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Method for preparing hydrogen through photoanode-photovoltaic battery coupled dual-illumination fully-photic-driven decomposition of water

A photovoltaic cell and photoanode technology, applied in the direction of electrolysis process, electrolysis components, photosensitive equipment, etc., can solve the problems of narrow light absorption range, difficulty in realization, limitation, etc., achieve a wide range of material selection, improve water oxidation activity, and material preparation easy effect

Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0003] The photocatalytic water splitting technology of the powder system has been developed for decades. At present, there are not many systems that can achieve water splitting under visible light. At present, the two systems with the highest quantum efficiency of visible light catalytic water splitting include Rh-Cr reported by the Domen group. 2 o 3-x / GaN:ZnO catalyst quantum efficiency 5.2% at 400nm wavelength and Pt / ZrO 2 / TaON-Pt / WO 3 The quantum efficiency of the Z-Schem system at 420nm wavelength is 6.3% (Nature, 2006, 440, 295. and J.Am.Chem.Soc.2010, 132, 5858.), according to the corresponding solar energy utilization efficiency is less than 1%;
The addition of an external bias voltage can significantly promote the separation of carriers and increase the photocurrent, but it also consumes electrical energy, so the solar energy utilization efficiency of the photocatalytic water splitting system is relatively low. The highest solar energy utilization efficiency reported in the literature is less than 2 %
However, the research of directly adding photovoltaic cells to the external circuit of the photolytic cell is similar to the photovoltaic cell power generation coupling electrolysis technology. The device consists of two parts, which are relatively complicated, and involve the packaging of solar cells and the connection and matching between the two. question
[0010] E.L.Miller et al. (International Journal of Hydrogen Energy, 2003, 28, 615-623.) deposit a layer of WO on the positive side of multi-junction solid silicon cells and GIS photovoltaic cells 3 or Fe 2 o 3 , a hydrogen-desorption catalyst is deposited on the negative electrode side, and a monolithic composite multi-node structure photoelectrode is constructed; where WO 3 Combined with a 1.5V dual-cell battery, the estimated maximum STH is 3.1%, mainly limited by WO 3 Absorption range is too narrow; Fe 2 o 3 Combined with three batteries above 1.85V, the corresponding limit STH is 9.2%, but Fe 2 o 3 The current of the layer must match the current of each of the three batteries, which is very difficult to achieve
Alex Stavrides et al. (Proc.of SPIE, 2006, 6340, 63400K) utilize polysilicon cell, deposit a layer of WO on it 3 , constitute stainless steel / ni2pnilp / ZnO / WO 3 The composite structure of SiC:H and Si battery monolithic composite structure (a-Si / a-Si or a-Si / nc-Si) / a-SiC:H(p) / a-SiC:H(i), and according to the intersection point of the I-V curve of the Si battery and the I-V curve of the photoanode material three-electrode system, the operating point of the device Analysis was performed and it was predicted that STH could reach 3% and 10%, respectively, but this prediction using the I-V curve of the three-electrode system was inaccurate
Moreover, although the composite photoelectrode with monolithic structure can effectively increase the light absorption, its overall efficiency is still limited by the photoelectric properties of semiconductor materials, WO 3 or Fe 2 o 3 The position of the conduction band should be more than 0.4V negative to the potential of the hydrogen-producing electrode, plus the overpotential of oxygen release, so the external voltage is relatively large, and multiple batteries are required, and the corresponding preparation process of the entire device requires higher requirements.
In addition, this monolithic photoelectrode can produce H 2 Produced on the back 2 , although the two are separated, it is difficult to achieve H in practical applications 2 / O 2 gas separation

Method used

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  • Method for preparing hydrogen through photoanode-photovoltaic battery coupled dual-illumination fully-photic-driven decomposition of water
  • Method for preparing hydrogen through photoanode-photovoltaic battery coupled dual-illumination fully-photic-driven decomposition of water
  • Method for preparing hydrogen through photoanode-photovoltaic battery coupled dual-illumination fully-photic-driven decomposition of water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 0.3% Mo-doped BiVO 4 Preparation and photoelectric characterization of the photoanode:

