Method for preparing nanometer platinum/titanium dioxide nanotube electrode through cyclic voltammetry electrodeposition

A cyclic voltammetry and titanium dioxide technology, which is applied in the field of photoelectric catalysis, can solve the problems of low current density, uneven deposition layer, and high recombination rate of photogenerated carriers, and achieves fine Pt nanoparticles, excellent photoelectric catalytic performance, and wide application prospects. Effect

Active Publication Date: 2014-11-26
BEIJING UNIV OF TECH
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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 nanometer platinum/titanium dioxide nanotube electrode through cyclic voltammetry electrodeposition
  • Method for preparing nanometer platinum/titanium dioxide nanotube electrode through cyclic voltammetry electrodeposition
  • Method for preparing nanometer platinum/titanium dioxide nanotube electrode through cyclic voltammetry electrodeposition

Examples

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example 1

[0022] Example 1. After surface treatment of 1.0mm*1.0mm TA1 titanium sheet, put 1g / LNH 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 5°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 1.0mM chloroplatinic acid + 0.5M sulfuric acid. The scanning speed is 10mV / s, the voltage scanning range is -1 to 0.3V, and the scanning cycle is 20 times. . The test of the prepared electrode to catalyze methanol is: put the electrode into 0.5M H 2 SO 4 +0.5MCH 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. Nitrogen gas was introduced into the solution before the measurement to remove the oxygen dissolved in the solution, and the m...

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 were rinsed, they were placed in an electrolyte solution with a composition of 10.0mM chloroplatinic acid + 0.5M sulfuric acid. The parameters of cyclic voltammetry electrodeposition platinum were: scanning speed was 100mV / s, voltage scanning range was -0.25~0.7, scanning The cycle is 200 times. 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 / Ti nanotube electrodes. Nitrogen gas was introduced into the solution before the measurement to remove the oxygen dissolved in the solution, an...

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 were rinsed, they were placed in an electrolyte solution with a composition of 4.0mM chloroplatinic acid + 0.5M sulfuric acid. The parameters of cyclic voltammetry electrodeposition platinum were: scanning speed was 50mV / s, voltage scanning range was -0.5 to 1.0, scanning The cycle is 50 times. 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. Nitrogen gas was introduced into the solution before the measurement to remove the oxygen dissolved in the solution, and the...

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Abstract

The invention discloses a method for preparing a nanometer platinum / titanium dioxide nanotube electrode through cyclic voltammetry electrodeposition, which belongs to the field of photoelectrocatalysis. At present, most Pt-TiO2 / Ti nanotube electrodes are prepared by adopting a direct-current electrodeposition method, and have the defects of low current density, severe hydrogen evolution reaction and non-uniform deposition of platinum on the surface. The preparation method comprises the following steps of: preparing a titanium dioxide nanotube array which is arranged regularly and is oriented vertically on a titanium sheet by adopting an anode oxidation method; and precipitating Pt in the titanium dioxide nanotube and on the surface of the titanium dioxide nanotube in a solution of chloroplatinic acid and sulfuric acid by adopting a cyclic voltammetry electrodeposition method to obtain a needed electrode. A process disclosed by the invention has the advantages of no need of any surfactant for deposition, easiness, capability of realizing fine Pt nanoparticles, large specific area and superior photoelectrocatalysis performance. The nanometer platinum / titanium dioxide nanotube electrode prepared by using the method can be applied in a plurality of fields such as fuel cells, pollutant treatment, and catalysts.

Description

technical field [0001] The invention discloses a method for preparing nano-platinum / titanium dioxide nanotube electrodes by cyclic voltammetric 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 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26C25D3/50
Inventor 李洪义王金淑刘曼
Owner BEIJING UNIV OF TECH
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