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Palladium/titanium dioxide/graphene catalyst and preparation method thereof

A technology of titanium dioxide and graphene, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to improve corrosion resistance, simple method and process, and good oxygen reduction catalysis active effect

Inactive Publication Date: 2013-10-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of palladium / titanium dioxide / graphene catalyst and preparation method thereof, and TiO 2 Evenly covered on the surface of G (graphene) to form a composite carrier, you can use uniformly covered TiO 2 Layer to solve the corrosion problem of G, and can use G to improve TiO 2 conductivity, so as to give full play to the G and TiO 2 Performance advantages of the two types of carriers

Method used

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  • Palladium/titanium dioxide/graphene catalyst and preparation method thereof
  • Palladium/titanium dioxide/graphene catalyst and preparation method thereof
  • Palladium/titanium dioxide/graphene catalyst and preparation method thereof

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Embodiment 1

[0032] (1) Preparation of graphite oxide: take 2 grams of graphite to prepare graphite concentration of 40 grams per liter of H 2 SO 4 Suspension 0.05 L, then weigh 0.2 g KMnO 4 Slowly add to the above H under ice bath 2 SO 4 suspension, 30 o Stir and react for 3 hours at C; add deionized water to the above suspension, dilute the graphite concentration to 0.6 g / L, and raise the temperature to 90 o C reacted for 20 minutes; weighed 0.4 g of 0.5% H 2 o 2 The solution was added to the above reaction solution to terminate the reaction; washed with 1 mol / L HCl solution, centrifuged at 3000 rpm to remove the supernatant, and repeated several times until no SO4 was detected in the supernatant 4 2- ; the collected samples at 60 o C vacuum dried for 10 hours to obtain graphite oxide.

[0033] (2) Pd / TiO 2 Preparation of (5%) / G: Weigh 0.1 gram of graphite oxide and disperse it in methanol solvent to prepare 0.2 liters of a suspension with a graphite oxide concentration of 0.5 ...

Embodiment 2

[0037] (1) Preparation of graphite oxide: Weigh 2.174 grams of graphite to prepare graphite H with a graphite concentration of 43.48 grams per liter. 2 SO 4 Suspension 0.05 L, then weighed 0.145 g KMnO 4 Slowly add to the above H under ice bath 2 SO 4 suspension, 35 o Stir the reaction at C for 2 hours; add deionized water to the above suspension, dilute the graphite concentration to 0.9 g / L, and raise the temperature to 95 o C reacted for 15 minutes; Weighed 0.403 grams of H with a mass fraction of 0.6% 2 o 2 The solution was added to the above reaction solution to terminate the reaction; washed with 1.25 mol / L HCl solution, centrifuged at 4000 rpm to remove the supernatant, and repeated several times until no SO4 was detected in the supernatant 4 2- ; the collected samples at 50 o C vacuum dried for 12 hours to obtain graphite oxide.

[0038] (2) Pd / TiO 2 Preparation of / G: Weigh 0.1 gram of graphite oxide and disperse it in ethylene glycol solvent to prepare 0.12...

Embodiment 3

[0042] (1) Preparation of graphite oxide: take 2 grams of graphite to prepare graphite H with a graphite concentration of 50 g / L 2 SO 4 Suspension 0.04 L, then weigh 0.1 g KMnO 4 Slowly add to the above H under ice bath 2 SO 4 suspension, 40 o Stir the reaction at C for 1 hour; add deionized water to the above suspension, dilute the graphite concentration to 1.2 g / L, and raise the temperature to 100 o C reacted for 10 minutes; Weighed 0.333 grams of H with a mass fraction of 0.75% 2 o 2 The solution was added to the above reaction solution to terminate the reaction; washed with 1.5 mol / L HCl solution, centrifuged at 5000 rpm to remove the supernatant, and repeated several times until no SO4 was detected in the supernatant 4 2- ; Collected samples at 40 o C vacuum dried for 14 hours to obtain graphite oxide.

[0043] (2) Pd / TiO 2 Preparation of / G: Weigh 0.1 gram of graphite oxide and disperse it in a glycerol solvent to prepare 0.1 liter of a suspension with a graphi...

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Abstract

The invention relates to a palladium / titanium dioxide / graphene catalyst and a preparation method thereof, belonging to the technical field of electrocatalysts. The catalyst comprises chemical components of Pd / TiO2 / G, wherein G is the graphene, the TiO2 / G is a catalyst carrier, the amorphous state TiO2 is uniformly covered on the surface of G, so that the corrosion resistance of G is improved, and the electrical conductivity of the TiO2 is improved by G,; the grain size of the catalytic activity component Pd is 2-4 nanometer, the Pd are uniformly distributed on the surface of the TiO2 / G carrier. The catalyst has good electro-catalysis oxygen reduction activity, methyl alcohol resistance and stability. The preparation method of the catalyst comprises the following steps of uniformly covering the amorphous state TiO2 on the G through titanium compound hydrolysis so as to prepare a TiO2 / G composite carrier, and loading the Pd particles on the TiO2 / G composite carrier through low carbon alcohol reducing action, so as to prepare the Pd / TiO2 / G catalyst. The preparation method has the characteristics of being simple in technology, easy to operate and the like.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysts, in particular to a palladium / titanium dioxide / graphene catalyst and a preparation method thereof, which are suitable for high-activity, methanol-resistant direct methanol fuel cells. Background technique [0002] Direct Methanol Fuel Cell (DMFC) has high energy density, abundant fuel sources, no intermediate reforming or reforming devices, low pollutant emissions, and low operating temperature (60-100 o C), and has drawn attention for its ease of handling liquid fuels. Pt-based catalyst is currently the most effective catalyst for cathode oxygen reduction reaction (ORR), but its resources are scarce and expensive. At the same time, due to the problem of methanol permeation in methanol fuel cells, Pt-based catalysts are easy to catalyze the oxidation of methanol to form a mixed potential, which seriously reduces the efficiency of the battery. Therefore, it is of great significance to fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/92H01M4/88B01J23/44
CPCY02E60/50
Inventor 杨文胜赵莹莹
Owner BEIJING UNIV OF CHEM TECH
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