An efficient ni-s-b hydrogen evolution electrode and its preparation method and application

A hydrogen evolution electrode, ni-s-b technology, applied in the field of electrocatalytic hydrogen evolution, can solve the problems of easy generation of impurities, low coating strength, high equipment requirements, etc., and achieve excellent stability, low hydrogen evolution overpotential, and high hydrogen evolution catalytic activity.

Active Publication Date: 2021-05-14
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composition of the material prepared by the thermal decomposition method is easy to control, the process is simple, and the cost is low. However, the strength of the coating is not high, and the types and concentrations of metal compounds that can be decomposed are limited.
Ion sputtering can obtain alloy electrodes with any ratio and various structures. However, these methods have high requirements on equipment and complicated processes, and are not suitable for large-scale industrial production.
The mechanical alloying method is simple in process, low in cost and large in output, but defects such as impurities, pollution, oxidation and stress are prone to occur during the grinding process

Method used

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  • An efficient ni-s-b hydrogen evolution electrode and its preparation method and application
  • An efficient ni-s-b hydrogen evolution electrode and its preparation method and application

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[0029] The present invention also provides a kind of preparation method of efficient Ni-S-B hydrogen evolution electrode, comprises the following steps:

[0030] (1) provide electroplating aqueous solution, described electroplating aqueous solution comprises the component of following concentration: nickel source 80~160g / L, thiourea 80~130g / L, boron source 10~45g / L, complexing agent 60~100g / L , conductive agent 20-60g / L, saccharin 0.5-5.0g / L, sulfosalicylic acid 5-30g / L;

[0031] (2) Using the nickel substrate as the cathode and the anode, the distance between the cathode and the anode being 0.5-3.0 cm, performing electroplating with the electroplating aqueous solution obtained in the step (1) to obtain a Ni-S-B hydrogen evolution electrode.

[0032] Preferably, during the electroplating process in the step (2), the temperature of the electroplating aqueous solution is 25-65° C., and the electroplating time is 40-100 min.

[0033] Preferably, the current density of electropla...

Embodiment 1

[0053] (1) Pretreatment of Ni matrix

[0054] First, the Ni sheet is mechanically polished to remove the oxide on the surface to make it metallic luster, and then cleaned with deionized water; then ultrasonically oscillated in lye and absolute ethanol for 20 minutes for chemical degreasing, wherein the lye is 15g / LNaOH, 60g / L Na 3 PO 4 12H 2 O, 25g / L Na 2 CO 3 and 15g / L Na 2 SiO 3 Then rinse with deionized water, boil and etch in 20% hydrochloric acid for 5 minutes, rinse with deionized water, dry naturally, and immerse in absolute ethanol solution for later use.

[0055] (2) Preparation of Ni-S-B hydrogen evolution electrode by electrodeposition

[0056] A double-anode and single-cathode system is adopted, and the Ni substrate treated in step (1) is used as the cathode and the anode. Composition of Ni-S-B plating solution: 140g / L NiSO 4 ·6H 2 O, 100g / L Thiourea, 40g / L Borax, 70g / L Na 3 C 6 h 5 o 7 2H 2 O, 20g / L NaCl, 1.5g / L saccharin, 5g / L sulfosalicylic acid,...

Embodiment 2

[0060] Step (1) is the same as step (1) in Example 1.

[0061] (2) Preparation of Ni-S-B hydrogen evolution electrode by electrodeposition

[0062] A dual-anode and single-cathode system is adopted, and the nickel sheet treated in step (1) is used as the cathode and the anode. Composition of Ni-S-B plating solution: 120g / L NiSO 4 ·6H 2 O, 80g / L thiourea, 30g / L borax, 80g / L Na 3 C 6 h 5 o 7 2H 2 O, 20g / L NaCl, 1.5g / L saccharin, 5g / L sulfosalicylic acid, the pH value of the plating solution is 3, the temperature of the plating solution is 50°C; the current density is 2A / dm 2 , The electrodeposition time is 70min. Rinse with deionized water after electroplating to remove residual plating solution, and dry naturally to prepare Ni-S-B hydrogen evolution electrode. The electrode composition was tested by an energy spectrometer, and the electrode composition was Ni: 70wt.%; S: 25wt.%; B: 5wt.%. The thickness of the electrodes was 20 μm. Step (3) is the same as step (3) in ...

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Abstract

The invention discloses a high-efficiency Ni-S-B hydrogen evolution electrode, comprising a nickel base and a Ni-S-B coating deposited on the surface of the nickel base, and the Ni-S-B coating includes the following weight percentages: Components: Ni: 40-85%, S: 5-50%, B: 0.1-10%. The invention also discloses its preparation method and application. The invention improves the hydrogen evolution catalytic activity of the hydrogen evolution electrode and reduces the hydrogen evolution overpotential of the hydrogen evolution electrode.

Description

technical field [0001] The invention relates to the technical field of electrocatalytic hydrogen evolution, in particular to a high-efficiency Ni-S-B hydrogen evolution electrode and its preparation method and application. Background technique [0002] Hydrogen energy is considered as an ideal energy carrier because of its abundant reserves, clean and efficient, and high energy density, and has attracted widespread attention from all over the world. Hydrogen production by electrolysis of water has the advantages of mature technology, simple process, no pollution, and high purity of hydrogen produced. It is currently an important method for large-scale and cheap hydrogen production. However, in the actual production process, due to the existence of hydrogen evolution overpotential, the energy consumption in the process of electrolyzing water is increased, which limits the development of the water electrolysis industry. Although precious metals such as Pt and Pd have low hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56C22C19/03C25B11/054C25B11/091
CPCC22C19/03C25D3/562C25B11/075
Inventor 廉冀琼张厚安欧阳明亮邓沁铃古思勇
Owner XIAMEN UNIV OF TECH
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