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NiO/CdSe/MoS2 laminar composite photocathode and preparation method thereof

A photocathode, composite technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., to achieve the effect of facilitating electron transmission, shortening distance, and simple and easy preparation method

Inactive Publication Date: 2015-04-08
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a half-reaction for hydrogen production, the construction of efficient, low-cost, and stable photocathode still faces great challenges

Method used

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  • NiO/CdSe/MoS2 laminar composite photocathode and preparation method thereof
  • NiO/CdSe/MoS2 laminar composite photocathode and preparation method thereof
  • NiO/CdSe/MoS2 laminar composite photocathode and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. The preparation method of the new photocathode CdSe / NiO electrode is specifically prepared according to the following steps:

[0031] (1) Surface pretreatment of ITO conductive glass:

[0032] Soak the pretreated ITO conductive glass in absolute ethanol and acetone for two hours, and then heat and reflux in 2mol / L potassium hydroxide solution of isopropanol for 15 minutes.

[0033] (2) Preparation of NiO thin film by hydrothermal method

[0034] Put the ITO glass into 0.25mol / L Ni(NO 3 ) 2 ·6H 2 In a mixed aqueous solution of O and 0.25mol / L hexamethylenetetramine, heat at 100°C for 12min, take it out, wash it with deionized water five times, dry it in the air, and place it in a muffle furnace for calcination at 300°C for 30min to obtain NiO / ITO electrode.

[0035] (3) Preparation of cadmium selenide (CdSe) sensitized NiO composite electrode by ion alternating adsorption method

[0036] Immerse the ITO / NiO electrodes sequentially in 0.03mol / LCd 2+ and 0.03mol...

Embodiment 2

[0042] 1. Using MoS 2 As a co-catalyst supported on the surface of CdSe / NiO electrode, a more efficient photocathode MoS is prepared 2 / CdSe / NiO, specifically prepared according to the following steps:

[0043] (1) Surface pretreatment of ITO conductive glass:

[0044] Soak the pretreated ITO conductive glass in absolute ethanol and acetone for two hours, and then heat and reflux in 2mol / L potassium hydroxide solution of isopropanol for 15 minutes.

[0045] (2) Preparation of NiO thin film by hydrothermal method

[0046] Put the ITO glass into 0.25mol / L Ni(NO 3 ) 2 ·6H 2 In a mixed aqueous solution of O and 0.25mol / L hexamethylenetetramine, heat at 100°C for 12min, take it out, wash it with deionized water five times, dry it in the air, and place it in a muffle furnace for calcination at 300°C for 30min to obtain NiO / ITO electrode.

[0047] (3) Preparation of cadmium selenide (CdSe) sensitized NiO composite electrode by ion alternating adsorption method

[0048] Immer...

Embodiment 3

[0056] Layered Composite Photocathode NiO / CdSe and NiO / CdSe / MoS 2 Comparison of photoelectric hydrogen production performance under different conditions and the proposed photocatalytic hydrogen production mechanism.

[0057] A mixed aqueous solution (pH=6) of 0.30mol / L hexamethylenetetramine, 0.10mol / L hydrochloric acid and 0.20mol / L potassium chloride was used as the electrolyte solution, a 300W xenon lamp was used as the simulated light source, and Ag / AgCl electrodes were used as Reference electrode, platinum mesh as counter electrode, as-prepared CdSe / NiO and MoS 2 The / CdSe / NiO electrode was used as the working electrode, and the photoelectric hydrogen production experiment was done on the CHI600D electrochemical instrument. The amount of photocatalytic hydrogen production was detected by gas chromatography with a thermal conductivity detector. The composite photocathode CdSe / NiO and MoS of the present invention 2 / CdSe / NiO photoelectric hydrogen production performance ...

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Abstract

The invention discloses a NiO / CdSe / MoS2 laminar composite photocathode and a preparation method thereof. The preparation method comprises the following steps: (1) with ITO conductive glass as a base, preparing a uniform and consistent nickel oxide layer employing a hydrothermal process; (2) loading cadmium selenide on the surface of nickel oxide by adopting an ion alternate adsorption method; and (3) with a NiO / CdSe electrode as a cathode, and (NH4)2[MoS4] as a deposition liquid, depositing MoS2 particles on the surface of the NiO / CdSe electrode by adopting a light-assisted potentiostatic deposition method, so as to obtain a MoS2-modified electrode. According to the method for preparing the photocathode, the amounts of an absorption agent and a cocatalyst are controllable; and under visible light irradiation, the composite photocathode shows good photoelectrocatalytic activity and visible light response characteristics, is stable in performance, and can be effectively applied to the field of photoelectrocatalysis of water decomposition to produce hydrogen.

Description

technical field [0001] The invention relates to the technical field of semiconductor photocatalytic decomposition of water to produce hydrogen, in particular to a layered composite electrode and a preparation method thereof. Background technique [0002] As a future energy carrier, hydrogen has received extensive attention due to its clean nature. One of the efficient and potential hydrogen production methods is photoelectric water splitting to produce hydrogen, which can capture and store solar energy in the simplest chemical bond (H 2 ) without any unwanted contaminants. The photoelectric device is composed of two different electrodes: a photoanode and a photocathode, which respectively undergo oxidation and reduction reactions of water. As a half-reaction for hydrogen production, the construction of highly efficient, low-cost, and stable photocathode still faces great challenges. [0003] As a P-type semiconductor that transfers holes, NiO has a wide band gap, good the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/04
CPCY02E60/36
Inventor 董玉明陈艳美蒋平平王光丽毋瑞仙
Owner JIANGNAN UNIV
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