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Bifunctional water decomposition nano material based on metal oxide and preparation method thereof

A technology of nano-materials and oxides, applied in the field of nano-materials, can solve the problems of low catalytic hydrogen evolution efficiency and achieve the effects of good order, easy promotion and application, and large-scale preparation

Inactive Publication Date: 2020-10-16
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low catalytic hydrogen evolution efficiency of metal oxides, to provide a metal oxide-based bifunctional water-splitting nanomaterial with high catalytic activity and stable structure and its preparation method

Method used

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  • Bifunctional water decomposition nano material based on metal oxide and preparation method thereof
  • Bifunctional water decomposition nano material based on metal oxide and preparation method thereof
  • Bifunctional water decomposition nano material based on metal oxide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method based on metal oxide dual-function water splitting catalyst, the specific steps are as follows:

[0030] (A) Preparation of metal hydroxide precursor

[0031] The commercial nickel foam substrate is washed in dilute acid solution and deionized water to remove impurities on the surface, and finally dried with inert gas for use. Add 1.0 mmol Co(NO 3 ) 2 , 0.5mmol Cu(NO 3 ) 2 , 6 mmol urea was dissolved in 40 mL of deionized water solution and stirred for 15 min to obtain a dispersed mixed solution. Then put the cleaned foamed nickel substrate into a high-temperature hydrothermal reactor. The above dispersion solution was added to a high temperature hydrothermal reaction kettle with a foamed nickel substrate, and reacted at 120 ℃ for 6 h. After the reaction is finished, it is naturally cooled, and the substrate on which the metal hydroxide precursor is grown is taken out and washed with deionized water and ethanol for several times, and then dried in a va...

Embodiment 2

[0037] A preparation method based on a metal oxide dual-function water splitting catalyst is the same as in Example 1, wherein:

[0038] In step (a), Co(NO 3 ) 2 .6H 2 O and Cu (NO 3 ) 2 .6H 2 The molar ratio of O is 1:0.1; the hydrothermal reaction temperature is 100 ℃ and the reaction time is 1 h; in step (b), the high temperature heat treatment temperature is 300 ℃, the heating rate is 0.5 ℃ / min, and the reaction time is 2 h . The copper-cobalt-based oxide nanomaterials prepared in this embodiment obtained 10 mA cm in the total water splitting reaction. -2 The current density requires a voltage of 1.65 V.

Embodiment 3

[0040] A preparation method based on a metal oxide dual-function water splitting catalyst is the same as in Example 1, wherein:

[0041] In step (a), Co(NO 3 ) 2 .6H 2 O and Cu (NO 3 ) 2 .6H 2 The molar ratio of O is 1:10; the hydrothermal reaction temperature is 200 ℃, and the reaction time is 24 h; in step (b), the high temperature heat treatment temperature is 600 ℃, the heating rate is 50 ℃ / min, and the reaction time is 5 h . The copper-cobalt-based oxide nanomaterials prepared in this embodiment obtained 10 mA cm in the total water splitting reaction. -2 The current density requires a voltage of 1.82 V.

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Abstract

The invention belongs to the technical field of nano-materials, and particularly relates to a bifunctional water decomposition nano material based on metal oxide and a preparation method thereof. A commercial current collector is selected as a substrate, a chemical coprecipitation method is used for preparing a nano material precursor containing two or more metal ions, and then the corresponding metal oxide nano material is obtained through a thermal conversion method according to different thermal decomposition properties of different metal precursors. According to the prepared material, themetal oxide with high H * adsorption capacity can be integrated into a material system with excellent electrocatalytic oxygen production property so that the material finally has the capacity of catalytically decomposing water for hydrogen evolution and producing oxygen at the same time, and thus the purpose of completely decomposing water in an alkaline environment is achieved. The material prepared in the invention has the advantages of strong binding force with a current collector, regular and ordered structure, excellent conductivity and good mechanical and chemical stability, and the method has the advantages of simple process, low energy consumption, safety, reliability, convenience in large-scale preparation, and facilitation of popularization and application.

Description

Technical field [0001] The invention belongs to the technical field of nanomaterials, and specifically relates to a metal oxide-based dual-function water splitting nanomaterial and a preparation method thereof. Background technique [0002] The dual-function water-splitting material, because it can simultaneously catalyze the decomposition of water to produce hydrogen and oxygen, is environmentally friendly, can greatly save costs, and improve electrochemical conversion efficiency, and has received extensive attention. [0003] The existing preparation methods of dual-function water-splitting materials mainly include: ① Simple mechanical mixing, usually by mechanically mixing materials with excellent hydrogen evolution properties and oxygen generating properties through simple ultrasound or stirring. The disadvantages are: low catalytic activity, poor structural order, and lack of material control at the nanometer scale. ②In-situ growth is usually to grow oxygen-generating materia...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01G53/00C01G49/00B82Y40/00C25B11/06C25B1/04
CPCC01G51/00C01G53/00C01G49/00C01G51/60C01G53/08C25B1/04B82Y40/00C01P2004/03C01P2004/04Y02E60/36
Inventor 郑耿锋况敏
Owner FUDAN UNIV
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