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Composite hydrogen evolution electro-catalysis material and preparation method

An electrocatalytic material and a catalytic material technology, which are applied in the field of molybdenum disulfide-cobalt disulfide/graphene composite hydrogen evolution electrocatalytic material and preparation, can solve the problems of difficult preparation of MoP, complicated preparation process, low RGO yield, etc. Abundant reserves, speeding up the transmission rate, overcoming the effects of poor stability

Active Publication Date: 2018-04-06
JIANGSU UNIV
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Problems solved by technology

For example, Wu et al. used solvothermal reaction and further phosphating reaction to prepare MoP-RGO composite material, which has good hydrogen evolution activity, but the second step phosphating reaction requires a high temperature of 900 °C, which is too high The temperature is not conducive to saving energy, and the process of high temperature heating is easy to cause the agglomeration of RGO and the yield is small (Z. X. Wu, J. Wang, J. Zhu, J. Guo, W. P. Xiao, C. J. Xuan, W. Lei, D. Wang. Electrochimica Acta. 2017, 232, 254-261); Chen et al. prepared MoP hydrogen evolution catalyst by temperature-programmed reduction. Although this catalyst has good catalytic performance, its complicated preparation process and harsh experimental conditions make the MoP It is extremely difficult to prepare, and it is difficult to compound with carbon materials (X. B. Chen, D. Z. Wang, Z.P. Wang, P. Zhou, Z. Z. Wu, F. Jiang. 2014. 50. 11683-11685)

Method used

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Embodiment 1

[0022] Utilize the improved Hummers method to prepare graphene oxide; Weigh 24.2mg sodium molybdate dihydrate, 29.1mg cobalt nitrate hexahydrate, 30.4mg thiourea, 30mg graphene oxide and 30ml deionized water in a beaker, stir and sonicate to Uniform mixed solution; transfer the above mixed solution to a 40ml polytetrafluoroethylene-lined reactor, place it in an oven at 200°C, and react at a constant temperature for 18 hours; after the reaction, take out the reactor and cool it to room temperature; The product is centrifuged and washed 4-5 times with deionized water and ethanol (centrifugal speed 6000rmp, centrifugation time 1min), which obtains molybdenum disulfide-cobalt disulfide / graphene composite; finally the composite is washed once with deionized water; Place the molybdenum disulfide-cobalt disulfide / graphene composite after washing and centrifugation in the refrigerator, freeze and pretreat at -10°C for 2h, then place the pretreated sample in a freeze dryer at -45°C for ...

Embodiment 2

[0026] Utilize the improved Hummers method to prepare graphene oxide; Weigh 39.6mg sodium molybdate dihydrate, 45.2mg cobalt nitrate hexahydrate, 47.0mg thiourea and 55mg graphene oxide and 30ml deionized water in a beaker, stir, sonicate to Uniform mixed solution; transfer the above mixed solution to a 40ml polytetrafluoroethylene-lined reactor, place it in an oven at 200°C, and react at a constant temperature for 18 hours; after the reaction, take out the reactor and cool it to room temperature; The product is centrifuged and washed 4-5 times with deionized water and ethanol (centrifugal speed 6000rmp, centrifugation time 1min), which obtains molybdenum disulfide-cobalt disulfide / graphene composite; finally the composite is washed once with deionized water; Place the molybdenum disulfide-cobalt disulfide / graphene composite after washing and centrifugation in the refrigerator, freeze and pretreat at -10°C for 2h, then place the pretreated sample in a freeze dryer at -45°C for ...

Embodiment 3

[0030] Utilize improved Hummers method to prepare graphene oxide; Weigh 48.0mg sodium molybdate dihydrate, 58.0mg cobalt nitrate hexahydrate, 76.0mg thiourea and 60mg graphene oxide and 30ml deionized water in a beaker, stir, ultrasonic to a uniformly mixed solution; transfer the above mixed solution to a 40ml polytetrafluoroethylene-lined reactor, place it in an oven at 200°C, and react at a constant temperature for 18 hours; after the reaction, take out the reactor and cool it to room temperature; The product in the product is centrifuged and washed 4-5 times with deionized water and ethanol (centrifugal speed 6000rmp, centrifugation time 1min) to obtain molybdenum disulfide-cobalt disulfide / graphene composite; finally the composite is washed once with deionized water ; Place the molybdenum disulfide-cobalt disulfide / graphene composite after washing and centrifugation in a refrigerator, freeze and pretreat at -10°C for 2h, then place the pretreated sample in a freeze dryer at...

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Abstract

The invention relates to a molybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electro-catalysis material and a preparation method and belongs to the field of electro-catalysishydrogen evolution. The molybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electro-catalysis material is mainly prepared through the following steps that firstly, an advancedHummers method is adopted to prepare graphene oxide; then with sodium molybdate dihydrate, cobalt nitrate hexahydrate, thiourea, graphene oxide and deionized water as raw material, and through a one-step solvent thermal reaction method under 200 DEG C, the ternary molybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electro-catalysis material is prepared; and the electro-catalysis hydrogen evolution performance is analyzed. The preparation method has the beneficial effects of being easy to operate, low in energy consumption and the like; transition metal of cobalt and molybdenum for use is low in price, and it is hopeful that the material is applied in industrial production; and besides, a electro-catalysis hydrogen evolution performance test shows that the preparedmolybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electro-catalysis material is large in electronic transmission rate and good in hydrogen evolution performance.

Description

technical field [0001] The invention belongs to the field of hydrogen production by electrolysis of water, in particular to a molybdenum disulfide-cobalt disulfide / graphene composite hydrogen evolution electrocatalytic material and a preparation method. Background technique [0002] With the increasing energy crisis and environmental pollution, developing green energy and solving the problems of environmental pollution and energy crisis are the primary choices for maintaining sustainable development. The main energy source in my country is non-renewable fossil fuels, the energy structure is single and the carbon dioxide released during the burning of fossil fuels is also the culprit leading to the greenhouse effect. The current renewable energy mainly includes wind energy, solar energy, biomass energy, hydrogen energy and so on. Among them, hydrogen energy is a recognized ideal fuel, and its combustion value is three times that of petroleum. The most important thing is that...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/02
CPCC25B1/02C25B11/091
Inventor 谢吉民杨赛赛陈琳琳赵文通孙伟胡慧慧
Owner JIANGSU UNIV
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