Improved microbial fuel cell performance by encapsulating microbial cells with a nickel-coated sponge

Area of Science:

• Electrochemistry
• Materials Science
• Environmental Science

Background:

• Developing advanced anodic materials is crucial for enhancing microbial fuel cell (MFC) performance.
• Key factors include promoting microbial biofilm formation, efficient substrate transfer, and effective electron transfer.

Purpose of the Study:

• To investigate the potential of nickel-coated sponge as a novel, cost-effective anode material for MFCs.
• To evaluate its performance in terms of microbial encapsulation, electrochemical activity, and power generation.

Main Methods:

• A nickel-coated sponge with a 3D macro-porous structure was utilized as the anode.
• Microbial cells were encapsulated within the sponge material.
• Electrochemical activity and power output were measured and compared to traditional materials like carbon paper.

Main Results:

• The nickel-coated sponge provided a high surface area, facilitating microbial attachment and colonization.
• It supported efficient substrate and electron transfer through its conductive pathways.
• A maximum power density of 996 mW m⁻² was achieved, surpassing previous reports.
• Stable electricity generation and 90.3% chemical oxygen demand removal were observed.

Conclusions:

• Nickel-coated sponge is a highly promising anode material for MFC fabrication.
• Its unique structure enhances microbial immobilization and electrochemical performance.
• This material offers an efficient method for improving MFC efficiency and wastewater treatment.