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Non-noble metal hydrogen evolution electrocatalyst based on synergistic modification and preparation method thereof

A non-precious metal, synergistic modification technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve the problems of poor long-term working stability and high potential, and achieve optimized intrinsic activity, simple process, The effect of improving mass transfer performance

Active Publication Date: 2019-11-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in general, non-noble transition metal electrocatalysts still have disadvantages such as high overpotential of hydrogen evolution reaction and poor long-term working stability. Key problems to be solved urgently in the process of practical application

Method used

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  • Non-noble metal hydrogen evolution electrocatalyst based on synergistic modification and preparation method thereof
  • Non-noble metal hydrogen evolution electrocatalyst based on synergistic modification and preparation method thereof
  • Non-noble metal hydrogen evolution electrocatalyst based on synergistic modification and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0040] (1) With nickel foam (NF) as the carrier, its thickness is 1.85mm, and its surface density is 620±30g / m 2 , the aperture is 0.20 ~ 0.80mm. Nickel Foam (1×4cm 2 ) was ultrasonically cleaned with ethanol for 10 minutes and activated with 3M hydrochloric acid solution for 10 minutes, together with 30 mL of Ni(NO 3 ) 2 ·6H 2 O(0.1M), (NH 4 ) 6 Mo 7 o 24 4H 2 O(0.025M), (NH 2 ) 2 The deionized aqueous solution of CO (0.25M) was placed in a hydrothermal ax with a volume of 50mL, and after being treated at a constant temperature of 150°C for 18 hours, it was naturally cooled to room temperature. The prepared sample was fully cleaned and then vacuum dried at room temperature for 1 hour to obtain water Hot sample (NH 4 )HNi 2 (OH) 2 (MoO 4 ) 2 / NF.

[0041] (2) Place about 1 g of sodium hypophosphite and hydrothermal samples in a quartz boat at an interval of 1 cm, heat to 300 ° C under an argon atmosphere, and the heating rate is 2 ° C / min, and cool to room te...

Embodiment 2

[0056] (1) With nickel foam (NF) as the carrier, its thickness is 1.85mm, and its surface density is 620±30g / m 2 , the aperture is 0.20 ~ 0.80mm. Nickel Foam (1×4cm 2 ) was ultrasonically cleaned with ethanol for 10 minutes and activated with 3M hydrochloric acid solution for 10 minutes, together with 30 mL of Co(NO 3 ) 2 ·6H 2 O(0.02M), Na 2 MoO 4 2H 2 O (0.01M) deionized aqueous solution was placed in a hydrothermal ax with a volume of 50 mL, and after being treated at a constant temperature of 150 ° C for 6 hours, it was naturally cooled to room temperature. Hot sample CoMoO 4 ·nH 2 O.

[0057] (2) Place about 1 g of sodium hypophosphite and hydrothermal samples in a quartz boat at an interval of 1 cm, heat to 300 ° C under an argon atmosphere, and the heating rate is 2 ° C / min, and cool to room temperature after 3 hours of constant temperature treatment to prepare The target catalyst Co 3 P / CoMoO 4 / NF.

[0058] The hydrothermal state sample CoMoO obtained i...

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Abstract

The invention belongs to the technical field of hydrogen production materials, and discloses a non-noble metal hydrogen evolution electrocatalyst based on synergistic modification and a preparation method thereof. The catalyst is composed of a metal phosphide active phase, an oxide matrix phase and a carrier, wherein the metal phosphide active phase is dispersedly distributed on the surface of theoxide matrix phase in the form of fine nano-particles, and the oxide matrix phase is loaded on the carrier. According to the invention, the metal phosphide active phase is separated out through a phosphatization reaction and then combined with matrix oxide to construct synergistically catalytic active sites; moreover, the matrix oxide partially reduces the introduced oxygen vacancies, thereby being conducive to improving the electrical conductivity of the matrix material; in addition, when being heated, the precursor material generates a large amount of nano-pores due to dehydration or deamination, thus further improving the mass transfer performance of the catalyst while providing more active sites. Therefore, three factors intrinsic activity, number of active sites and electrical conductivity can be optimized simultaneously. The non-noble metal hydrogen evolution electrocatalyst based on synergistic modification is close to the noble metal Pt catalyst in comprehensive catalytic properties.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production materials, and in particular relates to a non-precious metal hydrogen evolution electrocatalyst based on synergistic modification and a preparation method thereof. Background technique [0002] Hydrogen is a clean and efficient energy carrier, and its large-scale industrial application is expected to fundamentally solve global problems such as energy shortage and environmental pollution. Therefore, the development of hydrogen energy utilization technology has become the focus of energy development strategies of countries around the world. To promote the industrial application of hydrogen energy, it is necessary to build a complete hydrogen energy industry chain including hydrogen production, hydrogen storage, hydrogen fuel cells and other links, of which hydrogen production is the source. Among the existing hydrogen production methods, electrolysis of water has the longest development ...

Claims

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Application Information

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IPC IPC(8): B01J27/19B01J35/02B01J35/10C25B1/04C25B11/06
CPCB01J27/19C25B1/04C25B11/04B01J35/33B01J35/40B01J35/61B01J35/647Y02E60/36
Inventor 王平陈政君胡文君曹国轩温禾
Owner SOUTH CHINA UNIV OF TECH
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