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Composite coating for water electrolysis metal bipolar plate and preparation method thereof

A metal bipolar plate and composite coating technology, applied in the field of water electrolysis, can solve the problems of limiting the working efficiency of the electrolyzer and affecting the conductivity, etc., and achieve good passivation effect, prevent penetration, and improve durability

Pending Publication Date: 2022-03-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface passivation of titanium will seriously affect its conductivity, thereby limiting the efficiency of the electrolytic cell, so it is very important to modify the surface of titanium materials to improve their corrosion resistance and conductivity.

Method used

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  • Composite coating for water electrolysis metal bipolar plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] TA1 type pure titanium was selected as the metal bipolar plate substrate, and the surface dust and oil stains were removed by ultrasonic cleaning in deionized water and ethanol in sequence, and then hung in the vacuum chamber of a magnetron sputtering coating machine after natural drying.

[0032] The chamber is evacuated to below 3 x 10 -3 Pa, keep the pressure at 0.5Pa by passing argon gas, apply -600V bias voltage to the sample for sputter cleaning for 10min, and remove the surface oxide film.

[0033] The pressure of the chamber was kept constant, and 30nm of titanium was deposited on the surface of the substrate as a self-healing layer by magnetron sputtering titanium target, the titanium target current was 5A, and the deposition time was 5min.

[0034] 18sccm nitrogen and 3sccm oxygen were introduced as reaction gases, the chamber pressure was adjusted to 0.7Pa, and 100nm of titanium oxynitride was deposited as a dense corrosion-resistant layer, wherein the number...

Embodiment 2

[0038] TA1 type pure titanium was selected as the metal bipolar plate substrate, and the surface dust and oil stains were removed by ultrasonic cleaning in deionized water and ethanol in sequence, and then hung in the vacuum chamber of a magnetron sputtering coating machine after natural drying.

[0039] The chamber is evacuated to below 3 x 10 -3 Pa, keep the pressure at 0.5Pa by passing argon gas, apply -600V bias voltage to the sample for sputter cleaning for 10min, and remove the surface oxide film.

[0040] The pressure of the chamber was kept constant, and 30nm of titanium was deposited on the surface of the substrate as a self-healing layer by magnetron sputtering titanium target, the titanium target current was 5A, and the deposition time was 5min.

[0041] 18sccm nitrogen and 4sccm oxygen were introduced as reaction gases, the chamber pressure was adjusted to 0.7Pa, and 100nm titanium oxynitride was deposited as a dense corrosion-resistant layer, wherein the proportio...

Embodiment 3

[0045] TA1 type pure titanium was selected as the metal bipolar plate substrate, and the surface dust and oil stains were removed by ultrasonic cleaning in deionized water and ethanol in sequence, and then hung in the vacuum chamber of a magnetron sputtering coating machine after natural drying.

[0046] The chamber is evacuated to below 3 x 10-3 Pa, keep the pressure at 0.5Pa by passing argon gas, apply -600V bias voltage to the sample for sputter cleaning for 10min, and remove the surface oxide film.

[0047] The pressure of the chamber was kept constant, and 30nm of titanium was deposited on the surface of the substrate as a self-healing layer by magnetron sputtering titanium target, the titanium target current was 5A, and the deposition time was 5min.

[0048] 18sccm nitrogen and 3sccm oxygen were introduced as reaction gases, the chamber pressure was adjusted to 0.7Pa, and 100am of titanium oxynitride was deposited as a dense corrosion-resistant layer, in which the number ...

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Abstract

The invention relates to a composite coating for a water electrolysis metal bipolar plate and a preparation method. The composite coating comprises self-healing layers and corrosion-resistant layers which are sequentially and alternately arranged from the surface of the metal bipolar plate to the outer side, the self-healing layers and the corrosion-resistant layers are alternately arranged at least once, and the outermost layer is a conductive layer; the self-healing layer is an alloy of one or more than two of titanium, zirconium, niobium, chromium and tantalum, the compact corrosion-resistant layer is a transition metal nitrogen oxide layer, and the outermost conductive layer is a transition metal nitride layer. The composite coating disclosed by the invention can keep relatively high conductivity and relatively good structural integrity in a water electrolysis environment, the contact resistance and corrosion current of a metal plate base material are reduced, and the durability of a metal plate is improved.

Description

technical field [0001] The invention belongs to the field of water electrolysis, in particular to a composite coating used for water electrolysis metal bipolar plates. Background technique [0002] Proton exchange membrane water electrolysis is considered to be an ideal substitute for alkaline water electrolysis, and its higher current density and operating power, as well as the flexibility of dynamic operation, make them an intermittent energy source (such as wind energy, solar energy, and tidal energy, etc.) Ideal for energy storage systems. The membranes in the electrolyzer provide high proton conductivity, low gas permeability and allow a compact system design without circulation of liquid alkaline electrolyte, which makes proton exchange membrane electrolyzers safer and more reliable than alkaline electrolyzers. The bipolar plate is an important component in the proton exchange membrane electrolyzer. It is mainly used to separate the individual electrolyzers, conduct h...

Claims

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Application Information

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IPC IPC(8): C25B11/053C23C14/06C23C14/32C23C14/35C23C14/48C23C16/30C23C16/34C23C16/455C25B1/04C25B11/036
CPCC25B11/053C25B11/036C25B1/04C23C14/48C23C14/35C23C14/325C23C14/0676C23C14/0641C23C16/45525C23C16/34C23C16/308Y02E60/36
Inventor 邵志刚苟勇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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