Preparation method of platinum-cobalt alloy nano electrocatalyst
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A nano-catalyst, platinum-cobalt alloy technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as slow instability, oxygen reduction capacity limitation, etc.
Inactive Publication Date: 2020-11-10
NANJING UNIV
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Problems solved by technology
However, due to the slow kinetic process of oxygen reduction reaction and the inherent instability of Pt nanoparticles, the oxygen reduction ability of platinum nanoelectrocatalysts is limited during the operation of fuel cells.
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Embodiment 1
[0019] A kind of preparation method of high-performance 52% platinum-cobalt alloy nano electrocatalyst, its steps are as follows:
[0020] Step 1, take by weighing 1.504g chloroplatinic acid aqueous solution (H 2 PtCl 6 ·6H 2 O, the mass fraction is 10%), 21.78mg cobalt chloride (CoCl 2 ·6H 2 0), triethylamine 100ul is added 25mL ethanol to dissolve, and it is placed in supersonic wave ultrasonic 30min to make mixed solution, for subsequent use;
[0021] Step 2. Weigh 57.84 mg of carbon black ECP-600 and add it to absolute ethanol, mix well, and ultrasonicate for 1 hour to obtain carbon black slurry;
[0022] Step 3, adding the mixed solution of Step 1 to the carbon black slurry of Step 2, and ultrasonically uniformly obtaining the precursor solution;
[0023] Step 4: Weigh 100 mg of sodium borohydride and dissolve it in 5 ml of ethanol, pour it into the precursor solution, and continue to stir and react for 1 hour at 1000 rpm; filter, wash, and dry to obtain a high-perfo...
Embodiment 2
[0026] A kind of preparation method of high-performance 52% platinum-cobalt alloy nano electrocatalyst, its steps are as follows: step 1, take by weighing 1.504g chloroplatinic acid aqueous solution (H 2 PtCl 6 ·6H 2 O, the mass fraction is 10%), 21.78mg cobalt chloride (CoCl 2 ·6H 2 0), triethylamine 100ul is added 25mL ethanol to dissolve, and it is placed in supersonic wave ultrasonic 30min to make mixed solution, for subsequent use;
[0027] Step 2. Weigh 57.84 mg of carbon black ECP-600 and add it to absolute ethanol, mix well, and ultrasonicate for 1 hour to obtain carbon black slurry;
[0028] Step 3, adding the mixed solution of Step 1 to the carbon black slurry of Step 2, and ultrasonically uniformly obtaining the precursor solution;
[0029] Step 4: Weigh 100 mg of sodium borohydride and dissolve it in 5 ml of ethanol, pour it into the precursor solution, and continue to stir and react for 1 hour at 1000 rpm; filter, wash, and dry to obtain a high-performance pla...
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Abstract
The invention discloses a preparation method of a platinum-cobalt alloy nano electrocatalyst. The preparation method comprises the following steps: dissolving a chloroplatinic acid aqueous solution and cobalt dichloride in ethanol, and carrying out ultrasonic dispersion for 15-30 minutes; dropwise adding triethylamine, and continuously carrying out ultrasonic dispersion for 15-30 minutes until thesolution is turbid and uniform, so as to obtain a mixed solution; ultrasonically and uniformly dispersing carbon black ECP-600 into absolute ethyl alcohol, and performing ultrasonic dispersing for 1hto obtain carbon black slurry; adding the mixed solution into carbon black slurry, and carrying out ultrasonic dispersion to obtain a precursor solution; adding a sodium borohydride ethanol solutioninto the precursor solution obtained in the step 3 under 1,000rmp, and carrying out a stirring reaction for 1h; and carrying out the filtering, washing and drying to obtain the platinum-cobalt alloy nano-catalyst. The PtCo alloy nano electrocatalyst is synthesized from cheap raw materials; after the Co is added, the electrochemical activity area and the oxygen reduction reaction of the electrocatalyst are obviously improved by proper material addition amounts of the reducing agent and the alkaline complexing agent.
Description
technical field [0001] The invention belongs to the field of industrial fuel cell catalysts, and in particular relates to a preparation method of a platinum-cobalt alloy nanometer electrocatalyst. Background technique [0002] As a battery that can replace fossil fuel equipment, fuel cells have broad application prospects. Among them, proton exchange membrane fuel cells (PEMFCs) are one of the most promising fuel cells to replace internal combustion engines as power transportation devices. It has the characteristics of no pollution, abundant fuel sources, light weight, portability, and high efficiency. To realize the commercialization of various energy devices, it is necessary to prepare advanced, efficient, and durable electrode materials. [0003] Unsupported or carbon-supported platinum nanoparticles are commonly used electrocatalysts for fuel cells. Because platinum has an ideal electrocatalytic surface, which can selectively activate the incorporation of molecular oxy...
Claims
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