Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing flower-shaped nano-cobalt metal using anodized aluminum oxide template and its product

An anodic aluminum and nano metal technology, applied in nanotechnology and other directions, can solve the problems of complex operation, high cost, unfavorable large-scale production, etc., and achieve the effect of simple and fast method and mild reaction conditions

Active Publication Date: 2017-08-25
BEIHANG UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the preparation methods of metal cobalt, such as gas-phase hydrogen reduction method, ray irradiation method, microemulsion method, oxalate thermal decomposition method, hydrothermal / solvothermal method, etc., most of them are complicated to operate and require reaction conditions such as high temperature and high pressure, which is not conducive to mass production
The preparation of metal nanomaterials with AAO templates usually requires spraying gold on one side of the AAO, and the powder material is obtained after the template is removed, and the cost is also high

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
  • Method for preparing flower-shaped nano-cobalt metal using anodized aluminum oxide template and its product
  • Method for preparing flower-shaped nano-cobalt metal using anodized aluminum oxide template and its product
  • Method for preparing flower-shaped nano-cobalt metal using anodized aluminum oxide template and its product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1×2cm 2 Half of the conductive glass FTO is spin-coated with a layer of 6% polyvinyl alcohol solution (spin-coating speed 2000rpm), followed by an anodic aluminum oxide (AAO) layer with a pore size of 80-100nm, (the size is 1cm × 1cm, that is, The electrode area participating in the electrochemical reaction is 1cm 2 ), placed in a vacuum oven at 150°C for 2 hours to obtain a working electrode. Prepare 0.1 mol / L cobaltous sulfate and boric acid aqueous solutions respectively, and use them as the electrolyte of the three-electrode system after mixing.

[0032] Using a three-electrode system, the counter electrode is a platinum sheet electrode, the reference electrode is a saturated calomel electrode, the current-time method is selected, the voltage is -1.5V, and the electrodeposition is carried out on the working electrode, and the deposition time is 60min. After electrodeposition, the anodized aluminum template was removed with 1mol / L sodium hydroxide solution, and fin...

Embodiment 2

[0035] Selectively coat a layer of 6% polyvinyl alcohol solution on the conductive glass FTO, then adhere the anodic aluminum oxide (AAO) layer with a pore size of 40-70nm, put it in a vacuum oven at 150°C for 2 hours, and obtain the working electrode (size 1cm x 1cm). Prepare 0.1 mol / L cobaltous sulfate and boric acid aqueous solutions respectively, and mix them as the electrolyte solution of the three-electrode system.

[0036] Using a three-electrode system, the counter electrode is a platinum sheet electrode, the reference electrode is a saturated calomel electrode, the current-time method is selected, the voltage is -1.5V, and the electrodeposition is carried out on the working electrode, and the deposition time is 60min. After electrodeposition, the anodized aluminum template was removed with 1mol / L sodium hydroxide solution, and finally the working electrode was cleaned three times with ultrapure water.

[0037] The SEM spectrum of the obtained material is as image 3...

Embodiment 3

[0039] Spin-coat a layer of 6% polyvinyl alcohol solution on the conductive glass FTO (spin-coating speed 2000rpm), then adhere an anodic aluminum oxide (AAO) layer with a pore size of 160-200nm, and put it in a vacuum oven at 150°C for 2 hours , to get the working electrode. Prepare 0.1 mol / L cobaltous sulfate and boric acid aqueous solutions respectively, and mix them as the electrolyte solution of the three-electrode system.

[0040] Using a three-electrode system, the counter electrode is a platinum sheet electrode, the reference electrode is a saturated calomel electrode, the current-time method is selected, the voltage is -1.5V, and the electrodeposition is carried out on the working electrode, and the deposition time is 60min. After electrodeposition, the anodized aluminum template was removed with 1mol / L sodium hydroxide solution, and finally the working electrode was cleaned three times with ultrapure water.

[0041] The SEM spectrum of the obtained material is as ...

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

No PUM Login to View More

Abstract

The invention provides a method for preparing a flower-shaped nano-cobalt metal using conductive glass FTO, anodized aluminum template (AAO) and a water-based polymer adhesive as a composite electrode, including step (1) preparation of a working electrode: The polyvinyl alcohol (PVA) solution is spin-coated on the conductive glass, and the anodized aluminum template is bonded to obtain the FTO / PVA / AAO composite electrode. (2) Preparation of the electrolyte: prepare cobaltous sulfate and boric acid solutions respectively, and mix them , (3) electrodeposition reaction: using a three-electrode system, constant voltage electrodeposition is carried out on the composite working electrode; (4) post-treatment: soak the electrodeposited working electrode in sodium hydroxide to remove the anodized aluminum template. The present invention uses FTO / PVA / AAO as composite working electrode to prepare metal cobalt with new flower-like nanostructure through constant voltage deposition. The method is simple and fast. Compared with traditional methods, the reaction conditions are mild, the time is short and the efficiency is high, and high temperature is not required. high pressure conditions.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a method for preparing nanoscale metal materials by an electrochemical method. Background technique [0002] Metal cobalt is widely used in many fields due to its special properties, such as hard metals, ceramic chemicals, catalysis, batteries and magnetic materials. The magnetic recording material made of cobalt alloy has many advantages such as high recording density, large coercive force, good signal-to-noise ratio, and good oxidation resistance; adding cobalt to nickel-metal hydride batteries can improve the discharge specific capacity and high-current charge and discharge cycle stability. The structure of the material determines the properties of the material, and the microstructure and size of metal cobalt have a decisive effect on its properties, so its properties can be changed by changing the microstructure and size of metal cobalt. Therefore, the preparation...

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): C25D5/54C25D3/12B82Y40/00
Inventor 陈爱华饶帆
Owner BEIHANG UNIV