Unlock Higher Efficiency with Nickel Foam in Electrolyzers!
Nickel foam, as a porous metallic material, is used in alkaline electrolyzers mainly due to its unique phySical and structural properties. The following are the key reasons:
- High specific surface area
Nickel foamhas a three-dimensional, interconnected porous structure with porosity ranging from 80% to 95%, which significantly increases the active surface area of the Electrode. This high specific surface area can provide more reaction sites and enhance charge transfer efficiency during electrolysis, thereby improving the kinetics of hydrogen (HER) or oxygen (OER) precipitation reactions.
- Excellent electrical conductivity
Nickel itself is a good conductor, and the metallic backbone structure of nickel foam ensures a low-resistance electron transport path. During electrolysis, the current is evenly distributed, reducing energy loss and making it particularly suitable for long runs at high current densities.
- Mechanical strength and stability
The rigid skeleton structure of nickel foam gives it good mechanical strength to withstand the physical impact of electrolyte flow and bubble generation. In a strong alkaline environment (e.g., 30% KOH solution), a dense oxide layer (NiO/Ni(OH)₂) will form on the nickel surface, which further resists corrosion and prolongs electrode life.
- Adjustable catalytic activity
Through surface modification (e.g., loading alloys such as NiFe, NiMo, or precious metals by electrodeposition, chemical plating, etc.), nickel foam can be transformed into an efficient catalyst. For example, the NiFe layer can significantly reduce the OER overpotential and improve the overall efficiency of electrolyzed water.
- Rapid release of bubbles
The porous structure facilitates the gas (H₂/O₂) generated during the electrolysis process to be quickly removed from the electrode surface, avoiding the accumulation of gas bubbles to block the active sites and maintaining efficient contact at the reaction interface.
- Cost and processability
Compared to precious metal electrodes such as platinum, nickel foam is inexpensive and easy to produce on a large scale. Its flexible structure can also be cut into different shapes to fit a variety of electrolyzer designs.
Examples of application scenarios:
1)Alkaline water electrolysis for hydrogen production: as cathode (hydrogen precipitation) and anode (oxygen precipitation) substrate material.
2)Fuel cells: as a gas diffusion layer or catalyst carrier.
3)Electrochemical synthesis: e.g., electrode materials in the chlor-alkali industry.
In conclusion, nickel foam has become an ideal electrode material in alkaline electrolysis tanks by combining high electrical conductivity, large specific surface area, and strong corrosion resistance, while its electrocatalytic performance can be further optimized by surface modification.
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Mrs. Jane Chen --- Sales Manager
Whatsapp: 86 15879245734
Email:sales20@chinabeihai.net
