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Mn doped Ni3S2 nanoarray hydrogen evolution catalyst and preparation method and application thereof

A nano-array and nano-sheet array technology is applied in the field of Mn-doped Ni3S2 nano-array hydrogen evolution catalyst and its preparation, which can solve the problems of small reserves, high cost and the like, and achieve high electrochemical conductivity, good durability, and high surface area. The effect of roughness

Active Publication Date: 2018-12-21
BEIJING CEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, catalysts based on noble metal Pt are the best hydrogen evolution reaction (HER) catalysts, but their high cost and small reserves limit their large-scale application.

Method used

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  • Mn doped Ni3S2 nanoarray hydrogen evolution catalyst and preparation method and application thereof
  • Mn doped Ni3S2 nanoarray hydrogen evolution catalyst and preparation method and application thereof
  • Mn doped Ni3S2 nanoarray hydrogen evolution catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of precursor by hydrothermal method: ① 1mmol Ni(NO 3 ) 2 ·6H 2 O, 0.2mmol Mn(NO 3 ) 2 , 10mmol urea was put into 40mL deionized water and stirred until the solution was clear. ② Transfer the pretreated nickel foam and the clear solution prepared in ① to a polytetrafluoroethylene autoclave, keep it warm at 120°C for 6.5h, and cool to room temperature Take out, rinse with water to obtain the precursor;

[0028] (2) Preparation of Mn-Ni 3 S 2 / NF: Add 8mmol of Na 2 S was dissolved in 40mL deionized water, and the precursor prepared in step (1) and Na 2 The S solution was transferred into a polytetrafluoroethylene autoclave, kept at 120°C for 3.5h, cooled to room temperature, taken out, rinsed with water, and prepared Mn-Ni 3 S 2 / NF, nanosheet array (Mn-Ni 3 S 2 ) on nickel foam (NF) with a loading of 1.1mg cm -2 .

Embodiment 2

[0030] (1) Preparation of precursor by hydrothermal method: ① 1mmol Ni(NO 3 ) 2 ·6H 2 O, 0.1mmol Mn(NO 3 ) 2 , 10mmol urea was put into 40mL deionized water and stirred until the solution was clear. ② Transfer the pretreated nickel foam and the clear solution prepared in ① to a polytetrafluoroethylene autoclave, keep it warm at 125°C for 6h, and take it out after cooling to room temperature. , washing with water to prepare the precursor;

[0031] (2) Preparation of Mn-Ni 3 S 2 / NF: Add 8mmol of Na 2 S was dissolved in 55mL deionized water, and the precursor prepared in step (1) and Na 2 The S solution was transferred into a polytetrafluoroethylene autoclave, kept at 110°C for 4 hours, cooled to room temperature, taken out, and washed with water to obtain Mn-Ni 3 S 2 / NF, nanosheet array (Mn-Ni 3 S 2 ) on nickel foam (NF) is 1.2mg·cm -2 .

Embodiment 3

[0033](1) Preparation of precursor by hydrothermal method: ① 1mmol Ni(NO 3 ) 2 ·6H 2 O, 0.3mmol Mn(NO 3 ) 2 , 10mmol urea was put into 40mL deionized water and stirred until the solution was clear. ② Transfer the pretreated nickel foam and the clear solution prepared in ① to a polytetrafluoroethylene autoclave, keep it warm at 115°C for 7h, and take it out after cooling to room temperature. , washing with water to prepare the precursor;

[0034] (2) Preparation of Mn-Ni 3 S 2 / NF: Add 8mmol of Na 2 S was dissolved in 40mL deionized water, and the precursor prepared in step (1) and Na 2 The S solution was transferred into a polytetrafluoroethylene autoclave, kept at 125°C for 3 hours, cooled to room temperature, taken out, and rinsed with water to obtain Mn-Ni 3 S 2 / NF, nanosheet array (Mn-Ni 3 S 2 ) on nickel foam (NF) is 1.2mg·cm -2 .

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Abstract

The invention belongs to the technical field of nanometer new materials, and in particular, relates to a Mn doped Ni3S2 nanoarray hydrogen evolution catalyst and a preparation method and application thereof. Mn doped Ni3S2 nanosheets uniformly and regularly grow on the surface of a foam nickel substrate to form a nanometer sheet array. The preparation method comprises the following steps: pretreated foam nickel, soluble nickel salt, soluble manganese salt and urea are hydrothermally reacted in a reaction kettle to prepare a precursor; the prepared precursor and Na2S solution are positioned inthe reaction kettle for a vulcanization reaction; after reaction, a product is cooled and washed by water to obtain the catalyst. The prepared catalyst is higher in surface roughness and electrochemical electric conductivity; through open space and three-dimensional structure of the foam nickel, the diffusion of electrolytes and escaped hydrogen is facilitated; through the advantages, the positivecontribution is given for improvement of the electrochemical expression; and meanwhile, the preparation method is convenient and easy to obtain materials. The prepared catalyst is applied to the hydrogen evolution reaction under alkaline condition, and achieves excellent electrocatalysis performance and excellent durability.

Description

technical field [0001] The invention belongs to the technical field of new nanometer materials, in particular to a kind of Mn-doped Ni 3 S 2 Nano-array hydrogen evolution catalyst and its preparation method and application. Background technique [0002] With the rapid increase in energy demand and the environmental problems caused by the consumption of fossil energy, relevant policies have been promulgated in various countries to promote the conversion of clean energy. As a kind of combustion product, hydrogen is non-polluting, and the earth's abundant clean energy has attracted widespread attention. Electrochemical water splitting is considered to be one of the promising means for large-scale hydrogen production, and highly efficient catalysts are essential for this pathway. Currently, noble metal Pt-based catalysts are the most excellent hydrogen evolution reaction (HER) catalysts, but their high cost and small reserves limit their large-scale application. Therefore, i...

Claims

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Application Information

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IPC IPC(8): C25B11/03C25B11/06C23C18/12C25B1/04B82Y40/00
CPCB82Y40/00C23C18/1204C25B1/04C25B11/031C25B11/091Y02E60/36
Inventor 孔荣梅杜蕙同渠凤丽
Owner BEIJING CEI TECH
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