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A foam nickel load fe 2 o 3 @ni 3 s 2 Preparation method of composite structure oer electrocatalyst

An electrocatalyst and composite structure technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problem of not providing high catalytic activity, and achieve the effect of good industrial application prospects, excellent electrocatalytic performance, and strong applicability

Active Publication Date: 2022-07-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that pure nickel metal materials cannot provide high catalytic activity. If a Wiener structure is designed on the surface of the material, the electrocatalytic performance of the material will be significantly improved.

Method used

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  • A foam nickel load fe <sub>2</sub> o <sub>3</sub> @ni <sub>3</sub> s <sub>2</sub> Preparation method of composite structure oer electrocatalyst
  • A foam nickel load fe <sub>2</sub> o <sub>3</sub> @ni <sub>3</sub> s <sub>2</sub> Preparation method of composite structure oer electrocatalyst
  • A foam nickel load fe <sub>2</sub> o <sub>3</sub> @ni <sub>3</sub> s <sub>2</sub> Preparation method of composite structure oer electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] S1 nickel foam substrate pretreatment: cut the metal foam nickel (NF) substrate into a rectangle of 1.0cm×4.0cm, put it in 1.0M hydrochloric acid, ultrasonically treat it for 10min, and wash it with ultrapure water three times to remove Hydrochloric acid, finally washed with absolute ethanol, and dried in a vacuum oven after cleaning to obtain a pretreated foam nickel substrate;

[0022] Preparation of Ni by S2 3 S 2 / NF precursor: Measure 16ml of anhydrous ethanol and 16ml of anhydrous ethylenediamine respectively, add them into a beaker, stir magnetically for 10min to make the anhydrous ethanol and anhydrous ethylenediamine evenly mixed, then add 2mmol of sublimation sulfur, continue magnetic stirring 10min, so that the sublimation sulfur is fully dissolved, after stirring, the mixed solution and the pretreated foam nickel substrate prepared in step S1 are transferred into 50ml polytetrafluoroethylene lining, placed in the reaction kettle and packaged, the reaction k...

Embodiment 2

[0028] Figure 4 Fe prepared for Example 2 2 O 3 @Ni 3 S 2 SEM images and comparison of catalytic performance of / NF electrode materials. To study Fe 2+ The effect of the introduction amount on the OER catalytic performance and morphology of the material. Four different Fe 2+ Add molar amounts, respectively 0.2 mmol, 0.4 mmol, 0.6 mmol, 0.8 mmol, Figure 4 (a-c) show the SEM pictures of the samples at the first three molar amounts. Figure (a) shows that Fe 2+ When the molar amount added is small, Ni 3 S 2 The material grown on the surface of the nanowires is not uniform. Many substances extend between the nanowires to form a curved surface with the nanowire as the edge, and there are also granular material agglomeration. As can be seen from Figure (b), as Fe 2+ The increase in the molar amount added, Fe 2 O 3 Nanoparticles in Ni 3 S 2 The nanowires are distributed at intervals, showing the state of nanowire strings and balls, and the overall distribution is unif...

Embodiment 3

[0030] Figure 5 Fe prepared for Example 3 2 O 3 @Ni 3 S 2 SEM images and comparison of catalytic performance of / NF electrode materials. In order to study the effect of the hydrothermal reaction temperature on the OER properties and morphology of the material, four hydrothermal reaction temperatures of 80 °C, 90 °C, 100 °C, and 110 °C were set in the experiment. Figure 5 (a-c) show the surface morphologies of the corresponding materials at 80°C, 90°C, and 100°C. Figure (a) shows that the hydrothermal reaction temperature of 80 °C is only 3 S 2 A very small amount of nanoparticles grew on the surface of the nanowire, so the surface morphology of the sample under this condition was similar to that of Ni. 3 S 2 / NF precursor materials are very similar; it can be seen from Figure (b) that the nanoparticles are uniformly distributed along the extension direction of the nanowires, and the spacers are coated in Ni 3 S 2 nanowires. When the hydrothermal temperature is 100...

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Abstract

The invention discloses a foam nickel loaded with Fe 2 O 3 @Ni 3 S 2 The preparation method of the composite structure OER electrocatalyst comprises the following steps in sequence: S1 pretreatment of nickel foam substrate, S2 preparation of Ni 3 S 2 / NF precursor, S3 to prepare Fe 2 O 3 @Ni 3 S 2 / NF. The invention solves the problem of containing oxide impurities on the surface of NF through acid treatment, and the modification makes the supported material easy to grow on the substrate. First, Ni3S2 nanowires are etched and grown on the surface of NF, and then a string of spherical Fe is grown on the surface of the nanowires. 2 O 3 Nanoparticles, prepared Fe 2 O 3 @Ni 3 S 2 / NF material has high specific surface area, which makes the efficiency of electrocatalytic water splitting for oxygen production significantly improved, and has very low overpotential at high current density, 100 mA / cm 2 The overpotential under the current density is only 223mV, and it has excellent OER electrocatalytic performance under the high current density; the invention is low in cost, easy to control and scale, and has a good industrial application prospect; at the same time, it has strong applicability and can be extended to other Preparation and large-scale production of electrocatalytic devices.

Description

technical field [0001] The invention relates to a preparation process of a high-efficiency electrocatalytic moisture analysis oxygen reaction (OER) catalyst, in particular to a foam nickel supported Fe 2 O 3 @Ni 3 S 2 Preparation method of composite structure OER electrocatalyst. Background technique [0002] Hydrogen energy is an extremely superior new energy. Its main advantages are: high combustion calorific value, clean and pollution-free, abundant resources, and wide application range. The key technologies for developing hydrogen energy include two aspects: on the one hand, to solve the problem of hydrogen production; on the other hand, to solve the problem of hydrogen storage and transportation. Whether hydrogen can be widely used, the choice of hydrogen production method is very important. Hydrogen production methods mainly include electrolysis of water for oxygen production, photolysis of water for hydrogen production, fossil fuel hydrogen production, biomass hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/091C25B11/061
CPCC25B1/04Y02E60/36
Inventor 唐少春乔清山张晟
Owner NANJING UNIV
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