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A photocathode comprising a phosphorus-containing compound and its preparation method

A technology of photocathode and composite, applied in the field of material science and photoelectrochemistry, can solve the problems of difficulty and difficult preparation of metal phosphide photocathode, and achieve reduced charge transfer resistance, excellent photocatalytic performance, and good stability Effect

Active Publication Date: 2019-11-08
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a photocathode, it is difficult to control the deposition of high-efficiency catalysts under the premise of not destroying the photoactive material.
To the best of the inventors' knowledge, photocathodes containing metal phosphides have so far been difficult to fabricate due to the aforementioned technical reasons

Method used

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  • A photocathode comprising a phosphorus-containing compound and its preparation method
  • A photocathode comprising a phosphorus-containing compound and its preparation method
  • A photocathode comprising a phosphorus-containing compound and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: FTO / Cu 2 O / Ni x Preparation and Characterization of P Photocathode

[0063] New FTO / Cu 2 O / Ni x Preparation steps of P photocathode:

[0064] (1) Magnetron sputtering Cu on FTO

[0065] Pretreatment of FTO conductive substrate: FTO glass (1×2 cm) was soaked in acetone and absolute ethanol successively, then heated to reflux in 2 M potassium hydroxide in isopropanol solution, and finally deionized water Just wash it. At room temperature, the domestic JGP-450B magnetron sputtering deposition system was used to deposit simple copper thin films on FTO glass. 30 min.

[0066] (2) Preparation of FTO / Cu(OH) by anodic oxidation method 2 Precursor

[0067] Cu(OH) was prepared by anodic oxidation 2 The nanowire precursors, i.e. FTO / Cu as the working electrode, Pt mesh and Ag / AgCl (3 M KCl) as the counter and reference electrodes, respectively, were treated in a potassium hydroxide (3 M) electrolyte solution at a constant current density (10 mA / cm 2 ) were...

Embodiment 2

[0076] Example 2: FTO / Cu 2 O / Ni x P photocathode with FTO / Cu 2 O electrode electrochemical performance comparison

[0077] FTO / Cu 2 Preparation of O photocathode:

[0078] Pretreatment of the FTO conductive substrate: soak the FTO glass (1×2 cm) in acetone and absolute ethanol successively, then heat and reflux in 2 M potassium hydroxide in isopropanol solution, and finally use deionized water Just wash it. At room temperature, the domestic JGP-450B magnetron sputtering deposition system was used to deposit simple copper thin films on FTO glass. 30 min.

[0079] Cu(OH) was prepared by anodic oxidation 2 The nanowire precursors, i.e. FTO / Cu as the working electrode, Pt mesh and Ag / AgCl (3 M KCl) as the counter and reference electrodes, respectively, were treated in a potassium hydroxide (3 M) electrolyte solution at a constant current density (10 mA / cm 2 ) were anodized for 3 minutes. Take out the electrode, rinse it with deionized water, and dry it.

[0080] FTO / Cu...

Embodiment 3

[0083] Example 3: FTO / Cu 2 O / Ni x Electrochemical impedance test of P electrode

[0084] The charge transfer resistance (Rct) in the electrochemical impedance spectroscopy indicates that Cu 2 O / Ni x The value of the transfer resistance between the P catalyst and the proton can be obtained from the diameter of the semicircle in the electrochemical impedance spectrum, and then the prepared FTO / Cu can be investigated. 2 O / Ni x The hydrogen production mechanism of the P electrode.

[0085] Take Na 2 SO 4 and KH 2 PO 4 The mixed solution is used as the electrolyte solution (PH=5), FTO / Cu 2 O / Ni x P is used as the working electrode, the Ag / AgCl electrode is used as the reference electrode, and the platinum grid is used as the counter electrode, and then the electrochemical impedance spectroscopy performance test is performed on the CHI660E electrochemical workstation, and the test results are as follows Figure 5 , it can be seen from the figure that the FTO / Cu 2 O / Ni ...

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Abstract

The invention discloses a photocathode containing a phosphorus-containing compound and a preparation method thereof, and belongs to the technical fields of material science and photoelectrochemistry. The hysteresis problem of the interface reaction between photogenerated electrons and reactants limits the development of stable and efficient photocathode. Controlled deposition of high-efficiency metal phosphide catalysts without destroying photoactive materials has become a feasible way to solve the above problems. The present invention designs a photocathode containing a phosphorus-containing compound, adopts a simple, mild, and low-cost photochemical method to successfully deposit the phosphorus-containing compound on the photoactive material. The obtained photocathode has good stability and use value. In addition, the photochemical preparation method of the composite electrode is not only fast and controllable, but also uses light energy to prepare catalysts which is more environmentally friendly and provides a new path for the large-scale application of photoelectrocatalytic materials.

Description

technical field [0001] The invention relates to a photocathode containing a phosphorus-containing compound and a preparation method thereof, belonging to the technical fields of material science and photoelectrochemistry. Background technique [0002] In the near future, fossil fuel reserves will still dominate global energy demand. However, the burning of fossil fuels leads to the emergence of energy crisis and increasingly serious environmental pollution problems all over the world. The development of sustainable and clean energy is one of the most effective measures to solve the current problems. Facing a variety of sustainable energy sources, hydrogen energy is a sustainable energy source with zero pollution and high energy density. In addition, solar energy is an inexhaustible green energy, and it also has the potential of large-scale application. Photoelectrochemical (PEC) water splitting can use solar energy to produce hydrogen, which is an ideal and efficient metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06
CPCH01M4/9091C25B1/04C01B21/082C01B25/08C01G11/02B01J27/1853B01J27/24C01P2002/82C01P2002/72C01P2004/16C01P2004/01C01P2004/03C01P2004/04C01P2006/40C25B1/55C25B11/051C25B11/091B01J35/33Y02E60/36Y02E60/50
Inventor 董玉明王光丽蒋平平赵云霏孔令刚张会珍
Owner JIANGNAN UNIV