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A kind of graphene-loaded palladium nanoparticle composite material and its preparation method and application

A graphene and palladium nanotechnology, applied in the field of materials, can solve problems such as hindering catalytic activity and lack of functional groups, and achieve the effects of inhibiting excessive growth, improving utilization, and improving dispersibility

Active Publication Date: 2022-04-15
SOUTHWEST UNIV
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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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  • A kind of graphene-loaded palladium nanoparticle composite material and its preparation method and application
  • A kind of graphene-loaded palladium nanoparticle composite material and its preparation method and application
  • A kind of graphene-loaded palladium nanoparticle composite material and its preparation method and application

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 and a preparation method and application thereof, belonging to the field of material technology. The method is as follows: add adenine to ethylene glycol until the adenine is evenly dispersed, then add graphene until the graphene is evenly dispersed, then stir until part of the adenine is adsorbed on the graphene surface, thereby introducing a binding site on the graphene surface, and then Add the palladium source until the palladium source is evenly dispersed and stir until the palladium ions in the palladium source are effectively combined with the binding sites to obtain a reaction solution. After adjusting the pH of the reaction solution to 7-12.5, reflux at 150-180°C and stir the solid-liquid after the reaction Separation, washing and drying the solid phase. In the composite material, highly dispersed palladium nanoparticles with ultra-small size are evenly distributed on the graphene, which is used as a catalyst for direct formic acid fuel cells, and has very high catalytic activity and stability for formic acid oxidation. Moreover, the method is simple and quick to operate, saves cost for actual production, and is suitable for enlarged 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 Patents(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 UNIV
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