carrier, can solve the problems such as dispersibility to be improved, and achieve simple and rapid synthesis method, large specific surface area and simple equipment Effect
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[0044] Preparation of GO
[0045] The present invention can use GO prepared by the Hummer method, but is not limited thereto. In a specific embodiment of the present invention, the implementation steps of preparing GO by the Hummer method are as follows: first, 115 mL of 98% concentrated H 2 SO 4 , 5g natural scaly graphite powder and 2.5gNaNO 3 Magnetically stirred for 4h, the mixed solution was transferred to an ice bath, and 15g KMnO was slowly added while stirring 4 ; Then transfer the above mixed solution to a water bath at 35°C, and magnetically stir for 0.5h; then transfer the mixed solution to 230mL deionized water at 98°C, let it stand for 5min, add warm water to dilute to 550mL, take 35mL H 2 o 2 added to the above solution to remove residual H 2 SO 4 and KMnO 4 ; Finally, wash with 5% HCl solution and deionized water respectively, suction filter, and then centrifuge to obtain GO colloid, and finally freeze-dry the colloid at -40°C to obtain GO.
[0046] ...
Embodiment 1
[0056] The preparation of embodiment 1 Pd / rGO / CFP (10cycles) catalyst
[0057] 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 the rGO / CFP carrier.
[0058] Using a three-electrode system, a 3cm 2 The above-mentioned rGO / CFP carrier was used as the working electrode, the graphite electrode was used as the counter electrode, and Ag / AgCl was used as the reference electrode. 2 PdCl 4 In the solution, the Pd / rGO / CFP (10 cycles) catalyst was obtained by scanning 10 cycles at a scanning speed of 10 mV / s in the potential range of -0.9 V to 0 V by cyclic voltammetry (CV). The SEM image of the catalyst is shown in figure 1 As shown in a, evenly distributed Pd nanoparticles can be clearly observed, with a particle size of about 10nm. Due to the electrodeposition cycle of 10 cycle...
Embodiment 2
[0065] The preparation of embodiment 2 Pd / rGO / CFP (5cycles) catalyst
[0066] 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 the rGO / CFP carrier.
[0067] Using a three-electrode system, a 3cm 2 The above-mentioned rGO / CFP carrier was used as the working electrode, the graphite electrode was used as the counter electrode, and Ag / AgCl was used as the reference electrode. 2 PdCl 4 In the solution, use cyclic voltammetry (CV) in the potential range of -0.9V to 0V, scan 10 cycles at a scanning speed of 10mV / s, and obtain the Pd / rGO / CFP (5cycles) catalyst. The SEM image of the catalyst Such as image 3 As shown, the distribution is relatively uniform, with a small amount of particle accumulation.
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