[0068] 202mL water plus 11mL concentrated HNO 3 , weighing 8.75mmol VOSO 4 .xH 2 O was dissolved in the above solution, and 1.2133g Bi(NO 3 ) 3 .5H 2 O, add 0.02625mmol MoCl after dissolving 3 or MoCl 5 , 52g of anhydrous sodium acetate to adjust the pH to about 5.1, and then add nitric acid to adjust the pH to 4.7. The above solution was used as electrolyte, Pt sheet was used as counter electrode, FTO was used as working electrode, and saturated calomel electrode SCE was used as reference electrode. Under the condition of constant temperature in 70°C water bath, CHI760D electrochemical workstation was used to control the potential of 1.855Vvs. Take it out for cleaning after 50 minutes, bake it in the air at 500°C, the heating rate is 2°C / min, and finally soak it in 1M KOH for 15 minutes to remove V 2 o 5 Impurities. Mo:BiVO 4 The results of the XRD spectrum of the photo...

Embodiment 2

[0071] Mo:BiVO 4 Loading of Surface Promoter FeOOH

[0072] Take 35mL of secondary water and pass it through Ar for 30min to remove the dissolved air, and then use it to prepare 0.1M FeCl 2 Solution, adjust pH to 4.1 with ammonia water, select current step deposition, current density 10μA / cm 2 Deposition 3s, 1μA / cm 2 Deposition 2s, light source Xe lamp (light intensity to 2mW / cm 2 ), the deposition voltage will first decrease and then increase with the increase of the deposition amount. 4 SEM of the photoanode as image 3 .

Embodiment 3

[0074] Mo:BiVO 4 Surface Promoter CoB i load

[0075] Configured with 30μM Co(NO 3 ) 2 0.1M sodium borate buffer solution (pH9), with 300W Xe lamp (λ>420nm) as the light source, with Mo:BiVO 4 is the photoanode, the Pt sheet is the counter electrode, the saturated calomel electrode SCE is the reference electrode, and the deposition is carried out at a constant potential of 0Vvs.SCE, and the deposition time is 10s.

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Abstract

The invention relates to a method for preparing hydrogen through photoanode-photovoltaic battery coupled dual-illumination fully-photic-driven decomposition of water. Efficient decomposition of water is realized under sunlight illumination conditions by using coupling of a photoelectrocatalysis technology with a photovoltaic battery technology, adopting a water oxidation cocatalsyt modified semiconductor material as a photoanode, placing a proton reduction cocatalyst modified Si battery in an electrolyte as a photocathode, directly connecting the positive electrode of the Si battery with the anode through a lead and allowing the surface of the cathode to contact with the electrolyte. The method realizes fully photic driven decomposition of water without applied bias conditions, and the solar energy utilization efficiency STH of the method reaches 2.2% or above.

Description

1. Technical field [0001] The invention relates to a photoanode-photovoltaic cell coupled double-irradiation complete light-driven method for decomposing water to produce hydrogen. Specifically, the construction of a two-electrode form light-driven water splitting system including semiconductor photoanode and Si cell photocathode coupling and the corresponding BiVO 4 Preparation and modification method of photoanode, modification treatment method of Si battery photocathode. 2. Background technology [0002] Energy and environmental issues are two major issues facing the survival and sustainable development of human society. Using solar energy to produce clean and high-combustion hydrogen energy is a potential ideal way to solve these two problems. The most common and effective way of solar-chemical energy conversion is to use the photogenerated holes and electrons generated by semiconductors to absorb light energy to be used for water oxidation and reduction half-reactions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04H01G9/20
CPCC25B1/04C25B1/55H01G9/20Y02E60/36Y02P20/133
Inventor 李灿丁春梅秦炜王楠王志亮施晶莹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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