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A kind of preparation method of the doped phosphoric acid group Ni-Fe hydroxide nano film catalyst for decomposing water

A phosphoric acid group and hydroxide technology, which is applied in the field of preparation of a phosphoric acid group-doped Ni-Fe hydroxide nano-film catalyst for water splitting, can solve problems such as unreported, and achieve low cost and catalytic performance. The effect is good, the method is simple

Inactive Publication Date: 2018-10-23
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of the above electrode materials are mainly hydrothermal method and sol-gel method, but there is no report on the preparation of Ni-Fe hydroxide materials doped with phosphoric acid groups by electrochemical methods and the catalytic electrode materials for electrolysis of water.

Method used

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  • A kind of preparation method of the doped phosphoric acid group Ni-Fe hydroxide nano film catalyst for decomposing water
  • A kind of preparation method of the doped phosphoric acid group Ni-Fe hydroxide nano film catalyst for decomposing water
  • A kind of preparation method of the doped phosphoric acid group Ni-Fe hydroxide nano film catalyst for decomposing water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Mix the following raw materials evenly to prepare electrodeposition solution:

[0030]

[0031]

[0032] 2. Take the nickel foam substrate as the working electrode, the carbon rod as the counter electrode, and the Ag / AgCl electrode (3mol / L KCl) as the reference electrode, put it into the electrodeposition solution prepared in step 1, and conduct electrodeposition by cyclic voltammetry. The scanning range is -1 to 0.4V, the scanning rate is 10mV / s, and the cycle is 40 times, and the Ni-Fe hydroxide nano-film catalyst doped with phosphoric acid groups is directly deposited on the surface of the nickel foam substrate. Depend on Figure 1~4 It can be seen that the nano-film deposited on the surface of nickel foam contains Ni, Fe, P and O elements, and the XPS spectrum is calibrated by the C 1s (284.8eV) standard, in which Ni and Fe mainly exist in divalent forms, and there are also PO 4 3- , proving that the prepared nanofilm is Ni-Fe hydroxide doped with phospho...

Embodiment 2

[0034] 1. Mix the following raw materials evenly to prepare electrodeposition solution:

[0035]

[0036] 2. Take the nickel foam substrate as the working electrode, the carbon rod as the counter electrode, and the Ag / AgCl electrode (3mol / L KCl) as the reference electrode, put it into the electrodeposition solution prepared in step 1, and conduct electrodeposition by cyclic voltammetry. The scanning range is -1.2~0.2V, the scanning rate is 5mV / s, and the cycle is 30 times, and the Ni-Fe hydroxide nano-film doped with phosphoric acid groups is directly deposited on the surface of the nickel foam substrate.

Embodiment 3

[0038] 1. Mix the following raw materials evenly to prepare electrodeposition solution:

[0039]

[0040] 2. Take the nickel foam substrate as the working electrode, the carbon rod as the counter electrode, and the Ag / AgCl electrode (3mol / L KCl) as the reference electrode, put it into the electrodeposition solution prepared in step 1, and conduct electrodeposition by cyclic voltammetry. The scanning range is -1.4~0V, the scanning rate is 20mV / s, and the cycle is 80 times, and the Ni-Fe hydroxide nano-film doped with phosphoric acid groups is directly deposited on the surface of the nickel foam substrate.

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Abstract

The invention discloses a preparing method for a phosphate group Ni-Fe hydroxide doped nano-film catalyst used for decomposing water. The method includes the steps that an aqueous solution containing NiCl2, FeCl2 and NaH2PO2 serves as electrolytic deposition liquid; and an electrolytic deposition method is adopted for direct electrolytic deposition of the phosphate group Ni-Fe hydroxide doped nano-film catalyst on the surface of a metal strip or foam metal substrate. The preparing method is simple and low in cost; the obtained catalyst is used for catalyzing of water decomposing, and has the good functions of reducing electrolysis water oxygen evolution and hydrogen evolution reaction overpotential under large electric current density; and the catalytic activity is higher, and the catalyst is not prone to dropping from the surface of the substrate.

Description

technical field [0001] The invention belongs to the technical field of electrolyzing water to prepare oxygen and hydrogen catalytic electrode materials, and in particular relates to a preparation method of a phosphoric acid group-doped Ni-Fe hydroxide nanometer film catalyst for decomposing water. Background technique [0002] Due to the influence of overpotential, the voltage provided in the process of electrolyzing water is much higher than the theoretical potential (1.23V), which leads to serious power loss and increased cost. In the industry, platinum is used as the cathode, and noble metals such as ruthenium oxide or iridium oxide are used as the anode, and the overpotential required for water splitting is reduced by electrocatalysis. However, the scarcity and high price of these precious metals limit their large-scale use in the electrolytic water industry. For this reason, in recent years, a large number of scientific researchers have focused on the research of low-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B1/04C25D9/04
CPCC25B1/04C25D9/04C25B11/091Y02E60/36
Inventor 王增林雷占武
Owner SHAANXI NORMAL UNIV