High-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, method for synthesizing high-performance ultrathin nitride electro-catalyst and application thereof

A technology of nitride electricity and synthesis method, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of low cost, large specific surface area, good conductivity and stability

Active Publication Date: 2015-12-16
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of bimetallic nitrides, especially NiFe nitrides, in total water splitting reactions has not been reported.

Method used

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  • High-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, method for synthesizing high-performance ultrathin nitride electro-catalyst and application thereof
  • High-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, method for synthesizing high-performance ultrathin nitride electro-catalyst and application thereof
  • High-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, method for synthesizing high-performance ultrathin nitride electro-catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Synthesis of comparison samples:

[0049] Synthesis of NiFe-MMO

[0050] (1) Synthesis of NiFe hydrotalcite (NiFe-LDH) precursor: 5 mL of n-butanol and 8 mL of oleylamine were placed in a reactor, stirred at high speed to obtain a microemulsion environment, and Ni 2+ , Fe 3+ Add it into the reactor in a certain proportion, mix it evenly, and then hydrothermally crystallize it in a high airtight system for 6-48h. After the reaction, the product was centrifuged and washed with ethanol-water mixed solution, and dried to obtain NiFe-LDH.

[0051] (2) High temperature oxidation: put NiFe-LDH in a muffle furnace, program the temperature to 400-700°C, and keep the high temperature for 5-10h, the heating rate is 5°C / min-10°C / min, and the dark brown oxidation product NiFe is obtained -MMOs.

[0052] Ni 3 Synthesis of N

[0053] Put NiO in an atmosphere tube electric furnace, program the temperature to 300-600°C in an ammonia atmosphere, and keep the high temperature for 3-...

Embodiment 2

[0055] FeNi with ultrathin nanosheet structure 3 The preparation method of N electrocatalyst comprises:

[0056] (1) Synthesis of NiFe-LDH precursor: 5 mL of n-butanol and 8 mL of oleylamine were placed in a reactor, stirred at high speed to obtain a microemulsion environment, and Ni 2+ , Fe 3+ Add it into the reactor at a certain molar ratio (1-3:1), mix it evenly, and then hydrothermally crystallize it in a highly closed system for 6-48 hours. The temperature of hydrothermal crystallization is 100-150°C. After the reaction, the product was centrifuged and washed with ethanol-water mixed solution, and dried to obtain NiFe-LDH. The chemical formula of the NiFe-LDH is [Ni 2+ 1-x Fe 3+ x (OH) 2 ] x+ ·(A n- ) x / n mH 2 O, 0.16≤x≤0.50, 0.5≤m≤9, its XRD is as follows figure 2 As shown, the NiFe-LDH has a size of 20-100 nm and a thickness of 3-10 nm.

[0057] (2) High-temperature nitriding: Put NiFe-LDH in an atmosphere tube electric furnace, program the temperature to ...

Embodiment 3

[0061] FeNi with ultrathin nanosheet structure 3 The preparation method of N electrocatalyst comprises:

[0062] (1) Synthesis of NiFe-LDH precursor: 5 mL of n-butanol and 8 mL of oleylamine were placed in a reactor, stirred at high speed to obtain a microemulsion environment, and Ni 2+ , Fe 3+ Add it into the reactor at a certain molar ratio (1-3:1), mix it evenly, and then hydrothermally crystallize it in a highly closed system for 6-48 hours. The temperature of hydrothermal crystallization is 100-150°C. After the reaction, the product was centrifuged and washed with ethanol-water mixed solution, and dried to obtain NiFe-LDH. The chemical formula of the NiFe-LDH is [Ni 2+ 1-x Fe 3+ x (OH) 2 ] x+ ·(A n- ) x / n mH 2 O, 0.16≤x≤0.50, 0.5≤m≤9, the size is 20-100nm, and the thickness is 3-10nm.

[0063] (2) High-temperature nitriding: place NiFe-LDH in an atmosphere tube electric furnace, program the temperature to 500°C in an ammonia atmosphere, and keep the high tempe...

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Abstract

The invention discloses a high-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, a method for synthesizing the high-performance ultrathin nitrite electro-catalyst and application thereof. A chemical formula of the high-performance ultrathin nitride electro-catalyst is (Fe<X>Ni<1-X>)<4>N, and the x is larger than 0 and is smaller than 1. The nitrite electro-catalyst is of an ultrathin nanometer plate structure, the size of the nitrite electro-catalyst is 50-100nm, and the thickness of the nitrite electro-catalyst is 1.5-3nm. The method includes synthesizing NiFe hydrotalcite precursors at first; nitriding the NiFe hydrotalcite precursors at high temperatures under the protection of ammonia gas to obtain end products. The high-performance ultrathin nitride electro-catalyst, the method and the application have the advantages that series of nitrite have large specific surface areas, are good in electron conductance and are excellent in performance during electro-catalytic water total-decomposition reaction, limiting currents are higher than limiting currents of Pt/C during electro-catalytic hydrogen evolution reaction (HER), and the performance of the nitride in various aspects are superior to the performance of corresponding oxide NiFe-MMO during oxygen evolution reaction (OER); the electro-catalyst is low in cost, easy and convenient to operate, simple in process and excellent in catalytic performance, and fundamental application research on materials in the field of electro-catalysis can be provided.

Description

technical field [0001] The invention relates to the field of electrocatalyst and its preparation. More specifically, it relates to an ultra-thin nitride electrocatalyst for high-performance electrochemical total decomposition of water to produce hydrogen and oxygen, as well as its synthesis method and application. Background technique [0002] With the growing energy crisis, people's demand for renewable green energy is becoming more and more urgent. Water is a renewable clean energy with huge reserves on the earth. It has been widely used in all aspects of human life and production. Total water splitting is an effective means of chemical energy storage. High-efficiency catalysts can improve the total splitting of water by two and a half The reaction efficiency of the reaction. [0003] Hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) play a vital role in electrochemical energy applications such as fuel cells and total water splitting. However, current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C25B1/04B82Y30/00B82Y40/00
CPCY02E60/36
Inventor 张铁锐加晓丹赵宇飞陈广波吴骊珠佟振合
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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