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Preparation method and application of efficient photoelectrocatalytic water-decomposition oxygen-production electrode

A photoelectric catalysis, oxygen electrode technology, applied in electrodes, electrolysis components, electrolysis processes, etc., can solve the problems of unobtainable performance, excellent photoelectrochemical water splitting composite electrodes, high cost and scarcity of precious metals that limit large-scale applications, etc. Good electrocatalytic activity, effective separation, good light transmittance

Active Publication Date: 2017-02-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high cost and scarcity of noble metals limit their large-scale application in oxygen production
Moreover, more importantly, the RuO 2 or IrO 2 with BiVO 4 Composite assembly cannot obtain a photoelectrochemical water splitting composite electrode with excellent performance

Method used

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  • Preparation method and application of efficient photoelectrocatalytic water-decomposition oxygen-production electrode
  • Preparation method and application of efficient photoelectrocatalytic water-decomposition oxygen-production electrode
  • Preparation method and application of efficient photoelectrocatalytic water-decomposition oxygen-production electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The geometric area is 0.2826 cm 2 Graphite flakes (0.6 cm in diameter and 0.1 cm in thickness) were ultrasonically cleaned with deionized water, absolute ethanol and acetone for 30 minutes to remove organic matter on the surface. Placed in an oven, dried at 40°C for 12 hours, ready for use, the morphology picture of the blank graphite sheet obtained by scanning electron microscope is as follows: Picture 1-1 shown. Fix the dried graphite sheet on the bottom of the electrode rod (polytetrafluoroethylene shell with conductive copper rod inside) with conductive silver glue, as an electrode.

[0039] Graphite electrode was used as working electrode, stone grinding rod was used as counter electrode, and mercurous sulfate electrode was used as reference electrode. The electrodeposition solution is composed of cobalt nitrate and ferric nitrate, both of which have a concentration of 6 mmol / L. The volume of the electrodeposition solution was 70 mL. Before the start of the elec...

Embodiment 2

[0042] Referring to the electrodeposition method of Example 1, ITO conductive glass (5cm*2cm) was used as the working electrode, Pt sheet (1cm*1cm) was used as the counter electrode, and the mercurous sulfate electrode was used as the reference electrode. The conditions of the electrodeposition solution were the same as in Example 1. The same, different deposition time (0-300s), in which the area of ​​ITO immersion electrolyte is 2cm*2cm. The prepared CoFe-H / ITO electrode was then rinsed with a large amount of ultrapure water, and placed in a vacuum oven at 30°C for 12 hours to dry.

[0043] The prepared CoFe-H / ITO samples with different deposition times were measured with a UV-spectrophotometer (UV-3150 UV-Vis) for their light transmittance, and the scanning range was 300-800nm. The transmittance data of samples with different deposition times are as follows: figure 2 . As the deposition time prolongs, the color of the sample gradually becomes darker and the light transmitt...

Embodiment 3

[0045] Firstly, the BiVO 4 Nanoporous film deposited onto the surface of fluorine-doped conductive glass to fabricate BiVO 4 / FTO photoelectrode, typical BiVO 4 The scanning electron microscope picture of the three-dimensional porous nano-membrane electrode is as follows: Figure 3-1 ;

[0046] The two-step method of electrodeposition and calcination is as follows: prepare a three-dimensional porous bismuth vanadate nanofilm substrate on the surface of FTO: first prepare a molar concentration of 0.04mol / L Bi(NO 3 ) 3 and 0.4 mol / L KI mixed solution 50mL, then use concentrated nitric acid to adjust the pH of the solution to about 1.7, then prepare 20mL p-benzoquinone ethanol solution with a molar concentration of 0.23mol / L, and finally mix the above two solutions and stir vigorously for 5 minute. Then, a three-electrode system was used for constant potential deposition, with a platinum sheet as the counter electrode, Ag / AgCl (saturated potassium chloride solution) as the r...

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Abstract

The invention discloses a preparation method and application of an efficient photoelectrocatalytic water-decomposition oxygen-production electrode. According to the preparation method, with a three-dimensional porous pucherite nanofilm as a substrate, a ferrocobalt hydroxide / pucherite (CoFe-H / BiVO4) composite catalytic photoanode is prepared through an electrochemical deposition method. The amorphous catalyst CoFe-H shows excellent electrochemical catalysis oxygen-production performance (the Tafel value is about 28 mV / decade) and good light transmission. The CoFe-H / BiVO4 composite photoanode prepared through the method has a high-quality catalyst / semiconductor interface, so that the capacity to absorb visible light is enhanced to a great extent, and effective generation and efficient utilization of photon-generated carriers are achieved. Under the 100 mw / cm<2> sunlight simulation condition, the light current density of the CoFe-H / BiVO4 composite photoanode can reach 2.48 mA / cm<2> under 1.23 V. Meanwhile, the preparation method of the composite photoanode is simple, efficient and environmentally friendly, the raw material cost and the synthesis cost are low, and the preparation method is suitable for industrial application of photoelectrocatalytic water-decomposition oxygen production and has broad scientific significance.

Description

technical field [0001] The invention relates to the technical field of photoelectric catalytic water splitting, in particular to a preparation method and application of an efficient photoelectric catalytic splitting water oxygen production electrode. Background technique [0002] With the global consumption of non-renewable energy such as coal and oil, the future energy crisis is a problem that mankind must face. Therefore, it is imminent to develop and utilize green and sustainable new energy sources (such as solar energy, wind energy, nuclear energy, biomass energy, etc.) and increase their proportion in the entire energy structure. Among the many new energy sources, solar energy has attracted more and more attention due to its advantages of abundant resources, free use and no transportation, and no environmental pollution. Although the total amount of solar energy resources is equivalent to more than 10,000 times the current energy used by human beings, it has the disadv...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/04C25B11/06C25D9/04C25D3/56
CPCC25B1/04C25D3/562C25D9/04C25B1/55C25B11/057C25B11/091Y02E60/36
Inventor 张兴旺刘伟刘虎雷乐成
Owner ZHEJIANG UNIV
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