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Oxygen reduction electrocatalyst and preparation thereof

An electrocatalyst and carbon black technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of increasing fuel cell manufacturing costs, hindering commercial production, Complicated synthesis process and other issues, to achieve the effects of shortening the preparation time, strong controllability of the preparation process, and simplifying the reaction process route

Inactive Publication Date: 2008-09-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned oxygen reduction electrocatalysts (metal porphyrins and metal phthalocyanines) are generally transition metal macrocyclic compounds containing macrocyclic structures, such as transition metal porphyrin monomers, transition metal substituted porphyrins, transition metal phthalocyanines, transition metal porphyrins, and transition metal porphyrins. Metal-substituted phthalocyanine or transition metal polymerized phthalocyanine has many preparation steps, complicated synthesis process, many side reactions, low yield, and high cost of raw materials for synthesizing macrocyclic ligands, which will greatly increase the manufacturing cost of fuel cells. hinder its commercial production

Method used

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  • Oxygen reduction electrocatalyst and preparation thereof
  • Oxygen reduction electrocatalyst and preparation thereof
  • Oxygen reduction electrocatalyst and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] At 0°C, add 40g of absolute ethanol and 0.0806g of cobalt chloride into a 100mL flask. After the cobalt chloride is completely dissolved, add 0.25g of triethylenetetramine dropwise under stirring, continue stirring for 10 minutes, and add 0.1g of carbon black carrier Vulcan XC-72R, continued to stir for 2 hours, evaporated to remove absolute ethanol, heat-treated at 800°C for 90 minutes under the protection of inert gas Ar, and then cooled to obtain an oxygen reduction electrocatalyst carbon-supported cobalt triethylenetetramine.

[0027] figure 1 It is the carbon-supported cobalt triethylenetetramine of the oxygen reduction electrocatalyst that embodiment 1 obtains in oxygen-saturated 0.5MH 2 SO 4 The cyclic voltammetry curve in the solution, the scanning speed is 50mV / s, there is a very obvious characteristic peak of oxygen reduction in the figure, the peak potential is 0.415V (vs.NHE), and the peak current is 13.05mA / cm 2 , indicating that the catalyst of the prese...

Embodiment 2

[0031]At 25°C, add 8g of absolute ethanol and 0.0403g of cobalt chloride into a 100mL flask. After the cobalt chloride is completely dissolved, add 0.1g of triethylenetetramine dropwise under stirring, continue stirring for 30 minutes, and add 0.1g of carbon black carrier Ketjen Black, continued to stir for 240 minutes, evaporated to remove absolute ethanol, protected by inert gas Ar and heat-treated at 800°C for 120 minutes at a high temperature, and cooled to obtain an oxygen reduction electrocatalyst with carbon-supported cobalt triethylenetetramine.

[0032] Figure 4 It is the carbon-supported cobalt triethylenetetramine of the oxygen reduction electrocatalyst that embodiment 2 obtains in oxygen-saturated 0.5MH 2 SO 4 The electrochemical cyclic voltammetry test was carried out in the solution, and the scanning speed was 50mV / s. It was found that the characteristic peak of oxygen reduction was obvious, and the peak potential was the highest at 0.6745V (vs. NHE), but the p...

Embodiment 3

[0034] At 50°C, add 80g of absolute ethanol and 0.0844g of cobalt acetate into a 100mL flask. After the cobalt acetate is completely dissolved, add 0.2 g of triethylenetetramine dropwise under stirring, continue stirring for 30 minutes, add 0.2 g of carbon black carrier Black Pearl 2000, and continue stirring for 240 minutes. Evaporation removes absolute ethanol, heats at 800°C for 60 minutes under the protection of inert gas Ar, and cools to obtain a carbon-supported cobalt triethylenetetramine as an oxygen reduction electrocatalyst.

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Abstract

The invention discloses an oxygen reduction electrocatalyst and a preparation method thereof, which is a load type catalyst and consists of a transition metal triethylene tetramine chelate complex and a carbon black carrier; wherein, the transition metal triethylene tetramine chelate complex is obtained by the reaction of transition metal-salt and triethylene tetramine. The oxygen reduction electrocatalyst of the invention uses the triethylene tetramine having simple structure and low cost, which overcomes the defects of traditionally used macrocyclic compound porphyrin and Phthalocyanine and derivatives thereof and has simple preparation technique, low cost, friendly environment and a better catalytic activity; a oxygen reduction peak potential is 0.6745 (vs. NHE) and a oxygen reduction peak current is 1.493mA / m<2>; stability is relatively high, and oxygen reduction catalytic performance is not obviously reduced after recycling for 24 hours. The oxygen reduction electrocatalyst of the invention can be applied to the fields of proton exchange membrane fuel batteries, direct alcohol fuel cells, and cathode materials of metal-air battery, etc.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to an oxygen reduction electrocatalyst and a preparation method thereof. Background technique [0002] With the sharp increase in the consumption of fossil fuels (coal, oil and natural gas) and the depletion of energy resource reserves, as well as a series of environmental and pollution problems, it is urgent to find environmentally friendly and sustainable energy technologies. As a new type of energy conversion device, the proton exchange membrane fuel cell uses hydrogen and oxygen to react to generate water, and releases heat and electricity at the same time. It has the advantages of low working temperature, no pollution, high specific power and fast start-up. hotspot. However, the cathode oxygen reduction reaction of the proton exchange membrane fuel cell is slow and the overpotential is high. Even if platinum or platinum alloy oxygen reduction electrocatalyst is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22H01M4/90
CPCY02E60/50
Inventor 张慧娟马紫峰
Owner SHANGHAI JIAO TONG UNIV
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