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Method for preparing nano platinum/titanium dioxide nanotube electrode by pulse electrodeposition

A technology of pulse electrodeposition and titanium dioxide, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of low current density, uneven deposition layer, high recombination rate of photogenerated carriers, and achieve Pt nanoparticles The effect of small size, excellent photocatalytic performance, and wide application prospects

Inactive Publication Date: 2011-11-23
BEIJING UNIV OF TECH
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  • Summary
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Problems solved by technology

It also has certain defects: (1) The recombination rate of photogenerated carriers is high, and the efficiency of photocatalytic reaction is low
(2) Pure TiO 2 Nanotube arrays are wide-bandgap semiconductors, which are generally only excited by ultraviolet light and have no response in the visible region, so they have low utilization of sunlight (about 5%), which limits their applications.
(3) TiO 2 The barrier layer between the nanotube array and the substrate (dense TiO 2 ) increases its resistance as an electrode material, which limits its development in the field of electrocatalysis and photoelectrocatalysis
The general method is to deposit nano-platinum particles on it by direct current electrochemical deposition, but the disadvantages of this method are that the current density is very low, hydrogen evolution and concentration polarization are serious, and the deposition layer is uneven.

Method used

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  • Method for preparing nano platinum/titanium dioxide nanotube electrode by pulse electrodeposition
  • Method for preparing nano platinum/titanium dioxide nanotube electrode by pulse electrodeposition
  • Method for preparing nano platinum/titanium dioxide nanotube electrode by pulse electrodeposition

Examples

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example 1

[0022] Example 1. Put 1g / L NH after surface treatment of 1.5mm*1.5mm TA1 titanium 4 HF 2 , 50g / LH 2 The ethylene glycol solution of O was subjected to anodic oxidation at a constant voltage of 10V and a temperature of 20°C for 1h, with constant mechanical stirring during the period. Prepared TiO 2 After the nanotubes are rinsed, they are placed in an electrolyte solution with a composition of 1.0-4.0mM chloroplatinic acid + 0.5M sulfuric acid, and the pulse current density at the cathode is -70mA / cm 2 , the anode pulse current density is 70mA / cm 2 , the cathode pulse conduction time is 10ms, the anode pulse conduction time is 1ms, the off time is 1s, and the electrodeposition time is 15min, that is, the electrode is prepared. The test of the prepared electrode to catalyze methanol is: put the electrode into 0.5M H 2 SO 4 +0.5M CH 3 In the solution of OH, the reference electrode is a saturated calomel electrode, the counter electrode is a platinum electrode, and the work...

example 2

[0023] Example 2. Put 5g / L NH 4 HF 2 , 200g / LH 2 The ethylene glycol solution of O was subjected to anodic oxidation at a constant voltage of 60V and a temperature of 30°C for 6h, with constant mechanical stirring during the period. Prepared TiO 2 After the nanotubes are rinsed, they are placed in an electrolyte solution with a composition of 1.0-4.0mM chloroplatinic acid + 0.5M sulfuric acid, and the pulse current density at the cathode is -10mA / cm 2 , the anode pulse current density is 10mA / cm 2 , the cathode pulse conduction time is 2ms, the anode pulse conduction time is 1ms, the off time is 1s, and the electrodeposition time is 5min, that is, the electrode is prepared. The test of the prepared electrode to catalyze methanol is: put the electrode into 0.5MH 2 SO 4 +0.5M CH 3 In the solution of OH, the reference electrode is a saturated calomel electrode, the counter electrode is a platinum electrode, and the working electrode is Pt-TiO 2 / Ti nanotube electrodes. B...

example 3

[0024] Example 3. Put 3g / L NH 4 HF 2 , 100g / LH 2 The ethylene glycol solution of O was subjected to anodic oxidation at a constant voltage of 30V and a temperature of 10°C for 2h, with constant mechanical stirring during the period. Prepared TiO 2 After the nanotubes are rinsed, they are placed in an electrolyte solution with a composition of 1.0-4.0mM chloroplatinic acid + 0.5M sulfuric acid, and the pulse current density at the cathode is -50mA / cm 2 , the anode pulse current density is 50mA / cm 2 , the cathode pulse conduction time is 6ms, the anode pulse conduction time is 1ms, the off time is 1s, and the electrodeposition time is 25min, that is, the electrode is prepared. The test of the prepared electrode to catalyze methanol is: put the electrode into 0.5M H 2 SO 4 +0.5M CH 3 In the solution of OH, the reference electrode is a saturated calomel electrode, the counter electrode is a platinum electrode, and the working electrode is Pt-TiO 2 nanotube electrodes. Bef...

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Abstract

The invention relates to a method for preparing a nano platinum / titanium dioxide nanotube electrode by pulse electrodeposition, belonging to the technical field of photoelectric catalysis. The existing Pt-TiO2 / Ti nanotube electrodes are mostly prepared by a direct-current electrodeposition method, and have the defects of low current density, serious hydrogen evolution reaction and nonuniform surface deposit platinum. The preparation method of the Pt-TiO2 / Ti nanotube electrode comprises the following steps: preparing a titanium dioxide nanotube array, which is regularly arranged and perpendicularly oriented, on a titanium sheet by an anodic oxidation method, and depositing Pt on the titanium dioxide nanotubes in a chloroplatinic acid / sulfuric acid solution by a pulse electrodeposition method to obtain the required electrode. No surfactant is needed in the deposition process, so the technique is simple, and the Pt nanoparticles are fine and have large specific area and excellent photoelectric catalysis property. The nano platinum / titanium dioxide nanotube electrode prepared by the method provided by the invention is applicable to the fields of fuel batteries, pollution treatment, catalysts and the like.

Description

technical field [0001] The invention discloses a method for preparing nano-platinum / titanium dioxide nanotube electrodes by pulse electrodeposition, which belongs to the technical field of photoelectric catalysis. Background technique [0002] TiO 2 Due to its special structure, nanotube arrays produce surface effects, quantum size effects, etc., which make them have unique photoelectric and electrochemical properties. They have very broad application prospects in the field of photoelectrocatalysis and are one of the most researched semiconductor materials. It also has certain defects: (1) The recombination rate of photogenerated carriers is high, and the efficiency of photocatalytic reaction is low. (2) Pure TiO 2 Nanotube arrays are wide-bandgap semiconductors, which can only be excited by ultraviolet light and have no response in the visible region, so they have low utilization of sunlight (about 5%), which limits their applications. (3) TiO 2 The barrier layer betwee...

Claims

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Application Information

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IPC IPC(8): C25D11/26C25D3/50C25D5/18
Inventor 王金淑李洪义孟祥龙
Owner BEIJING UNIV OF TECH
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