Method for rapidly preparing highly-regular porous anodic aluminum oxide template

A technology of alumina template and porous anode, which is applied in the field of electrochemistry, can solve problems such as breakdown and electrolyte heating, and achieve the effect of rapid preparation and convenient control

Active Publication Date: 2020-12-15
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the current density is very high during the oxidation process, the electrolyte heats up seriously, and breakdown is very easy to occur, so a powerful cooling device must be used to control the low temperature (0 ℃)

Method used

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  • Method for rapidly preparing highly-regular porous anodic aluminum oxide template

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Experimental program
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Effect test

Embodiment 1

[0020] Electrochemical polishing was performed on both sides of a 200 μm thick aluminum foil, including the following steps: (1) soaking in 2 wt% NaOH solution for 2 minutes; wt% H 3 PO 4 , 12 wt% CrO 3 , 8wt% H 2 Constant current electrochemical polishing was performed in a mixed solution of O for 2 minutes at a current density of 120 mA cm -2 , and then rinsed with deionized water. The polished aluminum sheet is folded into an inverted "U" shape, and the two ends of the aluminum sheet are respectively inserted into two independent electrolytic cells. A graphite plate is inserted as an electrode in the two electrolytic cells, and the two graphite plates are parallel to the two ends of the inverted "U"-shaped aluminum plate, and the distance is equal, both of which are 0.5 cm. Two graphite plates are connected to the power lines. The electrolytic cell where the graphite plate connected to the negative electrode of the power supply is located is recorded as the anode elec...

Embodiment 2

[0022] Except that the catholyte was 0.75 M sulfuric acid solution, other steps were the same as in Example 1.

Embodiment 3

[0024] Except that the catholyte was 20 wt% ammonium adipate electrolyte, other steps were the same as in Example 1.

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Abstract

The invention discloses a method for quickly preparing a highly-regular porous anodic aluminum oxide template. The method comprises the following steps that a polished aluminum sheet is folded into aU shape, the two ends of the aluminum sheet are respectively inserted into two independent electrolytic cells, graphite plates are respectively inserted into the two independent electrolytic cells, and the two graphite plates are respectively parallel to the two ends of the aluminum sheet with equal distance; and the total voltage loaded on the two graphite plates is 58-62V, and the temperature ofelectrolyte is 25+ / -2 DEG C. Under the condition of closed bipolar electrochemical anodic oxidation, the aluminum sheet quickly reacts in the high-concentration oxalic acid electrolyte to generate ahighly-regular PAA film, the maximum oxidation current density reaches 151 mA cm<-2>, the maximum growth speed of the PAA film is 2.0[mu]m / min, according to the method, the growth speed of the PAA film can be controlled by changing the solution in the two electrolytic cells and the area of the aluminum sheet in the cathode electrolytic cell, the PAA film grown under high current density is not prone to breakdown, and the aluminum sheet can achieve the anodic oxidation process without wiring through the method.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a method for preparing a porous anodized alumina template, in particular to a method for rapidly preparing a highly regular porous alumina template. Background technique [0002] Porous anodized alumina (PAA) templates are widely used as templates for the synthesis of one-dimensional nanostructured materials due to their highly ordered regularity and easy control of nanopore structures. Among them, the high regularity of the nanopore arrangement of the PAA membrane is the basis for obtaining nanomaterials with excellent properties. In recent years, using PAA as a template, combined with electrochemical deposition, chemical or electrochemical polymerization, chemical vapor deposition, sol-gel and electrophoretic deposition have successfully synthesized and assembled metal, alloy, nonmetal, polymer and other Arrays of nanotubes, nanowires, and quantum dots made of matter. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/10C25D11/16C25F3/20
CPCC25D11/045C25D11/10C25D11/16C25F3/20
Inventor 宋晔倪逸琳王奇杨研刘倩倩朱绪飞
Owner NANJING UNIV OF SCI & TECH
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