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Three-dimensional NiFe-LDH/rGO-coated NF catalytic material for fuel cell and preparation method thereof

A three-dimensional, pre-processing technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low reaction kinetics, obstacles, bubble generation, etc., to achieve the effect of increasing specific surface area, low cost, and enhancing electrical conductivity

Pending Publication Date: 2022-04-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from the above formula that four electrons need to be transferred to complete a complete oxygen evolution reaction (OER), so the reaction kinetics is low and severely hindered.
The standard oxidation potential of OER is 1.229 V, but due to problems such as the generation of bubbles in the reaction, the actual required voltage is 1.5 times the theoretical voltage. Therefore, fuel cell applications require a good catalyst to reduce the overpotential of the OER reaction. Promote the OER reaction

Method used

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  • Three-dimensional NiFe-LDH/rGO-coated NF catalytic material for fuel cell and preparation method thereof
  • Three-dimensional NiFe-LDH/rGO-coated NF catalytic material for fuel cell and preparation method thereof
  • Three-dimensional NiFe-LDH/rGO-coated NF catalytic material for fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) NF (nickel foam) pretreatment: ultrasonically treat NF in 2mol / L hydrochloric acid, alcohol, and deionized water for 5-10 minutes, and then put it in a drying oven to dry;

[0022] (2) GO (graphene oxide) pretreatment: 20mgGO was dissolved in 20mL deionized water and sonicated for 3h;

[0023] (3) Preparation of rGO@NF: Add 20mL of water to the sample in step (2), transfer the solution to the reactor, add the NF treated in (1) into the reactor, and perform hydrothermal reaction at 160 °C 24h; take out the sample after the hydrothermal reaction, wash it with deionized water, and dry it to obtain the rGO@NF sample.

[0024] (4) Preparation of NiFe-LDH / rGO@NF: prepare 25mM Fe(NO 3 ) 3 , 25mM Ni(NO 3 ) 2 , 0.2M NH 4 F. 20g / L polyethylene glycol and 0.1M urea mixed solution, stirred for 30min, transferred to the reaction kettle, put the rGO@NF sample in step (3), and reacted hydrothermally at 120°C for 5h; The reacted sample was washed with deionized water and drie...

Embodiment 2

[0026] (1) NF (nickel foam) pretreatment: ultrasonically treat NF in 2mol / L hydrochloric acid, alcohol, and deionized water for 5-10 minutes, and then put it in a drying oven to dry;

[0027] (2) GO (graphene oxide) pretreatment: Dissolve 10mg GO in 20mL deionized water and sonicate for 2h;

[0028] (3) Preparation of rGO@NF: Add 20mL of water to the sample in step (2), transfer the solution to the reactor, add the NF treated in (1) into the reactor, and perform hydrothermal reaction at 160 °C 24h; take out the sample after the hydrothermal reaction, wash it with deionized water, and dry it to obtain the rGO@NF sample.

[0029] (4) Preparation of NiFe-LDH / rGO@NF: prepare 25mM Fe(NO 3 ) 3 , 25mM Ni(NO 3 ) 2 , 0.2M NH 4 F. 20g / L polyethylene glycol and 0.1M urea mixed solution, stirred for 30min, transferred to the reaction kettle, put the rGO@NF sample in step (3), and reacted hydrothermally at 120°C for 3h; The reacted sample was washed with deionized water and dried to ...

Embodiment 3

[0031] (1) NF (nickel foam) pretreatment: ultrasonically treat NF in 2mol / L hydrochloric acid, alcohol, and deionized water for 5-10 minutes, and then put it in a drying oven to dry;

[0032] (2) GO (graphene oxide) pretreatment: dissolve 30mgGO in 20mL deionized water and sonicate for 3h;

[0033] (3) Preparation of rGO@NF: Add 20mL of water to the sample in step (2), transfer the solution to the reactor, add the NF treated in (1) into the reactor, and perform hydrothermal reaction at 160 °C 24h; take out the sample after the hydrothermal reaction, wash it with deionized water, and dry it to obtain the rGO@NF sample.

[0034] (4) Preparation of NiFe-LDH / rGO@NF: prepare 25mM Fe(NO 3 ) 3 , 25mM Ni(NO 3 ) 2 , 0.2M NH 4 F. Mixed solution of 20g / L polyethylene glycol and 0.1M urea, stirred for 30min, transferred to the reaction kettle, put the rGO@NF sample in step (3), and reacted hydrothermally at 120°C for 4h; The reacted sample was washed with deionized water and dried t...

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Abstract

The invention discloses a three-dimensional NiFe-LDH / rGO-coated NF catalytic material for a fuel cell and a preparation method thereof.The preparation method comprises the steps that foamed nickel and graphene oxide are pretreated and subjected to a hydrothermal reaction for 12-24 h at the temperature of 150-200 DEG C, rGO-coated NF is obtained, a mixed solution of ferric nitrate, nickel nitrate, ammonium fluoride, polyethylene glycol and urea is added, a hydrothermal reaction is conducted for 3-5 h at the temperature of 120-160 DEG C, and the three-dimensional NiFe-LDH / rGO-coated NF catalytic material for the fuel cell is prepared. The NiFe-LDH / rGO composite material has more active sites, overcomes the problem that NiFe-LDH and rGO are easy to agglomerate, provides a large number of channels for electron transfer in the reaction process, improves the electron and ion transmission capability of an electrode, and significantly improves the OER catalytic performance of the composite material. The NiFe-LDH / rGO-coated NF catalyst disclosed by the invention not only has excellent electro-catalytic performance, but also is simple and convenient in process, easy to operate, low in cost and environment-friendly, and has a wide application prospect in the field of hydrogen fuel cells.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials for fuel cells, and in particular relates to a three-dimensional NiFe-LDH / rGO@NF catalytic material for fuel cells and a preparation method thereof. Background technique [0002] The urgency of energy shortage brought about by the rapid burning of fossil fuels strongly motivates researchers to seek environmentally friendly and recyclable energy conversion and storage technologies that should be environmentally friendly and efficient. Over the past few decades, fuel cells have been investigated globally for the utilization and generation of hydrogen and oxygen for the perfect compatibility of renewable energy and sustainability. The oxygen evolution reaction (OER) in fuel cells should be active and stable, electrolyzing water into hydrogen and oxygen (H 2 O → 1 / 2O 2 + H 2 ), this reaction can be seen as consisting of two half-reactions, namely the oxygen evolution reaction (OER, H ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8878H01M4/9041H01M4/9075H01M4/9083
Inventor 陈俊锋邱宇潇刘翠张云聪马佳倩
Owner FUZHOU UNIV