Double-functional catalyst of carbon-based non-noble-metal oxygen electrode and preparation method thereof

A bifunctional catalyst, non-precious metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. The problems of poor acceptability and long-term operation stability, low catalytic activity, etc., achieve the effect of easy purchase and preparation, promotion of catalytic performance, and large surface area.

CN102513109AInactive Publication Date: 2012-06-27WUHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-06-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a double-functional catalyst of carbon-based non-noble-metal oxygen electrode and a preparation method thereof. The catalyst is a composite material composed of metal, metal oxide grains, N-doped graphene, carbon spheres and nanotubes. The preparation method of the catalyst comprises the following steps of: 1) weighing graphite oxide or graphene oxide, the carbon spheres, a metal compound and a nitrogen-containing heterocyclic compound according to ratios; carrying out ultrasonic treatment on the raw materials in a solvent; uniformly agitating and sufficiently drying to obtain a precursor; and 2) carrying out high-temperature pyrolysis in a precursor inert atmosphere to obtain a composite material catalyst. The catalyst provided by the invention not only has the advantages of high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic performances, good stability and excellent CH3OH / CO tolerance, but also the cost of the raw materials is low, and the preparation method is simple and is easy to operate.
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Description

technical field

[0001] The invention belongs to the field of catalysts for power devices such as fuel cells and electrolyzed water, and in particular relates to a non-precious metal catalyst and a preparation method thereof. Background technique

[0002] Proton exchange membrane fuel cells, methanol fuel cells, electrolyzed water devices and integrated renewable fuel cells are considered to be high-energy, high-power, and pollution-free power supply devices to solve future energy problems. In the development of technology, catalysts, especially oxygen electrode catalysts, have become one of the main bottlenecks to curb their commercialization. Considering the activity and stability of catalysts, Pt and its alloy catalysts in proton exchange membrane fuel cells and methanol fuel cells are currently used for oxygen reduction reaction (ORR), and IrO2 in water electrolysis devices. 2 / RuO 2 Used for oxygen evolution reaction (OER), Pt and its alloy catalysts in integrated rene...

Examples

Embodiment 1

[0036] 1) Preparation of Fe-containing non-noble metal catalysts

[0037] Weigh the two substances according to the mass ratio of graphene oxide to vulcan XC-72 carbon black 3:1, and weigh FeSO with the mass ratio of vulcan XC-72 carbon black 2:5 4 .7H 2 O, weigh the nitrogen-containing heterocyclic compound at a mass ratio of 80:1 to vulcan XC-72 carbon black, disperse the above-mentioned substance in solvent water (add a small amount of ethanol to promote dispersion), and vigorously sonicate until it is evenly stirred, and then spin evaporate at 60 °C Dry to obtain a gray-brown powder precursor, put the precursor in a tube furnace under the protection of high-purity Ar inert gas, and pyrolyze it at 900 °C for 1 h to obtain a black Fe- and FeO-containing x Non-precious metal catalysts.

[0038] 2) Test the catalytic performance of Fe-containing non-noble metal catalysts

[0039]An appropriate amount of catalyst powder was uniformly dispersed in Nafion's isopropanol solutio...

Embodiment 2

[0049] 1) Preparation of Fe-containing non-noble metal catalyst with GO (graphene oxide) / C ratio of 4:1

[0050] Weigh the two substances according to the mass ratio of graphene oxide and vulcan XC-72 carbon black 4:1, and weigh FeSO with the mass ratio of vulcan XC-72 carbon black 2:5 4 .7H 2 O, weigh the nitrogen-containing heterocyclic compound at a mass ratio of 80:1 to vulcan XC-72 carbon black, disperse the above-mentioned substance in solvent water (add a small amount of ethanol to promote dispersion), and vigorously sonicate until it is evenly stirred, and then spin evaporate at 60 °C Dry to obtain the gray-brown powdery precursor, put the precursor in a tube furnace under the protection of high-purity Ar inert gas, and pyrolyze it at 900 °C for 1 h to obtain black Fe or FeO x Non-precious metal catalysts.

[0051] 2) Test the catalytic performance of non-precious metal catalysts

[0052] An appropriate amount of catalyst powder was uniformly dispersed in Nafion's i...

Embodiment 3

[0056] 1) Preparation of GO / C 3:2 Fe-containing non-noble metal catalyst

[0057] Weigh the two substances according to the mass ratio of graphene oxide and vulcan XC-72 carbon black 3:2, and weigh FeSO with the mass ratio of vulcan XC-72 carbon black 2:5 4 .7H 2 O, weigh the nitrogen-containing heterocyclic compound at a mass ratio of 80:1 to vulcan XC-72 carbon black, disperse the above-mentioned substance in solvent water (add a small amount of ethanol to promote dispersion), and vigorously sonicate until it is evenly stirred, and then spin evaporate at 60 °C Dry to obtain the gray-brown powdery precursor, put the precursor in a tube furnace under the protection of high-purity Ar inert gas, and pyrolyze it at 900 °C for 1 h to obtain black Fe or FeO x Non-precious metal catalysts.

[0058] 2) Test the catalytic performance of non-precious metal catalysts

[0059] An appropriate amount of catalyst powder was uniformly dispersed in Nafion's isopropanol solution, and the ca...