Ag/GO/C catalyst and its preparation method and use

A catalyst and solvent technology, applied in the field of catalyst and its preparation, can solve the problems of long reaction time, high cost, large Ag loading, etc., and achieve the effects of simple and easy preparation process, favorable for environmental protection, and speeding up the industrialization process.

Active Publication Date: 2015-03-25
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

There are commercial Ag / C catalysts in the field of alkaline fuel cells, but their oxygen reduction overpotential is 50-100mv higher than that of Pt / C (J.Electrochem.Soc.152(2005)D117), although the research on Ag / C catalysts has achieved Great progress has been made, but the preparation of Ag / C catalysts with a particle size of less than 20nm and uniform dispersion is mostly carried out in the organic phase, and PVP (Chem.Mater.14 (2002) 4736), sodium citrate (J.Phys .Chem.C114 (2010) 4324) and other organic long-chain molecules are used as protective agents. These long-chain molecules cover the surface of Ag / C catalysts, greatly reducing their oxygen reduction activity (J.Power Sources196(2011) 3033)
[0004] Literature (Electrochem.Commun.28(2013) 100) adopts NaBH 4 As a reducing agent, a 60% Ag / RGO catalyst was prepared by reacting at 5 °C for 12 h. Although the prepared catalyst was only 12 nm, it had the disadvantages of large Ag loading, high cost, high energy consumption, and long reaction time. Poor quality, not suitable for ORR catalyst
Chinese patent CN102581297 discloses a method for the controllable green synthesis of metal nanomaterials based on graphene oxide. Neutral graphite oxide and silver nitrate are mixed and reacted for a long time at room temperature to prepare Ag / GO composite materials. The preparation time of this method is long , and the prepared material is not suitable for fuel cell catalysts due to the poor conductivity and mass transfer of GO

Method used

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  • Ag/GO/C catalyst and its preparation method and use
  • Ag/GO/C catalyst and its preparation method and use
  • Ag/GO/C catalyst and its preparation method and use

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Weigh 10mg of graphite oxide (GO), disperse in 20ml of deionized water, ultrasonically disperse for 1h; then add 31.5mg of AgNO 3 In the above GO solution, continue to sonicate for 1 h; weigh 15 mg NaOH, dissolve it in 15 ml deionized water, slowly drop the NaOH solution into the reaction solution under magnetic stirring; raise the temperature to 100 °C, and reflux for 2 h to obtain a brown-black colloid; weigh Take 70mg of Vulcan XC-72R carbon black and add it to 40ml of deionized water, sonicate for 30 minutes and pour it into the reaction solution; cool to room temperature, filter with suction, wash with 50ml of water, drain it and put it in the refrigerator to freeze overnight; take out the catalyst in the refrigerator Put it into a freeze dryer and dry it for 6h to get the target product Ag / GO / C catalyst. The mass content of Ag in the catalyst was 20%, and that of GO was 10%.

Embodiment 2

[0048] Weigh 10mg of graphite oxide (GO), disperse in 20ml of deionized water, ultrasonically disperse for 1h; then add 31.5mg of AgNO 3In the above GO solution, continue to sonicate for 30min; weigh 70mg VulcanXC-72R and add it to 40ml deionized water, after sonicating for 30min, pour GO and AgNO 3 In the solution, continue to sonicate for 30min; weigh 15mg NaOH, dissolve it in 15ml deionized water, slowly drop the NaOH solution into the reaction solution under magnetic stirring; raise the temperature to 100°C, reflux for 2h; cool to room temperature, filter with Wash with 50ml of water, drain and freeze overnight in the refrigerator; take out the catalyst in the refrigerator and put it in a freeze dryer to dry for 6 hours to obtain the target product Ag / GO / C catalyst. The mass content of Ag in the catalyst was 20%, and that of GO was 10%.

Embodiment 3

[0050] Weigh 20mg of graphite oxide (GO), disperse in 20ml of deionized water, ultrasonically disperse for 1h; then add 31.5mg of AgNO 3 In the above GO solution, continue to sonicate for 1h; weigh 15mg NaOH, dissolve it in 15ml deionized water, slowly drop the NaOH solution into the reaction solution under magnetic stirring; raise the temperature to 100°C, and reflux for 2h to obtain a brown-black colloid; weigh Take 60mg of Vulcan XC-72R carbon black and add it to 40ml of deionized water, sonicate for 30min and pour it into the reaction solution; cool to room temperature, filter with suction, wash with 50ml of water, drain it and put it in the refrigerator to freeze overnight; take out the catalyst in the refrigerator Put it into a freeze dryer and dry it for 6h to get the target product Ag / GO / C catalyst. The mass content of Ag in the catalyst was 20%, and that of GO was 20%.

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Abstract

The invention discloses an Ag / GO / C catalyst. Ag content of the Ag / GO / C catalyst is in a range of 5-90% by mass, and GO (graphite oxide) content of the Ag / GO / C catalyst is in a range of 5-90% by mass. The Ag / GO / C catalyst has high oxygen reduction reaction (ORR) catalytic activity under the alkaline conditions. The preparation method adopts a heating backflow technology, is simple and easy, can be implemented by one step, is conducive to catalyst large-scale production, is free of a process for producing RGO by high-temperature reduction or from large-toxicity hydrazine hydrate, greatly saves resources and energy, is safe, has no pollution and is conducive to environmental protection. The Ag / GO / C catalyst can be used as a metal-air fuel cell oxygen-reduction catalyst, an alkaline anion-exchange membrane fuel cell oxygen-reduction catalyst and other oxygen-reduction catalysts under alkaline conditions.

Description

technical field [0001] The invention belongs to the technical field of catalysts and their preparation, and in particular relates to an oxygen reduction catalyst used in metal-air fuel cells, alkaline anion-exchange membrane fuel cells and other alkaline conditions, as well as its preparation and application. Background technique [0002] Fuel cell is an environmentally friendly energy technology because of its advantages of high energy density, no pollution, no noise, etc., it has become a research hotspot in the world. Metal-air batteries have rich fuel supply, long storage life, and are easy to carry. The oxygen electrode can use non-precious metal oxygen reduction catalysts; and the alkaline anion exchange membrane fuel cell, compared with the proton exchange membrane fuel cell, does not have electrode leakage due to fuel penetration. Potential drop problem, also can use non-Pt oxygen reduction catalyst. [0003] In recent years, due to the advantages of high activity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50H01M4/90B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 孙公权袁丽只姜鲁华夏章讯
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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