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Ni-S-W-C hydrogen evolution electrode and preparation method thereof

A hydrogen evolution electrode and anode technology, applied in the field of electrocatalytic hydrogen evolution, can solve the problems of limited storage capacity, difficulty in large-scale industrial application, high energy consumption, etc., and achieve high hydrogen evolution catalytic activity, excellent stability, and low hydrogen evolution overpotential effects

Active Publication Date: 2017-05-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method consumes a lot of energy, and the hydrogen evolution overpotential of the cathode material is the main factor affecting energy consumption.
Although precious metals such as Pt and Pd have low hydrogen evolution overpotential, their reserves are limited and their prices are high, making them difficult to apply in large-scale industrial applications.

Method used

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  • Ni-S-W-C hydrogen evolution electrode and preparation method thereof
  • Ni-S-W-C hydrogen evolution electrode and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a method for preparing the Ni-S-W-C hydrogen evolution electrode described in the above technical solution, comprising the following steps:

[0029] (1) An electroplating aqueous solution is provided, and the electroplating aqueous solution includes components of the following concentrations: nickel source 80-160g / L, thiourea 80-130g / L, tungsten source 10-45g / L, lysine 1-5g / L , Complexing agent 60~100g / L, H 3 BO 3 20-60g / L, conductive agent 20-60g / L, saccharin 0.5-5.0g / L, sulfosalicylic acid 5-30g / L;

[0030] (2) Using the nickel substrate as the cathode and the anode, the distance between the cathode and the anode being 0.5 to 3.0 cm, performing electroplating with the electroplating aqueous solution obtained in the step (1) to obtain a Ni-S-W-C hydrogen evolution electrode.

[0031] The invention provides an electroplating aqueous solution. The electroplating aqueous solution includes components with the following concentrations:...

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 / LNa 2 SiO 3 Then rinse it with deionized water, boil and etch it in 20% hydrochloric acid for 5 minutes, then rinse it with deionized water, dry it naturally, and immerse it in absolute ethanol solution for later use;

[0055] (2) Preparation of Ni-S-W-C hydrogen evolution electrode by pulse 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-W-C plating solution: 140g / L NiSO 4 ·6H 2 O, 100g / L thiourea, 15g / L Na 2 WO 4 2H 2 O, 1g / L Lysine, 70g / LNa 3 C 6 h 5 o 7 2H 2 O, ...

Embodiment 2

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

[0061] (2) Preparation of Ni-S-W-C hydrogen evolution electrode by pulse 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-W-C plating solution: 120g / L NiSO 4 ·6H 2 O, 80g / L thiourea, 10g / L Na 2 WO 4 2H 2 O, 3g / L Lysine, 80g / L Na 3 C 6 h 5 o 7 2H 2 O, 40g / L H 3 BO 3 , 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 pulse peak current density is 1A / dm 2 , the duty cycle is 0.85, the pulse frequency is 100Hz, and the electrodeposition time is 70min. Rinse with deionized water after electroplating to remove residual plating solution, and dry naturally to prepare Ni-S-W-C hydrogen evolution electrode.

[0063] Step (3) is the same as step (3) in Example 1, and the hydrogen evolution li...

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Abstract

The invention provides a Ni-S-W-C hydrogen evolution electrode comprising a nickel base body and a Ni-S-W-C coating layer deposited on the surface of the nickel base body. The Ni-S-W-C coating layer comprises, by weight, 50%-80% of Ni, 5%-20% of S, 0.1%-1.5% of W and the balance C. The W and C elements are added to a Ni-S coating layer to form the Ni-S-W-C coating layer. The Ni-S-W-C coating layer has low hydrogen evolution over potentiality, high hydrogen evolution catalytic activity and excellent stability and can be widely used as an alkaline water electrolysis hydrogen evolution electrode material. According to the embodiment, the Ni-S-W-C hydrogen evolution electrode provided by the invention has the hydrogen evolution over potentiality being 270mV, the apparent current density being 5.27x10<2> mA / cm<2>, and has higher hydrogen evolution catalytic activity.

Description

technical field [0001] The invention relates to the technical field of electrocatalytic hydrogen evolution, in particular to a Ni-S-W-C hydrogen evolution electrode and a preparation method thereof. Background technique [0002] Hydrogen energy is considered as an excellent energy carrier because of its advantages such as abundant reserves, wide sources, high energy density, and cleanliness, and has attracted widespread attention from all over the world. Large-scale and low-cost production of hydrogen is a prerequisite for utilizing hydrogen energy. Among the many hydrogen production technologies, water electrolysis hydrogen production has the advantages of simple operation, high hydrogen purity, high energy efficiency (≥70%), and wide range of raw material sources. It is currently a mature industrial hydrogen production method. 4% of the total hydrogen production. However, this method consumes a lot of energy, and the hydrogen evolution overpotential of the cathode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/04C22C19/03
CPCC22C19/03C25B1/04C25B11/091Y02E60/36
Inventor 何捍卫吴艺辉
Owner CENT SOUTH UNIV
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