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A vanadium diselenide-doped nickel-cobalt selenide yolk-shell structure micron cuboid counter electrode catalyst and its preparation method and application

An electrode catalyst, vanadium diselenide technology, applied in circuits, capacitors, photosensitive equipment, etc., can solve the problems of poor compromise, low reserves, high price, etc.

Active Publication Date: 2021-09-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the traditional catalyst for the counter electrode in DSSC, the noble metal Pt has good catalytic performance, but its major disadvantages such as low reserves, high price, and poor compromise severely hinder its large-scale application.

Method used

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  • A vanadium diselenide-doped nickel-cobalt selenide yolk-shell structure micron cuboid counter electrode catalyst and its preparation method and application
  • A vanadium diselenide-doped nickel-cobalt selenide yolk-shell structure micron cuboid counter electrode catalyst and its preparation method and application
  • A vanadium diselenide-doped nickel-cobalt selenide yolk-shell structure micron cuboid counter electrode catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 600 mg of cobalt acetate and 600 mg of nickel acetate in 70 mL of ethanol solution, and the resulting solution is solution A. Dissolve 2400 mg of polyvinylpyrrolidone in 120 mL of ethanol, and the resulting solution is solution B; slowly pour solution A into solution B, Stirring in a water bath at 80 °C for 1.5 h resulted in the precipitation of Ni-Co prism precursors. After centrifugal washing and drying, 140 mg of the obtained Ni-Co prism precursor was dispersed in 140 mL of ethanol, and then 140 mg of ammonium metavanadate was dispersed in 20 mL of deionized water, heated to dissolve; the aqueous solution was added dropwise to the ethanol solution , stirred in a water bath at 85 °C for 0.5 h, then centrifuged, washed and dried to obtain NiCo-VO x intermediate. NiCo-VO will be obtained x Take 80 mg and 80 mg of selenium powder as the intermediate, mix them evenly with a mortar, place them in a porcelain boat, heat them in a tube furnace to 300 °C, keep them...

Embodiment 2

[0032] Dissolve 600 mg of cobalt acetate and 1200 mg of nickel acetate in 80 mL of ethanol, and the resulting solution is solution A. Dissolve 3600 mg of polyvinylpyrrolidone in 280 mL of ethanol, and the resulting solution is solution B; Solution A was slowly poured into solution B, and stirred in a water bath at 100 °C for 2 h to obtain the precipitation of the Ni-Co prism precursor. After centrifugal washing and drying, 140 mg of the obtained Ni-Co prism precursor was dispersed in 140 mL of ethanol, and then 420 mg of ammonium metavanadate was dispersed in 28 mL of deionized water, heated and dissolved; the aqueous solution was added dropwise to the ethanol solution , stirred in a water bath at 100 °C for 2 h, then centrifuged, washed and dried to obtain NiCo-VO x intermediate. NiCo-VO will be obtained x Take 80 mg and 240 mg of selenium powder as the intermediate, mix them evenly with a mortar, place them in a porcelain boat, heat them in a tube furnace to 500 °C, keep t...

Embodiment 3

[0034] Dissolve 600 mg of cobalt acetate and 600 mg of nickel acetate in 75 mL of ethanol, and the resulting solution is solution A. Dissolve 3000 mg of polyvinylpyrrolidone in 200 mL of ethanol, and the resulting solution is solution B; Solution A was slowly poured into solution B, and stirred in a water bath at 85 °C for 4 h to obtain the precipitation of the Ni-Co prism precursor. After centrifugal washing and drying, 140 mg of the obtained Ni-Co prism precursor was dispersed in 140 mL of ethanol, and then 280 mg of ammonium metavanadate was dispersed in 24 mL of deionized water, heated and dissolved; the aqueous solution was added dropwise to the ethanol solution , stirred in a water bath at 90 °C for 4 h, then centrifuged, washed and dried to obtain NiCo-VO x intermediate. NiCo-VO will be obtained x The intermediate was mixed with 80 mg and 160 mg of selenium powder through a mortar, then placed in a porcelain boat, heated to 500 °C in a tube furnace, kept for 1 h, and ...

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Abstract

The invention discloses a vanadium diselenide-doped nickel-cobalt selenide yolk-shell structure micron cuboid counter electrode catalyst and a preparation method thereof. A mixed solution of cobalt acetate and nickel acetate is added to an ethanol solvent in which polyvinylpyrrolidone is dissolved, and the reaction is heated under water bath conditions to obtain precipitation of a Ni-Co prism precursor. Then react the precursor with ammonium metavanadate water bath to obtain the intermediate NiCo‑VO x , to realize the doping of vanadium heteroatoms; finally, the intermediate is further selenized at high temperature to obtain VSe with egg yolk-shell structure 2 ‑NiCoSe x catalyst. The method of the invention has mild and controllable operating conditions, short reaction time and low cost, and the prepared catalyst provides more active sites due to the synergistic effect of various metal ions and the doping of vanadium heteroatoms. At the same time, the prepared catalyst has high specific surface area, porosity and good electrocatalytic performance, and is used in dye-sensitized solar cells, and its photoelectric conversion efficiency reaches 9.50%.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a vanadium diselenide-doped nickel-cobalt selenide yolk-shell structure micron cuboid counter electrode catalyst and a preparation method and application thereof. Background technique [0002] The progress and development of society in the 21st century is often accompanied by a huge consumption of traditional energy and a series of severe environmental and social problems brought about by it. Therefore, based on new energy conversion technology, it is imminent to explore renewable clean energy and develop new green energy conversion devices to deal with increasingly serious environmental and energy problems. Compared with other renewable clean energy sources, solar energy is considered to have great development potential and application prospects due to its advantages of large reserves, wide sources, high energy, safety and environmental protection. The efficient ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/20H01G9/042
CPCH01G9/042H01G9/2022Y02E10/542
Inventor 钱兴刘林春
Owner FUZHOU UNIV
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