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Gas diffusion electrode, its preparation method and its application in the electrochemical reduction of carbon dioxide

A gas diffusion electrode and carbon dioxide technology, applied in the field of electrochemical catalysis, can solve the problems of low energy utilization rate of electrochemical reduction of carbon dioxide, easy deactivation of catalyst, poor product selectivity, etc., to increase the catalytic activity of electrochemical reduction and inhibit hydrogen evolution Reaction, the effect of increasing the contact area

Active Publication Date: 2020-06-16
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the low energy utilization rate of electrochemical reduction of carbon dioxide, poor product selectivity, and easy deactivation of catalysts are the main factors that limit its application. The key to solving this problem is to develop electrode materials with specific selectivity and high catalytic activity.

Method used

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  • Gas diffusion electrode, its preparation method and its application in the electrochemical reduction of carbon dioxide
  • Gas diffusion electrode, its preparation method and its application in the electrochemical reduction of carbon dioxide
  • Gas diffusion electrode, its preparation method and its application in the electrochemical reduction of carbon dioxide

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Effect test

Embodiment 1

[0044] Embodiment 1: catalyst preparation

[0045] Weigh 10g of urea and 1g of anhydrous copper acetate, mix urea and anhydrous copper acetate evenly and physically to obtain a catalyst precursor, place the catalyst precursor in a 30mL crucible with a lid, and place it in a muffle furnace for pyrolysis Reaction, the reaction temperature is 400°C, the heating rate is 5°C / min, and the reaction time is 2h. The obtained solid is ground to obtain graphite-phase carbon nitride-supported nano-copper oxide, which is the carbon dioxide electrochemical reduction catalyst, called Cu x O@C 3 N 4 -400°C catalyst.

Embodiment 2

[0046] Embodiment 2: catalyst preparation

[0047] The specific preparation process is as shown in Example 1. Only by changing the reaction temperature to 450°C, the graphite-phase carbon nitride-supported nano-copper oxide can also be obtained, which is called Cu x O@C 3 N 4 -450°C catalyst. For Cu in Example 2 x O@C 3 N 4 XRD characterization of the catalyst at -450°C, such as figure 1 As shown, it can be seen that the catalyst includes graphite phase carbon nitride and nano-copper oxides in two crystal forms of cupolite and cuprite.

Embodiment 3

[0048] Embodiment 3: catalyst preparation

[0049] The specific preparation process is as shown in Example 1. Only by changing the reaction temperature to 500 ° C, can also obtain graphite-phase carbon nitride-supported nano-copper oxide, called Cu x O@C 3 N 4 -500°C catalyst. For Cu in Example 3 x O@C 3 N 4 XRD characterization of the catalyst at -500°C, such as figure 1 As shown, it can be seen that the catalyst includes graphite phase carbon nitride and nano-copper oxides in two crystal forms of cupolite and cuprite.

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Abstract

The invention relates to a gas diffusion electrode, its preparation method and its application in the electrochemical reduction of carbon dioxide. The gas diffusion electrode includes a gas diffusion electrode body, and a carbon dioxide electrochemical reduction catalyst supported on the gas diffusion electrode body; the carbon dioxide electrochemical reduction catalyst is a graphite-phase carbon nitride-supported nano-copper oxide, and the nano-copper oxide It has two crystal forms of copperite and cuprite. The gas diffusion electrode can improve the faradaic efficiency of producing hydrocarbons such as methane and ethylene in the electrochemical reduction of carbon dioxide, and can also effectively inhibit the hydrogen evolution reaction.

Description

technical field [0001] The invention relates to the field of electrochemical catalysis, in particular to a gas diffusion electrode, its preparation method and its application in the electrochemical reduction of carbon dioxide. Background technique [0002] Carbon dioxide electrochemical reduction is an important direction of carbon dioxide resource utilization technology, which can convert carbon dioxide into gaseous carbon monoxide, methane, ethylene, ethane, propylene, propane and liquid formic acid, methanol, formaldehyde, acetic acid, ethanol, ethane Aldehyde, ethylene glycol, oxalic acid and other substances produce economically valuable chemicals while slowing down the greenhouse effect brought by carbon dioxide. They have dual benefits of environment and economy, and have received extensive attention in recent years. [0003] Carbon dioxide is the product of the highest oxidation stage of carbon. From the perspective of chemical change, it is in a stable state, close ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/04C25B11/06C25B11/12B01J23/72C25B3/25
CPCB01J23/72B01J35/0033C25B3/25C25B11/051C25B11/091
Inventor 傅杰黎梓浩吕秀阳欧阳平凯
Owner ZHEJIANG UNIV
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