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Method for simultaneously depositing nickel-iron modified titanium dioxide nanotube electrode

A titanium dioxide, simultaneous deposition technology, applied in electrodes, nanotechnology, nanotechnology and other directions, can solve the problems of difficult to control nickel-iron atomic ratio, low deposition efficiency, etc., achieve regular morphology, reduce hydrogen evolution side reactions, and good stability. Effect

Active Publication Date: 2020-11-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of method of simultaneously depositing nickel-iron modified titania nanotube electrode, to solve the low deposition efficiency when depositing ferronickel in the prior art, be difficult to control the nickel in deposit - The problem of iron atomic ratio

Method used

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  • Method for simultaneously depositing nickel-iron modified titanium dioxide nanotube electrode
  • Method for simultaneously depositing nickel-iron modified titanium dioxide nanotube electrode
  • Method for simultaneously depositing nickel-iron modified titanium dioxide nanotube electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) The titanium foil treated with acetone, ethanol and deionized water was oxidized with a two-electrode system constant voltage, and the oxidation solution was composed of 90ml ethylene glycol, 10ml deionized water, and 2wt% (mixed solution) of ammonium fluoride. Titanium foil and platinum electrode were used as anode and cathode respectively, the oxidation voltage was 50V, and the oxidation time was 1.5h. After oxidation, it was ultrasonically cleaned for 10min, rinsed with deionized water for 30s, and then calcined in a muffle furnace at 500°C for 2h. 2°C / min to produce TiO 2 NTs photoelectrodes.

[0047] 2) Add 0.002mol FeSO 4 , 0.004mol NiSO 4 , 0.8 mmol H 3 BO 3 Dissolve 0.5mmol L-histidine in 100mL deionized water, and stir for 15min under nitrogen gas to obtain electrodeposition solution B;

[0048] 3) wherein the titanium dioxide nanometer photoelectrode is used as the working electrode, the platinum electrode is the counter electrode, and the silver / silv...

Embodiment 2

[0052] The difference between this embodiment and Example 1 is that the concentration and ratio of Ni and Fe ions in the electrodeposition solution were changed to 3:1, the time for feeding nitrogen gas was increased from 15 minutes to 20 minutes, and the electrodeposition time was increased from 30s to 50s.

[0053] 1) The titanium foil treated with acetone, ethanol and deionized water is oxidized by a two-electrode system constant voltage method, and the oxidation solution is composed of 95ml ethylene glycol and 5ml deionized water, and 2.5wt% (mixed solution) of ammonium fluoride . Titanium foil and platinum electrode were used as anode and cathode respectively, the oxidation voltage was 50V, and the oxidation time was 1.5h. After oxidation, it was ultrasonically cleaned for 10min, rinsed with deionized water for 30s, and then calcined in a muffle furnace at 500°C for 2h. 2°C / min to produce TiO 2 NTs photoelectrodes.

[0054] 2) Add 0.002mol FeSO 4 , 0.006mol NiSO 4 , ...

Embodiment 3

[0058] The difference between this embodiment and Example 1 is that the concentration and ratio of Ni and Fe ions in the electrodeposition solution are changed to 8:3, and the deposition current density is changed from 1mA cm -2 Change to 2mA cm -2 .

[0059] 1) The titanium foil treated with acetone, ethanol and deionized water was oxidized by a two-electrode system constant voltage, and the oxidation solution was composed of 87ml ethylene glycol, 13ml deionized water, and 3wt% (mixed solution) of ammonium fluoride. Titanium foil and platinum electrode were used as anode and cathode respectively, the oxidation voltage was 50V, and the oxidation time was 1.5h. After oxidation, it was ultrasonically cleaned for 10min, rinsed with deionized water for 30s, and then calcined in a muffle furnace at 500°C for 2h. 2°C / min to produce TiO 2 NTs photoelectrodes.

[0060] 2) Add 0.003mol FeSO 4 , 0.008mol NiSO 4 , 0.8 mmol H 3 BO 3 Dissolve 0.8mmol L-histidine in 100mL deionized ...

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Abstract

The invention discloses a method for simultaneously depositing a nickel-iron modified titanium dioxide nanotube electrode. The method is a green, simple, convenient and efficient preparation method ofa nickel-iron (NiFe) / TiO2 NTs photoelectrode, and the nickel-iron (NiFe) / TiO2 NTs photoelectrode with good photoelectric response and good stability is obtained through a constant current depositionmethod by means of the method. According to the principle, electrons such as Ni<2+> and Fe<2+> in an electro-deposition solution are reduced along the surface of a nanotube to finally obtain a NiFe alloy uniformly distributed from a tube opening to the inside of the tube, so that the nickel-iron (NiFe) / TiO2 NTs composite photoelectrode is obtained, the deposition voltage meets the reduction voltage of iron and nickel at the same time, and one-step co-deposition of Ni metal ions and Fe metal ions is realized. The atomic ratio of the nickel to the iron on the surface of the deposited electrode is basically consistent with the concentration ratio of the ions in the solution, so that the photoelectrochemical performance of the TiO2 NTs photoelectrode is effectively improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of photoelectric catalysis, and in particular relates to a method for simultaneously depositing nickel-iron modified titanium dioxide nanotube electrodes. 【Background technique】 [0002] TiO 2 It is a commonly used photoelectrocatalytic semiconductor material, which has been widely studied because of its good stability, high catalytic efficiency, mild reaction conditions, green and non-toxic. But due to TiO 2 The forbidden band width is 3.2eV, and it can only absorb ultraviolet light with a wavelength of less than 380nm, and its photogenerated electron-hole recombination is serious, which limits its application in the field of photoelectrocatalysis. At present, precious metals such as Pt, Ag, and Au have been deposited on TiO 2 The surface can redistribute the carriers of the composite material, and the electrons can be transferred from TiO with a higher Fermi level 2 Transferred to a metal with a lowe...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/08C25D21/10C25D5/54C25D11/26C25B1/04C25B11/06B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C25B1/04C25D3/56C25D5/08C25D5/54C25D11/26C25D21/10Y02E60/36Y02P20/133
Inventor 邢众航卢若晨金晓丹何凌云陈庆云
Owner XI AN JIAOTONG UNIV
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