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Photoelectric synergistic capacitive deionization electrode material and preparation method and application thereof

A technology for capacitive deionization and electrode materials, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of semiconductor catalysts lacking surface porous structure, unable to provide adsorption surface for electrolyte ions, and limiting the specific capacitance of electrode materials. , to achieve the effect of promoting electrostatic adsorption of ions, simple and stable preparation method, and easy large-scale production

Active Publication Date: 2021-08-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing light-driven capacitive deionization technology is usually based on semiconductor photocatalysts, such as: a device and method for light-driven capacitive deionization disclosed in Chinese patent literature with publication number CN110510715A, using coating method, dipping-pull method or The spraying method loads the photocatalyst on the current collector substrate to convert light energy into electrical energy, but the photogenerated carriers in the photocatalyst are easy to recombine, the quantum efficiency is low, and the adsorption efficiency of the overall device is limited.
In addition, the semiconductor catalyst prepared by this method lacks surface porous structure, which cannot provide sufficient adsorption surface for electrolyte ions, which limits the specific capacitance of electrode materials.

Method used

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  • Photoelectric synergistic capacitive deionization electrode material and preparation method and application thereof
  • Photoelectric synergistic capacitive deionization electrode material and preparation method and application thereof
  • Photoelectric synergistic capacitive deionization electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The preparation method of photoelectric synergistic capacitive deionization electrode material includes the following steps: placing a conductive substrate in a plasma-enhanced chemical vapor deposition tube, feeding a mixed gas of hydrogen and methane, the gas flow ratio is 10:1, the air pressure is 40Pa, and the inductor is turned on. Coupled plasma source, the power is set to 250W. After the chemical vapor deposition reaction was carried out at 700°C for 60 minutes, 10mL / min nitrogen gas was passed into it for cooling. The height of the standing graphene nanosheets on the conductive substrate was about 1 μm, the length of the single sheet was about 400nm, and the thickness of the top edge was 3nm. The load density is about 0.15mg / cm 2 ; The obtained standing graphene nanosheet / conductive substrate is placed in the plasma ozone generator, the ozone concentration is 200ppm, and it is maintained for 3min; using cyclic voltammetry, the sweep rate is set to 20mV / s, and th...

Embodiment 2

[0053] The difference from Example 1 is that the chemical vapor deposition reaction time is 10min, the height of the obtained standing graphene nanosheets on the conductive substrate is about 0.5 μm, the length of the single piece is about 300nm, the thickness of the top edge is 2nm, and the loading density About 0.1mg / cm 2 .

Embodiment 3

[0055] Different from Example 1, the chemical vapor deposition reaction time is 180min, and the height of the obtained standing graphene nanosheet on the conductive substrate is about 2 μm, the length of the single piece is about 800nm, the thickness of the top edge is 5nm, and the loading density is about 2 μm. 0.30mg / cm 2 .

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Abstract

The invention discloses a photoelectric synergistic capacitive deionization electrode material which comprises a standing type graphene nanosheet and an electrode active material dispersed among pores of the standing type graphene nanosheet, wherein the top edge of the standing type graphene nanosheet is exposed outside. The preparation method comprises the following steps: performing plasma enhanced chemical vapor deposition on the conductive substrate, introducing methane or mixed gas of hydrogen and methane, starting a plasma source, and introducing inert gas to obtain a standing graphene nanosheet / conductive substrate; placing in a plasma ozone generator, and carrying out hydrophilic treatment; by means of a cyclic voltammetry method, loading manganese dioxide pseudocapacitance active nano material through an electrodeposition method with an electrolyte being manganese acetate solution. The invention also discloses an application of the photoelectric synergistic capacitive deionization electrode material in adsorption desalination. The photoelectric synergistic capacitive deionization electrode material has the advantages of high adsorption capacity, high charging efficiency and high desalination rate.

Description

technical field [0001] The invention relates to the technical field of capacitive deionization, in particular to a photoelectric cooperative capacitive deionization electrode material and its preparation method and application. Background technique [0002] With the rapid growth of the global population and the rapid expansion of industrial scale, the demand for clean water resources in various countries is increasing, and water resource security has become one of the key issues affecting human survival and development. However, the existing fresh water resources only account for 2.7% of the earth's total water resources, and there is a prominent problem of uneven spatial distribution. In view of the extremely wide distribution and huge reserves of seawater and brackish water resources on the earth, it has become an important task to develop an efficient and environmentally friendly water desalination technology. Capacitive deionization (CDI) is an emerging desalination tec...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F103/08
CPCC02F1/4691C02F2103/08
Inventor 薄拯徐晨轩杨化超黄哲崧严建华岑可法
Owner ZHEJIANG UNIV
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