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Preparation method of coating for difunctional catalyst applied to electrolysis of water

A catalyst and water electrolysis technology, applied in the field of water electrolysis, can solve the problem of high preparation cost, and achieve the effects of simple preparation process, excellent hydrogen evolution and oxygen evolution catalytic performance, and strong stability

Active Publication Date: 2022-02-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These nanocatalysts are usually prepared by a series of chemical reactions and physical treatment steps, the preparation cost is high, and the stable loading of nanopowders on the substrate electrode to ensure long-term electrolytic operation is also a problem

Method used

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  • Preparation method of coating for difunctional catalyst applied to electrolysis of water
  • Preparation method of coating for difunctional catalyst applied to electrolysis of water
  • Preparation method of coating for difunctional catalyst applied to electrolysis of water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a bifunctional electrolytic water catalyst coating, the method comprising the following steps:

[0027] (1) Base material selection and pretreatment

[0028] The polycrystalline graphite rod is selected as the base electrode material, and its circular cross-section is used as the electrode surface, with an area of ​​0.0707cm 2 ; The side is insulated and sealed, and the surface of the electrode is smoothed on 800-grit sandpaper.

[0029] The base electrode was ultrasonically cleaned in 3.0mol / L HCl for 10 minutes, then ultrasonically cleaned in water and absolute ethanol for 2 minutes each, rinsed with running water, dried, and set aside.

[0030] (2) The first step of plating

[0031] Prepare 40ml of electroplating solution, which contains 0.3mol / L nickel nitrate, 0.1mol / L phosphomolybdic acid, 0.3mol / L, sodium citrate, and 0.1mol / L boric acid.

[0032] At room temperature of 25°C, using constant current method, with the substrate electrode as...

Embodiment 2

[0039] The difference between this embodiment and Embodiment 1 is that the base electrode material is different. In this embodiment, a nickel mesh with a thickness of 1.0mm is selected as the base electrode material, and a thickness of 5.0×5.0cm is selected. 2 The surface of the material is the electrode surface, and the surface of the material is free of grinding. The cleaning of the nickel mesh base electrode, the electroplating solution and the plating conditions of the first step and the second step of plating are all the same as in Example 1.

[0040] The electrochemical test is the same as in Example 1. The voltage-time curve of the two electrodes for total water splitting is shown in Figure 4 and Figure 5 . From Figure 4 and Figure 5 It can be concluded that in 1.0mol / L KOH, when the catalytic electrode is based on nickel mesh, the total water splitting current density is 10mA / cm 2 with 300mA / cm 2 , the required voltages are about -1.61V and -2.37V respective...

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Abstract

The invention discloses a preparation method of a coating for a difunctional catalyst applied to electrolysis of water. The preparation method comprises the following steps: with graphite, Ni, Fe, Cu and other metals and netted metals thereof as a conductive substrate, sequentially carrying out acid pickling, alcohol washing, water washing, drying and other pretreatment on the conductive substrate for later use; with an acidic aqueous solution containing phosphomolybdic acid, nickel nitrate, sodium citrate and boric acid as an electroplating solution, conducting cathode plating on a substrate electrode at a normal temperature by adopting a constant current method, wherein current density is 30-75 mA / cm<2>, and plating time is 30-60 min; and with an aqueous ferric nitrate solution as an electroplating solution,conducting secondary cathode plating on the substrate at a normal temperature by adopting a constant potential method, wherein a potential ranges from -1.0 V to -1.5 V, and plating time ranges from 60 min to 120 min. The Ni-Mo-Fe-O-B-P compound high-efficiency catalyst coating prepared by the method has the functions of catalyzing hydrogen evolution and oxygen evolution at the same time, the preparation process of the catalyst is simplified, material and preparation cost is reduced, and the stability of long-time operation of the electrode is improved.

Description

technical field [0001] The invention relates to the technical field of water electrolysis, in particular to a method for preparing a bifunctional electrolytic water catalyst coating. Background technique [0002] Hydrogen is an ideal high-efficiency and clean energy storage medium. The conversion of renewable energy such as wind, light, and water into hydrogen has become a frontier direction for the development and application of renewable energy. How to improve the energy conversion efficiency and reduce the high cost of hydrogen production by electrolysis of water, a lot of research work is devoted to the development of new catalyst materials for hydrogen evolution and oxygen evolution. Noble metals such as Pt, Ru, Ir and their oxides have excellent catalytic properties for hydrogen evolution or oxygen evolution, but their wide application is limited by high price and scarcity of resources. It is of great scientific significance and practical value to develop cheap and ef...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B11/052C25B1/04C25D5/00C25D9/08C25D9/10
CPCC25B11/091C25B11/052C25B1/04C25D5/617C25D9/08C25D9/10Y02E60/36Y02P20/133
Inventor 何建波赵梦杰李芳李冰
Owner HEFEI UNIV OF TECH
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