Preparation method of carbon based catalyst with high graphitization degree and used for fuel cell cathode

A fuel cell cathode, carbon-based catalyst technology, applied in physical/chemical process catalysts, battery electrodes, chemical instruments and methods, etc., can solve problems such as pore collapse of materials, limitation of industrialized large-scale production, reduction of specific surface area and pore volume, etc. , to achieve the effect of improving performance, enhancing oxygen reduction catalytic activity, and increasing active sites

Active Publication Date: 2015-01-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent (Application No. 200910248475.1) provides a method for preparing nitrogen-doped catalysts using phenolic resins. Due to the price of resorcinol, its industrial product...

Method used

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  • Preparation method of carbon based catalyst with high graphitization degree and used for fuel cell cathode

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Embodiment 1

[0036] Heat 1.0 g of pitch to softening temperature of 200 °C to form molten precursor A; 50 nm nanometer-sized CaCO 3 Add the hard template to A, and keep stirring to make it evenly mixed to obtain a mixture B, wherein the mass ratio of the hard template to asphalt is 1:2; add a nitrogen-containing precursor to the mixture B, keep stirring for more than 1 hour, and mix evenly , to obtain mixture C, wherein the molar mass ratio of nitrogen-containing precursor hexamethylene diammonium to asphalt is 1:100; the metal salt solution is added to C with the molar ratio of ferric nitrate and asphalt being 1:30, and the stirring is continued to obtain mixture D ; Mixture D was heated at 900°C in NH 3Carbonization treatment under atmosphere protection conditions for 2 hours to obtain solid powder E; soak solid powder E in 1M dilute acid solution for 24 hours, wash, dry, and ball mill to obtain carbon-based catalyst H of the present invention.

Embodiment 2

[0045] Heat 0.5g of asphalt to a softening temperature of 280°C to form a molten precursor A; add 30nm nanometer-sized MgO hard template to A, and keep stirring to make it evenly mixed to obtain a mixture B, in which MgO and asphalt The mass ratio is 1:2; add nitrogen-containing precursor melamine to mixture B, continue to stir for 2 hours, and mix uniformly to obtain mixture C, wherein the molar mass ratio of nitrogen-containing precursor to asphalt is 1:100; Add metal salt solution to C at a ratio of 1:50, and continue to stir to obtain mixture D; carbonize mixture D at 800°C under ammonia atmosphere protection conditions for 2 hours to obtain solid powder E; solid powder E at 0.5 Soak M in a dilute acid solution for 24 hours, wash, dry, and ball mill for 3 hours to obtain the carbon-based catalyst H of the present invention.

Embodiment 3

[0047] Heat 0.5g of pitch to the softening temperature of 180°C to form molten precursor A; put 0.5g of SiO 2 (SBA-15) Add the hard template to A, and keep stirring to make it mix uniformly to obtain mixture B; add nitrogen-containing precursor melamine to mixture B, continue stirring for 2 hours, and mix uniformly to obtain mixture C, which contains nitrogen The molar mass ratio of the precursor to the asphalt is 1:300; the metal salt solution is added to C with the molar ratio of cobalt nitrate and asphalt being 1:20, and the stirring is continued to obtain the mixture D; the mixture D is protected in a nitriding atmosphere at 1000 Carbonization treatment under conditions for 2 hours to obtain solid powder E; soak solid powder E in 0.5M dilute acid solution for 24 hours, wash, dry, and ball mill for 3 hours to obtain carbon-based catalyst H of the present invention.

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Abstract

The invention relates to a preparation method of a carbon based catalyst with high graphitization degree and used for a fuel cell cathode. The method is as below: using pitch as a carbon precursor, heating and melting the precursor by high temperature, and immersing the precursor in a template agent; mixing evenly, adding a nitrogen-containing precursor, and adding metal salt; then carrying out drying, high temperature treatment and two times of nitridation; then washing in an acidic solution and removing the template; and finally filtering, washing and drying to obtain the nitrogen doped carbon based catalyst material with high degree of graphitization. The catalyst has high graphitization degree, high specific surface area and ordered pore structure. The catalyst used as the cathode catalyst for a proton exchange membrane fuel cell shows good oxygen reduction activity, and the catalyst is environment-friendly, low in cost, microscopic controllable, and rich in resources, and is expected to become electric catalyst for proton exchange membrane fuel cells.

Description

technical field [0001] The invention relates to the field of fuel cell catalyst preparation, in particular to a method for preparing a cathode catalyst. Background technique [0002] As a kind of fuel cell, proton exchange membrane fuel cell (PEMFC) uses pure hydrogen or purified reformed gas as fuel and perfluorosulfonic acid membrane as electrolyte, and can operate stably between room temperature and 100 °C , so it has the characteristics of rapid start-up at room temperature, no electrolyte loss, no pollutant discharge, high specific power and specific energy. In the future hydrogen energy era where hydrogen is the main energy carrier, proton exchange membrane fuel cells have broad application prospects as electric vehicle power sources, mobile power sources and decentralized power stations. [0003] Electrocatalyst is one of the key materials of proton exchange membrane fuel cell (PEMFC). At present, the cathode oxygen reduction catalyst of fuel cell is mainly Pt / C cata...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 钟和香张华民邓呈维邱艳玲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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