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Three-dimensional (3D) multi-stage structure VS2 hydrogen evolution electrocatalyst and preparation method thereof

An electrocatalyst and 3D technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of limited electrode active area, slow diffusion, poor conductivity, etc., and achieve suitable for large-scale production, The effect of low cost and low synthesis temperature

Active Publication Date: 2019-01-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained electrode has limited active area (blocked by binder), slow diffusion, and poor conductivity

Method used

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  • Three-dimensional (3D) multi-stage structure VS2 hydrogen evolution electrocatalyst and preparation method thereof
  • Three-dimensional (3D) multi-stage structure VS2 hydrogen evolution electrocatalyst and preparation method thereof
  • Three-dimensional (3D) multi-stage structure VS2 hydrogen evolution electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Cut the carbon cloth into a rectangle of 1 × 5 cm, activate it by refluxing in concentrated nitric acid at 120 °C for 1 hour, then wash it with ethanol and deionized water for 3 times, and dry it at 50 °C for 8 hours to obtain the treated carbon cloth;

[0022] (2) Weigh Na respectively 3 VO 4 ·12H 2 O, TAA (CH 3 CSNH 2 ) and P123 (PEO 20 PPO 70 PEO 20 ), the molar ratio is 1:4:0.1, dissolved in 25ml of deionized water, the concentration of vanadium source is 0.04mol / L, the concentration of sulfur source is 0.133mol / L, and the concentration of P123 is 0.0033mol / L. Magnetic stirring at room temperature for 40 min to obtain a clear solution;

[0023] (3) Put the carbon cloth treated in (1) into the reaction lining, pour the clear solution obtained in (2), seal it for hydrothermal reaction, set the reaction temperature to 160°C and the reaction time to 18h;

[0024] (4) After the reaction, the reaction kettle was naturally cooled to room temperature, and the ca...

Embodiment 2

[0027] (1) Cut the carbon cloth into a rectangle of 1 × 5 cm, activate it by refluxing in concentrated nitric acid at 80°C for 2 hours, then wash it with ethanol and deionized water for 4 times, and dry it at 50°C for 8 hours to obtain the treated carbon cloth;

[0028] (2) Weigh Na respectively 3 VO 4 ·12H 2 O, TAA (CH 3 CSNH 2 ) and P123 (PEO 20 PPO 70 PEO 20 ), the molar ratio is 1.5:5:0.2, dissolved in 35ml of deionized water, the concentration of vanadium source is 0.043mol / L, the concentration of sulfur source is 0.143mol / L, and the concentration of P123 is 0.0057mol / L. Magnetic stirring at room temperature for 40 min to obtain a clear solution;

[0029] (3) Put the carbon cloth treated in (1) into the reaction lining, pour the clear solution obtained in (2), seal it for hydrothermal reaction, set the reaction temperature to 180°C and the reaction time to 22h;

[0030] (4) After the reaction, the reaction kettle was naturally cooled to room temperature, and the c...

Embodiment 3

[0033] (1) Cut the carbon cloth into a rectangle of 1 × 5 cm, activate it by refluxing in concentrated nitric acid at 80°C for 2 hours, then wash it with ethanol and deionized water for 5 times, and dry it at 60°C for 7 hours to obtain the treated carbon cloth;

[0034] (2) Weigh Na respectively 3 VO 4 ·12H 2 O, TAA (CH 3 CSNH 2 ) and P123 (PEO 20 PPO 70 PEO 20 ), the molar ratio is 2:4.5:0.2, dissolved in 35ml deionized water, the concentration of vanadium source is 0.057mol / L, the concentration of sulfur source is 0.128mol / L, and the concentration of P123 is 0.0057mol / L. Magnetic stirring at room temperature for 60 min to obtain a clear solution;

[0035] (3) Put the carbon cloth treated in (1) into the reaction lining, pour the clear solution obtained in (2), seal it for hydrothermal reaction, set the reaction temperature to 180°C and the reaction time to 24h;

[0036] (4) After the reaction, the reaction kettle was naturally cooled to room temperature, the carbon c...

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Abstract

The invention provides a three-dimensional (3D) multi-stage structure VS2 hydrogen evolution electrocatalyst and a preparation method thereof. The electrocatalyst has a ball-flower-like spherical structure formed by stacking VS2 nanosheets. The preparation method comprises the steps of soaking a conductive carbon base in dispersoid containing Na3VO4.12H2O, CH3CSNH2 and a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (PEO-PPO-PEO) which have a molar ratio of (1-3) to (4-6) to (0.1-0.4), and carrying out a hydrothermal reaction to obtain the 3D multi-stage structure VS2 hydrogen evolution electrocatalyst. The nanosheets prepared by the method grow on a carbon cloth substrate so as to form a nano-flower with a 3D multi-stage structure. The 3D multi-stage structure nano-flower is very beneficial to free in and out of ions so as to expose more active sites, thus improving the electro-catalysis hydrogen evolution performance.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic hydrogen evolution catalysts, and in particular relates to a 3D multi-level structure VS 2 Hydrogen evolution electrocatalyst and preparation method thereof. Background technique [0002] Transition metal dichalcogenides have unique electrochemical and catalytic properties, which can be widely used in energy fields, such as lithium battery electrodes, catalysts, etc., and are a very important class of materials. Especially vanadium disulfide (VS 2 ) is more of a special concern. [0003] Vanadium disulfide has a unique layered structure, which is conducive to the adsorption and dissociation of ions, and can intercalate metal ions such as Li in different proportions, so it can be used as an electrode material, which can greatly improve the properties of the electrode. With the further in-depth understanding of the properties of vanadium disulfide, its application fields and application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00B82Y30/00B82Y40/00B01J27/04
CPCB82Y30/00B82Y40/00C01G31/00B01J27/04B01J37/10C01P2004/03C01P2002/72C01P2004/61B01J35/33
Inventor 黄剑锋徐瑞冯亮亮曹丽云杨丹刘倩倩
Owner SHAANXI UNIV OF SCI & TECH
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