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Electro-catalyst Pt/amTiO2/rGO and preparation method

An electrocatalyst and fossil technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve current density errors, accelerate rGO corrosion, and unsatisfactory catalytic effects And other issues

Inactive Publication Date: 2015-03-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from its cyclic voltammetry curve Fig.3b that Pt / TiO 2 The positive sweep current density of rGO (I f ) and anti-sweep peak current density error! Reference source not found
The ratio is 0.58, which is lower than the I of Pt / rGO f / I b value (0.68), and is much lower than the I f / I b value (0.91), indicating that Pt / TiO 2 rGO catalysts have poor resistance to toxicity, which may be due to the presence only in TiO 2 The Pt particles at the interface with rGO are in direct contact with rGO, which accelerates the corrosion of rGO during the electrocatalytic oxidation of methanol in methanolic sulfuric acid solution, so the overall catalytic effect of the catalyst is not ideal.

Method used

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  • Electro-catalyst Pt/amTiO2/rGO and preparation method
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  • Electro-catalyst Pt/amTiO2/rGO and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Step 1: Prepare graphene oxide (GO) hydrosol with a concentration of 16.4 mg / mL.

[0026] Step 2: Preparation of amTiO by sol-gel method 2 / GO, sonicate the mixture of 40mL absolute ethanol, 7.8mL deionized water, 360μL glacial acetic acid and 12.2mL GO hydrosol (see step 1) at room temperature for 4h to disperse the mixture evenly; The mixture of water ethanol and 186 μL isopropyl titanate was sonicated at room temperature for 0.5 h; under the condition of magnetic stirring at 25 °C, drop B liquid into A liquid drop by drop, and continue to stir for 1 h to obtain TiO 2 -GO sol; the TiO 2 -GO sol was aged in a water bath at 25°C for 168 hours to obtain amTiO 2 / GO, grind to powder, collect for later use. where amTiO 2 at amTiO 2 Theoretical mass fraction in / GO is 20 wt%.

[0027] Step 3: Preparation of Pt / amTiO by impregnation reduction method 2 / rGO electrocatalyst, 40mg amTiO 2 / GO (see step 2) was added to 40mL ethylene glycol, 7.90mL deionized water and 2.1...

Embodiment 2

[0029] The present embodiment is with embodiment 1 except following feature:

[0030] 40mg amTiO 2 / GO was added to 40mL ethylene glycol, 7.35mL deionized water and 2.65mL 0.019MH 2 PtCl 6 In the mixed liquid of aqueous solution, ultrasonic 0.5h was obtained to obtain the suspension; the obtained suspension was put into an oil bath at 120°C, and magnetically stirred for 24 hours under the condition of condensation and reflux to obtain a black suspension; the black suspension was filtered and washed several times for separation A black solid was obtained, and then the black solid was vacuum-dried at 40°C for 24 hours, ground to a powder and collected, recorded as Pt / amTiO 2 / rGO. Wherein the theoretical mass fraction of noble metal Pt in the catalyst is 20.0wt%.

Embodiment 3

[0032] This example is the same as Example 2 except for the following features: the suspension was reacted in an oil bath at 120° C. for 12 hours.

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Abstract

The invention provides an electro-catalyst Pt / amTiO2 / rGO and a preparation method, and belongs to the technical field of fuel-cell catalysts. The preparation method comprises the following steps: firstly, an improved sol-gel method is adopted to prepare TiO2-GO (graphene oxide) sol, the sol is volatilized naturally in water bath at the temperature of 25 DEG C, and a GO complex amTiO2 / GO uniformly modified by amorphous TiO2 is obtained; and then chloroplatinic acid is taken as a platinum source, ethylene glycol is taken as a solvent and a reducing agent, Pt nanoparticles are loaded on amTiO2 / GO with an impregnation reduction method, meanwhile, GO is reduced to reduced GO rGO, and the electro-catalyst Pt / amTiO2 / rGO is obtained. For the catalyst, an amTiO2 modifier is uniformly dispersed on the surface of rGO, one function of the amTiO2 modifier is to solve the corrosion problem of rGO, another function is to increase the dispersion degree of the loaded Pt nanoparticles, meanwhile, the electrical conductivity of amTiO2 is improved by rGO, so that performance advantages of rGO and amTiO2 can be played sufficiently, the electrocatalytic activity and stability of the catalyst are improved, and the precious metal Pt is used efficiently. The electro-catalyst Pt / amTiO2 / rGO and the preparation method have the advantages of simple technology, easiness in operation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and specifically provides a Pt / amTiO 2 / rGO electrocatalyst and preparation method thereof. Background technique [0002] Direct methanol fuel cells (DMFCs) are ideal for future energy storage and conversion devices due to their high energy density, portability, and environmental friendliness. Pt-based catalysts have long been considered as the most effective anode catalysts for DMFCs, but they still face various problems, such as high cost, carbon corrosion, and CO poisoning, which have become one of the most important problems in the commercialization of DMFCs. Therefore, selecting suitable supports and employing multicomponent structures is a common strategy for designing high-activity and high-stability electrocatalysts. [0003] Graphene has a unique two-dimensional structure and is widely used as an excellent support for electrocatalysts due to its high electrical conductivity...

Claims

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Application Information

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IPC IPC(8): B01J23/42H01M4/92
CPCY02E60/50
Inventor 张慧高艺之李茜茜窦立广
Owner BEIJING UNIV OF CHEM TECH
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