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Vermicular Ni/Ni<x>Fe<1-x>O<y> hydrogen evolution catalyst and preparation method thereof

A worm-like catalyst technology, applied in the field of electrocatalytic materials, can solve the problems of sufficient electrolyte contact, inhibition of catalytic activity, poor stability, etc., to avoid the use of binders, reduce contact resistance and charge transfer resistance, and stabilize strong effect

Active Publication Date: 2019-07-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the current Ni / NiO x Most hydrogen evolution catalysts have a core-shell structure, and the metal / oxide interface is wrapped in a thicker metal or oxide, which cannot fully contact the electrolyte, inhibiting its catalytic activity, and generally has the disadvantage of poor stability.
The poor stability is mainly due to the presence of a large number of hydrogen atoms at the hydrogen evolution end, which can reduce nickel oxide to metallic nickel and cause activity decay

Method used

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  • Vermicular Ni/Ni&lt;x&gt;Fe&lt;1-x&gt;O&lt;y&gt; hydrogen evolution catalyst and preparation method thereof
  • Vermicular Ni/Ni&lt;x&gt;Fe&lt;1-x&gt;O&lt;y&gt; hydrogen evolution catalyst and preparation method thereof
  • Vermicular Ni/Ni&lt;x&gt;Fe&lt;1-x&gt;O&lt;y&gt; hydrogen evolution catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Substrate pretreatment: Cut the pure copper sheet into a rectangle with a size of 1×3.5cm, clean the cut pure copper sheet ultrasonically in acetone for 20 minutes, then ultrasonically clean it in absolute ethanol for 20 minutes, and then use 10% Pickle with dilute sulfuric acid solution for 60s, take it out and ultrasonically clean it with deionized water to avoid acid residue, and rinse with a large amount of deionized water between each step.

[0043] (2) Electrodeposition of nickel nanosheets: Prepare a 0.3M nickel sulfate solution with deionized water, the temperature of the electrolyte is 25°C, and the electrodeposition time is 7 minutes. The sample pretreated in step (1) is clamped on the fixture. Electrodeposition was carried out on a CHI660 electrochemical workstation, using a three-electrode system, a graphite rod as a counter electrode, a saturated calomel electrode as a reference electrode, and a pretreated copper sheet as a working electrode. Constant volt...

Embodiment 2

[0046] (1) substrate pretreatment, same as embodiment 1 step (1);

[0047] (2) Electrodeposition of nickel nanosheets is the same as in Example 1 step (2);

[0048] (3) Vermicular Ni / Ni x Fe 1-x o y Preparation of hydrogen evolution catalyst: Prepare lye with deionized water, including 1mol / L sodium hydroxide, 0.2mol / L ammonium fluoride and 0.3g / L CTAB, and then separately prepare 0.2mol / L nickel acetate solution and 0.2mol / L L of ferrous ammonium sulfate solution, put the lye in a YLD-6000 low-temperature water bath to keep the temperature constant, set the temperature at 85°C, and keep it warm for 20 minutes, then use a disposable rubber head dropper to mix the prepared nickel acetate solution and sulfurous acid The ferric ammonium solution is gradually added dropwise to the alkaline solution until a small amount of precipitation occurs in the solution. Afterwards, place the electrodeposited nickel nanosheets in lye, soak for 2 hours, take them out, rinse them with deion...

Embodiment 3

[0050] (1) substrate pretreatment, same as embodiment 1 step (1);

[0051] (2) Electrodeposition of nickel nanosheets is the same as in Example 1 step (2);

[0052] (3) Vermicular Ni / Ni x Fe 1-x o y Preparation of hydrogen evolution catalyst: Prepare lye with deionized water, including 1mol / L sodium hydroxide, 0.2mol / L ammonium fluoride and 0.2g / L CTAB, and then separately prepare 0.2mol / L nickel acetate solution and 0.2mol / L L of ferrous ammonium sulfate solution, put the sodium hydroxide solution in a YLD-6000 low-temperature water bath to keep the temperature constant, set the temperature at 65°C, keep it warm for 20 minutes, and use a disposable plastic head dropper to mix the prepared nickel acetate solution and The ferrous ammonium sulfate solution is gradually added dropwise to the lye until a small amount of precipitation occurs in the solution. Afterwards, place the electrodeposited nickel nanosheets in lye, soak for 3 hours, take them out, rinse them with deioniz...

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Abstract

The invention belongs to the field of electrocatalytic materials, and discloses a vermicular Ni / Ni<x>Fe<1-x>O<y> hydrogen evolution catalyst and a preparation method thereof. The preparation method comprises the steps of: placing a pretreated pure copper substrate in a nickel salt electrolyte, and depositing nickel nanosheets on the substrate through electrodeposition; preparing an alkaline aqueous solution containing sodium hydroxide, ammonium fluoride and CTAB; and then dropwise adding a nickel acetate solution and an ammonium ferrous sulfate solution until precipitates are generated in thesolution to obtain a nickel ion and ferrous ion saturated alkali liquor, then putting the substrate subjected to electrodeposition into the nickel ion and ferrous ion saturated alkali liquor for soaking treatment, taking out the substrate after the treatment is completed, and conducting cleaning and drying to obtain the vermicular Ni / Ni<x>Fe<1-x>O<y> hydrogen evolution catalyst. The preparation method is simple, oxide dispersion distribution is achieved, a metal / oxide interface is added, iron modification is beneficial to improvement of stability, and good application prospects are achieved inthe field of electrocatalysis.

Description

technical field [0001] The invention belongs to the field of electrocatalytic materials, in particular to a worm-like Ni / Ni x Fe 1-x o y Hydrogen evolution catalyst and its preparation method. Background technique [0002] With the reduction of fossil fuels and the increasingly serious environmental pollution, countries around the world are committed to the development and research of sustainable new energy. Among them, hydrogen energy, as a secondary energy source, has become the most promising new energy source for realizing the sustainable development of the world in the future because of its large energy calorific value, renewable, pollution-free, convenient transportation and storage and other advantages. [0003] Among many hydrogen production methods, electrolytic water hydrogen production technology is more mature than other technologies, with high efficiency, simple process, convenient operation, high purity hydrogen and no pollution. The raw material is water ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C25B1/04C25B11/06
CPCB01J23/755C25B1/04C25B11/091B01J35/33Y02E60/36
Inventor 张果戈姚芯马晓李文芳
Owner SOUTH CHINA UNIV OF TECH
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