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Method for preparing iron-cobalt bimetallic monatomic anchored nitrogen-doped graphene cocatalyst and application thereof

A cocatalyst and bimetallic technology, which is applied in the field of preparing iron-cobalt bimetallic single-atom-anchored azagraphene cocatalysts, can solve the problems of lack of platinum group metal reserves, high cost, and restricting the industrial application of platinum group metals, etc. Effects of fast photogenerated electron-hole separation and transport efficiency, low cost, and excellent photocatalytic hydrogen production performance

Pending Publication Date: 2022-02-08
WETOWN ELECTRIC GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the most effective co-catalysts are platinum group metals. However, platinum group metals are scarce in nature, and their high cost limits the industrial application of platinum group metals.

Method used

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  • Method for preparing iron-cobalt bimetallic monatomic anchored nitrogen-doped graphene cocatalyst and application thereof
  • Method for preparing iron-cobalt bimetallic monatomic anchored nitrogen-doped graphene cocatalyst and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1, weigh 100 mg of graphene oxide and add it to 50 mL of deionized water, mix evenly by ultrasonic, add dropwise 0.8 mL of 3 mg / mL cobalt chloride aqueous solution and 0.2 mL of 3 mg / mL ferric chloride aqueous solution, and ultrasonically make it in Uniformly disperse in the mixed solution to obtain solution A (the volume ratio of cobalt chloride aqueous solution and ferric chloride aqueous solution is 4:1);

[0024] Step 2, after the solution A was quickly frozen with liquid nitrogen, freeze-drying was performed for 48 h;

[0025] Step 3, put the sample into an atmosphere of ammonia and argon for calcination at 750 °C for 1 h, the flow rate of argon gas is 170 mL / min, the flow rate of ammonia gas is 70 mL / min, and the heating rate is 12 °C / min, to obtain iron Cobalt bimetallic single-atom-anchored azagraphene, denoted as Fe 0.2 co 0.8 -NG spare;

[0026] Step 4, weigh 5 mg Fe 0.2 co 0.8 -NG, added to 30 mL absolute ethanol, sonicated evenly, added 100 mgmpg-C...

Embodiment 2

[0028] Step 1, weigh 100 mg of graphene oxide and add it to 50 mL of deionized water, and mix evenly by ultrasonic, add dropwise 0.5 mL of 3 mg / mL cobalt chloride aqueous solution and 0.5 mL of 3 mg / mL ferric chloride aqueous solution, and ultrasonically mix Uniformly disperse in the solution to obtain solution A (the volume ratio of cobalt chloride aqueous solution and ferric chloride aqueous solution is 1:1);

[0029] Step 2, after the solution A was quickly frozen with liquid nitrogen, freeze-drying was performed for 48 h;

[0030] Step 3, put the sample into an atmosphere of ammonia and argon for calcination at 750 °C for 1 h, the flow rate of argon gas is 170 mL / min, the flow rate of ammonia gas is 70 mL / min, and the heating rate is 12 °C / min, to obtain iron Cobalt bimetallic single-atom-anchored azagraphene, denoted as Fe 0.5 co 0.5 -NG spare;

[0031] Step 4, weigh 5 mg Fe 0.5 co 0.5 -NG, added to 30 mL absolute ethanol, sonicated evenly, added 100 mgmpg-C 3 N 4 ...

Embodiment 3

[0033] Step 1, weigh 100 mg of graphene oxide and add it to 50 mL of deionized water, ultrasonically mix evenly, add dropwise 0.2 mL of 3 mg / mL cobalt chloride aqueous solution and 0.8 mL of 3 mg / mL ferric chloride aqueous solution, and ultrasonically make it in Uniformly disperse in the mixed solution to obtain solution A (the volume ratio of cobalt chloride aqueous solution and ferric chloride aqueous solution is 1:4);

[0034] Step 2, after the solution A was quickly frozen with liquid nitrogen, freeze-drying was performed for 48 h;

[0035] Step 3, put the sample into an atmosphere of ammonia and argon for calcination at 750 °C for 1 h, the flow rate of argon gas is 170 mL / min, the flow rate of ammonia gas is 70 mL / min, and the heating rate is 12 °C / min, to obtain iron Cobalt bimetallic single-atom-anchored azagraphene, denoted as Fe 0.8 co 0.2 -NG spare;

[0036] Step 4, weigh 5 mg Fe 0.8 co 0.2 -NG, added to 30 mL absolute ethanol, sonicated evenly, added 100 mgmpg-...

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Abstract

The invention relates to a method for preparing an iron-cobalt bimetallic monatomic anchored nitrogen-doped graphene cocatalyst and application thereof. The method comprises the following steps: adding graphene oxide into deionized water, ultrasonically mixing uniformly, adding a mixed solution of a cobalt chloride aqueous solution and a ferric chloride aqueous solution, and ultrasonically dispersing the graphene oxide in the mixed solution uniformly to obtain a solution A; putting the solution A into liquid nitrogen to be quickly frozen, performing freeze drying treatment, and performing high-temperature calcination in argon and ammonia gas atmospheres to obtain iron-cobalt bimetallic monatomic anchored nitrogen-doped graphene which is used as a cocatalyst; adding a loading material into an absolute ethyl alcohol solution for ultrasonic dispersion, compounding with the iron-cobalt bimetallic monatomic anchored nitrogen-doped graphene, mechanically stirring the mixture at room temperature, centrifuging, washing, drying in vacuum, grinding, and annealing to obtain the composite photocatalytic material. Iron-cobalt bimetallic single atoms are uniformly anchored on the surface of the nitrogen-doped graphene, and the nitrogen-doped graphene is well combined with different mesoporous semiconductor materials, so that the nitrogen-doped graphene has excellent photocatalytic hydrogen production performance.

Description

technical field [0001] The invention belongs to the technical field of energy and material preparation, and in particular relates to a method for preparing an iron-cobalt bimetal single-atom-anchored aza-graphene cocatalyst and its application. Background technique [0002] Since the 21st century, countries around the world have continuously accelerated their development pace. Huge energy consumption and severe environmental pollution have seriously affected the sustainable development of human beings. Therefore, it is particularly necessary to develop efficient, green and sustainable new energy sources. Solar energy is abundant and widely distributed, and is regarded as an ideal renewable energy source. Photocatalytic technology is an efficient, safe and green technology with broad application prospects for converting solar energy into chemical energy. The disadvantages such as high cost have limited the wide application of photocatalytic technology. Therefore, the develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J27/24B01J35/00C01B3/04
CPCB01J27/24B01J23/75C01B3/042B01J35/39Y02E60/36
Inventor 蒋文功周忠蔡兴民孙培亚郭晨刘津媛鲍庆宝
Owner WETOWN ELECTRIC GRP CO LTD
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