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Carbon-free Ag-Cu catalyst layer-based air electrode and its making method

A technology of air electrodes and catalyst layers, which can be applied to battery electrodes, circuits, electrical components, etc., and can solve problems such as corrosion and electrocatalytic activity

Active Publication Date: 2015-03-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problems of carbon corrosion and low electrocatalytic activity in the prior art, the present invention proposes an air electrode based on a carbon-free Ag-Cu catalyst layer and its preparation method

Method used

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  • Carbon-free Ag-Cu catalyst layer-based air electrode and its making method
  • Carbon-free Ag-Cu catalyst layer-based air electrode and its making method

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Embodiment 1

[0028] This embodiment is an air electrode based on a carbon-free Ag-Cu catalyst layer. The air electrode based on the carbon-free Ag-Cu catalyst layer is characterized in that: a layer of Ag-Cu alloy is deposited on the nickel foam, and the microscopic morphology of the Ag-Cu alloy is dendritic. The dendrites are evenly distributed on the nickel foam substrate, and the growth form is complete. The length of the primary dendrites is about 10-20 μm, and the length of the secondary dendrites is 2-8 μm. The growth direction of the secondary dendrites is 90 degrees to the primary crystal. Ag, Cu and Cu exist in Ag-Cu dendrites 2 O phase, the constituent elements are Ag and Cu in zero valence state, and there is a copper oxide layer on the surface. Primary Zn-air battery with Ag-Cu catalyst air electrode at 100mA / cm 2 Under the discharge power is 85.8mWcm –2 , the charge-discharge reciprocating efficiency of the secondary zinc-air battery is greater than 51.8%.

[0029] The pre...

Embodiment 2

[0039] This embodiment is an air electrode based on a carbon-free Ag-Cu catalyst layer. The air electrode based on the carbon-free Ag-Cu catalyst layer is characterized in that: a layer of Ag-Cu alloy is deposited on the nickel foam, and the microscopic morphology of the Ag-Cu alloy is dendrite and spherical particles. The dendrites are evenly distributed on the nickel foam matrix, and the growth form is complete. The length of the primary dendrites is about 15-23 μm. The spherical particles are randomly distributed on the primary dendrite matrix, and the diameter of the spherical particles is 0.1-1 μm. Ag, Cu and Cu exist in Ag-Cu alloy 2 O phase, the constituent elements are Ag and Cu in zero valence state, and there is a copper oxide layer on the surface. Primary Zn-air battery with Ag-Cu catalyst air electrode at 100mA / cm 2 Under the discharge power is 84.1mWcm –2 , the charge-discharge reciprocating efficiency of the secondary zinc-air battery is greater than 51.8%.

...

Embodiment 3

[0050] This embodiment is an air electrode based on a carbon-free Ag-Cu catalyst layer. The air electrode based on the carbon-free Ag-Cu catalyst layer is characterized in that: a layer of Ag-Cu alloy is deposited on the nickel foam, and the microscopic morphology of the Ag-Cu alloy is dendrite and flake. The dendrites are randomly distributed on the nickel foam matrix, and the length of the primary dendrites is about 10-15 μm. The lamellar substances are randomly distributed around the primary dendrites, with different sizes and a thickness of 0.5-3 μm. Ag, Cu and Cu exist in Ag-Cu alloy 2 O phase, the constituent elements are Ag and Cu in zero valence state, and there is a copper oxide layer on the surface. Primary Zn-air battery with Ag-Cu catalyst air electrode at 100mA / cm 2 Under the discharge power is 83.2mWcm –2 , the charge-discharge reciprocating efficiency of the secondary zinc-air battery is greater than 51.8%.

[0051] The preparation process of this embodiment...

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Abstract

The invention relates to a carbon-free Ag-Cu catalyst layer-based air electrode and its making method. The carbon-free Ag-Cu catalyst layer-based air electrode is obtained by depositing Ag-Cu alloy on foamed nickel; the microstructure of the Ag-Cu alloy is dendrite or spherocrystal or lamella crystal; and a Ag, Cu and Cu2O phase exists in the Ag-Cu alloy and is composed of Ag in zero valence state and Cu, and a copper oxide layer is arranged on the surface of the Ag-Cu alloy. The discharge power of the primary zinc air battery of the Ag-Cu catalyst air electrode under 100mA / cm<2> is 79.9-85.8mW.cm<-2>, and the charge and discharge reciprocating efficiency of the secondary zinc air battery of the Ag-Cu catalyst air electrode is greater than 51.8%. The catalyst layer has a very good oxygen reduction electrocatalysis property and overcomes the disadvantages of carbon corrosion and low electrocatalytic activity in the prior art.

Description

technical field [0001] The invention belongs to the field of alkaline metal-air battery and fuel battery, and in particular relates to a catalyst layer on the air electrode in these batteries and a preparation method thereof. Background technique [0002] A typical metal-air battery, such as a zinc-air fuel cell, generally contains an alkaline electrolyte that can replace the zinc-supplied anode and air electrode. Zinc-air fuel cells require frequent replacement of the alkaline electrolyte and zinc feedstock to eliminate oxidation. Reaction products such as zinc and zincate. [0003] A common air electrode is generally composed of a catalytic layer, a foamed nickel or nickel mesh collector and a microporous Teflon waterproof and breathable layer. The catalytic layer is generally composed of acetylene black and catalyst mixed in ethanol. After adding Teflon, it is dispersed and pumped. Filter to make a catalytic layer paste and roll it to a certain thickness. Paste the catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88
CPCH01M4/86H01M4/8817H01M4/8825H01M4/9016H01M4/9041H01M4/9075Y02E60/50
Inventor 陈福义靳亚超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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