Graphene loaded Co-N-C oxygen reduction catalyst and preparation method thereof

A graphene and catalyst technology, applied in the field of new energy materials, can solve the problems of increasing the cost of proton exchange membrane fuel cells, restricting commercialization, production process, and cannot reduce the use of platinum particles, etc., to achieve good stability and conductivity , improve the catalytic ability, the effect of simple reaction conditions

Inactive Publication Date: 2016-02-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of platinum, which increases the cost of proton exchange membrane fuel cells, and platinum metal has superior catalytic performan...

Method used

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  • Graphene loaded Co-N-C oxygen reduction catalyst and preparation method thereof
  • Graphene loaded Co-N-C oxygen reduction catalyst and preparation method thereof
  • Graphene loaded Co-N-C oxygen reduction catalyst and preparation method thereof

Examples

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Embodiment 1

[0028] A kind of graphene supported Co-N-C oxygen reduction catalyst, its preparation method comprises the following steps:

[0029] 1) Add 0.5 g of graphene oxide into a single-necked flask, and add 60 mL of deionized water, stir and dissolve at room temperature for 2 h, then transfer the resulting mixture to a centrifuge tube, and collect the bottom precipitate I by centrifugation;

[0030] 2) Add cobalt acetate and 2-methylimidazole respectively into a 100mL beaker, add 15mL deionized water, and stir evenly to obtain cobalt acetate solution with a concentration of 0.11mol / L and 2-methylimidazole with a concentration of 1.11mol / L, respectively. Imidazole solution; first add 2-methylimidazole solution to the precipitate I obtained in step 1), stir at room temperature for 1 h, then transfer the mixture to a centrifuge tube, and collect the precipitate II at the bottom by centrifugation; then add the cobalt acetate solution Add to the precipitate II, stir at room temperature fo...

Embodiment 2

[0035] A kind of graphene supported Co-N-C oxygen reduction catalyst, its preparation method comprises the following steps:

[0036] 1) Add 0.5 g of graphene oxide into a single-necked flask, and add 60 mL of deionized water, stir and dissolve at room temperature for 2 h, then transfer the resulting mixture to a centrifuge tube, and collect the bottom precipitate I by centrifugation;

[0037] 2) Add cobalt acetate and 2-methylimidazole respectively into a 100mL beaker, add 15mL deionized water, and stir evenly to obtain cobalt acetate solution with a concentration of 0.11mol / L and 2-methylimidazole with a concentration of 1.11mol / L, respectively. Imidazole solution; first add 2-methylimidazole solution to the precipitate I obtained in step 1), stir at room temperature for 1 h, then transfer the mixture to a centrifuge tube, and collect the precipitate II at the bottom by centrifugation; then add the cobalt acetate solution Add to the precipitate II, stir at room temperature fo...

Embodiment 3

[0042] A kind of graphene supported Co-N-C oxygen reduction catalyst, its preparation method comprises the following steps:

[0043] 1) Add 0.5 g of graphene oxide into a single-necked flask, and add 60 mL of deionized water, stir and react at room temperature for 2 h, then transfer the resulting mixture to a centrifuge tube, and collect the bottom precipitate I by centrifugation;

[0044]2) Add cobalt acetate and 2-methylimidazole into a 100mL beaker respectively, add 15mL deionized water, stir and dissolve to obtain cobalt acetate solution with a concentration of 0.11mol / L and 2-methylimidazole with a concentration of 1.11mol / L Imidazole solution; first add 2-methylimidazole solution to the precipitate I obtained in step 1), stir at room temperature for 1 h, then transfer the mixture to a centrifuge tube, and collect the precipitate II at the bottom by centrifugation; then add the cobalt acetate solution Add to the precipitate II, stir at room temperature for 1 h, transfer t...

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Abstract

The invention discloses a graphene loaded Co-N-C oxygen reduction catalyst and a preparation method thereof. Electrostatic self-assembly is adopted to anchor ZIF-67 on the surface of graphene and then high temperature carbonization is carried out to prepare the oxygen reduction catalyst. The method comprises the following specific steps: 1. adding oxidized graphene to water, stirring at room temperature, and centrifuging to collect obtained precipitate I; 2. adding a 2-methylimidazole solution to the obtained precipitate I, stirring at room temperature, and centrifuging to collect a precipitate II; then adding a cobaltous acetate solution to the precipitate II, stirring at room temperature, and centrifuging to collect a precipitate III; 3. repeating step 2 for 2-10 times and then drying; 4. carrying out constant temperature carbonization treatment on the dried product at the atmosphere of inert gas. The nano-structure graphene prepared according to the invention has good stability and conductivity, can form a cobalt-carbon-nitrogen catalytic active center with ZIF-67, is favorable for quick transfer of electrons, can enhance the catalytic capacity of the obtained catalyst for oxygen, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a graphene-supported Co-N-C oxygen reduction catalyst and a preparation method thereof. Background technique [0002] Fuel cell (FuelCell) is a type of primary battery, which is a power generation device that directly converts the chemical energy in externally supplied fuel and oxidant into electrical energy, heat energy and other reaction products through electrochemical reactions, and its energy conversion efficiency is as high as 60%. -80%. Fuel cells are very complex, involving relevant theories of chemical thermodynamics, electrochemistry, electrocatalysis, material science, power systems and automatic control, etc., and have the advantages of high power generation efficiency, low environmental pollution, and low noise. A proton exchange membrane fuel cell (protonexchangemembranefuelcell, PEMFC) is a fuel cell that uses a proton exchange membrane as an electr...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 唐浩林蔡世昌王锐曾燕魏希
Owner WUHAN UNIV OF TECH
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