A kind of preparation method of carbon supported nano-silver catalyst

A nano-silver and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of undeveloped catalysts, achieve excellent ORR performance, low price, and wide-ranging sources

Active Publication Date: 2020-11-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, although metal nanoparticles / C catalysts have made great progress in many aspects, there is still no catalyst developed that can replace Pt / C (20wt%)

Method used

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  • A kind of preparation method of carbon supported nano-silver catalyst
  • A kind of preparation method of carbon supported nano-silver catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 70.2 mg (0.2 mmol) of tris(tetraaminophenyl) benzene and 35 mL of dichloromethane into a 100 mL round bottom flask, stir magnetically at room temperature until completely dissolved; weigh 102 mg (0.6 mmol) of AgNO 3 The solid was dissolved in 10 mL of dichloromethane, and was added dropwise to the above-mentioned round bottom flask at a uniform speed; after the dropwise addition was completed, the reaction was stirred at room temperature for 12 hours, and the precipitate was obtained by centrifugation. The obtained precipitate was vacuum-dried in a constant-temperature oven at 60° C. for 12 hours to obtain a polymer metal complex.

[0030] Put 0.2g of the polymer metal complex obtained in the above steps in a muffle furnace, and in an Ar gas atmosphere, heat up to 850°C at a rate of 5°C / min for calcination for 120min, and cool naturally to room temperature to obtain an Ag loading of 1eq carbon-supported silver nanocatalysts. (Initial potential: 0.92V; half-wave pot...

Embodiment 2

[0032] Add 70.2mg (0.2mmol) of tris(tetraaminophenyl)benzene and 35mL of dichloromethane into a 100mL round bottom flask, stir magnetically at room temperature until completely dissolved; weigh 153mg (0.9mmol) of AgNO 3 The solid was dissolved in 18 mL of dichloromethane, and was added dropwise to the above-mentioned round bottom flask at a uniform speed; after the dropwise addition was completed, the reaction was stirred at room temperature for 12 hours, and the precipitate was obtained by centrifugation. The obtained precipitate was vacuum-dried in a constant-temperature oven at 60° C. for 12 hours to obtain a polymer metal complex.

[0033] Put 0.2 g of the polymer metal complex obtained in the above steps in a muffle furnace, and in an Ar gas atmosphere, heat up to 850 °C for 120 min at a heating rate of 5 °C / min, and then cool naturally to room temperature to obtain an Ag loading of 1.5 eq's carbon-supported nanosilver catalyst. (Initial potential: 0.93V; half-wave poten...

Embodiment 3

[0035] Add 58mg (0.2mmol) of tris(tetraaminophenyl)amine and 29mL of chloroform into a 100mL round bottom flask, stir magnetically at room temperature until completely dissolved; weigh 102mg (0.6mmol) of AgNO 3 The solid was dissolved in 10 mL of chloroform, and was added dropwise to the above-mentioned round bottom flask at a uniform speed; after the dropwise addition was completed, the reaction was stirred at room temperature for 12 hours, and the precipitate was obtained by centrifugation. The obtained precipitate was vacuum-dried in a constant-temperature oven at 60° C. for 12 hours to obtain a polymer metal complex.

[0036] Put 0.2g of the polymer metal complex obtained in the above steps in a muffle furnace, and in an Ar gas atmosphere, heat up to 850°C at a rate of 5°C / min for calcination for 120min, and cool naturally to room temperature to obtain an Ag loading of leq carbon-supported silver nanocatalysts. (Initial potential: 0.91V; half-wave potential: 0.70V)

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Abstract

A preparation method for a carbon-supported nano-silver catalyst, comprising: using a -NH2 functional group-containing compound and AgNO3 as raw materials, synthesizing a high molecular metal complex by means of a coordination reaction, then calcining the high molecular metal complex at a high temperature, and then performing other post-treatments, so as to prepare a carbon-supported nano-silver catalyst which can be used for ORR. The catalyst uses a wide range of raw materials, and has low price and simple experimental operation. The active site Ag nanoparticles thereof are uniformly distributed. The catalyst exhibits excellent ORR performance, has universality, and can be prepared by using different NH2 functional group-containing compounds and solvents.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis and electrochemistry, and in particular relates to a preparation method of a carbon-loaded nano-silver catalyst. Background technique [0002] Energy is the basis for the survival and development of human beings. With the continuous development of society, energy consumption is excessive, and various non-renewable resources are on the verge of exhaustion. The energy crisis that people are facing is becoming more and more serious, and it is urgent to find new alternative energy sources. As an efficient and clean energy device, fuel cells have attracted extensive attention from researchers. However, the kinetics of the oxygen reduction reaction at the cathode of the fuel cell is sluggish, 6 orders of magnitude slower than the hydrogen oxidation reaction at the anode, which greatly hinders the commercial development of fuel cells. Therefore, it is of great importance to develop efficient c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/00B01J37/08
CPCB01J23/50B01J35/0033B01J35/006B01J35/0093B01J37/084B01J37/086
Inventor 戴李宗刘玲李云同吴俣哲曾碧榕陈国荣许一婷
Owner XIAMEN UNIV
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