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Preparation method of carbon film coated platinum/graphene catalyst

A graphene and catalyst technology, applied in the field of platinum/graphene catalyst preparation, to achieve excellent reactivity and improve cycle performance

Inactive Publication Date: 2014-09-03
安徽百特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Until now, how to protect platinum nanoparticles from long-term erosion in corrosive environments and improve their resistance to methanol poisoning is still a challenge.

Method used

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  • Preparation method of carbon film coated platinum/graphene catalyst
  • Preparation method of carbon film coated platinum/graphene catalyst
  • Preparation method of carbon film coated platinum/graphene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 40 parts by mass of glucose, 1 part by mass of polyvinylpyrrolidone, and 0.5 parts by mass of chloroplatinic acid to 1000 parts by mass of 0.05wt% graphene oxide dispersion, stir magnetically for 15 minutes and ultrasonically for 20 minutes to obtain a uniform of the dispersion. The dispersion was put into a hydrothermal kettle and heated at 180°C for 8 hours. The black liquid obtained after hydrothermal treatment was successively washed with deionized water (8-10 times) and ethanol (at least 10 times) and centrifuged until the supernatant was colorless. The resulting platinum / graphene catalyst was freeze-dried to constant weight with a platinum loading of 7.4 wt%.

[0029] (2) Add platinum / graphene powder into a ceramic crucible and put it into a tube furnace (SGL-1200, Shanghai Daheng Optical and Precision Instrument Co., Ltd.), at a flow rate of 50 L h -1 In a nitrogen atmosphere, heated at 700 °C for 3 hours, with a heating rate of 10 °C min -1 , and natu...

Embodiment 2

[0031] (1) Add 1 mass part of polyvinylpyrrolidone and 0.5 mass part of chloroplatinic acid to 1000 mass parts of 0.05wt% graphene oxide dispersion, magnetically stir for 15 minutes and sonicate for 20 minutes to obtain a uniform dispersion. The dispersion was put into a hydrothermal kettle and heated at 180°C for 8 hours. The black liquid obtained after hydrothermal treatment was successively washed with deionized water (2-3 times) and ethanol (at least 2 times) and centrifuged until the supernatant was colorless. The resulting platinum / graphene catalyst was freeze-dried to constant weight with a platinum loading of 23.4 wt%.

[0032] (2) Add platinum / graphene powder into a ceramic crucible, put it into a tube furnace, and put it into a tube furnace at a flow rate of 50 L h -1 In a nitrogen atmosphere, heated at 700 °C for 3 hours, with a heating rate of 10 °C min -1 , and naturally cooled in a nitrogen atmosphere to obtain a platinum / graphene catalyst with a carbon coating...

Embodiment 3

[0034](1) Add 40 parts by mass of glucose, 20 parts by mass of polyvinylpyrrolidone, and 10 parts by mass of chloroplatinic acid to 20,000 parts by mass of 0.05wt% graphene oxide dispersion, stir magnetically for 15 minutes and ultrasonically for 20 minutes to obtain a uniform of the dispersion. The dispersion was put into a hydrothermal kettle and heated at 180°C for 3 hours. The black liquid obtained after hydrothermal treatment was successively washed with deionized water (3-5 times) and ethanol (at least 5 times) and centrifuged until the supernatant was colorless. The resulting platinum / graphene catalyst was freeze-dried to constant weight.

[0035] (2) Add platinum / graphene powder into a ceramic crucible, put it into a tube furnace, and put it into a tube furnace at a flow rate of 50 L h -1 In a nitrogen atmosphere, heated at 600 °C for 1 hour, with a heating rate of 10 °C min -1 , and naturally cooled under a nitrogen atmosphere during cooling, a platinum / graphene ca...

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Abstract

The invention discloses a preparation method of a carbon film coated platinum / graphene catalyst. Graphene is adopted as a carrier for the catalyst to hydrothermally reduce oxidized graphene, saccharides, polyvinyl pyrrolidone and chloroplatinic acid, and then high-temperature carbonization is carried out to obtain a cathode oxygen reduction reaction catalyst of a fuel battery, wherein the platinum loading amount is 10-50wt%. The catalyst has excellent methanol tolerance and catalytic cycle stability, the performances of the catalyst are greatly improved in 1000 times of cyclic voltammetry testing, and the catalyst is superior to the commercial platinum / carbon catalyst.

Description

technical field [0001] The invention relates to a method for preparing a cathode oxygen reduction reaction catalyst for a fuel cell, in particular to a method for preparing a carbon film-coated platinum / graphene catalyst. Background technique [0002] At present, the commonly used fuel cell cathode oxygen reduction reaction catalyst is a carbon-supported platinum-based catalyst. Although the platinum / carbon catalyst has good catalytic performance for the oxygen reduction reaction, it suffers from catalyst particle shedding, aggregation, and poor methanol tolerance. A series of serious problems such as poor cycle stability make it difficult to meet the needs of actual use. Alloying, morphology control, and carrier loading are three possible avenues to address these issues. Among them, as a two-dimensional layered material with ultra-high specific surface area, excellent electrochemical stability and electrical conductivity, graphene is expected to be widely used in the prepa...

Claims

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Application Information

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IPC IPC(8): B01J23/42H01M4/92
CPCY02E60/50
Inventor 卢红斌宋文雅陈仲欣杨子平南玉龙邰嘉坡胡建彤
Owner 安徽百特新材料科技有限公司
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