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Preparation method and application of iron doped cobalt diselenide compound nitrogen doped carbon material

A technology of cobalt diselenide and nitrogen-doped carbon, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of high cost and scarcity, limit large-scale application, etc., to improve utilization efficiency, facilitate industrial operation, The effect of a simple synthesis process

Active Publication Date: 2018-08-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The development of efficient catalysts for hydrogen production by electrolysis of water is crucial to improving the efficiency of energy utilization in the process of hydrogen production by electrolysis of water. So far, the most efficient catalyst for hydrogen production is the noble metal platinum, but its high cost and scarcity limit its use in electrolysis of water. Large-Scale Applications in Hydrogen Reactions

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  • Preparation method and application of iron doped cobalt diselenide compound nitrogen doped carbon material
  • Preparation method and application of iron doped cobalt diselenide compound nitrogen doped carbon material
  • Preparation method and application of iron doped cobalt diselenide compound nitrogen doped carbon material

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Embodiment 1

[0031] The carbon fiber paper with a geometric area of ​​2 square centimeters was ultrasonically cleaned with dediluted hydrochloric acid, ethanol, and deionized water for 30 minutes in order to remove impurities such as metal ions and organic substances on the surface. Place in an oven, dry at 50°C for 12 hours, and set aside.

Embodiment 2

[0033] First, ZIF-67 was prepared by solution precipitation method. 8 mmol 2-methylimidazole and 2 mmol cobalt nitrate hexahydrate were dissolved in 50 ml methanol solution to obtain a clear solution, and then the two solutions were mixed and stirred at room temperature for 24 hours. Subsequently, the reaction product is centrifuged, washed, and dried to obtain solid purple powder ZIF-67, and the morphology picture of ZIF-67 is as follows: figure 1 As shown, it presents a standard rhombic dodecahedron structure. Take 40mg ZIF-67 powder and evenly disperse it in 20ml ethanol solution, add 5ml ferric nitrate ethanol solution (2mg / ml), stir and react for two hours at room temperature, ZIF-67 3+ The etching action of hydrogen ions generated by hydrolysis releases Co 2+ , with the consumption of hydrogen protons, Fe 3+ and Co 2+ Co-precipitate on ZIF-67 particles to obtain iron-modified Fe-ZIF-67, then centrifuge, wash and dry the reaction product to obtain purple solid powder F...

Embodiment 3

[0035] The prepared above-mentioned Fe-CoSe 2 @NC powder material is mixed with conductive carbon black and polyvinylidene fluoride at a mass ratio of 5:4:1, mixed with ethanol to make a slurry and brushed on CFP to make Fe-CoSe 2 @NC / CFP electrode, dried at 50°C for 12 hours. CoSe 2 @NC electrode material is loaded on CFP according to the same ratio and brushing method to prepare CoSe 2 @NC / CFP electrodes. Among them, Fe-CoSe 2 @NC and CoSe 2 The load of @NC active ingredient on CFP is 0.5mg / cm 2 .

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Abstract

The invention discloses a preparation method and application of an iron doped cobalt diselenide compound nitrogen doped carbon material. The method is characterized in that a metal organic framework ZIF-67 is used as the precursor, ferric ion is utilized to perform etching to obtain iron modified Fe-ZIF-67, selenium steam is used to perform carbonization and selenylation on the Fe-ZIF-67 to obtaina nitrogen doped porous carbon loaded iron doped cobalt diselenide (Fe-CoSe2@NC) powdered electrode material. The Fe-CoSe2@NC is prepared into slurry, and conductive carbon fiber paper is coated withthe slurry to obtain a Fe-CoSe2@NC / CFP electrode. The electrochemical catalysis hydrogen production performance indexes of the Fe-CoSe2@NC / CFP electrode include: the Tafel slope is 40.9mV / decade; overpotential for reach the current density of 10mA / cm<2> is -0.143V(vs RHE). Meanwhile, the assembled electrode is excellent in electrochemical stability and does not have evident voltage fluctuation ina 48-hour constant-current stability test. The synthesizing method of the compound electrode is simple, efficiency, green, environmentally friendly, low in raw material and synthesizing costs, suitable for industrial application using electrochemical water decomposition to produce hydrogen and extensive in scientific significance.

Description

technical field [0001] The invention relates to an electrocatalytic water splitting composite electrode, in particular to a preparation method and application of a high-efficiency electrocatalytic splitting water hydrogen production composite electrode, which belongs to the field of electrolytic water hydrogen production. Background technique [0002] With the increasing consumption of fossil energy such as coal and oil in the world, serious environmental pollution and future energy crisis are problems that human beings must face. It is imminent to develop efficient, renewable and clean energy, such as solar energy, wind energy, water energy, biomass energy and the derived electric energy, and increase its proportion in the entire energy structure. Among the many new energy sources, how to realize the storage and continuous supply of new energy is a very critical issue, among which converting it into chemical energy is a main way, such as electrolysis of water to produce hyd...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06
CPCC25B1/04C25B11/091Y02E60/36
Inventor 张兴旺吴晓琳刘伟郑国奎雷乐成
Owner ZHEJIANG UNIV
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