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A kind of tantalum nitride photoanode mediated by lanthanum chloride molten salt and preparation method thereof

A photoanode, molten salt technology, applied in electrodes, manufacturing tools, heat treatment equipment, etc., can solve the problem of no breakthrough progress, and achieve the effect of inhibiting recombination, high crystal quality and excellent performance

Active Publication Date: 2021-05-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method of directly oxidizing and renitriding metal tantalum sheets has had little breakthrough in recent years

Method used

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  • A kind of tantalum nitride photoanode mediated by lanthanum chloride molten salt and preparation method thereof
  • A kind of tantalum nitride photoanode mediated by lanthanum chloride molten salt and preparation method thereof
  • A kind of tantalum nitride photoanode mediated by lanthanum chloride molten salt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] LaCl 3 molten salt mediated Ta 3 N 5 Photoanode preparation.

[0024] 1) Pre-oxidation: first cut the Ta foil into a size of 12 mm × 10 mm, then ultrasonically clean the Ta foil in acetone, ethanol and deionized water, and then anneal at 500 ° C in air for 1 h to form a layer of gray oxidation. layer.

[0025] 2) LaCl 3 Addition of molten salt: Place the oxidized Ta foil in step 1) on the heating plate, then add 0.5M LaCl dropwise with a pipette on the Ta foil 3 Solution 100uL. When the solvent evaporates, a dense, smooth, translucent layer of LaCl is formed. 3 film.

[0026] 3) LaCl 3 molten salt mediated Ta 3 N 5 Preparation of photoanode: heat-treat the precursor in step 2) in an ammonia atmosphere, and keep it at 900°C for 5h to obtain LaCl 3 molten salt mediated Ta 3 N 5 Photoanode, named La-Ta 3 N 5 . The LaCl 3 molten salt mediated Ta 3 N 5 The shape of the photoanode is as figure 1 As shown, the electrode sheet appears as a red light absorber...

Embodiment 2

[0029] LaCl 3 molten salt mediated Ta 3 N 5 Photoanode performance test.

[0030] 1) LaCl obtained in Example 1 3 molten salt mediated Ta 3 N 5 Photoanode, with cobalt oxide (Co 3 o 4 ) is the cocatalyst to Ta 3 N 5 Flat photoanodes were optimized by a modified hydrothermal method at Ta 3 N 5 Hydrothermal deposition of Co on 3 o 4 nanoparticles.

[0031] 2) Photoelectrocatalytic performance test: We used a standard three-electrode system to perform chronoamperometry at a potential of 1.23V vs. RHE under AM 1.5G illumination (1 standard sunlight). Test La-Ta 3 N 5 Photoelectrocatalytic water splitting performance in 1M NaOH solution (supported cocatalyst Co 3 o 4 named La-Ta 3 N 5 -Co). Such as image 3 shown in LaCl 3 With the help of molten salt, La-Ta 3 N 5 The photocurrent reaches 1.7mA cm -2 . In addition, at load Co 3 o 4 After cocatalyst, La-Ta 3 N 5 -Co photoanode reaches 8.2mAcm -2 .

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Abstract

The invention discloses a LaCl 3 molten salt mediated Ta 3 N 5 Photoanode and method for its preparation. The present invention is in low dosage LaCl 3 With the assistance of molten salt, LaCl was prepared by the traditional facile direct oxidation and nitrided Ta foil method. 3 molten salt mediated Ta 3 N 5 photoanode, which has successfully enhanced its performance for photocatalytic water splitting. The Ta 3 N 5 The photoanode has stronger absorption in the solar spectrum, and has high-efficiency photocatalytic water splitting activity. The performance improvement comes from the La element doping on the surface and LaTaON 2 Phase formation. The method of the invention has simple equipment, is easy to operate, has good photoanode crystal quality and stable performance, and is favorable for large-scale popularization and application. LaCl 3 The introduction of molten salt has brought a new look to the traditional preparation method and provided a new method for large-area, low-cost and high-efficiency photoanodes.

Description

technical field [0001] The invention belongs to the field of photoelectric catalysis, in particular to a LaCl 3 molten salt mediated Ta 3 N 5 Photoanode and method for its preparation. Background technique [0002] Photoelectrochemical (PEC) water splitting, as a strategy to convert solar energy into chemical energy in the form of hydrogen and oxygen, has attracted extensive attention, providing a feasible technological route for the development of renewable energy. Among them 3 N 5 It is a promising candidate material due to its band structure well-matched to the hydrogen and oxygen evolution potential, sufficient light absorption (~2.1eV), low cost, and environmental friendliness. However, surface / bulk defects and carrier recombination limit their performance. [0003] In a recent study, Ta 3 N 5 The photoanode is mainly composed of anodized Ta 2 o 5 Nanotubes, deposited Ta 2 o 5 Nanorods or alkali metal tantalates were nitrided, and a gratifying photocurrent w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/55C25B11/042C25B11/067C25B11/077C22F1/18C21D9/46C22F1/02C25B1/04
CPCC21D9/46C22F1/02C22F1/18C25B1/04C25B1/55C25B11/091Y02E60/36
Inventor 朱丽萍楼子瑞覃超梁容
Owner ZHEJIANG UNIV
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