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A kind of composite fuel cell cathode catalyst ngpc/ncnts and preparation method thereof

A fuel cell cathode and electrocatalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as high cost, and achieve the effects of speeding up the mass transfer process, simple and controllable preparation method, and low synthesis cost

Active Publication Date: 2018-09-28
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention discloses a composite fuel cell cathode electrocatalyst NGPC / NCNTs and a preparation method thereof, aiming to develop a cheap and efficient non-precious metal catalyst to solve the existing high cost problem of using platinum-based materials as fuel cell cathode catalysts

Method used

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  • A kind of composite fuel cell cathode catalyst ngpc/ncnts and preparation method thereof
  • A kind of composite fuel cell cathode catalyst ngpc/ncnts and preparation method thereof
  • A kind of composite fuel cell cathode catalyst ngpc/ncnts and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] (1) Pre-carbonize MOF-5(Zn) at 550°C under a nitrogen atmosphere for 1 hour, wash with 1mol / L hydrochloric acid to remove metal components, wash with water until neutral, and dry at 80°C to obtain pre-carbonized porous carbon powder;

[0026] (2) Add 0.1 g of pre-carbonized porous carbon powder into 10 mL of aqueous solution dissolved with 0.3 mmol of nickel formate, stir at room temperature for 12 hours, evaporate the water to dryness at 50 °C with a rotary evaporator, and dry the obtained solid sample 1. After grinding, heat treatment at 1000°C for 3 hours under nitrogen atmosphere, and then hydrothermally treat the obtained product with a mixture of 10mol / L hydrochloric acid and 1.25wt.% hydrogen peroxide at 160°C for 24 hours, then wash with water until neutral, and vacuum at 60°C Dried to obtain graphitized porous carbon;

[0027] (3) Place 0.1 g of the above-mentioned graphitized porous carbon in 20 mL of 34 wt.% sulfuric acid solution and soak for 4 hours, then ...

Embodiment 2

[0030] (1) Pre-carbonize ZIF-8(Zn) at 500°C for 1 hour under an argon atmosphere, wash with 1mol / L hydrochloric acid to remove metal components, wash with water until neutral, and dry at 85°C to obtain a pre-carbonized porous carbon powder;

[0031] (2) Add 0.1 g of pre-carbonized porous carbon powder into 10 mL of aqueous solution dissolved with 0.6 mmol of ferric chloride, stir at room temperature for 12 hours, evaporate the water to dryness with a rotary evaporator at 50 ° C, and dilute the obtained solid After the sample was dried and ground, it was heat-treated at 1000°C for 3 hours under an argon atmosphere. Vacuum drying at ℃ to obtain graphitized porous carbon;

[0032] (3) 0.1 g of the above-mentioned graphitized porous carbon was placed in 20 mL of 34 wt.% sulfuric acid solution and soaked for 6 hours, then centrifuged and dried, and mixed with 0.5 g of dicyandiamide in 15 mL of water, and stirred at 60° C. for 12 hours, The water was evaporated to dryness at 50°C ...

Embodiment 3

[0035] (1) Pre-carbonize HKUST-1(Cu) under an argon atmosphere at 600°C for 1 hour, wash with 1mol / L hydrochloric acid to remove metal components, wash with water until neutral, and dry at 65°C to obtain pre-carbonized porous carbon powder;

[0036] (2) Add 0.1 g of pre-carbonized porous carbon powder into 10 mL of aqueous solution dissolved with 0.9 mmol of cobalt nitrate, stir at room temperature for 12 hours, evaporate the water to dryness at 50 °C with a rotary evaporator, and dry the obtained solid sample 1. After grinding, heat treatment at 1000°C for 1 hour under argon atmosphere, and then hydrothermally treat the obtained product with a mixture of 10mol / L hydrochloric acid and 1.25wt.% hydrogen peroxide at 120°C for 24 hours, then wash with water until it is neutral, and place it at 60°C vacuum drying to obtain graphitized porous carbon;

[0037] (3) Place 0.1 g of the above-mentioned graphitized porous carbon in 25 mL of 34 wt.% sulfuric acid solution and soak for 8 ...

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Abstract

The invention discloses a compound type fuel cell cathode catalyst NGPC / NCNTs and a preparation method thereof, belongs to the technical field of catalyst preparation and aims to develop a cheap and efficient non-precious metal catalyst to solve the problem of high cost of a fuel cell cathode catalyst made of a Pt-based material. An MOF (metal-organic framework) material as a C source of the NGPC / NCNTs is pre-carbonized at a low temperature firstly, a graphitization catalyst and a N source are introduced step by step, two times of corresponding high-temperature heat treatment are performed, and the NGPC / NCNTs are prepared. The active component of the NGPC / NCNTs is N-doped graphitized porous C or CNTs, a pore structure is in a micropore-mesopore compound type, and a continuous conduction framework in three-dimensional space is formed through structural connection of dispersed porous C particles by the CNTs, so that the NGPC / NCNTs have good conductivity and higher mass transfer rate and can show efficient catalytic activity, methyl alcohol tolerance and cycle stability, which are better than those of a commercial Pt / C electrocatalyst, in an alkaline medium.

Description

technical field [0001] The invention relates to a composite fuel cell cathode catalyst NGPC / NCNTs and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Fuel cells have attracted extensive attention due to their many advantages such as high energy conversion efficiency, good reliability, low pollution, and a wide range of fuel choices, and have been successfully applied to the energy supply of motor vehicles. However, due to the large overpotential caused by the low reactivity of the cathodic oxygen reduction reaction (ORR), high-loaded electrocatalysts are often required to achieve high power density output. At present, the main cathode electrocatalyst used in low-temperature fuel cells is platinum on carbon (Pt / C), and Pt is precious and scarce, making it difficult for large-scale commercial application of fuel cell technology. Therefore, the development of cheap and efficient oxygen reduction electrocatal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/96
CPCH01M4/90H01M4/96Y02E60/50
Inventor 张林杰王瑞虎洪茂椿孙小飞苏燕清
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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