Aqueous alternating electrolysis prolongs electrode lifespans under harsh operation conditions

Area of Science:

• Electrochemistry
• Materials Science
• Surface Chemistry

Background:

• Electrolysis often faces challenges with electrode degradation under harsh conditions like high current densities and acidic environments.
• Prolonging electrode lifespan is crucial for efficient and cost-effective electrochemical processes.

Purpose of the Study:

• To develop an effective strategy for extending electrode lifespans during electrolysis under demanding conditions.
• To investigate the role of specific ion combinations in enhancing electrode durability.

Main Methods:

• Implementation of an alternating electrolysis approach for prompt repair and maintenance.
• Utilizing co-action of Fe group elemental ions and alkali metal cations, specifically a Co²⁺-Na⁺ combination.
• Testing electrode performance under high current densities in acidic solutions.

Main Results:

• A commercial Ni foam electrode sustained ampere-level current densities for 93.8 hours using alternating electrolysis.
• This represents a significant improvement over conventional electrolysis, where similar electrodes dissolved in ~2 hours.
• Demonstrated the potential for prolonged electrolysis through repeated deposition-dissolution processes.

Conclusions:

• Alternating electrolysis, particularly with a Co²⁺-Na⁺ system, offers a robust method for enhancing electrode longevity.
• This approach opens possibilities for advanced electrodeposition techniques and sustained electrochemical operations.
• The electrode lifespan improvement shows potential for further optimization with adjustable experimental variables.