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Polypyrrole/nano-copper composite gas diffusion electrode and preparation and application thereof

A gas diffusion electrode and composite gas technology, applied in electrodes, electrolysis processes, electrolysis components, etc., can solve the problems of difficulty in completely cracking the greenhouse effect, reduced energy utilization, high hydrogen evolution side reactions, etc. The effect of improving Faraday efficiency

Inactive Publication Date: 2016-02-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The deep burial storage method of carbon dioxide has a certain positive effect on reducing the greenhouse effect, but it is difficult to completely solve the greenhouse effect, let alone recycle it
However, due to the slow electrochemical kinetics of carbon dioxide, a large overpotential is often required, resulting in a high hydrogen evolution side reaction, which leads to a decrease in energy utilization.

Method used

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  • Polypyrrole/nano-copper composite gas diffusion electrode and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Soak Toray030 carbon paper in concentrated nitric acid for 12 hours at room temperature, rinse the soaked carbon paper three times with deionized water and absolute ethanol, and then blow dry with argon. Cut the dried carbon paper into a square carbon paper with a size of 15mm*20mm, use copper foil as the current collector, and use a polyester frame as the frame, and press it at 0.6MPa and 100 degrees for 1 minute to obtain the following: Base electrode; put the base electrode into an aqueous solution containing 0.1mol / L lithium perchlorate and 0.15mol / L pyrrole, and perform constant potential polymerization at 0.855V for 5min to obtain a polypyrrole gas diffusion electrode with a thickness of 0.3μm; Then, put the electrode into a mixed solution of 0.15 mol / L copper sulfate and 0.5 mol / L sulfuric acid, and conduct potentiostatic polymerization at -0.65 V for 5 minutes to obtain a polypyrrole / nano-copper composite gas diffusion electrode.

[0019] Soak Toray030 carbon pa...

Embodiment 2

[0022] Soak Toray060 carbon paper in concentrated nitric acid for 24 hours at room temperature, rinse the soaked carbon paper three times with deionized water and absolute ethanol, and then blow dry with argon. Cut the dried carbon paper into 15mm*20mm square carbon paper, use copper foil as current collector, use polyester frame as frame, heat press at 0.8MPa, 130 degrees for 1 minute, you can get the following Base electrode; put the base electrode into an aqueous solution containing 0.05mol / L sodium p-toluenesulfonate and 0.3mol / L pyrrole, and conduct potentiostatic polymerization at 0.855V for 5min to obtain a polypyrrole gas diffusion electrode with a thickness of 0.3μm Then, put the electrode into a mixed solution of 0.5mol / L copper sulfate and 0.5mol / L sulfuric acid, and conduct potentiostatic polymerization at -0.85V for 5min to obtain a 0.8μm polypyrrole / nano-copper composite gas diffusion electrode.

[0023] Soak Toray060 carbon paper in concentrated nitric acid for ...

Embodiment 3

[0025] Soak the carbon cloth in concentrated nitric acid for 24 hours at room temperature, rinse the soaked carbon paper three times with deionized water and absolute ethanol, and then blow dry with argon. Cut the dried carbon paper into 15mm*20mm square carbon paper, use copper foil as current collector, use polyester frame as frame, heat press at 0.6MPa, 100 degrees for 1 minute, and the substrate can be obtained electrode; put the base electrode into an aqueous solution containing 0.1mol / L potassium hydrogensulfate and 0.5mol / L pyrrole, and conduct potentiostatic polymerization at 0.855V for 5min to obtain a 0.3μm polypyrrole gas diffusion electrode; then, the Put the electrode into a mixed solution of 0.5mol / L copper sulfate and 0.5mol / L sulfuric acid, and conduct potentiostatic polymerization at -1.05V for 5min to obtain a 1.0μm polypyrrole / nano-copper composite gas diffusion electrode.

[0026] Soak the carbon cloth in concentrated nitric acid for 24 hours at room temper...

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Abstract

The invention relates to a polypyrrole / nano-copper composite gas diffusion electrode and preparation and an application thereof. Carbon paper or carbon cloth serves as a substrate, a polypyrrole layer with the thickness being 0.05-1.0 [mu]m is attached to the surface of the substrate, and a nano-copper material layer with the thickness being 0.1-1.0 [mu]m is deposited on the polypyrrole layer. Polypyrrole is aggregated and nano-copper is deposited on the carbon-based electrode, the hydrogen evolution side reaction is reduced, and the Faradic efficiency of products is improved and the conversion rate of carbon dioxide is increased.

Description

Technical field: [0001] The invention relates to the electrochemical reduction of carbon dioxide, belongs to the technical field of resource utilization of carbon dioxide, and specifically relates to the reduction of carbon dioxide by polypyrrole / nanometer copper to produce organic compounds. Background technique: [0002] With the continuous growth of the world's population and the rapid development of modern industry, especially the industrial development of fossil fuels as the main energy source, the emission of carbon dioxide continues to increase, leading to global warming has become an urgent problem to be solved. As the most important greenhouse gas in the world, carbon dioxide emission reduction has become a topic of global concern and a research hotspot. [0003] Reducing the use of fossil fuels while converting carbon dioxide into other chemical raw materials is an important way to reduce carbon dioxide emissions. The deep burial storage method of carbon dioxide h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/12C25B3/04C25B3/25
Inventor 毛景霞张华民钟和香邱艳玲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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