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Pt-loaded graphene hollow microspherical catalyst and preparation method and application therefor

A graphene and catalyst technology, applied in the field of fuel cells, can solve problems such as cost reduction

Inactive Publication Date: 2016-02-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the new DMFC anode catalyst, there are two main challenges, namely, the improvement of its performance, including activity, reliability and durability; and the reduction of cost

Method used

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  • Pt-loaded graphene hollow microspherical catalyst and preparation method and application therefor
  • Pt-loaded graphene hollow microspherical catalyst and preparation method and application therefor
  • Pt-loaded graphene hollow microspherical catalyst and preparation method and application therefor

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Experimental program
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Effect test

Embodiment 1

[0035] A kind of preparation method of carrying Pt graphene hollow microsphere catalyst specifically comprises the following steps:

[0036] (1) First weigh 2g of graphite powder (Shanghai Colloidal Chemical Factory, chemically pure) and 2g of sodium nitrate (Guangzhou Chemical Reagent Factory, analytically pure) and put them into a dry 1000mL flask, then add them in an ice-water bath with stirring 110 mL of concentrated sulfuric acid (Beijing Chemical Plant, 98.3% analytically pure) with a mass fraction of 98% was stirred for 10 min, and 12 g of potassium permanganate (Guangzhou Chemical Reagent Factory, analytically pure) was added in 5 batches, and the ice bath was removed after 20 min of reaction. Stirring was continued at room temperature for 40 hours, at which time the reactant in the flask turned into a dark brown viscous solution; then 180 mL of distilled water was added to continue the reaction for 10 min (at room temperature), and then 560 mL of warm water (the temper...

Embodiment 2

[0045] A kind of preparation method of carrying Pt graphene hollow sphere catalyst specifically comprises the following steps:

[0046] (1) First weigh 3g of graphite powder (Shanghai Colloidal Chemical Factory, chemically pure) and 3g of sodium nitrate (Guangzhou Chemical Reagent Factory, analytically pure) and put them into a dry 1000mL flask, then add them in an ice-water bath with stirring 110 mL of concentrated sulfuric acid (Beijing Chemical Plant, 98.3% analytically pure) with a mass fraction of 98% was stirred for 15 min, and 18 g of potassium permanganate (Guangzhou Chemical Reagent Factory, analytically pure) was added in 6 batches, and the ice bath was removed after 30 min of reaction. Stirring was continued at room temperature for 45 hours. At this time, the reactant in the flask turned into a dark brown viscous solution; Mass fraction is 30% hydrogen peroxide (Guangzhou Chemical Reagent Factory, 30wt% analytically pure) reaction 1h (it should be pointed out that t...

Embodiment 3

[0054] A kind of preparation method of carrying Pt graphene hollow sphere catalyst specifically comprises the following steps:

[0055] (1) First weigh 5g of graphite powder (Shanghai Colloidal Chemical Factory, chemically pure) and 5g of sodium nitrate (Guangzhou Chemical Reagent Factory, analytically pure) and put them into a dry 1000mL flask, then add them in an ice-water bath with stirring 110 mL of concentrated sulfuric acid (Beijing Chemical Plant, 98.3% analytically pure) with a mass fraction of 98% was stirred for 20 min, and 30 g of potassium permanganate (Guangzhou Chemical Reagent Factory, analytically pure) was added in 6 batches, and the ice bath was removed after 40 min of reaction. Stirring was continued at room temperature for 50 hours. At this time, the reactant in the flask turned into a dark brown viscous solution; Mass fraction is 30% hydrogen peroxide (Guangzhou Chemical Reagent Factory, 30wt% analytically pure) reaction 50min (it should be pointed out tha...

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Abstract

The invention belongs to the technical field of fuel cells, and discloses a Pt-loaded graphene hollow microspherical catalyst and a preparation method and an application therefor. The preparation method comprises the steps of (1) mixing an oxidized graphene water-dispersing solution with a silicon dioxide sphere-dispersing liquid, performing ultrasonic dispersion, freezing and drying to obtain an oxidized graphene / silicon dioxide sphere compound; (2) putting the compound into a tubular furnace for performing thermal processing to obtain black powder; adding the black powder into a strong alkali solution or a strong acid solution for stirring and reacting, filtering, washing and drying to obtain graphene hollow spherical powder; and (3) immersing the graphene hollow spherical powder into a chloroplatinic acid solution or a platinum nitrate solution, performing ultrasonic mixing, freezing and drying to obtain powder; putting the powder into the tubular furnace, performing heating and insulation treatment in an argon-hydrogen mixed gas, then naturally cooling to obtain the Pt-loaded graphene hollow microspherical catalyst. The catalyst prepared by the invention is better in electrocatalytic activity and stability on methanol oxidation.

Description

technical field [0001] The invention belongs to the technical field of fuel cells and relates to an electrocatalyst, in particular to a Pt-loaded graphene hollow microsphere catalyst and a preparation method and application thereof. Background technique [0002] Fuel cells have attracted increasing attention in recent decades due to the increasing demand for energy, coupled with the depletion of fossil fuels and increasing environmental pollution around the world. It has the characteristics of high energy conversion efficiency, low emission and even zero emission. Currently, the production, storage and delivery of hydrogen are major challenges in addition to issues of cost, reliability and durability. Direct Methanol Fuel Cell (DMFC), which utilizes renewable methanol liquid as fuel, has been considered a good choice both in terms of fuel usage and feed method [1,2] . Therefore, compared to hydrogen-supplied fuel cells, since hydrogen fuel cells have a reformer or low-cap...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/88H01M4/926Y02E60/50
Inventor 周灵怡方利国
Owner SOUTH CHINA UNIV OF TECH
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