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Graphene supported palladium nanoparticle composite material as well as preparation method and application thereof

A composite material and graphene technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as lack of functional groups and hindrance of catalytic activity

Active Publication Date: 2020-10-20
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inertness of pristine graphene and the lack of functional groups, Pd is very easy to form large particle agglomerations, and the stacking between graphenes will also hinder its catalytic activity.
So far, it is still a serious challenge to grow Pd nanoparticles with uniform distribution and small size on the surface of graphene.

Method used

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  • Graphene supported palladium nanoparticle composite material as well as preparation method and application thereof
  • Graphene supported palladium nanoparticle composite material as well as preparation method and application thereof
  • Graphene supported palladium nanoparticle composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of graphene-supported palladium nanoparticle composites

[0039]Add 2mg of adenine into 20mL of ethylene glycol, ultrasonicate until the adenine is evenly dispersed, then add 20mg of original graphene, ultrasonicate for 1h until the original graphene is evenly dispersed, then stir for 10h until part of the adenine is adsorbed on the surface of the original graphene. The binding sites were introduced on the graphene surface, and then 8.6mg Pd(NO 3 ) 2 2H 2 O, sonicate for 20min until the palladium source is evenly dispersed, then stir for 1h until Pd(NO 3 ) 2 2H 2 Palladium ions in O are effectively combined with the binding sites to obtain a reaction solution. After adding NaOH solution to adjust the pH of the reaction solution to 12.5, reflux and stir at 150°C for 3 hours, then filter and wash, and dry the solid phase in a vacuum oven. 24 hours, that's all.

Embodiment 2

[0047] Preparation of graphene-supported palladium nanoparticle composites

[0048] Add 1mg of adenine to 20mL of ethylene glycol, ultrasonicate until the adenine is evenly dispersed, then add 4mg of original graphene, ultrasonicate for 1h until the original graphene is evenly dispersed, then stir for 10h until part of the adenine is adsorbed on the surface of the original graphene. The graphene surface introduces binding sites, and then adds 0.9mg Pd(NO 3 ) 2 2H 2 O, sonicate for 20min until the palladium source is evenly dispersed, then stir for 1h until Pd(NO 3 ) 2 2H 2 Palladium ions in O are effectively combined with the binding sites to obtain a reaction solution. After adding NaOH solution to adjust the pH of the reaction solution to 11, reflux and stir the reaction at 150°C for 5 hours, then filter and wash the solid phase, and dry the solid phase in a vacuum oven. 12 hours, that's all.

[0049] Figure 5 Be the FESEM figure of the composite material prepared in...

Embodiment 3

[0052] Preparation of graphene-supported palladium nanoparticle composites

[0053] Add 3mg of adenine into 30mL of ethylene glycol, ultrasonicate until the adenine is evenly dispersed, then add 24mg of original graphene, ultrasonicate for 2h until the original graphene is evenly dispersed, then stir for 12h until part of the adenine is adsorbed on the surface of the original graphene. The binding sites were introduced on the graphene surface, and then 10.3 mg Pd(NO 3 ) 2 2H 2 O, sonicate for 20min until the palladium source is evenly dispersed, then stir for 2h until Pd(NO 3 ) 2 2H 2 Palladium ions in O are effectively combined with the binding sites to obtain a reaction solution. After adding NaOH solution to adjust the pH of the reaction solution to 12.5, reflux and stir at 160°C for 4 hours, then filter and wash, and dry the solid phase in a vacuum oven. 24 hours, that's all.

[0054] Figure 7 Be the FESEM figure of the composite material prepared in embodiment 3, ...

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Abstract

The invention relates to a graphene supported palladium nanoparticle composite material as well as a preparation method and application thereof, and belongs to the technical field of materials. The method comprises the following steps: adding adenine into ethylene glycol until adenine is uniformly dispersed; adding graphene until the graphene is uniformly dispersed, and performing stirring until part of adenine is adsorbed on the surface of the graphene; introducing binding sites to the surface of graphene, adding a palladium source until the palladium source is uniformly dispersed, performingstirring until palladium ions in the palladium source are effectively combined with the binding sites to obtain a reaction solution, regulating the pH value of the reaction solution to 7-12.5, carrying out reflux stirring reaction at a temperature of 150-180 DEG C, carrying out solid-liquid separation, washing the solid phase, and performing drying. High-dispersion palladium nanoparticles with ultra-small sizes are uniformly distributed on graphene in the composite material, and the composite material has very high formic acid oxidation catalytic activity and stability when being used as a catalyst of a direct formic acid fuel cell. And the method is simple, convenient and quick to operate, saves the cost for actual manufacturing, and is suitable for expanded production.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a graphene-supported palladium nanoparticle composite material and a preparation method and application thereof. Background technique [0002] Direct formic acid fuel cell (DFAFC) is the most promising due to its high theoretical open circuit voltage (1.48 V) and low operating temperature, while its fuel formic acid (FA) has low membrane permeability and is easy to transport and store. One of the energy conversion devices. In DFAFC, Pt is still the most commonly used catalyst, but Pt is expensive and its reserves are scarce, Pd is cheaper and more abundant than Pt, and its catalytic efficiency is also higher, so Pd is the most likely to replace Pt as a catalyst for fuel cells. However, compared with Pt, Pd oxide is more stable, and it is more difficult to reduce to a simple form, so it is difficult to obtain smaller particles, so that a larger electrochemical activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92H01M8/22B82Y30/00
CPCH01M4/8825H01M4/926H01M4/921H01M8/22B82Y30/00Y02E60/50Y02P70/50
Inventor 袁伟永杨其毅李长明
Owner SOUTHWEST UNIVERSITY
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