Preparation method for producing hydrogen electrode through efficient photoelectrocatalysis and application thereof

A photoelectric catalysis and hydrogen electrode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of high production cost and low efficiency, achieve good light transmission, simplify the process flow, and mild reaction conditions

Inactive Publication Date: 2017-01-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at the problems of low efficiency and high production cost in photoelectrocatalytic hydrogen production, this patent intends to sol

Method used

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  • Preparation method for producing hydrogen electrode through efficient photoelectrocatalysis and application thereof
  • Preparation method for producing hydrogen electrode through efficient photoelectrocatalysis and application thereof
  • Preparation method for producing hydrogen electrode through efficient photoelectrocatalysis and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Set the geometric area to 0.2826 cm 2 The graphite flakes (diameter 0.6cm, thickness 0.1cm) were washed with deionized water, absolute ethanol and acetone for 30 minutes in order to remove organic matter on the surface. Placed in an oven, dried for 12 hours at 40 degrees, ready for use. The morphological picture of the blank graphite sheet obtained by scanning electron microscope is as follows Picture 1-1 Shown. The surface of the blank graphite sheet is composed of irregular flake graphite. Fix the dried graphite sheet with conductive silver glue on the bottom of the electrode rod (a PTFE shell with a conductive copper rod inside) as an electrode.

[0040] Graphite electrode is used as working electrode, Pt wire is used as counter electrode, and saturated calomel electrode is used as reference electrode. Electrolyte mother liquor is made of NiCl 2 • 6H 2 O, CoCl 2 • 6H 2 O, SeO 2 And KCl, the concentrations of which are 10 mmol / L, 10 mmol / L, 10 mmol / L and 50 mmol / L, resp...

Embodiment 2

[0043] Refer to the electrodeposition method in Example 1, using ITO conductive glass (5cm*2cm) as the working electrode, Pt sheet (1cm*1cm) as the counter electrode, and saturated calomel electrode as the reference electrode. The electrodeposition solution conditions are the same as those in Example 1. The same, the deposition time (0-180s) respectively, where the area of ​​ITO immersed in the electrolyte is 2cm*2cm. NiCoSe prepared x / ITO electrode is rinsed with a large amount of ultrapure water, and placed in a vacuum oven at 30 degrees to dry for 12 hours.

[0044] NiCoSe with different deposition time x The light transmittance of the ITO sample is measured with a UV-spectrophotometer (UV-3150 UV-Vis), and the scanning range is 400-1200nm. The light transmittance data of samples with different deposition times are as follows figure 2 . It can be seen from the figure that as the deposition time increases, the color of the sample gradually becomes darker and the light transm...

Embodiment 3

[0046] Using cesium chloride nano-etching technology, monocrystalline silicon (P-type, boron-doped, (100) crystal plane) is prepared into p-Si nano-pillar arrays. The scanning electron microscope picture of a typical P-Si nano-pillar array is as follows Figure 3-1 , The column height is 1um, the average column diameter is 200nm, and the column spacing is 50-80nm.

[0047] Measure the reflectance with an ultraviolet-spectrophotometer (UV-3150 UV-Vis), and the scanning range is 400-1200nm. The reflectivity of intrinsic p-Si nanopillars varies with wavelength data as Figure 3-2 . Compared with planar p-Si, p-Si nanopillars show good light absorption properties.

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Abstract

The invention discloses a preparation method for producing a hydrogen electrode through efficient photoelectrocatalysis and an application thereof. According to the method, three-dimensional silicon nano pillars are used as a substrate, and the photo assisted-electrochemical deposition method is used for preparing a core-shell p-Si/NiCoSex nano pillar photocathode. Unformed NiCoSex shows excellent electrochemical catalysis hydrogen production performance (the Tafel value is about 39 mV/decade) and good transmission of light. The p-Si/NiCoSex nano pillar array photocathode prepared through the method enhances absorption of visible light and generation and utilization of a photon-generated carrier to a great extent. Under the condition of 100mW/cm<2> simulated sunlight, the light current density under the condition of 0 V(vs.RHE) is -37.5 mA/cm<2> which is the currently-reported highest value of the photocathode using p-Si as the substrate. The synthetic method is simple and efficient, environmentally friendly and capable of being popularized to synthesis of other transition metal chalcogenides, thereby being of 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 a high-efficiency photoelectric catalytic hydrogen production electrode based on a p-type semiconductor substrate and a transition metal catalyst. Background technique [0002] In response to the increasingly serious global climate change and energy crisis, people have been looking for new energy sources that can replace conventional energy sources such as coal and oil. Due to its high energy density and no pollution to the environment, hydrogen is widely regarded as the most potential alternative energy source. Solar energy is generally readily available, green and harmless, and has the incomparable advantages of conventional energy sources. It is a recyclable natural energy source. The principle of photolysis of water to produce hydrogen is to absorb sunlight through a suitable semiconductor photocatalyst to ge...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/10B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C25B1/04C25B1/55C25B11/051C25B11/059C25B11/075Y02E60/36
Inventor 张兴旺张红秀雷乐成
Owner ZHEJIANG UNIV
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