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Manganese dioxide super-long nanowire catalyst with oxygen vacancies as well as preparation method and application of manganese dioxide super-long nanowire catalyst

A technology of manganese dioxide and nanowires, applied in manganese oxide/manganese hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of insufficient activity of active sites and poor nitrogen adsorption capacity, etc. Achieve the effects of simple and adjustable preparation method, enhanced adsorption and activation, and enlarged contact area

Active Publication Date: 2021-06-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MnO 2 The long nanowire structure exposes a higher density of active sites, provides more adsorption sites for charge transfer reactions, and uses oxygen vacancy engineering to manipulate the electronic structure, solving the problems of poor nitrogen adsorption capacity and insufficient activity of active sites

Method used

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  • Manganese dioxide super-long nanowire catalyst with oxygen vacancies as well as preparation method and application of manganese dioxide super-long nanowire catalyst
  • Manganese dioxide super-long nanowire catalyst with oxygen vacancies as well as preparation method and application of manganese dioxide super-long nanowire catalyst
  • Manganese dioxide super-long nanowire catalyst with oxygen vacancies as well as preparation method and application of manganese dioxide super-long nanowire catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A MnO with oxygen vacancies 2 The preparation method of ultralong nanowire catalyst, the steps are as follows:

[0039] (1) Ultrasonic cleaning of carbon paper conductive substrate:

[0040] First cut with scissors to obtain a carbon paper conductive substrate with a size of 2cm×3cm, then ultrasonically clean it with dilute hydrochloric acid, acetone, and ethanol for 20 minutes, and finally store it in an ethanol solvent.

[0041] (2) One-step hydrothermal synthesis of MnO with oxygen vacancies 2 Ultra-long nanowires:

[0042] At room temperature, 3 mmol KMnO 4 Dissolve in 40 mL deionized water and stir magnetically for 20 minutes to obtain a purple solution. Then the solution is transferred to a reaction kettle with 50 milliliters of polytetrafluoroethylene liners, and the clean carbon paper obtained in (1) is placed in the kettle, subjected to hydrothermal reaction at 220° C. for 36 hours, and cooled naturally to obtain Uniform growth of MnO on paper 2 ultra-lon...

Embodiment 2

[0051] A MnO with oxygen vacancies 2 The preparation method of ultralong nanowire catalyst, the steps are as follows:

[0052] (1) Ultrasonic cleaning of carbon paper conductive substrate:

[0053] First cut with scissors to obtain a carbon paper conductive substrate with a size of 2cm×3cm, then ultrasonically clean it with dilute hydrochloric acid, acetone, and ethanol for 20 minutes, and finally store it in an ethanol solvent.

[0054] (2) One-step hydrothermal synthesis of MnO with oxygen vacancies 2 Ultra-long nanowires:

[0055] At room temperature, 2 mmol KMnO 4 Dissolve in 40 mL deionized water and stir magnetically for 20 minutes to obtain a purple solution. Then the solution is transferred to a reaction kettle with 50 milliliters of polytetrafluoroethylene liners, and the clean carbon paper obtained in (1) is placed in the kettle, subjected to hydrothermal reaction at 220° C. for 36 hours, and cooled naturally to obtain Uniform growth of MnO on paper 2 ultra-lon...

Embodiment 3

[0056] Embodiment 3 electrocatalytic nitrogen reduction experiment

[0057] 1. Test method:

[0058] The electrocatalytic nitrogen reduction ammonia production test was performed using a three-electrode H-type electrolytic cell device and recorded by an electrochemical workstation (CHI 750E). The electrolytic cell is separated by a Nafion membrane from the anode compartment and the cathode compartment. MnO with oxygen vacancies to be grown on carbon paper 2 The ultra-long nanowire (the product prepared in Example 1) was cut to 1 cm×1 cm as the working electrode, the carbon rod as the counter electrode, and the Ag / AgCl electrode as the reference electrode. The test was carried out at room temperature with 0.1mol / L sodium sulfate solution as the electrolyte.

[0059] 2. Electrocatalytic nitrogen reduction activity test:

[0060] MnO with oxygen vacancies grown on carbon paper 2 The ultra-long nanowire is used as the working electrode, and the cyclic voltammetry test is perf...

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Abstract

The invention relates to a manganese dioxide super-long nanowire catalyst with oxygen vacancies as well as a preparation method and application of the manganese dioxide super-long nanowire catalyst. The MnO2 super-long nanowire catalyst is of a 3D network structure composed of super-long MnO2 nanowires, the diameter of the nanowires is about 10 nm, the interplanar spacing is 0.69 nm, and the nanowires have lattice distortion and oxygen vacancies. The preparation method comprises the following steps: by taking carbon paper as a conductive substrate, putting the carbon paper into a potassium permanganate solution for hydrothermal reaction, and obtaining the MnO2 super-long nanowire catalyst on the carbon paper. In the hydrothermal reaction process, oxygen vacancies can be spontaneously formed, and the electronic structure of MnO2 is improved. Growth is carried out on the surface of the carbon paper to form a 3D structure, so that active sites with higher density can be exposed. The electro-catalysis nitrogen reduction performance can be effectively improved. Electro-catalytic nitrogen reduction can be carried out at room temperature.

Description

technical field [0001] The invention belongs to the technical field of manganese dioxide nanowires, and in particular relates to a manganese dioxide superlong nanowire catalyst with oxygen vacancies, a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Ammonia is the second largest chemical product in the world and is widely used to make fertilizers, medicines, dyes, explosives and resins. It is also considered as an energy carrier with no carbon footprint, high energy density and no carbon dioxide emissions. However, the current main way to produce ammonia on an industrial scale is the Haber-Bosch process, but this process requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/079C25B1/27B82Y40/00B82Y30/00C01G45/02
CPCC25B1/00B82Y40/00B82Y30/00C01G45/02C01P2004/16C01P2002/72C01P2004/03C01P2004/04C01P2002/84C01P2006/40C01P2002/78C01P2004/64
Inventor 黄柏标王光彬郑昭科王泽岩王朋程合锋张晓阳张倩倩
Owner SHANDONG UNIV
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