Preparation method and application of precious metal electrocatalyst
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An electrocatalyst and precious metal technology, applied in the field of precious metal electrocatalyst preparation, can solve the problems of easy growth and aggregation of platinum particles, increase production cost, complex synthesis steps, etc., and achieve a wide range of carrier selection, high oxygen reduction activity, and simple operation. Effect
Active Publication Date: 2016-02-24
DALIAN UNIV OF TECH
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[0003] Wang Yu and others disclosed a fuel cell electrocatalyst and a preparation method thereof. In this method, the metal catalyst is loaded onto the nano-carbon microspheres by an impregnation method, and the metal salt solution and the carbon nano-microspheres are mixed and stirred evenly, and then added The reducing agent formaldehyde, adjust the pH to 8-9 after the reaction is completed, separate and dry after stirring for 20-120 minutes, and then perform heat treatment to obtain the electrocatalyst. The disadvantage of this method is that formaldehyde needs to be used as the reducing agent, which is highly toxic. The easy growth and aggregation of platinum particles affects its oxygen reduction activity (Wang Ting, Li Ting, Yin Cong, Wang Ronggui, Tang Hao, China Dongfang Electric Group Co., Ltd., publication number: 102810677A)
The method uses a hydrothermal method to synthesize CeO in the synthesis process. 2 /GN, the preparation of composite materials by hydrothermal method requires high pressure, high energy consumption, and the synthesis steps are rel
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Embodiment 1
[0028] Add carbon nanotubes (23.5mg) and ammonia water (7.659mL, 100mM) to deionized water (39mL), add chloroplatinic acid (5.73mL, 20mM) solution, add chloropalladium acid (1.91mL, 20mM) solution, Add chloroauric acid (0.0191mL, 20mM) solution, sonicate for 30min, condense and reflux at 75°C for 2h, let it stand for precipitation, remove the supernatant, and then add NaBH 4 (7.659mL, 150mM) solution, stirred for 0.5h, the resulting precipitate was washed with deionized water until neutral, and dried under vacuum at 65°C. Heat treatment at 200°C for 2h under argon atmosphere.
Embodiment 2
[0030] Add carbon nanotubes (25mg) and ammonia water (7.659mL, 100mM) into deionized water (31mL), add chloroplatinic acid (19.225mL, 20mM) solution, sonicate for 30min, reflux at 75°C for 1h, let stand to precipitate, Remove supernatant, then add KBH 4 (19.225 mL, 150 mM) solution, stirred for 1 h, washed the obtained precipitate with deionized water until neutral, and dried in vacuum at 65 °C. Heat treatment at 200°C for 2h under argon atmosphere.
Embodiment 3
[0032] Graphene (23.5mg) and ammonia water (7.659mL, 100mM) were added in deionized water (39mL), chloroplatinic acid (5.73mL, 20mM) solution was added, chlororhodium acid (1.91mL, 20mM) solution was added, ultrasonic 30min, reflux at 75°C for 2h, set aside for precipitation, remove the supernatant, then add NaBH 4 (7.659mL, 150mM) solution, stirred for 1h, the resulting precipitate was washed with deionized water until neutral, and dried under vacuum at 65°C. Heat treatment at 200°C for 2h under argon atmosphere.
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Abstract
The invention belongs to the field of precious metal electrocatalysts, and relates to a preparation method and application of a precious metal electrocatalyst. The preparation method comprises the steps: mixing a carbon carrier, an alkaline substance and a precious metal salt aqueous solution evenly, to prepare a suspension; at the temperature of 50-200 DEG C, carrying out reflux condensation for 0.5 h or more, carrying out standing precipitation, and removing the supernatant; then adding a reducing agent, stirring for 0.5 h or more, to eventually obtain a precipitate, carrying out suction filtration, washing to neutral, and carrying out vacuum drying; and in a mixed atmosphere of one or more than two of nitrogen gas, ammonia gas, helium gas, argon gas and hydrogen gas and at the temperature of 100-800 DEG C, carrying out heat treatment for 0.5-5 h, and thus obtaining the precious metal electrocatalyst. The prepared precious metal electrocatalyst can be applied in fuel cells. The preparation method is simple to operate, is environmentally friendly, and is suitable for mass production; the loading capacity of active components of the precious metal electrocatalyst is 0.01-90 wt %, and the carrier selection range is extensive; and the precious metal electrocatalyst has higher oxygen reduction activity, and can be applied in the fuel cells.
Description
technical field [0001] The invention belongs to the field of noble metal electrocatalysts, and relates to a preparation method and application of noble metal electrocatalysts. Background technique [0002] As an important material basis for human survival and development, fossil energy is currently the main energy consumed globally. However, due to its non-renewability and human consumption, fossil energy is gradually becoming exhausted. Moreover, the use of fossil energy will lead to a series of environmental problems, such as the increase in the concentration of pollutants in the atmosphere, the increase of acid rain and smog, the aggravation of the greenhouse effect, the melting of glaciers, global warming, the destruction of the ozone layer, and the exploitation and transportation of fossil energy. affect the ecological environment. Therefore, it is imminent to find renewable clean energy. A fuel cell is a power generation device that directly converts the chemical ene...
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