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Boron-nitrogen co-doped diamond electrode and preparation method and application thereof

A diamond electrode and co-doping technology, which is applied in the direction of electrodes, electrolytic processes, and electrolytic components, can solve the problems of low surface active sites, weak electrocatalytic activity, and large diffusion resistance, and achieve improved electrocatalytic work efficiency and high Effect of hydrogen evolution and oxygen evolution potential, wide potential window

Pending Publication Date: 2018-04-27
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to solve the above problems, some people use boron-nitrogen co-doped diamond electrodes to electrocatalyze the reduction of carbon dioxide, but the surface active sites of boron-nitrogen co-doped diamond electrodes are low, the internal diffusion resistance is large, and the electrocatalytic activity is weak. The effect of electrocatalytic reduction of carbon dioxide is not very low ideal

Method used

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  • Boron-nitrogen co-doped diamond electrode and preparation method and application thereof
  • Boron-nitrogen co-doped diamond electrode and preparation method and application thereof
  • Boron-nitrogen co-doped diamond electrode and preparation method and application thereof

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preparation example Construction

[0035] see image 3 , the embodiment of the present invention provides a method for preparing a boron-nitrogen co-doped diamond electrode 100, comprising the following steps:

[0036] Step 1: taking the base body 1, sandblasting the base body 1, and cleaning the sand blasted base body 1;

[0037]Step 2: Depositing an initial boron-nitrogen co-doped diamond layer on the cleaned substrate 1 to obtain the substrate 1 with an initial boron-nitrogen co-doped diamond layer 2 on the surface;

[0038] Step 3: Etching the surface layer 2 of the initial boron-nitrogen co-doped diamond layer to obtain a boron-nitrogen co-doped diamond layer, that is, to obtain a boron-nitrogen co-doped diamond electrode, and the boron-nitrogen co-doped diamond electrode includes a substrate , a boron-nitrogen co-doped diamond layer arranged on the surface of the substrate, the boron-nitrogen co-doped diamond layer comprising a flat structure layer arranged on the surface of the substrate and an array pr...

Embodiment 1

[0052] A method for preparing a boron-nitrogen co-doped diamond electrode, comprising the following steps:

[0053] Step 1: Take the titanium substrate, and after sandblasting the titanium substrate, ultrasonically clean the titanium substrate in acetone and alcohol for 10 minutes respectively. Then place the titanium substrate in an acidic solution of sulfuric acid and hydrogen peroxide with a volume ratio of 1:15, heat it to 100°C, and soak for 30 minutes. Remove surface oxides and cause certain defects for subsequent deposition, and then use deionized water to ultrasonically clean for 10 minutes. Subsequently, the acid-washed titanium substrate was placed in the suspension of nano-diamond powder for ultrasonic treatment for 1 hour.

[0054] Step 2: Deposit a boron-nitrogen co-doped diamond layer on the cleaned titanium substrate by hot wire chemical vapor deposition. During the preparation process, the gases introduced include nitrogen, methane, trimethylborane and hydroge...

Embodiment 2

[0057] A method for preparing a boron-nitrogen co-doped diamond electrode, comprising the following steps:

[0058] Step 1: Take the silicon substrate, and ultrasonically clean the silicon substrate in acetone and alcohol for 10 minutes respectively. Then place the silicon substrate in an alkaline solution of hydrogen peroxide, ammonium hydroxide and water with a volume ratio of 1:1:5-10, heat to 80°C, and soak for 30 minutes. Remove surface oxides and cause certain defects for subsequent deposition, and then use deionized water to ultrasonically clean for 10 minutes. Then the alkali-washed silicon substrate was placed in nano-diamond powder suspension and ultrasonically treated for 2 hours.

[0059] Step 2: Deposit a boron-nitrogen co-doped diamond layer on the cleaned silicon substrate by hot wire chemical vapor deposition. During the preparation process, the gases introduced include nitrogen, methane, trimethylborane and hydrogen, nitrogen The flow rate was 124 sccm, the ...

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Abstract

The invention provides a boron-nitrogen co-doped diamond electrode comprising a matrix and a boron-nitrogen co-doped diamond layer arranged on the surface of the matrix. The boron-nitrogen co-doped diamond layer comprises a flat structure layer arranged on the surface of the matrix and an array protrusion structure arranged on the surface of the flat structure layer. According to the boron-nitrogen co-doped diamond electrode, the surface layer of the boron-nitrogen co-doped diamond layer is arranged to be the array protrusion structure, so that the specific surface area and active sites of theboron-nitrogen co-doped diamond layer are increased, and therefore the capacity of the electrode to conduct carbon dioxide electro-catalytic reduction is improved; and finally, the accumulation amount of the carbon dioxide in the atmosphere is reduced, and resource utilization of waste is achieved, and the practicability is high. The invention further provides a preparation method of the boron-nitrogen co-doped diamond electrode. According to the preparation method of the boron-nitrogen co-doped diamond electrode, the technology is simple, the cost is low, the boron-nitrogen co-doped diamondelectrode having an excellent carbon dioxide electro-catalytic reduction performance can be prepared, and the service life of the boron-nitrogen co-doped diamond electrode in severe environments is long.

Description

technical field [0001] The invention belongs to the technical field of novel functional thin film materials, and in particular relates to a boron-nitrogen co-doped diamond electrode and its preparation method and application. Background technique [0002] With the development of my country's economy, the extensive use of fossil fuels has led to an increase in carbon dioxide emissions. Electrocatalysis is a convenient and effective way to reduce carbon dioxide. At present, precious metal electrodes and diamond electrodes are commonly used in the industry. However, the current electrocatalytic reduction of carbon dioxide has many by-products, low energy utilization rate, and low catalyst activity. [0003] In order to solve the above problems, some people use boron-nitrogen co-doped diamond electrodes to electrocatalyze the reduction of carbon dioxide, but the surface active sites of boron-nitrogen co-doped diamond electrodes are low, the internal diffusion resistance is lar...

Claims

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Application Information

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IPC IPC(8): C25B3/04C25B11/06C23C16/27C23C16/56C25B3/25
CPCC23C16/271C23C16/278C23C16/56C25B3/25C25B11/091
Inventor 杨扬唐永炳李子豪谷继腾张文军
Owner SHENZHEN INST OF ADVANCED TECH
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