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A n,s co-doped graphene/molybdenum selenide/cofe-ldh airgel and its preparation

A graphene and co-doping technology, which is applied in the direction of graphene, binary selenium/tellurium compounds, cobalt compounds, etc., can solve the problems of low utilization efficiency, restrictions on widespread use, and scarce resources, and achieve low cost and batch production. The effect of small difference and safe operation

Active Publication Date: 2021-08-17
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although noble metal catalysts (such as Pt-based catalysts for hydrogen evolution reaction and Ir-based catalysts for oxygen evolution reaction) are currently the most promising catalysts for water splitting, their high price and scarcity of resources greatly limit their widespread use.
In recent years, a lot of research work has reported that non-noble metal catalysts catalyze hydrogen evolution or oxygen evolution in water, and some progress has been made, but these catalysts either catalyze the oxygen evolution reaction in alkaline electrolytes or catalyze Hydrogen evolution reaction, its water utilization efficiency is not high
Considering the practical application of water splitting, efficient electrocatalysts must catalyze both hydrogen evolution reaction and oxygen evolution reaction in the same electrolyte (mainly in alkaline electrolyte), which is a challenge for many current catalysts with high activity in acidic electrolytes. say still a challenge

Method used

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  • A n,s co-doped graphene/molybdenum selenide/cofe-ldh airgel and its preparation
  • A n,s co-doped graphene/molybdenum selenide/cofe-ldh airgel and its preparation
  • A n,s co-doped graphene/molybdenum selenide/cofe-ldh airgel and its preparation

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preparation example Construction

[0048] N, S co-doped graphene / MoSe of the preferred embodiment of the present invention 2 The preparation method of / CoFe-LDH comprises:

[0049] S1, ultrasonically disperse graphite oxide in deionized water to prepare a graphene oxide lamellar dispersion. Preferably, the concentration of the prepared graphene oxide sheet dispersion is 0.5-3mg mL -1 , more preferably 2mg mL -1 .

[0050] Specifically, the graphite oxide is prepared by the following method:

[0051] S11, under ice bath and vigorous stirring, NaNO 3 Add concentrated sulfuric acid until NaNO 3 completely dissolved.

[0052] For example: adding concentration to the three-necked reaction flask is 98% concentrated sulfuric acid (H 2 SO 4 ), and the reaction bottle was placed in an ice-water bath and stirred at 150rpm, adding NaNO 3 , and continue to stir in an ice-water bath to dissolve it. Wherein, the concentrated sulfuric acid and NaNO 3 The weight ratio is: 60:1~100:1.

[0053] S12, maintain ice bath,...

Embodiment 1

[0082] A kind of N,S co-doped graphene / MoSe 2 The preparation method of / CoFe-LDH airgel comprises:

[0083] (1) Preparation of graphene oxide (GO) lamellar dispersion: disperse 200 mg of the above-mentioned graphite oxide in 100 mL of deionized water, and ultrasonically disperse for 1 hour to obtain a tan GO lamellar dispersion with a GO concentration of 2 mg mL -1 .

[0084] (2) Preparation of ultra-thin MoSe by liquid phase exfoliation 2 Preparation of nanosheet dispersion: 20mg bulk MoSe 2 Add 4 mL of isopropanol (IPA) / water mixed solvent with a volume fraction of 60%, put it into an ultrasonic instrument and perform ultrasonic vibration treatment with a power of 200W and a frequency of 40kHz for 4 hours, and maintain the ultrasonic wave by adding circulating cooling water. The temperature was controlled at room temperature during the process. Subsequently, the sonicated solution was centrifuged at 4000 rpm for 20 min to remove the unexfoliated bulk MoSe at the bottom....

Embodiment 2

[0096] The reaction and operating conditions of this example are basically the same as those of Example 1, except that the reducing agent in Example 1 is ascorbic acid, and the crosslinking agent is polypyrrole.

[0097] According to the test, the composite airgel prepared by the present invention has excellent electrocatalytic water splitting performance as an electrocatalytic water splitting electrode, which is obtained by Figure 5-8 As shown, when the current density is 100mA / cm 2 , the overpotential of the hydrogen evolution reaction is -290mV, and the overpotential of the oxygen evolution reaction is 1.65V.

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Abstract

The invention provides a kind of N, S co-doped graphene / MoSe 2 The preparation method of / CoFe-LDH airgel is characterized in that, comprises the following steps: S1, prepare graphene oxide lamellar dispersion liquid, MoSe respectively 2 Nanosheet dispersion and layered CoFe-LDH nanosheet dispersion; S2, the graphene oxide sheet dispersion and MoSe 2 Mix the nanosheet dispersion, add reducing agent and crosslinking agent, mix evenly, and react to prepare N, S co-doped graphene / MoSe 2 Hydrogel, freeze-dried to obtain N,S co-doped graphene / MoSe 2 Airgel; S3, the N,S co-doped graphene / MoSe 2 Airgel soaked in layered CoFe‑LDH nanosheet dispersion for N,S co-doped graphene / MoSe 2 / CoFe‑LDH hydrogel, freeze-dried N, S co-doped graphene / MoSe 2 / CoFe‑LDH airgel. Ternary N, S co-doped graphene / MoSe prepared by the present invention 2 / CoFe‑LDH airgel has better hydrogen evolution and oxygen evolution performance under alkaline conditions.

Description

technical field [0001] The invention relates to an electrode hydrogen and oxygen evolution material, in particular to a N, S co-doped graphene / MoSe 2 / CoFe-LDH and its preparation method. Background technique [0002] Energy and the environment are the material basis for the survival and development of human society, and their importance is self-evident. In recent years, with the rapid growth of the world's population and the accelerated consumption of energy, problems such as energy shortage and environmental pollution have become increasingly serious, posing a huge threat to human survival and health. In view of this, there is an imminent human demand for new, sustainable and clean energy. Electrocatalytic water splitting is one of the important ways to efficiently generate renewable clean energy, and its decomposition products are only O 2 and H 2 , zero pollution to the environment, and O 2 and H 2 It can also be used as a raw material for fuel cells, so water spli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04C01B19/04C01B32/184C01B32/194C01G51/00B82Y30/00B82Y40/00
CPCY02E60/36
Inventor 徐小威贾润萍燕飞黄志雄赵呈
Owner SHANGHAI INST OF TECH
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