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Preparation method of ZIF-67 carbide-loaded nano CeO2 oxygen reduction catalyst

A technology of ZIF-67 and catalyst, applied in the field of fuel cell electrocatalysis, can solve the problems of high cost, low efficiency and slow speed

Inactive Publication Date: 2019-07-26
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The development of environmentally friendly, renewable and efficient energy technologies has become the most important research focus nowadays; Direct Methanol Fuel Cell (DMFC) is an energy conversion technology that directly converts chemical energy into electrical energy; due to DMFC has the advantages of low pollution, high energy density and fast start-up speed, and is expected to be applied in the field of portable energy; at present, one of its main technical obstacles is the slow rate of cathode oxygen reduction reaction (ORR) and the need for a large amount of platinum. Pt-based catalysts; while Pt-based catalysts are usually prone to poisoning, low efficiency and high cost, these shortcomings limit the commercialization of DMFC; therefore, it is necessary to develop non-noble metals with high ORR catalytic activity, excellent anti-poisoning performance and good stability catalyst

Method used

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  • Preparation method of ZIF-67 carbide-loaded nano CeO2 oxygen reduction catalyst
  • Preparation method of ZIF-67 carbide-loaded nano CeO2 oxygen reduction catalyst
  • Preparation method of ZIF-67 carbide-loaded nano CeO2 oxygen reduction catalyst

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Embodiment approach 1

[0028] In this implementation method Co 3 o 4 @Z67-T @CeO 2 The preparation method of the nano electrocatalyst is as follows: 1. A certain amount of Co(NO 3 ) 2 ·6H 2O and 2-methylimidazole were respectively dissolved in 25mL of methanol, stirred, sonicated, left standing, centrifuged, washed, and dried to obtain the ZIF-67 polyhedral material (purple); 2. Place the dried ZIF-67 obtained in step 1 After high-temperature carbonization in a nitrogen atmosphere tube furnace and keeping at the highest temperature for 2 hours, Co 3 o 4 @Z67-T powdery substance (black); 3. Ultrasonically disperse the black powder in step 2 in 10mL ethylene glycol, pour an appropriate amount of Ce(NO 3 ) 3 ·6H 2 O aqueous solution, and stir rapidly to form a uniform mixed solution; 4. Pour the mixed solution in step 3 into a polytetrafluoroethylene high-pressure reactor, and after a hydrothermal reaction at 160°C for 16 hours, suction filter, wash, and dry to obtain the final Product Co 3 o...

Embodiment approach 2

[0029] Specific implementation method two: the difference between this implementation method and the specific implementation method one is: m(Co 3 o 4 @Z67-T): m(Ce(NO 3 ) 3 ·6H 2 O=1.0:0.4, others are the same as the specific implementation method 1.

Embodiment approach 3

[0030] Specific implementation method three: the difference between this implementation method and specific implementation method one is: m(Co 3 o 4 @Z67-T): m(Ce(NO 3 ) 3 ·6H 2 O=1.0:0.6, others are the same as the specific implementation method 1.

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Abstract

The invention provides a preparation method of a ZIF-67 carbide-loaded nano CeO2 oxygen reduction catalyst; the catalyst is used as an oxygen reduction reaction (ORR) catalyst of a fuel cell cathode.A common platinum-based ORR catalyst has the defects of high cost, poor stability and the like, so that it is necessary to develop the non-noble metal catalyst with relatively high ORR catalytic activity, excellent anti-poisoning performance and high stability. In recent years, metal organic framework derived materials have become one of hotspots in the field of electrocatalysis, and in order to obtain higher ORR electrocatalytic activity, the conductivity can be enhanced, the active sites can be increased, or certain synergistic effects can be generated by modifying derivative materials, so that the better ORR catalytic performance can be obtained. According to the method, ZIF-67 carbide (Co3O4@Z67-T) prepared at different carbonization temperatures and CeO2 nanoparticles are compounded to obtain a Co3O4@Z67-T@CeO2 nano electrocatalyst with a core-shell structure, wherein the electrolyte shows excellent electrocatalytic performance; and the Co3O4@Z67-T@CeO2 catalyst has the potentialof the ORR catalyst being practically applied to the fuel cell cathode.

Description

technical field [0001] The invention relates to the technical field of fuel cell electrocatalysis, in particular to a ZIF-67 carbide supported nanometer CeO 2 The preparation method of the oxygen reduction catalyst, and it is used as the oxygen reduction reaction (ORR) catalyst of fuel cell cathode. Background technique [0002] The development of environmentally friendly, renewable and efficient energy technologies has become the most important research hotspot nowadays; direct methanol fuel cell (Direct Methanol Fuel Cell, DMFC) is an energy conversion technology that directly converts chemical energy into electrical energy; due to DMFC has the advantages of low pollution, high energy density and fast start-up speed, and is expected to be applied in the field of portable energy; at present, one of its main technical obstacles is the slow rate of cathode oxygen reduction reaction (Oxygen Reduction Reaction, ORR), and requires a large amount of platinum Pt-based catalysts; ...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9016H01M4/9083Y02E60/50
Inventor 邹金龙李雪瑞蔡庄
Owner HEILONGJIANG UNIV
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