Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A preparation method of Cu-doped hollow hexagonal ZIF-8 material for zinc-air batteries

A ZIF-8, zinc-air battery technology, applied in the direction of fuel cell-type half-cell and primary cell-type half-cell, battery electrodes, circuits, etc., can solve the problem of increasing mass transfer capacity, low ORR activity, zinc-air battery, etc. problem, to achieve the effect of increasing catalytic activity, wide application and simple production process

Active Publication Date: 2022-02-15
ZHEJIANG UNIV OF TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, although there are a variety of preparation methods for ZIF-8, there are few preparation methods for the preparation of copper-supported hollow hexagonal ZIF-8 materials, and the ORR activity of ZIF-8 is not high and it is difficult to be applied to zinc-air batteries. , while the hollow ZIF-8 can generate more active sites, increase the mass transfer capacity, thereby enhancing the ORR catalytic activity, and Cu as the active site can promote the ORR activity more strongly
In addition, the morphology of the ZIF-8 material prepared by the existing technology is relatively simple, and the hollow ZIF-8 material with hexagonal morphology has not been reported.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A preparation method of Cu-doped hollow hexagonal ZIF-8 material for zinc-air batteries
  • A preparation method of Cu-doped hollow hexagonal ZIF-8 material for zinc-air batteries
  • A preparation method of Cu-doped hollow hexagonal ZIF-8 material for zinc-air batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1: put dimethylimidazole and zinc nitrate hexahydrate into methanol solution at a ratio of 4:1 and stir for 24 hours to obtain ZIF-8, centrifuge and dry;

[0044] Step 2: put ZIF-8 into water, put tannic acid solution into the above solution, stir to obtain hollow ZIF-8, centrifuge and dry;

[0045] Step 3: Put dicyandiamide in a muffle furnace and calcinate to obtain g-C 3 N 4 ;

[0046] Step 4: Put the hollow ZIF-8 into the methanol solution and put the methanol solution in which copper nitrate is dissolved into the above solution and stir to obtain the precursor CuHZ-8, centrifuge and dry;

[0047] Step 5: Combine CuHZ-8 and g-C 3 N 4 Mix and grind evenly in a mortar and then put it into a tube furnace for calcination at 800°C to obtain C-CuHZ-8;

[0048] Step 6: Wash C-CuHZ-8 with 0.5M sulfuric acid, filter and dry.

[0049] The copper-doped hollow ZIF-8 material prepared by the above method was characterized by scanning electron microscopy. In the experi...

Embodiment 2

[0058] Step 1: put dimethylimidazole and zinc nitrate hexahydrate into methanol solution at a ratio of 4:1 and stir for 24 hours to obtain ZIF-8, centrifuge and dry;

[0059] Step 2: Put ZIF-8 into water, put 8 mg / mL tannic acid solution into the above solution, stir to obtain hollow ZIF-8, centrifuge and dry;

[0060] Step 3: Put dicyandiamide into a muffle furnace and calcinate at 550°C for 4 hours to obtain g-C 3 N 4 ;

[0061] Step 4: Put the hollow ZIF-8 into the methanol solution and put the methanol solution in which copper nitrate is dissolved into the above solution and stir to obtain the precursor CuHZ-8, centrifuge and dry;

[0062] Step 5: Combine CuHZ-8 and g-C 3 N 4 Mix and grind evenly in a mortar and then put it into a tube furnace for calcination at 700°C to obtain C-CuHZ-8;

[0063] Step 6: Wash C-CuHZ-8 with 0.5M sulfuric acid, filter and dry at 60°C.

Embodiment 3

[0065] Step 1: put dimethylimidazole and zinc nitrate hexahydrate into methanol solution at a ratio of 3:1 and stir for 24 hours to obtain ZIF-8, centrifuge and dry;

[0066] Step 2: put ZIF-8 into water, put tannic acid solution into the above solution, stir to obtain hollow ZIF-8, centrifuge and dry;

[0067] Step 3: Put dicyandiamide into a muffle furnace and calcinate at 550°C for 4 hours to obtain g-C 3 N 4 ;

[0068] Step 4: Put the hollow ZIF-8 into the methanol solution and put the methanol solution in which copper nitrate is dissolved into the above solution and stir to obtain the precursor CuHZ-8, centrifuge and dry;

[0069] Step 5: Combine CuHZ-8 and g-C 3 N 4 Mix and grind evenly in a mortar and then put it into a tube furnace for calcination at 800°C to obtain C-CuHZ-8;

[0070] Step 6: Wash C-CuHZ-8 with 0.5M sulfuric acid, filter and dry at 60°C.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
current densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a Cu-doped hollow hexagonal ZIF-8 material for a zinc-air battery, comprising the following steps: using dimethylimidazole and zinc nitrate hexahydrate as raw materials to synthesize the ZIF-8 material; Nitric acid turns ZIF‑8 into a hollow ZIF‑8 material; then put the hollow ZIF‑8 into a copper nitrate solution to obtain a CuHZ‑8 precursor, and use dicyandiamide to calcinate in a muffle furnace at 550 ° C to obtain g‑C 3 N 4 , combining CuHZ‑8 with g‑C 3 N 4 Uniformly mixed and put into a tube furnace for calcination, and finally washed with sulfuric acid to obtain a Cu-loaded hollow hexagonal ZIF‑8 material. The invention has the beneficial effects of sufficient sources of raw materials, large reserves and easy acquisition, little pollution, easy mass production, high N content, controllable pore size and quantity in a wide range, and good electrochemical performance. It exhibits superior ORR performance and stability than Pt / C in RDE, and the assembled Zn-air battery has excellent discharge performance and high power density.

Description

technical field [0001] The invention relates to the technical field of zinc-air battery materials, in particular to a method for preparing a copper-doped hollow hexagonal ZIF-8 material for zinc-air batteries. Background technique [0002] Zinc-air batteries have attracted increasing attention due to their advantages such as abundant zinc storage, high theoretical energy density (1086Wh / Kg), high safety, and low price. Zinc-air batteries mainly include: negative electrode, positive electrode and electrolyte. Among them, the slow kinetic reaction rate of the positive electrode is the main factor hindering the performance of Zn-air batteries. Therefore, the development of cathode catalysts with excellent ORR activity is of great significance for the development of Zn-air batteries. As a traditional ORR catalyst, Pt / C has the disadvantages of high price, easy poisoning and low storage capacity. Therefore, many scholars have been studying non-noble metal materials to replace ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/06
CPCH01M4/90H01M4/9041H01M4/8825H01M4/8882H01M4/8885H01M12/06
Inventor 高云芳吴佳豪武海华徐新
Owner ZHEJIANG UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com