Preparation method and application of metal-metal sulfide heterojunction catalyst

A metal sulfide, heterojunction technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of low HOR performance, and achieve the effects of optimizing binding energy, reducing production costs, and excellent catalytic performance.

Pending Publication Date: 2022-05-13
WUHAN UNIV
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  • Preparation method and application of metal-metal sulfide heterojunction catalyst
  • Preparation method and application of metal-metal sulfide heterojunction catalyst
  • Preparation method and application of metal-metal sulfide heterojunction catalyst

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[0032] The invention provides a method for preparing a metal-metal sulfide heterojunction catalyst, comprising the following steps: preparing a metal sulfide precursor through a colloid synthesis method, and calcining the precursor in a reducing atmosphere to obtain the heterojunction catalyst.

[0033] Further, the metal sulfide is selected from Pd 4 S, Rh 2 S 3 or RuS 2 , preferably, Pd 4 S.

[0034] Further, the preparation method of the metal sulfide precursor includes: dissolving metal acetylacetonate, sulfur powder, solvent, and carbon carrier together, heating and reacting at 280-350°C for 60-120min; preferably, at 300 Heating and reacting at ℃ for 60 minutes; further, the solvent is selected from pure oleylamine, oleylamine and octadecene, oleylamine and dodecylamine, oleylamine and oleic acid, preferably pure oleylamine; further, The carbon carrier is selected from the carbon carrier XC-72 carbon, activated carbon, graphene, reduced graphene oxide, acetylene blac...

Embodiment 1

[0043] Pd-Pd 4 The preparation method of S / C heterojunction catalyst:

[0044] Oleylamine (5.0 mL), sulfur powder (16.0 mg), palladium acetylacetonate (30.4 mg) and XC-72 carbon powder (30.0 mg) were added to a three-necked flask and magnetically stirred. Subsequently, the temperature of the solution was increased to 100° C., and the reaction was performed in vacuum for 20 minutes to remove moisture and oxygen in the reaction system. After refilling with nitrogen, the temperature was further raised to 300°C, kept at this temperature for 60 minutes, and cooled to room temperature naturally. Then the samples were collected by centrifugation, washed by adding n-hexane and ethanol successively, and dried under vacuum at room temperature. Finally, the dried sample was put into the quartz boat in the center of the tube furnace, and calcined in a reducing atmosphere with a volume ratio of nitrogen and hydrogen of 20:1 at a temperature of 400°C for 60 minutes to obtain Pd-Pd 4 S / C....

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Abstract

The invention discloses a preparation method and application of a metal-metal sulfide heterojunction catalyst, and belongs to the technical field of electrocatalyst preparation. The preparation method comprises the following steps: preparing a metal sulfide precursor by a colloid synthesis method, and calcining the precursor in a reducing atmosphere to obtain the metal-metal sulfide heterojunction catalyst. The electron transfer of the catalyst at the interface is beneficial to optimizing the binding energy of an intermediate, the alkaline hydroxide activity is greatly improved, meanwhile, the catalyst has a huge application prospect in the field of alkaline exchange membrane fuel cells, the cost is reduced, and the catalyst variety is widened.

Description

technical field [0001] The invention relates to the technical field of electrocatalyst preparation, in particular to a preparation method and application of a metal-metal sulfide heterojunction catalyst. Background technique [0002] Hydrogen is considered as one of the most promising alternatives to traditional fossil fuels due to its high energy density and zero carbon emissions, and efficient energy conversion from hydrogen to electricity can be achieved through fuel cells. However, in the practical application of proton exchange membrane fuel cells (PEMFC), the cathodic oxygen reduction reaction (ORR) still faces the problem of loading a large amount of platinum (Pt) in the acidic electrolyte to catalyze it. In recent years, alkaline exchange membrane fuel cells (AEMFCs) have received much attention due to the development of alkaline exchange membranes and the development of highly efficient and inexpensive transition metal-based electrocatalysts with platinum (Pt)-like ...

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Application Information

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IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/926H01M4/923H01M4/88
Inventor 罗威苏立新李芸博靳一鸣
Owner WUHAN UNIV
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