Worm-hole-like mesoporous carbon carrier-loaded PtRu catalyst

A carrier loading and catalyst technology, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of reduced electrochemical area and utilization rate of Pt

Inactive Publication Date: 2018-01-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

When the WMC pore size is larger than twice the Pt particle diameter, the electrochemical area and utilization rate of Pt increase significantly, and its electrocatalytic performance is significantly improved accordingly. However, when the WMC pore size is smaller than the Pt particle diameter, the Pt particles in the WMC channel cannot be used. The electrochemical area and utilization of Pt are significantly reduced

Method used

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  • Worm-hole-like mesoporous carbon carrier-loaded PtRu catalyst

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Embodiment Construction

[0040] 1. Preparation of electrocatalyst carrier (WMC)

[0041] WMC with different pore sizes was used as the support of PtRu to study the effect of different pore sizes on the catalyst activity. The specific preparation method is as follows: according to the predetermined formula (sucrose: pH = 2.0 sulfuric acid solution: TEOS = 2.00g: 3.0mL: 4.0mL), mix the sucrose and sulfuric acid solution, then add TEOS and stir until the mixture becomes a uniform transparent liquid. Then, a predetermined amount of 4wt.% HF solution (Table 3-1) was immediately added as a catalyst, stirred quickly and immediately placed in a constant temperature oven at 40°C for 48 hours, followed by constant temperature at 100°C and 160°C for 6 hours. The obtained sample was carbonized at 900° C. for 3 hours under a nitrogen atmosphere, and then the silicon template was washed away with 40 wt.% HF to obtain a wormholelike mesoporous carbon (WMC). According to the feeding ratio of HF / TEOS, the correspondi...

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Abstract

The invention provides a worm-hole-like mesoporous carbon carrier-loaded PtRu catalyst. WMCs of different pore diameters are synthesized through an improved sol-gel technology; by taking the WMCs as the carriers, a series of WMC-loaded PtRu catalysts are prepared by adopting a pulse microwave-assisting polyhydric alcohol reduction technology; and the physical and chemical properties and electro-catalytic property of the catalysts are subjected to system test and analysis. By researching the PtRu catalysts taking the WMCs of three different pore diameters as the carriers, influence of the porediameters of the carriers to the PtRu electro-catalysis methanol oxidation activity is found through searching. The researching finds that 1), the specific surface area is relatively large under the same appearance; and when carbon carriers of different pore diameters are adopted, the prepared catalyst PtRu granules are basically the same; and 2), the pore diameters of the carriers have a decisiveinfluence on the PtRu catalyst catalysis activity.

Description

technical field [0001] The invention relates to a PtRu catalyst loaded on a wormhole mesoporous carbon carrier, belonging to the technical field of catalysts. Background technique [0002] Direct methanol fuel cell (DMFC) directly uses methanol aqueous solution as the fuel supply source, has the advantages of simple battery structure and high energy density, and has successfully shown that it can be used as a mobile power source and a micro power source for household appliances. However, there is still a big gap between the volume, weight, system integration and practical application requirements of DMFC. This is mainly limited by the fact that the application basis and new technology innovation of DMFC cannot meet the needs of practical applications. There are many scientific and technological problems, such as the slow kinetic process of methanol oxidation, the electrode catalyst is easily poisoned by CO species, and the methanol from anode to cathode. penetration etc. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/1011
CPCY02E60/50
Inventor 刘卫锋秦晓平邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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