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CoP/CdS composite photocatalyst as well as preparation and application thereof

A catalyst and composite light technology, applied in the direction of physical/chemical process catalysts, hydrogen/synthesis gas production, chemical instruments and methods, etc., can solve the problems of high price, increased cost of photocatalytic water splitting, and low reserves of precious metal materials, etc., to achieve The preparation method is simple and easy, and the effect of high photocatalytic water splitting hydrogen production activity

Active Publication Date: 2016-08-17
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used co-catalysts are noble metals and their compounds, but due to the low reserves and high prices of noble metal materials, this greatly increases the cost of photocatalytic water splitting.

Method used

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  • CoP/CdS composite photocatalyst as well as preparation and application thereof
  • CoP/CdS composite photocatalyst as well as preparation and application thereof
  • CoP/CdS composite photocatalyst as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of CoP precursor: weigh 2.18g Co(NO 3 ) 2 ·6H 2 O, 1.35g urea, 1.17g NaCl, measure 0.25mL surfactant PEG, add 75mL deionized water, then heat in a 70°C water bath for 30min while stirring, then transfer to a 100mL autoclave, react at 120°C for 5h, Naturally cool to room temperature, wash with deionized water and ethanol, and finally put it in an oven to dry at 80°C, take it out and grind it.

[0024] From figure 1 It can be seen that the CoP precursor is needle-shaped.

[0025] Preparation of CoP: The above precursor and sodium hypophosphite were weighed according to the molar ratio of Co:P of 1:5, placed in two porcelain boats respectively, and phosphating in a tube furnace at 300°C for 2h under a nitrogen atmosphere. Cool to room temperature under the protection of nitrogen, and then passivate it with passivation gas (nitrogen containing 1% V / V oxygen) to obtain CoP.

[0026] From figure 2 It can be seen that the needle-like structure is severely da...

Embodiment 2

[0031] Similar to Example 1, the point of difference from Example 1 is that the loading amount of CoP is different.

[0032] From image 3 It can be seen that the hydrogen production activity of CdS of CoP is significantly increased. When the loading amount was 2%, the photocatalytic hydrogen production activity of CoP / CdS was the best. Below or above 2%, the hydrogen production activity will decrease.

Embodiment 3

[0034] Same as Example 1, the difference from Example 1 is that the co-catalyst is noble metal Pt, and its loading amount is 2%.

[0035] From Figure 4 It can be seen that the photocatalytic hydrogen production activity of CdS can be significantly improved by loading CoP and Pt (supported by photodeposition reduction method), and the photocatalytic hydrogen production activity of CoP / CdS is twice that of Pt / CdS.

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Abstract

The invention relates to preparation of a non-noble metal cocatalyst CoP, in particular to a study on properties of a CoP / CdS composite photocatalyst on photocatalytic decomposition of hydrogen from water. The CoP / CdS composite photocatalyst is formed by supporting the cocatalyst CoP on CdS according to a certain proportion. The preparation comprises the following specific steps: (1) synthesizing a CoP precursor, (2) phosphorizing the CoP precursor synthesized in the step (1), and (3) compounding CoP and CdS through a coprecipitation method. The CoP / CdS composite photocatalyst disclosed by the invention has higher photocatalytic decomposition activity of hydrogen from water, wherein the photocatalytic activity of the CdS / CoP composite photocatalyst is 7 times more than that of pure CdS when the optimum load is supported.

Description

technical field [0001] The invention relates to the preparation of a CoP / CdS composite photocatalyst and the research on its photocatalytic hydrogen production performance, which belongs to the technology of utilizing solar photocatalysis to decompose water to produce hydrogen. Background technique [0002] The energy crisis and related environmental problems caused by the consumption of fossil fuels are increasingly threatening the survival and development of human beings. There is an urgent need to develop clean and renewable new energy sources to replace fossil energy sources, and hydrogen energy is considered to be an ideal substitute for fossil fuels. Using solar photocatalytic water splitting to produce hydrogen can effectively solve the above problems. [0003] The co-catalyst plays a very important role in the photocatalytic water splitting: (1) the co-catalyst can reduce the activation energy of hydrogen or oxygen production on the surface of the photocatalyst; (3...

Claims

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Application Information

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IPC IPC(8): B01J27/185C01B3/04
CPCC01B3/042B01J27/1853C01B2203/1052C01B2203/0277B01J35/39Y02E60/36
Inventor 马保军刘红霞林克英刘万毅
Owner NINGXIA UNIVERSITY
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