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Preparation method for selenide thin film modifying foamed nickel electrode and application thereof

A foamed nickel and selenide technology, applied in the field of environmental engineering, can solve the problems of reduced catalytic anode oxygen precipitation activity, limited number of active sites, difficult industrial production, etc., achieves excellent electrocatalytic activity, reduces bubble overpotential, and the preparation process mild effects

Active Publication Date: 2017-06-20
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the above-mentioned catalysts has the following problems: (1) organic solvents need to be used, and the process is cumbersome, time-consuming, and costly, and it is difficult to realize industrial production; When decomposing performance, it needs to be fixed on the conductive substrate with the help of polymer binders such as Nafion. Due to the additional addition of non-conductive substance Nafion, its catalytic anode oxygen evolution activity is reduced.
However, this method has the following problems: (1) The graphite disk substrate electrode is a two-dimensional flat electrode, and usually only the outermost layer is in contact with the electrolyte, which limits the number of active sites; (2) The situation of high current density or a large number of bubbles In this case, bubbles are easy to accumulate on the flat plate electrode, resulting in significant bubble overpotential, thereby increasing energy consumption; (3) The preparation process of the thin film catalyst needs to be calcined under a high-temperature inert atmosphere, which takes a long time, increases energy consumption, and is not easy to realize industrialization

Method used

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  • Preparation method for selenide thin film modifying foamed nickel electrode and application thereof
  • Preparation method for selenide thin film modifying foamed nickel electrode and application thereof
  • Preparation method for selenide thin film modifying foamed nickel electrode and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: the method for preparing cobalt selenide film by foam nickel electrode

[0041] (1) Sonicate the nickel foam electrode in hydrochloric acid solution and absolute ethanol solution with a concentration of 6M for 15-25min respectively; dry it after cleaning and set aside;

[0042] (2) the nickel foam electrode that step (1) is obtained is placed in electrodeposition solution, comprises following component in the described electrodeposition solution: the potassium chloride of the cobalt chloride hexahydrate of 10mM, the selenium dioxide of 10mM and 50mM . The molar concentration ratio of described cobalt chloride hexahydrate and selenium dioxide is 1:1; Platinum rod is made counter electrode, and saturated calomel electrode is reference electrode, carries out constant potential deposition 20min under the potential of-0.6V under room temperature, super Fully rinse with pure water, blow dry with nitrogen, and dry overnight in a vacuum oven at 50°C to obtain a c...

Embodiment 2

[0046] Embodiment 2: the method for preparing cobalt selenide thin film by foam nickel electrode

[0047] The difference from Example 1 is that the potentiostatic deposition was carried out at room temperature at a potential of -0.7 V (relative to a saturated calomel reference electrode) for 20 min.

Embodiment 3

[0048] Embodiment 3: adopt the method for preparing cobalt selenide thin film with nickel foam electrode

[0049] The difference from Example 1 is that the potentiostatic deposition was carried out at room temperature at a potential of -0.8 V (relative to a saturated calomel reference electrode) for 20 min.

[0050] Table 1 Example 1-3 prepared cobalt selenide film property comparison (without calcination)

[0051]

[0052] Note: same current density: current density 30mA / cm 2 ; The same overpotential: 386mV.

[0053] According to Table 1, when the deposition potential is -0.7V (relative to the saturated calomel reference electrode), the cobalt selenide film prepared by direct deposition at room temperature without heating and calcining has the best properties.

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Abstract

The invention relates to a preparation method for a selenide thin film modifying a foamed nickel electrode and an application thereof. The preparation method comprises the following steps that the foamed nickel electrode is subjected to surface treatment through hydrochloric acid and ethanol, a nickel oxide layer on the surface of the foamed nickel electrode is removed, and the clean and fresh metal surface is obtained; and after pretreating, the foamed nickel electrode is immersed into a mixed solution of a transition metal chloride, a sulfur group oxide and a supporting electrolyte, and the selenide thin film is deposited on the surface of the foamed nickel electrode through a electrochemical method. The selenide thin film obtained through the electrochemical deposition method is stable, catalytic precipitation of hydrolyzed oxygen can be realized; the foamed nickel electrode is of a multi-layer structure, the special three-dimensional porous structure, compared with another one-dimensional or two-dimensional substrate electrodes, has a richer surface area, the price is low, so that the industrial large-scale application is facilitated; and a thin film catalyst is promising in being used in the research field of water-electrolytic hydrogen making.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a preparation method of a selenide film, in particular to a preparation method and application of a selenide film modified foamed nickel electrode for catalyzing water decomposition and oxygen precipitation. Background technique [0002] With the development of the global economy, people's consumption of natural resources such as coal, oil and natural gas is increasing day by day. As a clean, safe and efficient sustainable new energy, hydrogen fuel has attracted more and more attention. The largest source of hydrogen fuel is water, from which the hydrogen energy extracted is 9,000 times that of the earth's fossil fuel heat. Since hydrogen production by electrolysis of water can store and convert renewable energy such as solar energy, wind energy and tidal energy with hydrogen as the medium; therefore, hydrogen production by electrolysis of water has gradually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/08
CPCC25D9/08
Inventor 黄明华徐秀娟陈宗坤王昕
Owner OCEAN UNIV OF CHINA
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