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Cobalt-lanthanum co-doped visible light response BiVO4 photoelectrode and preparation method thereof

A visible light and photoelectrode technology, applied in electrodes, electrolytic components, electrolytic processes, etc., can solve the problems of easy recombination of photogenerated electrons and holes, slow kinetic rate of oxygen release, poor photocatalytic water oxidation activity, etc., to achieve wide light Effects of absorption range, improvement of photoelectric catalytic performance, and enhancement of light absorption performance

Pending Publication Date: 2022-04-29
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

However, BiVO 4 Due to some problems existing in photocatalytic materials, the actual photoelectric conversion efficiency is still far lower than its theoretical value, which limits its practical application. There are the following problems: (1) BiVO 4 The charge migration in the material, especially the electron migration rate is very slow, resulting in about 60%-80% recombination of the generated charge carriers before reaching the surface of the material; (2) compared with the oxidation of sulfite reaction, which releases oxygen at a very slow kinetic rate
[0004] For BiVO 4 The photocatalytic water oxidation activity of the photoanode is poor, and the photogenerated electrons and holes are easy to recombine. At the same time, the accumulation of holes generated inside and at the interface of the photoanode often leads to the photocorrosion of the photocatalyst. Co-doping with cobaltum and lanthanum is proposed to improve BiVO 4 The spectral response range of the photoanode, adjust its energy band structure, and enhance the visible light-responsive photoelectrochemical activity of the material

Method used

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  • Cobalt-lanthanum co-doped visible light response BiVO4 photoelectrode and preparation method thereof
  • Cobalt-lanthanum co-doped visible light response BiVO4 photoelectrode and preparation method thereof
  • Cobalt-lanthanum co-doped visible light response BiVO4 photoelectrode and preparation method thereof

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Experimental program
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preparation example Construction

[0040] Co / La-BiVO 4 The preparation method of photoelectrode thin film, comprises the steps:

[0041] Step 1, prepare potassium iodide KI, bismuth nitrate pentahydrate Bi(NO 3 ) 3 ·5H 2 O, nitric acid HNO 3 The mixed aqueous solution of p-benzoquinone-ethanol solution is added dropwise, fully stirred, and is mixed with precursor solution 1;

[0042] Step 2. Precursor solution 1 is used as the electrolyte, and a three-electrode system is adopted, with fluorine-doped tin dioxide (FTO) transparent conductive glass as the working electrode, a platinum Pt sheet electrode as the counter electrode, and a saturated calomel electrode as the reference electrode , Electrodeposition is carried out at the relative reference electrode potential to prepare the precursor bismuth oxygen iodine BiOI thin film electrode;

[0043] Step 3, vanadyl acetylacetonate VO (acac) 2 Dissolve in DMSO as vanadium source, add cobalt source and lanthanum source to it, mix well, and prepare precursor sol...

Embodiment 1

[0053] Embodiment 1: 6.64g KI is dissolved in 100ml ultrapure water, adds concentrated nitric acid and pH is adjusted to 1.75, then adds 1.94g Bi(NO 3 ) 3 ·5H 2 O, stir for 30-60min, then add 20ml of 50mM p-benzoquinone-ethanol solution, stir for 10-20min;

[0054] A three-electrode system was used for electrodeposition, with FTO transparent conductive glass as the working electrode, a Pt sheet electrode as the counter electrode, and a saturated calomel electrode as the reference electrode. Electrodeposition was performed for 10 minutes at a potential of -0.143V relative to the saturated calomel electrode. Prepare BiOI thin film electrodes;

[0055] 0.1g VO(acac) 2 Dissolve in 2mL DMSO as the vanadium source, and add 0.7% cobalt acetylacetonate and 0.3% lanthanum acetylacetonate to it, pipette the vanadium source and coat it evenly on the BiOI thin film electrode, and dry it at 60°C;

[0056] Calcined at 450°C for 2h in a muffle furnace at a heating rate of 3°C / min;

[00...

Embodiment 2

[0065] Embodiment 2: 6.64g potassium nitrate KI is dissolved in 100mL ultrapure water, adds concentrated nitric acid and pH is adjusted to 1.75, then adds 1.94g bismuth nitrate pentahydrate Bi (NO 3 ) 3 ·5H 2 O, stir for 30-60min, then add 20mL of 50mmol / L p-benzoquinone-ethanol solution, stir for 10-20min;

[0066] A three-electrode system is used for electrodeposition, with fluorine-doped tin oxide FTO conductive glass as the working electrode, the Pt sheet electrode as the counter electrode, and the saturated calomel electrode as the reference electrode, at a potential of -0.143V relative to the saturated calomel electrode , electrodeposited for 15min to prepare bismuth oxygen iodine BiOI thin film electrode;

[0067] 0.1g vanadyl acetylacetonate VO (acac) 2 Dissolve in 2mL dimethyl sulfoxide DMSO as the vanadium source, and add 0.5% cobalt acetylacetonate and 0.5% lanthanum acetylacetonate to it, pipette the vanadium source and evenly coat it on the BiOI thin film elect...

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Abstract

The invention discloses a cobalt-lanthanum co-doped visible-light response BiVO4 photoelectrode and a preparation method thereof, and belongs to the field of nano functional materials. The method comprises the following steps: 1) adding p-benzoquinone and ethanol into an aqueous solution dissolved with potassium iodide and bismuth nitrate, and fully stirring; 2) taking the solution as an electrolyte, carrying out electro-deposition for 5-15 minutes, and depositing on a conductive substrate to obtain a bismuth oxyiodide (BiOI) film; 3) dissolving vanadyl acetylacetonate in dimethyl sulfoxide, adding a proper amount of cobalt source and lanthanum source, and uniformly stirring and mixing; (4) transferring the dimethyl sulfoxide solution mixed with the vanadium source, the cobalt source and the lanthanum source, and uniformly coating a bismuth oxyiodide (BiOI) film with the dimethyl sulfoxide solution; 5) transferring into a muffle furnace, and calcining for 1-2 hours at the temperature of 400-550 DEG C; and (6) taking out a sample, soaking the sample in a sodium hydroxide solution for 30-60 minutes, cleaning and drying to obtain the cobalt-lanthanum co-doped bismuth vanadate (Co / La-BiVO4) nano-porous electrode. The preparation method has the advantages that the visible light response of the BiVO4 film can be effectively enhanced through co-doping of cobalt and lanthanum elements, and better photoelectrochemical hydrogen production performance is obtained.

Description

technical field [0001] The invention relates to the field of nano functional materials, in particular to a co-doped co-doped visible light responsive BiVO 4 Photoelectrode and its preparation method. Background technique [0002] As an emerging renewable energy, solar energy has become one of the preferred alternative energy sources to solve the problems of energy shortage and environmental pollution. However, how to use solar energy efficiently has become the focus and difficulty of current research. Hydrogen production by photoelectrochemical water splitting (PEC) is one of the best strategies for the effective utilization of solar energy, which can effectively reduce energy consumption and reduce the possibility of by-products and secondary pollution. [0003] Bismuth vanadate BiVO 4 It is a semiconductor material with a forbidden band width of about 2.4e V and a strong visible light absorption capacity, and its theoretical maximum photocurrent can reach 7.5mAcm -2 , t...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B1/55C25B11/031C25B11/049
CPCC25B1/04C25B1/55C25B11/031C25B11/049
Inventor 顾修全耿会敏应鹏展孔丹
Owner CHINA UNIV OF MINING & TECH
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