A kind of bifunctional electrode and its preparation and application

A dual-function, electrode technology, applied in battery electrodes, circuits, fuel cell-type half-cells and primary-cell-type half-cells, etc., can solve the problems of low electrode reaction efficiency, insufficient reduction, etc. Longevity, increased hydrophilicity, low precious metal loading effect

Active Publication Date: 2020-08-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The cathode of the magnesium water battery is different from the cathode of the magnesium dissolved oxygen battery, and there are few related literature reports. Generally, nickel foam is used as the cathode of the battery. If it is used as an oxygen reduction electrode at the same time, the reaction efficiency of the electrode to oxygen is low. , Insufficient restoration and other defects

Method used

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  • A kind of bifunctional electrode and its preparation and application
  • A kind of bifunctional electrode and its preparation and application
  • A kind of bifunctional electrode and its preparation and application

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Embodiment

[0025] A bifunctional magnesium seawater battery, comprising a hydrogen evolution and oxygen reduction bifunctional catalyst cathode, a magnesium alloy anode, and a battery case, see figure 2 schematic diagram. The cathode is based on nickel foam, the specification is 90PPI, and the surface density is 250g / m 2 , thickness 1.7mm, electroplating solution for electrodeposition reaction is 0.1mol / L nickel chloride and 2mol / L ammonium chloride, pH value is 3; electrodeposition current density is 100mA / cm 2 , electrodeposition capacity 60C / cm 2 , the electrodeposited metal is nickel, and the diameter of hemispherical particles in the coating of the obtained bifunctional electrode substrate is about 1um; the thickness of the oxidized hydroxide layer is about 10nm, and the catalyst Pt is loaded on the surface of the hemispherical coating with a loading capacity of 25ug / cm 2 , the particle diameter of noble metal Pt is 19nm. Such as figure 1 As shown in Figure a, it is a 1000-fold...

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Abstract

The present invention provides a bifunctional electrode, a preparation method and applications thereof. The bifunctional electrode comprises a current collector and a hydrogen evolution-oxygen reduction bifunctional catalyst, wherein the catalyst is made of one selected from noble metals such as palladium and platinum, and uniformly grows on a hemispherical metal layer, the metal layer grows on anelectric-conduction foam metal through electroplating, the surface of the metal layer is oxidized into a metal-electroplated hydroxide, two cathodes are opposite to an anode in a battery monomer to form a sandwich-like configuration, and the cathodes and the anode are fixed by a battery shell. According to the present invention, the advantages of magnesium-water batteries and magnesium-dissolvedoxygen batteries are effectively combined, wherein the discharging is performed by using the working principle of the magnesium-dissolved oxygen battery during the low-current discharging so as to achieve the high discharging voltage and the high specific energy, and the discharging is performed by using the working principle of the magnesium-seawater battery under the condition of high current orinsufficient dissolved oxygen so as to ensure the normal working of the battery and effectively improve the stability of the battery.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a bifunctional electrode which can simultaneously serve as an oxygen reduction reaction electrode and a hydrogen evolution reaction electrode. Background technique [0002] Power supply is one of the foundations of modern marine research equipment, but limited by the actual working conditions under the sea, especially deep-sea conditions, conventional primary batteries and secondary batteries (such as lithium-ion batteries, silver-zinc batteries, lead-acid batteries, alkali It is difficult to meet the requirements of new underwater equipment for safety, reliability, long life and high capacity. [0003] The magnesium-dissolved oxygen battery is a typical magnesium seawater battery. The battery includes a magnesium alloy anode, an oxygen reduction reaction catalyst cathode, seawater as an electrolyte, and dissolved oxygen in seawater as a cathode reactan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/06H01M4/86H01M4/88
CPCH01M4/8631H01M4/8657H01M4/8825H01M4/8853H01M12/06H01M2004/8694
Inventor 王二东刘乾锋孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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