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Cobalt-based metal/metal oxide hydrogen evolution catalyst with out-phase junction as well as preparation and application of cobalt-based metal/metal oxide hydrogen evolution catalyst

A technology based on oxides and base metals, applied in the field of hydrogen evolution catalysts with fcc/hcp heterogeneous cobalt-based metals/metal oxides, can solve the problems of high electrode prices and restrictions on large-scale use, and achieve excellent catalytic activity, The method is simple and the effect of hydrogen evolution activity is good

Active Publication Date: 2022-07-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current mainstream catalysts used in electrolytic hydrogen production electrodes are still platinum-containing catalysts, and the electrodes themselves are expensive, which limits their large-scale use

Method used

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  • Cobalt-based metal/metal oxide hydrogen evolution catalyst with out-phase junction as well as preparation and application of cobalt-based metal/metal oxide hydrogen evolution catalyst
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  • Cobalt-based metal/metal oxide hydrogen evolution catalyst with out-phase junction as well as preparation and application of cobalt-based metal/metal oxide hydrogen evolution catalyst

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Embodiment 1

[0036] A preparation method of a heterogeneous junction cobalt-based metal / metal oxide hydrogen evolution catalyst, comprising the following steps:

[0037] (1) Conductive substrate pretreatment: Cut the pure copper sheet into a rectangle of 1x3.5cm size, first ultrasonically clean the cut pure copper sheet in acetone for 20 minutes, then ultrasonically clean it in absolute ethanol for 20 minutes, and after cleaning in acetone and Rinse with plenty of deionized water after cleaning with absolute ethanol.

[0038] (2) Cathode plasma electrodeposition: mix cobalt nitrate, lanthanum nitrate, sodium citrate, NMP with water to obtain a mixed solution, take this mixed solution as an electrolyte, and the concentration of cobalt nitrate in the electrolyte is 0.1mol / L, The concentration of lanthanum nitrate is 0.05mol / L, the concentration of sodium citrate is 0.05mol / L, the concentration of NMP is 8g / L, and the pH of the electrolyte is adjusted to 9 using the sodium hydroxide solution ...

Embodiment 2

[0041] A preparation method of a heterogeneous junction cobalt-based metal / metal oxide hydrogen evolution catalyst, comprising the following steps:

[0042] (1) Conductive substrate pretreatment: Cut the pure copper sheet into a rectangle of 1x3.5cm size, first ultrasonically clean the cut pure copper sheet in acetone for 20 minutes, then ultrasonically clean it in absolute ethanol for 20 minutes, and after cleaning in acetone and Rinse with plenty of deionized water after cleaning with absolute ethanol.

[0043] (2) Cathode plasma electrodeposition: mix cobalt nitrate, lanthanum nitrate, sodium citrate, NMP with water to obtain a mixed solution, take this mixed solution as an electrolyte, and the concentration of cobalt nitrate in the electrolyte is 0.15mol / L, The concentration of lanthanum nitrate is 0.1mol / L, the concentration of sodium citrate is 0.1mol / L, the concentration of NMP is 4g / L, and the pH of the electrolyte is adjusted to 9 by using 1mol / L sodium hydroxide solu...

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Abstract

The invention belongs to the technical field of hydrogen production through water electrolysis, and discloses a cobalt-based metal / metal oxide hydrogen evolution catalyst with an out-phase junction as well as preparation and application of the cobalt-based metal / metal oxide hydrogen evolution catalyst. The method comprises the following steps: by taking a conductive substrate as a cathode and a solution containing cobalt nitrate and lanthanum nitrate as an electrolyte, depositing a cobalt-based metal / metal oxide hydrogen evolution catalyst with an out-phase junction on the surface of the cathode through cathode plasma electrodeposition; the concentration of cobalt nitrate in the electrolyte is 0.05-0.2 mol / L, and the concentration of lanthanum nitrate in the electrolyte is 0.01-0.1 mol / L. The method is simple, and the hydrogen evolution catalyst with the heterogeneous structure is obtained. The catalyst provided by the invention has excellent hydrogen evolution catalytic activity. The catalyst is used for producing hydrogen by electrolyzing water.

Description

technical field [0001] The invention belongs to the field of hydrogen production by electrolysis of water, and in particular relates to a cobalt-based metal / metal oxide hydrogen evolution catalyst with fcc / hcp (fcc face-centered cubic lattice, hcp close-packed hexagonal lattice) heterophase junction and its preparation and application. Background technique [0002] For renewable energy, currently used solar energy, wind energy, etc. are severely limited by time and space, and the conversion efficiency is low, which hinders its further development. Hydrogen energy has high energy density, the product is water, and the source is abundant, which has broad development prospects, and the product of combustion is only water, so hydrogen is considered to be the most potential energy source in the future. [0003] At present, there are three main sources of hydrogen, natural gas methane reforming, water gas reforming and electrolysis of water to hydrogen production technology. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25D5/00C25D9/10C25D9/08C25B11/091
CPCC25B1/04C25D5/00C25D9/08C25D9/10C25B11/091Y02P20/133Y02E60/36
Inventor 张果戈雒翼航傅年庆穆松林于非
Owner SOUTH CHINA UNIV OF TECH
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