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Trace iron (III) ion-doped nickel disulfide catalyst for oxygen evolution reaction of electrolysis water

A technology of trinickel disulfide and oxygen evolution reaction, which is applied in the direction of electrolysis process, electrolysis components, electrolysis inorganic material coating, etc., to achieve the effect of less iron doping, low cost and excellent stability

Active Publication Date: 2019-01-01
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no research on the direct preparation of nickel disulfide materials doped with iron (III) ions by a simple electrochemical deposition method, and no research on the significant improvement of the catalytic activity of nickel disulfide materials doped with trace iron (III) ions to report

Method used

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  • Trace iron (III) ion-doped nickel disulfide catalyst for oxygen evolution reaction of electrolysis water
  • Trace iron (III) ion-doped nickel disulfide catalyst for oxygen evolution reaction of electrolysis water
  • Trace iron (III) ion-doped nickel disulfide catalyst for oxygen evolution reaction of electrolysis water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Mix the following raw materials evenly, add hydrochloric acid to control the pH value of the system to 4, and prepare the electrodeposition solution:

[0031]

[0032] 2. Put nickel foam as the working electrode, platinum sheet as the counter electrode, and saturated calomel electrode as the reference electrode, put it into the electrodeposition solution prepared in step 1, and conduct electrodeposition by cyclic voltammetry. The scanning range is -0.8V~ -0.2V, the scan rate is 20mV / s, and the number of cycles is 10 times, and the iron (III) ion-doped trinickel disulfide catalyst is directly deposited on the nickel foam.

[0033] Depend on figure 1 It can be seen that the catalyst has five diffraction peaks marked with asterisks at 21.7°, 31.1°, 37.8°, 49.7° and 55.2°, corresponding to Ni 3 S 2 (101), (110), (003), (113) and (122) crystal planes (JCPDS no.44-1418), indicating the presence of crystalline Ni in the catalyst 3 S 2 Mutually. In addition, the cata...

Embodiment 2

[0035] In the present embodiment, the addition of ferrous chloride is increased to 2g, and other steps are identical with embodiment 1, obtain the trinickel disulfide catalyst (see Figure 6 ).

Embodiment 3

[0037] 1. Mix the following raw materials evenly, add hydrochloric acid to control the pH value of the system to 3.5, and prepare the electrodeposition solution:

[0038]

[0039]

[0040] 2. Put nickel foam as the working electrode, platinum sheet as the counter electrode, and saturated calomel electrode as the reference electrode, put it into the electrodeposition solution prepared in step 1, and conduct electrodeposition by cyclic voltammetry. The scanning range is -0.8V~ -0.2V, the scan rate is 10mV / s, and the number of cycles is 30 times, and the nickel disulfide catalyst doped with iron (III) ions is directly deposited on the foamed nickel (see Figure 7 ).

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Abstract

The invention discloses a trace iron (III) ion-doped nickel disulfide catalyst for oxygen evolution reaction of electrolysis water. The trace iron (III) ion-doped nickel disulfide catalyst is characterized in that the molar content of iron element only accounts for 0.5% to 3% of the total molar quantity of iron, sulfur and nickel elements; the catalyst is prepared by taking a water solution containing nickel chloride, ferrous chloride, sodium thiosulfate, thiourea, PEG-100 and boric acid as an electrodeposition solution by a one-step electrodeposition method, wherein the sodium thiosulfate andthe thiourea are used as sulfur sources of the catalyst, the PEG-100 is used as a surfactant, and the boric acid is used as a pH (potential of hydrogen) buffer solution. The prepared trace iron (III)ion-doped nickel disulfide catalyst has the advantages that a nanosheet-shaped structure is adopted; by doping trace iron (III) ion, the catalyzing activity of the nickel disulfide catalyst in the oxygen evolution reaction is greatly improved, and the oxygen evolution over-potential is lower; the efficiency is high, the cost is low, and noble metal is not used.

Description

technical field [0001] The invention belongs to the technical field of electrolyzing water to prepare oxygen and hydrogen catalytic electrode materials, in particular to a nickel disulfide catalyst doped with a trace amount of iron (III) ions for the oxygen evolution reaction of electrolyzed water. Background technique [0002] Hydrogen is an environmentally friendly and green energy. The production of hydrogen by photocatalytic or electrocatalytic water splitting is an effective way to store intermittent sustainable energy, such as solar energy and wind energy, on a large scale. Electrocatalytic water splitting consists of two half-reactions, hydrogen evolution reaction and oxygen evolution reaction. In theory, only a voltage of 1.23V is required to occur. However, due to the generation of overpotential, the applied voltage is 1.8-2.0V, which is much higher than the theoretical voltage. . In industry, noble metals and their oxides such as ruthenium oxide or iridium oxide a...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06C25D9/04
CPCC25B1/04C25D9/04C25B11/075Y02E60/36
Inventor 王增林王丽媛
Owner SHAANXI NORMAL UNIV
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