Pt-based nanowire cathode catalyst for in-vehicle fuel cell and preparation method thereof
A cathode catalyst and fuel cell technology, which is applied in power system fuel cells, battery electrodes, circuits, etc., can solve the problems of low interconnectivity of catalyst metals, poor continuity of hard templates, and expensive hard templates, and achieve easy mass production , improve the utilization rate, the effect of cheap price
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Embodiment 1
[0042] Power generation performance and durability of Pt nanowire catalysts synthesized by a template-free method
[0043] Weigh 0.075g of Vulcan XC-72R carbon black that has been pretreated (refluxing with 2.0mol / L hydrochloric acid at 120°C for 8 hours and refluxing with 5.0mol / L nitric acid at 120°C for 8 hours) and put it into a 100mL beaker. After adding 30 mL of deionized water, sonicate in an ultrasonic oscillator for 30 min. Take 15 mL of H at a concentration of 10 mg / mL 2 PtCl 6 Add the aqueous solution into the beaker containing the carbon black suspension; then add 30mL of formic acid and continue to sonicate for 30min; then put the above mixed solution in a fume hood for 72h; filter the obtained mixture in a suction filter while using a large amount of Washed with deionized water to be free of Cl - Until it is detected, the filter cake is collected and dried in a vacuum oven at 80° C. for 8 hours; the final catalyst can be obtained.
[0044] The applicant of th...
Embodiment 2
[0047] The power generation performance and durability of the PtCo nanowire catalyst synthesized by the soft template method, and its synthesis schematic diagram is shown in figure 1 shown.
[0048] Into a 250mL three-neck round bottom flask, add 10mL CTAB chloroform solution with a concentration of 40mM and CoCl with a concentration of 20mM 2 and H 2 PtCl 6 Add 5mL of each aqueous solution, keep stirring for 30min, then add 80mL of deionized water, continue stirring at a stirring speed of 1000rpm for 15min, and slowly add 10mL of newly prepared solution containing 0.4g NaBH with a syringe pump 4 aqueous solution into the above mixed solution. The whole reaction process was carried out under the protection of nitrogen. Add NaBH 4 After the solution was reacted for 20 minutes until the solution turned dark gray, the reaction product was transferred to a 500mL beaker and excess ethanol was added, the residual CTAB was removed by high-speed centrifugation, and the solid prod...
Embodiment 3
[0052] Power generation performance and durability of the PtCo nanowire catalyst synthesized by the soft template method described in Example 2.
[0053] Such as Figure 8 It can be seen from the SEM photo that the nanowire structure is uniform and stable, with a diameter of about 10 nm and a length of about 500-700 nm. Due to the characteristics of the nanowire structure, compared with Pt particles, Pt nanowires are less prone to focus growth, dissolution and migration, thus making the durability of the main active component better.
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