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Electrocatalyst for catalyzing water decomposition to produce hydrogen, and preparation method and application thereof

An electrocatalyst and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as harsh operating conditions and complex processes, and achieve high reaction efficiency, simple operation, and simple preparation process. Effect

Inactive Publication Date: 2018-06-01
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal sulfides are usually prepared by methods such as magnetron sputtering, chemical vapor deposition, ultrasonic synthesis, surfactant-assisted synthesis, hydrothermal / solvothermal methods, etc., but these methods are relatively complicated and operate under harsh conditions. , which limits their application

Method used

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  • Electrocatalyst for catalyzing water decomposition to produce hydrogen, and preparation method and application thereof
  • Electrocatalyst for catalyzing water decomposition to produce hydrogen, and preparation method and application thereof
  • Electrocatalyst for catalyzing water decomposition to produce hydrogen, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Ni 3 S 2 The specific steps of @NiOOH@NF catalyst preparation: First, put the treated nickel foam vertically into the catalyst containing 0.3M Na 2 In a reaction kettle of S aqueous solution, put it in an oven at 120°C for hydrothermal reaction for about 10 hours to form Ni 3 S 2 @NF Catalyst. References: N. Jiang, Q. Tang, M. Sheng, B. You, D. Jiang, Y. Sun, Nickel sulfides for electrocatalytic hydrogen evolution under alkaline conditions: a case study of crystalline NiS, NiS 2 , and Ni 3 S 2 nanoparticles, Catal. Sci. Technol. 2016, 6, 1077–1084. Rinse the sulfided nickel foam several times with deionized water and dry it naturally, carry out electrochemical oxidation in a borate buffer solution, apply a bias voltage of 1.2V, and use the Ni obtained above 3 S 2 @NF is used as working electrode, Ag / AgCl is used as reference electrode, platinum mesh is used as counter electrode, and borate buffer solution is used as electrolyte to obtain Ni after electrodepositi...

Embodiment 2

[0034] Perform electrochemical oxidation on the sulfided nickel foam, apply a bias voltage of 1.2V, and use Ni 3 S 2 @NF is the working electrode, Ag / AgCl is the reference electrode, the platinum mesh is the counter electrode, and boric acid buffer solution (pH 9.18) is the electrolyte, respectively depositing 0, 200, 400, 600, 800, 1000s, through linear sweep voltammetry (LSV) test to illustrate the effect of deposition time on catalyst activity (see Figure 5 ).

[0035] Depend on Figure 5 Displayed Ni 3 S 2 LSV curves of electrodeposited NiOOH at different deposition times for @NF electrodes. It can be observed that the HER activity of the synthesized electrodes is affected by the deposition time. Among them, the activity was the best when the electrodeposition was 800s, and no further increase in activity was observed beyond this time. Therefore, the synthesis of Ni 3 S 2 The deposition time of @NiOOH@NF catalyst was optimized to be 800s.

Embodiment 3

[0037] Made Ni 3 S 2 Catalytic activity evaluation of @NiOOH@NF catalyst.

[0038] With 1M NaOH as the electrolyte solution, Ag / AgCl as the reference electrode, and platinum mesh as the counter electrode, NF, NiOOH@NF, Ni 3 S 2 @NF,Ni 3 S 2 @NiOOH@NF is the working electrode, the scan rate is 5mV / s, and the LSV test is carried out. The catalytic activities of different electrodes are as follows Image 6 shown.

[0039] Such as Image 6 As shown in (a), compare Ni in 1M NaOH solution 3 S 2 @NF and Ni 3 S 2 HER performance of @NiOOH@NF catalysts. Meanwhile, the HER performance of bare NF and NiOOH@NF was also tested using the same method. Ni 3 S 2 @NiOOH@NF at 10mA / cm 2 The lowest overpotential is 160mV when the Ni 3 S 2 @NiOOH@NF has the best catalytic activity for HER. In contrast, NF, NiOOH@NF and Ni 3 S 2 @NF sample at 10mA / cm 2 The overpotentials of 217, 210 and 237mV were displayed respectively. By comparing bare NF, NiOOH@NF, Ni 3 S 2 @NF and Ni 3...

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Abstract

The invention relates to the technical field of electrocatalytic water decomposition hydrogen production, in particular to an electrocatalyst Ni3S2@NiOOH@NF for catalyzing water decomposition to produce hydrogen, and a preparation method and application thereof. The catalyst adopts nickel foam (NF) as a substrate and a nickel source, adopts a sodium sulphide water solution as a sulfurizing reagent, and is obtained through a hydrothermal method and an electrodeposition method. The Ni3S2@NiOOH composite catalyst is of a multi-channel core-shell structure, so that a material and an electrolyte are fully contacted favorably. The Ni3S2@NiOOH adopts the nickel foam as the nickel source to grow, and is firmly combined with the substrate, so that rapid transmission of charge is facilitated. The catalyst prepared by the method provided by the invention shows favorable electrocatalytic activity in alkaline electrolyte and under lower overpotential; in addition, after the catalyst is tested for 4to 5 hours under different current densities, the stability is not remarkably reduced, so that the catalyst can be effectively applied to the field of electrocatalytic water decomposition hydrogen production.

Description

technical field [0001] The invention relates to the technical field of electrocatalytic water splitting hydrogen production, in particular to an electrocatalyst Ni that catalyzes water splitting hydrogen production 3 S 2 @NiOOH@NF and its preparation method and application. Background technique [0002] Electrochemical methods to catalyze water splitting are an extremely promising approach to produce clean hydrogen fuels. Water splitting includes two half-reactions: hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), and electrocatalysts play an important role in reducing the overpotential, which can improve the efficiency of electrocatalysis. It is reported that catalytic hydrogen production generally occurs under acidic conditions, and oxygen production generally occurs under alkaline environments. However, it is difficult for the equipment to work stably for a long time under acidic conditions during the electrolysis process. Noble metal catalysts, ...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J37/10B01J37/34C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/043B01J37/10B01J37/342B01J35/398B01J35/33Y02E60/36
Inventor 刘爱骅王秀秀
Owner QINGDAO UNIV
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