A kind of bimetallic Fe-co nitride electrocatalyst and its preparation method and application

A nitride electro and bimetallic technology, applied in the field of electrocatalysis, can solve the problem of little research on oxygen evolution reaction catalysts, and achieve the effects of improving catalytic oxygen evolution reaction performance, less environmental pollution, high N content and specific surface area

Active Publication Date: 2022-02-08
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, metal nitrides have been widely used as efficient hydrogen evolution reaction catalysts, but little research has been done as oxygen evolution reaction catalysts.

Method used

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  • A kind of bimetallic Fe-co nitride electrocatalyst and its preparation method and application
  • A kind of bimetallic Fe-co nitride electrocatalyst and its preparation method and application
  • A kind of bimetallic Fe-co nitride electrocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Fe-Co(2:1)N x Preparation of electrocatalyst

[0031] Weigh 1.65mmol Co(NO 3 ) 2 .6H 2 O, 3.31mmol Fe(NO 3 ) 3 .9H 2 O was dissolved in 20ml deionized water to make metal precursor solution A; 26mmol excess NaBH was weighed 4 Dissolve in 150ml deionized water to make reducing solution B (molar concentration is 0.17mol / L); at room temperature, under 900 rpm magnetic stirring and Ar gas protection conditions, add solution B dropwise to metal precursor solution A , continue to stir and react for 2h to obtain a black mixture; centrifuge the obtained mixture, wash with deionized water, and vacuum dry at 60°C for 12h to obtain a solid powder; put the solid powder in a tube furnace NH 3 Under the atmosphere, the temperature was raised to 500°C at a heating rate of 8°C / min, kept for 2 hours, and the bimetallic Fe-Co nitride electrocatalyst was obtained after cooling, which was recorded as Fe-Co(2:1)N x electrocatalyst.

[0032] For the bimetallic Fe-Co(2:1)N...

Embodiment 2

[0034] Example 2: Fe-Co(1:3)N x Preparation of electrocatalyst

[0035] Weigh 4.59mmol Co(NO 3 ) 2 .6H 2 O, 1.53mmol Fe(NO 3 ) 3 .9H 2 O was dissolved in 30ml deionized water to make metal precursor solution A; then weigh 26mmol excess NaBH 4 Dissolve in 100ml deionized water to make reducing solution B (molar concentration is 0.26mol / L); at room temperature, under 700 rpm magnetic stirring and Ar gas protection conditions, add solution B dropwise to metal precursor solution A , continue to stir and react for 1h to obtain a black mixture; centrifuge the resulting mixture, wash with deionized water, and vacuum dry at 60°C for 12h to obtain a solid powder; put the solid powder in a tube furnace NH 3 Under the atmosphere, the temperature was raised to 500°C at a heating rate of 5°C / min, kept for 2 hours, and after cooling, a bimetallic Fe-Co nitride electrocatalyst was obtained, which was denoted as Fe-Co(1:3)N x electrocatalyst.

[0036] For the Fe-Co(1:3)N prepared by ...

Embodiment 3

[0039] Example 3: Fe-Co(1:5)N x Catalyst preparation

[0040] Weigh 4.59mmol Co(NO 3 ) 2 .6H 2 O, 0.92mmol Fe(NO 3 ) 3 .9H 2 O was dissolved in 40ml deionized water to make metal precursor solution A; then weigh 26mmol excess NaBH 4 Dissolve in 50ml deionized water and make reducing solution B (molar concentration is 0.52mol / L); At room temperature, 900 rpm magnetic stirring and N 2 Under gas-protected conditions, solution B was added dropwise to metal precursor solution A, and the reaction was continued for 0.5 h to obtain a black mixture; the obtained mixture was centrifuged, washed with deionized water, and vacuum-dried at 80°C for 8 hours to obtain a solid powder; Put the solid powder in the tube furnace NH 3 Under the atmosphere, the temperature was raised to 500°C at a heating rate of 5°C / min, kept for 2 hours, and the bimetallic Fe-Co nitride electrocatalyst was obtained after cooling, which was recorded as Fe-Co(1:5)N x electrocatalyst.

[0041] For the Fe-Co...

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Abstract

The invention discloses a bimetallic Fe-Co nitride electrocatalyst and its preparation method and application. The preparation method comprises the following steps: firstly, the precursor solution A containing soluble Fe salt and Co salt is mixed with the precursor solution A containing excess NaBH 4 The reducing solution B in the inert gas was slowly mixed and stirred for reaction; after purification and drying, heating and nitriding treatment was carried out in ammonia gas to obtain a bimetallic Fe-Co nitride electrocatalyst. The preparation method of the present invention has the advantages of simplicity, safety, easy regulation of the metal ratio, and no adverse impurity effects, etc. The element percentage of N in the prepared Fe-Co nitride electrocatalyst is 5.46-10.01%, and the bimetallic Fe-Co The nitride electrocatalyst is used to catalyze the oxygen evolution reaction, and the activity of the catalytic oxygen evolution reaction is better than that of IrO 2 The benchmark catalyst has significantly improved its catalytic performance for the oxygen evolution reaction relative to a single metal, and its stability has also been significantly improved.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to a bimetallic Fe-Co nitride electrocatalyst and its preparation method and application. Background technique [0002] Human development has brought about increasingly serious environmental problems and energy crises. Exploring and developing sustainable clean energy is undoubtedly one of the major issues we face in the 21st century. In the storage and conversion of renewable energy, the oxygen evolution reaction is one of the keys to the water-oxygen conversion process. Due to the four-electron transfer involved, the kinetic process of the oxygen evolution reaction is sluggish, which greatly restricts the conversion efficiency of related energy devices. High-efficiency, stable and low-cost oxygen evolution catalysts can effectively reduce the overpotential of oxygen evolution reaction, which is a breakthrough to improve the storage and conversion efficiency of renewable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/091
CPCY02E60/36
Inventor 胡玮张凯凯李国强麦婉珊
Owner HUBEI UNIV
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