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CN-121992444-A - Y and S co-doped RuO2Electrocatalyst, preparation method and application thereof

CN121992444ACN 121992444 ACN121992444 ACN 121992444ACN-121992444-A

Abstract

The invention discloses a Y and S co-doped RuO 2 electrocatalyst, a preparation method and application thereof, wherein anhydrous ruthenium trichloride, anhydrous yttrium chloride and sulfur powder are added into absolute ethyl alcohol, the mixture is stirred and dispersed uniformly, the obtained mixture is transferred into a muffle furnace, the temperature is raised to 550-650 ℃ to calcine for 1.5-3.5 h, then the mixture is cooled to room temperature, the product is ground into powder, and the Y and S co-doped RuO 2 electrocatalyst is obtained.

Inventors

  • ZHENG LINGXIA
  • WANG HAILONG
  • JIA YI

Assignees

  • 浙江工业大学

Dates

Publication Date
20260508
Application Date
20260303

Claims (9)

  1. 1. The Y, S co-doped RuO 2 electrocatalyst is characterized by being prepared by the following method: adding anhydrous ruthenium trichloride, anhydrous yttrium chloride and sulfur powder into absolute ethanol, stirring and dispersing uniformly, transferring the obtained mixture into a muffle furnace, heating to 550-650 ℃ and calcining for 1.5-3.5 h, cooling to room temperature, and grinding the product into powder to obtain the Y, S co-doped RuO 2 electrocatalyst.
  2. 2. The Y, S co-doped RuO 2 electrocatalyst according to claim 1, wherein the molar ratio of anhydrous yttrium chloride, sulphur powder, anhydrous ruthenium trichloride is 1:1:50.
  3. 3. The Y, S co-doped RuO 2 electrocatalyst according to claim 1, wherein the volume molar ratio of absolute ethanol to absolute ruthenium trichloride is 6-10:1, mL/mmol.
  4. 4. The Y, S co-doped RuO 2 electrocatalyst according to claim 1, wherein the temperature is raised to 550-650 ℃ at a rate of 5 ℃ per minute for calcination for 1.5-3.5 hours, and cooled to room temperature at a rate of 5 ℃ per minute.
  5. 5. The use of a Y, S co-doped RuO 2 electrocatalyst according to claim 1 in an acidic electrocatalytic oxygen evolution reaction.
  6. 6. The use according to claim 5, characterized in that the application method is as follows: Preparing a Y, S co-doped RuO 2 electrocatalyst into catalyst ink which is loaded on carbon paper to serve as a working electrode, a carbon rod serves as a counter electrode, ag/AgCl serves as a reference electrode, and performing electrocatalytic oxygen evolution reaction in electrolyte; the electrolyte is sulfuric acid water solution.
  7. 7. The method according to claim 6, wherein the catalyst ink is prepared by mixing Y and S co-doped RuO 2 electrocatalyst, deionized water, ethanol, 5wt% Nafion at a ratio of 5 mg:485. Mu.L:485. Mu.L:30. Mu.L.
  8. 8. The use according to claim 6, wherein the loading of the Y, S co-doped RuO 2 electrocatalyst on the carbon paper is 0.4 mg/cm 2 .
  9. 9. The use according to claim 6, wherein the electrolyte is an aqueous solution of 0.5M% sulfuric acid.

Description

Y and S co-doped RuO 2 electrocatalyst, and preparation method and application thereof Technical Field The invention relates to a Y, S co-doped RuO 2 electrocatalyst, a preparation method and application thereof, and belongs to the technical field of electrocatalysis. Background The energy structure of China depends on fossil fuel for a long time, but the environmental problems of global warming, greenhouse effect and the like caused by non-renewable and CO 2 isothermal chamber gas generated after combustion are increasingly serious. Therefore, it is urgent to find a sustainable clean energy source. Along with the promotion of the 'double carbon' target, hydrogen energy is becoming an important component of a future energy system due to the advantages of wide sources, high heat value, cleanness, no pollution and the like. Researches show that the water electrolysis technology is an efficient and environment-friendly hydrogen production method. The technology currently mainly includes alkaline electrolyzed water (AWE), proton exchange membrane electrolyzed water (PEMWE), solid oxide electrolyzed water (SOEC), and anion exchange membrane electrolyzed water (AEMWE). Among them, the proton exchange membrane-based acidic electrolyzed water technology (i.e., PEMWE) has been attracting attention because of its ability to achieve high current density (> 2A/cm 2), high energy conversion efficiency (80-90%), high hydrogen purity (> 99.99%), and high adaptability to fluctuating renewable energy sources. The water electrolysis process consists of two half reactions, namely the Oxygen Evolution Reaction (OER) at the anode and the Hydrogen Evolution Reaction (HER) at the cathode. HER is a simple two-electron transfer process, the reaction kinetics is faster, OER relates to a complex four-electron transfer process, the reaction kinetics is slow, a higher overpotential is often required, and the catalyst is easy to dissolve or deactivate under a strong acid condition, so that the stability is difficult to ensure, and the large-scale commercial application of PEMWE technology is severely restricted. Therefore, the development of OER catalysts with high activity and high stability under acidic conditions is a key problem that is driving PEMWE towards commercialization and urgent needs to be solved. Noble metal oxides IrO 2 and RuO 2 are considered as basic electrocatalysts for acidic OER. Among them, ruO 2 is relatively low in price and higher in catalytic activity, but in an acidic environment with a potential higher than 1.39V, its lattice oxygen may participate in oxidation and form soluble RuO 4, leading to dissolution of active components and a decrease in catalyst stability. The element doping strategy can remarkably improve the catalytic activity, reduce the reaction energy barrier and optimize the adsorption and activation capability of reactants by introducing external atoms to regulate the electronic structure and surface characteristics of the catalyst. Meanwhile, doping is also beneficial to realizing the multifunctional regulation and control of the catalyst and the optimization of the reaction path, so that the catalyst has excellent comprehensive performance in electrocatalytic reactions such as acid OER. Therefore, the activity and stability of RuO 2 in acidic OER are improved by reasonable element doping, and have become one of the research hotspots in the field. Disclosure of Invention The invention aims to provide a Y and S co-doped RuO 2 electrocatalyst, a preparation method and application thereof. The method adopts a one-step calcination method to dope the Y and S elements into the RuO 2, has the advantages of simple process and equipment, low energy consumption and the like, and can effectively improve the electrochemical water decomposition activity and stability of the RuO 2 catalytic acidic medium. The technical scheme of the invention is as follows: The Y, S co-doped RuO 2 electrocatalyst is prepared by the following method: Adding anhydrous ruthenium trichloride (RuCl 3), anhydrous yttrium chloride (YCl 3) and sulfur powder (S) into absolute ethanol, stirring and dispersing uniformly, transferring the obtained mixture into a muffle furnace, heating to 550-650 ℃ and calcining for 1.5-3.5 h, cooling to room temperature, grinding the product into powder to obtain a Y, S co-doped RuO 2 electrocatalyst, wherein Y-S-RuO X is recorded, more oxygen vacancies are induced after Y, S doping (figure 4), and the metering ratio of O is less than 2; Wherein, the The reaction materials are all in anhydrous state; preferably, the molar ratio of the anhydrous yttrium chloride, the sulfur powder and the anhydrous ruthenium trichloride is 1:1:50, and the total molar percentage of Y and S relative to Ru is not higher than 10 percent; Preferably, the volume molar ratio of the absolute ethyl alcohol to the absolute ruthenium trichloride is 6-10:1, and the ratio is mL/mmol; Preferably, the temperature is raised to 550-65