Cathode, membrane electrode comprising the same, and preparation method thereof

A cathode and anode technology, applied in battery electrodes, alkaline battery electrodes, circuits, etc., can solve the problems of easy agglomeration of polymer electrolytes, unstable catalysts, and small catalyst contact area, and achieve improved contact area, catalytic activity and stability. High performance and low cost

Active Publication Date: 2010-07-21
ENN SCI & TECH DEV
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Problems solved by technology

[0006] However, the surface morphology of the coating given in the article shows that the nickel-molybdenum cathode catalyst is electrodeposited on the nickel grid, and it can be clearly seen that the nickel-molybdenum coating has obvious cracks, and the author also describes the situation that the catalyst is not stable
At the same t

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  • Cathode, membrane electrode comprising the same, and preparation method thereof

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Example Embodiment

[0039] Example 1

[0040] Prepare electrodeposition precursor aqueous solution 100mL, which contains nickel sulfate 0.1M, sodium molybdate 0.02M, cobalt sulfate 0.1M, sodium citrate 0.2M, 2M KOH solution to adjust the pH to 10.00, traditional three-electrode system, carbon paper as work Electrode, saturated calomel electrode as reference electrode, platinum sheet as auxiliary electrode, constant current 20mA / cm at 25℃ 2 Electrodeposition for 1 hour, take it out to dry, and obtain an electrodeposited catalytic layer (ie, the first catalytic layer) containing nickel, molybdenum and cobalt.

[0041] Under ultrasonic and mechanical stirring, slowly dropwise add sodium borohydride solution (1.25g sodium borohydride dissolved in 50mL distilled water) to 100mL of the precursor aqueous solution with the same composition as the electrodeposition precursor aqueous solution, resulting in a large number of bubbles and black suspended particles. After the bubbles are generated, the solution is ...

Example Embodiment

[0050] Example 2

[0051] Prepare electrodeposition precursor aqueous solution 100mL, which contains nickel sulfate 0.1M, sodium molybdate 0.05M, cobalt sulfate 0.1M, sodium citrate 0.2M, ferrous sulfate 0.02M, 2M KOH solution to adjust the pH to 10.50, traditional three electrodes System, 200 mesh stainless steel mesh as working electrode, saturated calomel electrode as reference electrode, platinum sheet as auxiliary electrode, constant current 35mA / cm at 30℃ 2 Electrodeposition for 2 hours, take it out and dry it to obtain an electrodeposited catalytic layer (ie, the first catalytic layer) containing nickel, molybdenum and cobalt.

[0052] Under ultrasonic and mechanical stirring, slowly dropwise add sodium dihydrogen hypophosphite solution (5g sodium dihydrogen hypophosphite dissolved in 50mL distilled water) to 100mL of the precursor aqueous solution with the same composition as the electrodeposition precursor aqueous solution, resulting in a large number of bubbles, resulting ...

Example Embodiment

[0055] Example 3

[0056] Prepare electrodeposition precursor aqueous solution 100mL, which contains 0.2M nickel nitrate, 0.2M cobalt chloride, 0.05M ferric nitrate, 0.4M potassium sodium tartrate, concentrated ammonia solution to adjust the pH to 9.00, traditional three-electrode system, 200 mesh nickel mesh As the working electrode, the saturated calomel electrode was used as the reference electrode, and the platinum sheet was used as the auxiliary electrode. The electrode was deposited at a constant voltage of 1.4V at 25°C for 3 hours. That is, the first catalytic layer).

[0057] Under ultrasonic and mechanical stirring, slowly add sodium borohydride solution (1.25g sodium borohydride dissolved in 50mL distilled water) to 100mL of the precursor aqueous solution with the same composition as the electrodeposition precursor aqueous solution, resulting in a large number of bubbles and black suspended particles. After the bubbles are generated, the solution is filtered, the filter ...

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Abstract

The invention provides a cathode which has high catalytic activity and stability as well as low energy consumption, a membrane electrode comprising the cathode, and a preparation method of the cathode. The cathode comprises a conductive substrate layer and a first catalytic layer arranged on the conductive substrate layer, wherein the first catalytic layer is formed by first nickel-based alloy catalyst. The cathode is characterized by further comprising a second catalytic layer arranged on the first catalytic layer, wherein the second catalytic layer is formed by the mixture of second nickel-based alloy catalyst and alkaline polymer electrolyte. The membrane electrode made by the cathode can be used for a fuel cell and water electrolysis.

Description

Technical field [0001] The invention relates to a cathode and a preparation method thereof, and a membrane electrode including the cathode. Background technique [0002] Solid polymer water electrolysis technology has become the main development direction in the current water electrolysis field. Using alkaline solid polymer electrolyte, the electrolysis environment changes from strong acid to strong alkaline, which can broaden the choice of catalyst metal to a large extent, and free solid polymer water electrolysis and fuel cells from the use of precious metals. The alkaline solid polymer electrolyte can also be applied to fuel cells. At present, the most widely studied cathode catalyst for hydrogen evolution reaction at home and abroad is a nickel-based alloy catalyst. This type of catalyst has low overpotential for hydrogen evolution reaction and has good hydrogen evolution activity. Its preparation methods include chemical reduction, electrodeposition, mechanical alloying, an...

Claims

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Application Information

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IPC IPC(8): H01M4/32H01M4/94H01M4/29
CPCY02E60/124Y02E60/50Y02E60/10
Inventor 曹萌刘涛闫永臣王雁
Owner ENN SCI & TECH DEV
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