Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Electro-catalyst of Ni@Au@Pd three-layer core-shell structure with reduced graphene oxide as carrier and preparation method thereof

A technology of electrocatalyst and core-shell structure, applied in the field of electrocatalyst and its preparation, can solve the problems of inability to catalyze the anode process of ethanol oxidation and cathode oxygen reduction reaction at the same time, high cost and poor stability of noble metal catalysts, and achieve excellent catalytic performance, Excellent electrochemical performance and the effect of reducing catalyst cost

Active Publication Date: 2017-07-14
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high cost, easy poisoning, poor stability and inability to simultaneously catalyze ethanol oxidation (EOR) anode process and cathode oxygen reduction reaction in the prior art, and to provide a method for reducing graphene oxide Electrocatalyst with Ni@Au@Pd three-layer core-shell structure as carrier and its preparation method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electro-catalyst of Ni@Au@Pd three-layer core-shell structure with reduced graphene oxide as carrier and preparation method thereof
  • Electro-catalyst of Ni@Au@Pd three-layer core-shell structure with reduced graphene oxide as carrier and preparation method thereof
  • Electro-catalyst of Ni@Au@Pd three-layer core-shell structure with reduced graphene oxide as carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An electrocatalyst with a three-layer core-shell structure of Ni@Au@Pd based on reduced graphene oxide. Using reduced graphene oxide as a carrier, it is assembled with a thin shell of noble metal Au and Pd on the surface of non-noble metal core Ni to prepare a The average metal nanoparticle size is 7.4nm, with a special three-layer structure of "core-middle layer-shell", which is uniformly dispersed in the multifunctional three-layer core-shell structure electrocatalyst Ni@Au@Pd- rGO.

[0031] The massfraction of Ni is 18% of gained electrocatalyst in the present embodiment; Namely:

[0032] m Ni %=m Ni / (m rGO +m Ni +m Au +m Pd )=14.3 / (50+14.3+7.55+7.2)=18%

[0033] The massfraction of Au is 9.6% of gained electrocatalyst in the present embodiment; Namely:

[0034] m Au %=m Au / (m rGO +m Ni +m Au +m Pd )=7.55 / (50+14.3+7.55+7.2)=9.6%

[0035] The massfraction of Pd is 9.1% of gained electrocatalyst in the present embodiment; Namely:

[0036] m Pd %=m P...

Embodiment 2

[0044] 1) Prepare 500ml of potassium hydroxide solution of 2.0mol / L, prepare 500ml of potassium hydroxide solution of 2.0mol / L and 1.0mol / L of ethanol solution.

[0045] 2) Using 985 μl ethanol as a solvent and 15 μl Nafion solution as a binder, 2 mg of Ni@Au@Pd-rGO catalyst was prepared into a 2 mg / ml dispersion liquid, and ultrasonically dispersed.

[0046] 3) Take 10 μl of dispersed liquid droplet on the rotating disk electrode (disc area is 0.25cm 2 ), in 2.0mol / L potassium hydroxide solution, N 2 After purging for 30 min, a cyclic voltammetry scan (CV) was performed. After the CV curve is stable, the solution is replaced with 2.0mol / L potassium hydroxide and 1.0mol / L ethanol solution, N 2 After purging for 30 min, the catalytic performance of Ni@Au@Pd-rGO catalyst for ethanol oxidation (EOR) was determined by cyclic linear voltammetry with a scan range of -0.9-0.2V vs. Hg / HgO. from image 3 It can be seen that the nanoparticle catalyst Ni@Au@Pd-rGO with a three-layer ...

Embodiment 3

[0048] 1) Using n-propanol as a solvent, disperse a non-noble metal catalyst with a mass fraction of 3.5% (the ratio of the catalyst to the ionomer is 7:3), and disperse it ultrasonically. The dispersion was evenly sprayed on carbon paper as the cathode of DEFC.

[0049] 2) Using n-propanol as a solvent, disperse the nanoparticle catalyst Ni@Au@Pd-rGO with a core-shell structure, and use 5% polytetrafluoroethylene (PTFE) as a binder (Ni@Au@Pd-rGO and PTFE The mass ratio is 9:1), ultrasonically dispersed. Spray the dispersion evenly on the carbon cloth with a mass fraction of 0.5mg Pd / cm 2 , as the anode of DEFC.

[0050] 3) Assemble the graphite flow field plate, anode carbon cloth, proton exchange membrane, and cathode carbon paper into a DEFC battery, and connect it to a fuel cell test system (Arbin BT2000) to test the performance of the DEFC battery. The anode fuel is 6.0mol / L potassium hydroxide and 3.0mol / L ethanol solution, and the cathode gas is oxygen. Voltage and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to an electro-catalyst of a Ni@Au@Pd three-layer core-shell structure with reduced graphene oxide as a carrier and a preparation method thereof, and belongs to the field of composite materials. The invention adopts a Hummers method to prepare the reduced graphene oxide. The preparation method comprises the following steps: preparing NiCl2 and GO into a mixed solution, using NaBH4 to reduce Ni2+, and obtaining a Ni atom; adding HAuCl4 solution, and using the displacement reaction of Ni and Au3+ to obtain Au; coating the Au on the Ni surface, and forming a Ni@Au two-layer core shell; adding H2PdCl4 solution, reducing Pd2+, and obtaining a Pd atom; and coating Pd on the Ni@Au surface, and forming the Ni@Au@Pd three-layer core-shell structure and loading the Ni@Au@Pd three-layer core-shell structure on the reduced graphene oxide. The preparation method is simple in steps and makes full use of raw materials. The product has distinct and unique morphological characteristics of the core shell structure, and has good catalytic performance for ethanol oxidation and oxygen reduction reactions.

Description

technical field [0001] The invention relates to a Ni@Au@Pd three-layer core-shell structure electrocatalyst with reduced graphene oxide as a carrier and a preparation method thereof, belonging to the field of composite materials. Background technique [0002] As an important electrochemical reaction in direct ethanol fuel cell (DEFC), the anode catalytic reaction plays a vital role in improving the efficiency of the battery. At present, the anode catalysts with the best catalytic performance are mainly noble metal catalysts such as Pt-based. Due to the high price and high cost of Pt, and the easy occurrence of catalyst poisoning in the catalytic ethanol oxidation (EOR) process, the improvement and development of the performance of anode catalysts and DEFCs are restricted. The cathode catalyst that catalyzes the cathode oxygen reduction reaction is also dominated by commercial Pt / C. [0003] As nanoparticles with a special structure, the core-shell structure exhibits unique...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/92B01J23/89
CPCB01J23/892H01M4/921H01M4/925Y02E60/50
Inventor 孙克宁王芳王珺乔金硕
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com