Search

CN-121983565-A - Carbon-based iodine carrier material containing tri-metal atom catalytic center and preparation method and application thereof

CN121983565ACN 121983565 ACN121983565 ACN 121983565ACN-121983565-A

Abstract

The invention relates to the technical field of iodine carrier materials, in particular to a carbon-based iodine carrier material containing a tri-metal atom catalytic center, a preparation method and application thereof. The preparation method of the carbon-based iodine carrier material with the tri-metal atom catalytic center comprises the following steps of dispersing ketjen black in a solvent to obtain a dispersion liquid, adding cobalt acetate, 1,3, 5-triazine-2, 4-diamine and 1,1' -carbonyl diimidazole into the dispersion liquid, performing ultrasonic treatment, then heating for reaction, naturally cooling the reaction liquid to room temperature after the reaction is completed, and filtering, washing and drying to obtain the carbon-based iodine carrier material with the tri-metal atom catalytic center. The carbon-based iodine carrier material designed by the invention has high-efficiency catalytic active sites, optimizes the conversion process of multi-iodine ions, and remarkably improves the stability and high-rate performance of the carbon-based iodine carrier material, thereby realizing the cooperative improvement of the performance of the iodine anode.

Inventors

  • CUI XUN
  • WANG YONGLIN
  • JIN RAN
  • WU MINGJIE
  • YANG YINGKUI

Assignees

  • 武汉纺织大学

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. A method for preparing a carbon-based iodine carrier material containing a trimetallic atomic catalytic center, which is characterized by comprising the following steps: dispersing ketjen black in a solvent to obtain a dispersion; adding cobalt acetate, 1,3, 5-triazine-2, 4-diamine and 1,1' -carbonyl diimidazole into the dispersion liquid, performing ultrasonic treatment, and then performing heating reaction; After the reaction is completed, the reaction solution is naturally cooled to room temperature, and then is filtered, washed and dried to obtain the carbon-based iodine carrier material containing the tri-metal atom catalytic center.
  2. 2. The method of claim 1, wherein the mass to volume ratio of ketjen black to solvent is 100-300 mg:50 ml.
  3. 3. The method according to claim 1, wherein the mass of ketjen black, the mole of cobalt acetate, the mole of 1,3, 5-triazine-2, 4-diamine, and the mole of 1,1' -carbonyl bisimidazole are in a ratio of 100 to 300 mg:0.3 mmol:0.6 mmol:0.3 mmol.
  4. 4. The method of claim 1, wherein the solvent is toluene or dimethylformamide.
  5. 5. The method according to claim 1, wherein the heating reaction is carried out at a temperature of 100 to 160 ℃ for a reaction time of 24 to 72 hours.
  6. 6. The method of claim 1, wherein the aqueous solution is washed with deionized water and ethanol in sequence and dried under vacuum at 70-80 ℃ overnight.
  7. 7. A carbon-based iodophor material containing a trimetallic atomic catalytic center prepared by the method of any one of claims 1-6.
  8. 8. Use of the carbon-based iodine carrier material containing the three-metal atom catalytic center in the positive electrode of zinc-iodine battery according to claim 7, wherein the carbon-based iodine carrier material containing the three-metal atom catalytic center is loaded with iodine simple substance and then used as the iodine positive electrode material.
  9. 9. The application of claim 8, wherein the iodine anode material, the conductive agent and the binder are mixed according to a certain proportion and coated on a current collector to obtain the anode sheet.
  10. 10. A zinc-iodine battery comprising the positive electrode sheet, the negative electrode zinc sheet, the separator and the zinc salt electrolyte of claim 9.

Description

Carbon-based iodine carrier material containing tri-metal atom catalytic center and preparation method and application thereof Technical Field The invention relates to the technical field of iodine carrier materials, in particular to a carbon-based iodine carrier material containing a tri-metal atom catalytic center, a preparation method and application thereof. Background Zinc-iodine battery has high specific capacity (211 mAh g1 ) The advantages of high redox potential (about 0.54V vs. H +/H), good safety, abundant zinc and iodine resources, low cost and the like are receiving great attention. However, zinc-iodine batteries still face challenges such as low conductivity of iodine and polyiodide ions, ease of dissolution of reaction intermediates in the electrolyte, slow conversion rate of polyiodide ions, and shuttle effect. The ideal iodophor material should possess high electronic conductivity and hierarchical porous structure. The high electron conductivity can promote the rapid transmission of electrons in electrochemical reaction, and the hierarchical porous structure can effectively bear iodine active substances, and inhibit the dissolution and diffusion of polyiodide ions of intermediate products through physical confinement effect, so that the utilization rate of iodine simple substances is improved, and the shuttle effect is inhibited. The carbon material becomes an ideal candidate of the iodine carrier material due to the excellent conductivity, the abundant micro-mesoporous structure and the more convenient acquisition way. However, carbon materials often lack active catalytic sites and are relatively stable in surface chemistry, making it difficult to effectively adsorb polyiodide intermediates, thereby limiting their ability to regulate the catalytic reaction process. In the conversion process of iodide ions, key intermediates comprise iodide anions, iodine simple substances, iodine trisnions, iodine pentaanions and the like. Carbon-based monoatomic catalysts (SACs) have become a research hotspot for iodide ion conversion reactions due to their atomically dispersed catalytic sites, high conductivity and adjustable coordination environment. However, the catalytic efficiency of SACs is limited by the linear scale relationship of the adsorption energy, and it is difficult to independently optimize the adsorption energy of a plurality of intermediates, which restricts the improvement of the reaction kinetics to some extent. As an expansion of SACs, carbon-based diatomic catalysts (DACs) have been attracting attention in the research of the conversion process of polyiodide ions because of their ability to adjust the linear scale relationship of adsorption energy. However, the catalytic performance of DACs has not yet fully reached the expectations, and is mainly limited by the spatial fixation of the bimetallic sites, which limits the adjustment range of the adsorption energy of intermediates such as iodine trinitrate, iodine penta-anion, and the like, and thus cannot realize fully independent adsorption energy optimization. Three-metal atom catalysts (TACs) are a new approach to solve the above problems by further adjusting the linear scale relationship of adsorption energy through the synergistic effect between metal atoms. Through the synergistic effect of adjacent metal centers, the TACs can adjust the charge distribution of the intermediate product, so that the dynamic performance of the catalytic reaction is optimized, and the catalytic activity is obviously improved. In addition, TACs exhibit great potential in decoupling adsorption energy, improving long-term stability, and optimizing reaction kinetics. The existing preparation method of the carbon-based TACs mainly depends on pyrolysis synthesis, but the process is usually accompanied with the problems of poor metal dispersibility, insufficient thermal stability, high energy consumption, environmental pollution and the like. Disclosure of Invention The invention aims at overcoming the defects in the prior art, and provides a carbon-based iodine carrier material containing a tri-metal atom catalytic center, a preparation method and application thereof, wherein the carbon-based iodine carrier material has high conductivity, inhibits multi-iodine ion dissolution, promotes multi-iodine ion conversion and effectively inhibits a shuttle effect. The first object of the invention is to provide a method for preparing a carbon-based iodine carrier material containing a tri-metal atom catalytic center, which comprises the following steps: dispersing ketjen black in a solvent to obtain a dispersion; adding cobalt acetate, 1,3, 5-triazine-2, 4-diamine and 1,1' -carbonyl diimidazole into the dispersion liquid, performing ultrasonic treatment, and then performing heating reaction; After the reaction is completed, the reaction solution is naturally cooled to room temperature, and then is filtered, washed and dried to obtain the carbon-based iodine carrie