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Mixed-phase tungsten sulfide modified cuprous oxide double-layer hydrogen evolution photoelectrode and its preparation

A cuprous oxide and tungsten sulfide technology, applied in the field of photoelectrodes, can solve the problems of reducing photoelectric conversion efficiency or hydrogen production in the catalytic process, no reports on cuprous oxide double-layer hydrogen evolution photoelectrodes, and reducing catalyst reaction activity, etc. Achieve the effect of improving photoelectric conversion efficiency, high photoelectric hydrogen evolution efficiency, and improved electrocatalytic hydrogen evolution activity

Active Publication Date: 2018-10-09
TIANJIN UNIV RENAI COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However pure Cu 2 O as a photocatalyst has the following two disadvantages: (1) The electrons and holes generated by photoexcitation are easy to recombine on the surface of the catalyst and convert into thermal energy, thereby reducing the photoelectric conversion efficiency or hydrogen production of the catalytic process; (2) due to Cu 2 Cu in O is in an intermediate valence state (+1), which is easily oxidized, making the storage of the catalyst more difficult, and prone to photocorrosion to reduce the reactivity of the catalyst.
[0005] So far, there have been no reports on cuprous oxide double-layer hydrogen evolution photoelectrodes modified with tungsten sulfide.

Method used

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  • Mixed-phase tungsten sulfide modified cuprous oxide double-layer hydrogen evolution photoelectrode and its preparation
  • Mixed-phase tungsten sulfide modified cuprous oxide double-layer hydrogen evolution photoelectrode and its preparation
  • Mixed-phase tungsten sulfide modified cuprous oxide double-layer hydrogen evolution photoelectrode and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepared CuSO 4 (0.05M) and trisodium citrate (0.05M) mixed solution 50mL, then use 1M NaOH solution to adjust its pH value to 11.0, use oil bath to heat the mixed solution to 65 o C, then FTO (1cm×2cm) glass was used as the working electrode, Ag / AgCl was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode to prepare Cu by electrodeposition under the condition of -0.4V vs Ag / AgCl for 2h 2 O thin film photoelectrode. Weigh 2.38 g solid WS 2 (9.6 mM) powder was poured into a dry 50ml Shrek tube equipped with a magnet, and the air in the tube was replaced with argon, then 6ml of 2.4M n-butyl lithium in n-hexane solution was added, sealed and heated in an oil bath to 66 o C, continuous reaction for 24h. Suction filtration, dry the product with argon, add deionized water, and then centrifuge at 14000rpm to remove unstripped solid WS 2 , you can get M-WS 2 Aqueous solution, 1T-WS 2 accounted for mixed-phase tungsten sulfi...

Embodiment 2

[0023] Formulated Cu 2 SO 4 (0.06M) and trisodium citrate (0.06M) mixed solution 50mL, then use 1M NaOH solution to adjust its pH value to 11.0, use an oil bath to heat the solution to 65 o C, then FTO (1cm×2cm) glass was used as the working electrode, Ag / AgCl was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode to prepare Cu by electrodeposition under the condition of -0.4V vs Ag / AgCl for 1.5h 2 O thin film photoelectrode. Weigh 2.38g solid WS 2 (6μm) powder into a clean anhydrous 50ml Shrek tube equipped with magnetons, replace the air in the tube with argon, then add 8ml of 2.4M n-butyl lithium in n-hexane solution, seal it and use an oil bath Heat the reactants to 66 o C, continue to react for 30h. Suction filtration, dry the product with argon, add deionized water, and then centrifuge at 14000rpm to remove unstripped WS 2 , you can get M-WS 2 (1T-WS 2 The mass percentage is 55%). The stripped M-WS 2 The solubili...

Embodiment 3

[0025] Formulated Cu 2 SO 4 (0.08M) and trisodium citrate (0.08M) mixed solution 50mL, then use 1M NaOH solution to adjust its pH value to 11.0, use an oil bath to heat the solution to 65 o C, then FTO (1cm×2cm) glass was used as the working electrode, Ag / AgCl was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode to prepare Cu by electrodeposition under the condition of -0.4V vs Ag / AgCl for 1h 2 O thin film photoelectrode. Weigh 2.38g solid WS 2 (6μm) powder is poured into a clean anhydrous Shrek tube (50ml) equipped with magnetons, and the air in the tube is replaced by argon, and then 10ml of 2.4M n-butyllithium in n-hexane solution is added, and after sealing, use oil Heat bath to 66 o C, for 36 hours. Suction filtration, dry the product with argon, add deionized water, and then centrifuge at 14000rpm to remove unstripped WS 2 , the mixed-phase WS can be obtained 2 (1T-WS 2 The quality score is 65%). The stripped mi...

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Abstract

The invention discloses a mixed-phase-state tungsten sulfide modified cuprous oxide double-chromatography hydrogen photoelectrode and a manufacturing method thereof. The electrode takes FTO glass as a substrate, a cuprous oxide film layer, which is 0.8-1.0 [mu] m thick, is deposited on the substrate, a mixed-phase-state tungsten sulfide film layer, which is 0.2-0.4 [mu] m thick, is arranged on the film layer, the mixed phase state is composed of 2H-WS2 and 1T-WS2, and a mass ratio of the two film layers is 1 to (0.15-0.30). The manufacturing method comprises the following steps of: performing electro-deposition on the FTO glass to prepare a Cu2O film; performing intercalation and exfoliation on WS2 to obtain an M-WS2 solution; and manufacturing the Cu2O film into the mixed-phase-state tungsten sulfide film layer in the M-WS2 solution. The electrode is used for decomposing water through photoelectrocatalysis to prepare hydrogen gas. The mixed-phase-state tungsten sulfide modified cuprous oxide double-chromatography hydrogen photoelectrode and the manufacturing method thereof have the advantages that: the manufacturing process is simple, the manufactured electrode does not contain noble metal, cost is relatively low, and photoelectric hydrogen evolution efficiency is high.

Description

technical field [0001] The invention relates to a mixed-phase tungsten sulfide-modified cuprous oxide double-layer hydrogen evolution photoelectrode and a preparation method, belonging to the technical field of photoelectrodes. Background technique [0002] Energy shortage is a serious problem in the 21st century. Finding sustainable and clean energy can not only solve various social problems caused by energy shortage, but also reduce environmental pollution caused by fossil fuel combustion. Photoelectrochemical hydrogen evolution technology is an emerging energy technology, which combines photoelectric conversion process and electrohydrogen evolution process, can convert solar energy into electrical energy, and further use the electrical energy to electrolyze water to produce hydrogen through hydrogen evolution catalyst, which has great potential Development potential. [0003] Cuprous oxide (Cu 2 O) is a typical p-type direct semiconductor with a bandgap of only ~2.0 eV,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/04C25B11/06C25B1/04
CPCC25B1/04C25D9/04C25B1/55C25B11/051C25B11/093Y02E60/36
Inventor 陈莹王玥
Owner TIANJIN UNIV RENAI COLLEGE
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