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A kind of alloy electrocatalyst and preparation method thereof

An electrocatalyst and catalyst technology, applied in the direction of circuits, electrical components, battery electrodes, etc., to achieve the effect of simple process and easy operation

Active Publication Date: 2017-12-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently TiO 2 TiO in Pt-based catalysts prepared from modified graphene 2 Mostly anatase phase, so far there is no amorphous TiO 2 Modified reduced graphene oxide as a carrier to prepare PtNi alloy catalysts with low Pt content and different Pt:Ni atomic ratios and applied to DMFC anode and cathode catalytic reactions

Method used

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  • A kind of alloy electrocatalyst and preparation method thereof
  • A kind of alloy electrocatalyst and preparation method thereof
  • A kind of alloy electrocatalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Prepare graphene oxide (GO) hydrosol with a concentration of 16.4 mg / mL.

[0035] Step 2: Preparation of amTiO by an improved sol-gel method 2 / GO, sonicate the mixture of 40 mL of absolute ethanol, 7.8 mL of deionized water, 360 μL of glacial acetic acid and 12.2 mL of GO hydrosol (see step 1) at room temperature for 4 hours to disperse the mixture evenly, and record it as liquid A. A mixture of 30 mL of absolute ethanol and 186 μL of isopropyl titanate was sonicated at room temperature for 0.5 h, and recorded as solution B. Under the condition of magnetic stirring at 25°C, drop B solution into A solution drop by drop, and continue to stir for 1h to obtain TiO 2 -GO sol; the TiO 2 -GO sol was left open and aged in a water bath at 25°C for 72 hours to obtain amTiO 2 / GO compound, ground to powder, collected for future use. where amTiO 2 at amTiO 2 The theoretical mass fraction in / GO is 20 wt.%.

[0036] Step 3: Preparation of Pt by ethylene glycol impreg...

Embodiment 2

[0038] The present embodiment is with embodiment 1 except following feature:

[0039] 2.35mL 0.019M H 2 PtCl 6 Aqueous solution, 0.65mL 0.034M Ni(NO 3 ) 2 Aqueous solution, 40mL ethylene glycol and 7.00mL deionized water were added to the three-neck flask, ultrasonically mixed for 0.5h, and then the amTiO 2 40 mg of the / GO complex was placed in a three-neck flask, and ultrasonically treated for 1 h to ensure that the complex was evenly dispersed in the ethylene glycol-water solution. Then the above mixture was condensed and refluxed at 120°C under magnetic stirring for 24h, filtered and washed several times, the obtained product was vacuum-dried at 40°C for 24h, ground to powder and collected to obtain the electrocatalyst Pt 2 Ni 1 / amTiO 2 / rGO, the theoretical Pt:Ni atomic ratio x is 2, the theoretical mass fraction of noble metal Pt in the catalyst is 17.4wt.%, Ni is 2.6wt.%, and the total mass fraction of PtNi is 20wt.%.

Embodiment 3

[0041] The present embodiment is with embodiment 1 except following feature:

[0042] 2.07mL 0.019M H 2 PtCl 6Aqueous solution, 1.16mL 0.034M Ni(NO 3 ) 2 Aqueous solution, 40mL ethylene glycol and 6.77mL deionized water were added to the three-necked flask, ultrasonically mixed for 0.5h, and then the amTiO 2 / GO complex 40mg was added into a three-neck flask, and ultrasonically treated for 1 h to ensure that the complex was evenly dispersed in the ethylene glycol-water solution. Then the above mixture was condensed and refluxed at 120°C under magnetic stirring for 24h, filtered and washed several times, and the obtained product was vacuum-dried at 40°C for 24h, ground to powder and collected to obtain the electrocatalyst Pt 1 Ni 1 / amTiO 2 / rGO, the theoretical Pt:Ni atomic ratio x is 1, the theoretical mass fraction of noble metal Pt in the catalyst is 15.3wt.%, Ni is 4.7wt.%, and the total mass fraction of PtNi is 20wt.%.

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Abstract

The invention discloses an alloy electrocatalyst and a preparation method thereof, and belongs to the technical field of fuel cell catalysts. Chemical components of the catalyst can be described as Pt<x>Ni<1> / amTiO<2> / rGO, wherein Pt accounts for 15.3wt.%-18.0wt.% of total mass of the catalyst; Ni accounts for 2.0wt.%-4.7wt.% of total mass of the catalyst; the total mass of the Pt and the Ni accounts for 20wt.% of total mass of the catalyst; an amTiO<2> / rGO compound accounts for 80wt.% of total mass of the catalyst; and amTiO<2> accounts for 20wt.% of total mass of the amTiO<2> / GO compound. The alloy electrocatalyst has the advantages that size reduction of PtNi alloy particles is promoted; and small sizes and high dispersion of the PtNi particles are beneficial to improvement of the catalytic performance of a synthesized catalyst in positive and negative catalytic reactions of a DMFC. With ethylene glycol as a solvent and a reducing agent, H<2>PtCl<6>, Ni(NO<3>)<2> and GO are simultaneously reduced to prepare the Pt<x>Ni<1> / amTiO<2> / rGO electrocatalyst by an ethylene glycol impregnation-reduction method, so that the technology is simple and the operation is easy.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and specifically provides an alloy electrocatalyst and a preparation method thereof, which is a Pt x Ni 1 / amTiO 2 / rGO alloy electrocatalyst and its preparation method and application. Background technique [0002] At present, noble metal Pt-based materials are mainly used as anode and cathode catalysts in the research and application of direct methanol fuel cells (DMFC), mainly because Pt exhibits the highest electrocatalytic activity and excellent electrocatalytic efficiency among all metal catalysts. . However, due to the high cost of the catalyst, the easy poisoning of the anode catalyst, the high overpotential of the cathode catalyst, and the easy corrosion and oxidation of the carbon support, researchers are increasingly committed to creating anodic electrocatalysts with novel structures and high CO tolerance and low overpotentials. Potential cathode catalyst. [0003] Gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/90H01M4/9058Y02E60/50
Inventor 张慧高艺之陈高文窦立广
Owner BEIJING UNIV OF CHEM TECH