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Multiphase nanometer heterojunction material and preparation method and application thereof

A heterojunction and nanotechnology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of catalytic performance, poor electron transport ability, electrical conductivity and catalytic activity. Low-level problems, to achieve excellent catalytic performance, low price, improve activity and stability

Active Publication Date: 2022-01-18
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 1T phase has higher activity, but is thermodynamically unstable and easily converts to the 2H phase with lower conductivity and catalytic activity
In addition, the single-component phase electron transport ability is poor, and the catalytic performance is easy to reach the ceiling

Method used

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  • Multiphase nanometer heterojunction material and preparation method and application thereof
  • Multiphase nanometer heterojunction material and preparation method and application thereof
  • Multiphase nanometer heterojunction material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: 1T / 2H-MoSe 2 - Preparation of H / R-NiSe

[0040] First weigh 0.5mmol of nickel nitrate and 0.5mmol of sodium molybdate and dissolve them in 15mL of deionized water, then transfer them to a stainless steel reaction kettle with a polytetrafluoroethylene liner, immerse a piece of foamed nickel (2cm*2cm), and seal Place in an oven and react at 150°C for 6h. After the reaction, it was naturally cooled to room temperature, washed with deionized water and ethanol, and dried in a blast drying oven at 60°C to obtain the precursor NiMoO 4 - NF, wherein NF stands for nickel foam. NiMoO after drying 4 -NF was calcined at 450°C for 2 hours in an argon atmosphere to obtain crystalline NiMoO 4 . Dissolve 2 / 3mmol of selenium powder in 1.6mL of hydrazine hydrate solution, add 8.4mL of deionized water, and immerse a piece of calcined NiMoO 4 -NF (2cm*2cm), sealed and placed in an oven, reacted at 200°C for 2 hours. After the reaction, it was naturally cooled to room temp...

Embodiment 2

[0046] Example 2: 1T / 2H-MoSe 2 Preparation of -H-NiSe

[0047] Dissolve 2 / 3mmol of selenium powder in 1.6mL of hydrazine hydrate solution, dissolve 1 / 3mmol of sodium molybdate in 8.4mL of deionized water and mix evenly with the hydrazine hydrate solution, immerse a piece of calcined NiMoO 4 -NF (2cm*2cm), sealed and placed in an oven, reacted at 200°C for 2 hours. After the reaction, it was naturally cooled to room temperature, washed with deionized water and ethanol, and dried in a blast drying oven at 60°C to obtain 1T / 2H-MoSe 2 -H-NiSe.

[0048] like Image 6 As shown, 1T / 2H-MoSe 2 The morphology of -H-NiSe is no longer nanorods, but completely evolved into nanosheets.

[0049] like Figure 7 As shown, 1T / 2H-MoSe 2 -H-NiSe is composed of 1T phase MoSe 2 , MoSe in 2H phase 2 It is composed of NiSe and H phase, and the three elements of Ni, Se and Mo are evenly distributed.

[0050] like Figure 8 As shown, the contents of Ni, Se, and Mo are roughly consistent with...

Embodiment 3

[0052] Embodiment 3: HER performance test in alkaline electrolyte

[0053] The entire electrocatalytic test is carried out under the standard three-electrode system, in which the working electrode is 1T / 2H-MoSe 2 -H / R-NiSe-NF or 1T / 2H-MoSe 2 -H-NiSe-NF (effective area is 0.5cm 2 ), the reference electrode is an Ag / AgCl (saturated chlorine KCl solution) electrode, and the auxiliary electrode is a platinum wire electrode. The electrolyte solution used for the linear sweep voltammetry (LSV) test is 1M KOH solution, the potential scan range is -1.6~-1V, and the scan speed is 5mV / s. The test data has not been compensated by iR.

[0054] like Figure 10 As shown in (a) and (b), 1T / 2H-MoSe 2 -H / R-NiSe-NF and 1T / 2H-MoSe 2 -H-NiSe-NF all exhibit excellent electrocatalytic performance for HER, but 1T / 2H-MoSe 2 -H-NiSe-NF is even better at 10mA cm -2 Under the current density, the overpotential values ​​are 87.6mV and 30.6mV respectively, and the Tafel slopes are 139.5mV·dec -1 a...

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Abstract

The invention relates to the technical field of nano materials, and particularly discloses a preparation method of a multiphase nano heterojunction material. The method comprises the following steps: providing a substrate loaded with an NiMoO4 precursor; dissolving selenium powder in hydrazine hydrate, adding water or a sodium molybdate aqueous solution, adding the substrate loaded with the NiMoO4 precursor, and carrying out a reaction at the temperature of 180-200 DEG C; and after the reaction is finished, obtaining the multiphase nano heterojunction material. The invention also provides the four-phase 1T / 2H-MoSe2-H / R-NiSe nano heterojunction material and the three-phase 1T / 2H-MoSe2-H-NiSe nano heterojunction material prepared by the method, and an application of the four-phase 1T / 2H-MoSe2-H / R-NiSe nano heterojunction material and the three-phase 1T / 2H-MoSe2-H-NiSe nano heterojunction material as an electrocatalyst for catalyzing a hydrogen evolution reaction under an alkaline condition. The multi-phase nano heterojunction material prepared by the method has a relatively large double-layer capacitance value, a larger electrochemical active area and smaller impedance, and the activity and stability of electro-catalytic hydrogen production are greatly improved.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a multiphase nanometer heterojunction material and its preparation method and application. Background technique [0002] Hydrogen energy generated by electrolysis of water is considered to be one of the most promising clean energy carriers due to its high energy density, no carbon emissions, and practicality in transportation and distribution. (F. Podjaski, D. Weber, S. Zhang, L. Diehl, R. Eger, V. Duppel, E. Alarcón-Lladó, G. Richter, F. Haase, A. Morral, C. Scheu and B.V. Lotsch, Nat.Catal., 2020, 3, 55–63.) Commercial noble metal catalysts exhibit low overpotential, low Tafel slope, and high current density in the hydrogen production reaction of electrolyzed water, but they face low natural abundance, high price, Serious bottleneck problems such as poor electrochemical stability. Therefore, the development of efficient, low-cost, and abundant raw materials f...

Claims

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Application Information

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IPC IPC(8): C25B11/061C25B11/091B82Y40/00B82Y30/00C25B1/04
CPCC25B11/061C25B11/091B82Y40/00B82Y30/00C25B1/04Y02E60/36
Inventor 郎建平薛江燕倪春燕
Owner SUZHOU UNIV
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