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Preparation method of 3D porous electrode and its application in electrochemical hydrogen evolution reaction

A porous electrode, 3D technology, applied in the field of energy storage, can solve the problems of not providing enough space for mass transfer, limited pore structure, high metal consumption, etc., and achieve the effect of small batch difference, short time and high catalytic performance

Active Publication Date: 2018-06-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Advanced reports grow CoP directly on carbon cloth, but the materials reported above are mainly pure metals, and the consumption of metals is extremely high. On the other hand, the load in the preparation process needs to go through hydrothermal or electrodeposition processes. Satisfactory active materials can only be obtained after phosphating or vulcanization process
[0006] In addition, the interaction between electrode materials and carbon supports reported today is weak and the stability is poor.
More importantly, carbon cloth only acts as a carrier in their system, and the pore structure is limited, which cannot provide enough space for mass transfer during the reaction.

Method used

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  • Preparation method of 3D porous electrode and its application in electrochemical hydrogen evolution reaction
  • Preparation method of 3D porous electrode and its application in electrochemical hydrogen evolution reaction
  • Preparation method of 3D porous electrode and its application in electrochemical hydrogen evolution reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] The carbon cloth is acid washed with 0.5M sulfuric acid and washed with ethanol.

[0090] The treated carbon cloth was repeatedly immersed in a cobalt nitrate solution (0.1g / ml) 3 times. In the presence of melamine (8.2g), it undergoes the following pyrolysis process at 600°C for 1 hour and 700°C for 3.0 hours.

[0091] The scanning electron micrograph of the 3D porous electrode prepared in this example is shown in Figure 5a , It can be seen from the electron micrograph that the material prepared under this condition has a special structure of carbon tubes grown on the surface of carbon fibers in a large range, and the carbon tubes are short and evenly distributed. Figure 5b It is a transmission electron microscope image of a single carbon tube obtained after ultrasonication of the carbon cloth. It can be seen that the position of the end of the carbon tube peeled off by the ultrasound is wrapped with a piece of metal, and the diameter of the carbon tube is about 20nm. And...

Embodiment 2

[0093] The carbon cloth is acid washed with 0.5M sulfuric acid and washed with ethanol.

[0094] The treated carbon cloth was repeatedly immersed 6 times in a cobalt acetate solution (0.8 g / ml). In the presence of melamine (5.5g), it undergoes the following pyrolysis process at 600°C for 1 hour and 900°C for 1.5 hours.

[0095] The scanning electron micrograph of the 3D porous electrode prepared in this example is shown in Image 6 , It can be seen from the electron micrograph that the material prepared under this condition has a special structure of carbon tubes grown on the surface of carbon fibers in a large range, and the carbon tubes are short and evenly distributed.

Embodiment 3

[0097] The carbon cloth is acid washed with 0.5M sulfuric acid and washed with ethanol.

[0098] The treated carbon cloth was repeatedly immersed in a cobalt sulfate solution (0.7 g / ml) 3 times. In the presence of melamine (5g), it undergoes the following pyrolysis process at 600°C for 1 hour and 900°C for 3.5 hours.

[0099] The scanning electron micrograph of the 3D porous electrode prepared in this example is shown in Figure 7 , It can be seen from the electron micrograph that the material prepared under this condition has a special structure of carbon tubes grown on the surface of carbon fibers in a large range, and the carbon tubes are short and evenly distributed.

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Abstract

The invention discloses a 3D porous electrode preparation method and a use of a 3D porous electrode in electrochemical hydrogen evolution and belongs to the field of electrochemistry. The method comprises repeatedly impregnating a commercial carbon cloth with a transition metal salt, putting the commercial carbon cloth with the transition metal salt and a heat-labile nitrogen-containing monomer into a porcelain boat, and carrying out stepwise calcining treatment to obtain the 3D porous electrode comprising carbon tubes growing on the activated carbon cloth. The method has simple processes, less equipment investment and small batch difference and is suitable for large scale production. The 3D porous electrode has well-developed tunnel distribution, a high specific surface area and excellent conductivity. The 3D porous electrode can be used in the water electrolysis oxygen-evolution hydrogen-evolution reaction, can test hydrogen evolution reaction activity at a low temperature and has excellent catalytic performances.

Description

Technical field [0001] The invention relates to the field of energy storage, in particular to the design of a 3D porous electrode and its application in the electrochemical hydrogen evolution reaction. Background technique [0002] The porous electrode is an electrode designed to increase the actual surface area of ​​the electrode and reduce the polarization. It is an electrode structure often used in a variety of batteries (including electrolytic cells and chemical power sources). Generally, the mesh, particles and fine powder of the material are packed into porous electrodes through methods such as filling, crushing, sintering, and forming. According to the characteristics of electrode reaction, it can be divided into liquid / solid two-phase and gas / liquid / solid gas-phase porous electrodes. Porous electrodes are widely used because of their large specific surface area and high electrochemical reaction activity. [0003] With the increasingly severe environmental problems and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/03C25B11/12C25B1/04
CPCC25B1/04C25B11/031C25B11/043Y02E60/36
Inventor 王勇王静魏中哲王海燕
Owner ZHEJIANG UNIV
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