Tantalum nitride nanotube array electrode and preparation method thereof

A nanotube array and tantalum nitride technology, which is applied in the field of photoelectrochemistry, can solve the problems of small surface area, limitation, and obstruction of electron transport, and achieve the effects of good repeatability, overcoming discontinuous irradiation, and high photocatalytic activity

Inactive Publication Date: 2014-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims to solve the problem that the traditional tantalum nitride nanomaterial has a small surface area, and the connection between the tantalum nitride nanotube array material and the substrate has not been firmly connected for a long time, hindering the transmission of electrons, which limits the application of the tantalum nitride nanotube array electrode in the field of photoelectric catalysis. The technical problem of the application is to provide a tantalum nitride nanotube array electrode and its preparation method. The tantalum nitride nanotube array electrode closely connected with the substrate is prepared by secondary anodic oxidation, and has good photocatalytic performance

Method used

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  • Tantalum nitride nanotube array electrode and preparation method thereof
  • Tantalum nitride nanotube array electrode and preparation method thereof
  • Tantalum nitride nanotube array electrode and preparation method thereof

Examples

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Embodiment 1

[0037] (1) Preparation of Ta substrate

[0038] Cut a metal Ta sheet with a thickness of 0.25mm and a purity of 99.5% into 1×2cm 2 Small pieces of, respectively, ultrasonic treatment in acetone, deionized water, ethanol solution for 30 minutes; clean the surface with deionized water; dry;

[0039] (2) Preparation of electrolyte

[0040] Take 27ml H 2 SO 4 , 2.5ml deionized water, 0.5ml HF aqueous solution, prepared into a concentration of 0.383mol / L HF H 2 SO 4 The solution is ready for use. Take 27ml H 2 SO 4 , 2.7ml deionized water, 0.3ml HF aqueous solution, prepared into a concentration of 0.230mol / L HF H 2 SO 4 The solution is ready for use.

[0041] (3) Primary anodic oxidation

[0042] In a standard two-electrode electrochemical cell, the H of HF with a concentration of 0.383mol / L 2 SO 4 The solution is an electrolyte solution, measuring 1×2cm 2 Ta sheet is anode, 2×2cm 2 The platinum electrode is the cathode, the distance between the two electrodes is 1cm, the DC voltage of the...

Embodiment 2

[0052] (1) The preparation of Ta substrate is the same as in Example 1.

[0053] (2) The preparation of the electrolyte is the same as in Example 1.

[0054] (3) The conditions and process of primary anodization are the same as in Example 1.

[0055] (4) Secondary anodic oxidation

[0056] In a standard two-electrode electrochemical cell, the H of HF with a concentration of 0.230mol / L 2 SO 4 The solution is an electrolyte solution, and the ultrasonic Ta substrate is used as the anode, 2×2cm 2 The platinum electrode is the cathode, the distance between the two electrodes is 1cm, the DC voltage of the potentiostat is 5V, the oxidation temperature is 0°C, and the oxidation time is 5min. Perform anodization; carefully rinse off the electrolyte solution on the surface with deionized water;

[0057] (5) The nitriding treatment conditions and process are the same as in Example 1.

[0058] The experimental results show that the inner diameter of the nanotubes of the tantalum nitride nanotube arr...

Embodiment 3

[0061] (1) The preparation of Ta substrate is the same as in Example 1.

[0062] (2) The preparation of the electrolyte is the same as in Example 1.

[0063] (3) The conditions and process of primary anodization are the same as in Example 1.

[0064] (4) Secondary anodic oxidation

[0065] In a standard two-electrode electrochemical cell, the H of HF with a concentration of 0.230mol / L 2 SO 4 The solution is an electrolyte solution, and the ultrasonic Ta substrate is used as the anode, 2×2cm 2 The platinum electrode is the cathode, the distance between the two electrodes is 1cm, the DC voltage of the potentiostat is 35V, the oxidation temperature is 0°C, and the oxidation time is 5min, for anodic oxidation; carefully rinse off the electrolyte solution on the surface with deionized water;

[0066] (5) The nitriding treatment conditions and process are the same as in Example 1.

[0067] Experimental results show that the inner diameter of the nanotubes of the tantalum nitride nanotube array...

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Abstract

The invention discloses a tantalum nitride nanotube array electrode and a preparation method thereof. The electrode comprises a tantalum nitride (Ta3N5) nanotube array on a tantalum (Ta) substrate. The preparation method comprises three steps, namely, primary anodic oxidation, secondary anodic oxidation and nitriding roasting treatment. Compounding of electron-hole pairs is effectively inhibited, the water photolysis efficiency of a material is improved, the connection state of the nanotube array and the substrate is remarkably improved, and the hydrogen production activity of water photolysis of a photoelectrochemistry pond is improved. The preparation method disclosed by the invention is simple in operation process, high in controllability, stable in photoelectrocatalysis and good in repeatability.

Description

Technical field [0001] The present invention relates to the technical field of photoelectrochemistry, in particular to a kind of tantalum nitride (Ta 3 N 5 ) Nanotube array electrode and its preparation method. Background technique [0002] With the increasing shortage of fossil energy, the use of new green renewable energy to replace non-renewable fossil energy has become the focus of attention worldwide. Solar energy has attracted more and more attention from academic circles and the industry due to its large energy radiation, good renewable performance, and environmental friendliness. However, how to efficiently use solar energy is still a major challenge facing people. [0003] Hydrogen energy has attracted much attention among many renewable energy sources because of its high-energy, clean, and wide application fields. As a new type of hydrogen production method, the solar photoelectrochemical cell splits water to produce hydrogen, which truly realizes the green and reasonab...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 巩金龙张鹏王拓张冀杰常晓侠李盎
Owner TIANJIN UNIV
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