Continuous flowing membraneless microbial fuel cells with separated electrode chambers

Area of Science:

• Energy and Environmental Science
• Electrochemistry
• Biotechnology

Background:

• Microbial fuel cells (MFCs) offer a promising sustainable energy technology.
• High costs associated with membranes and noble metal catalysts limit MFC applications.
• Developing cost-effective and efficient MFC designs is crucial for widespread adoption.

Purpose of the Study:

• To design and evaluate a novel membraneless microbial fuel cell (MFC) with separated electrode chambers.
• To assess the proton transfer efficiency and power generation capabilities of the proposed MFC.
• To determine the chemical oxygen demand (SCOD) removal efficiency of the membraneless MFC.

Main Methods:

• A membraneless MFC was designed with two separated electrode chambers connected by a channel.
• Continuous electrolyte flow from the anode to the cathode facilitated proton transfer.
• Performance was evaluated by measuring proton mass transfer coefficient, output voltage, peak power density, and SCOD removal efficiency.

Main Results:

• The membraneless MFC achieved a proton mass transfer coefficient of 0.9086 cm/s, surpassing membrane-based MFCs.
• A maximum output voltage of 160.7 mV and a peak power density of 24.33 mW/m³ were recorded.
• SCOD removal efficiency reached 90.45%, indicating effective wastewater treatment capabilities.

Conclusions:

• The designed membraneless MFC demonstrates feasibility and significant advantages over traditional designs.
• Continuous electrolyte flow effectively drives proton transfer, enhancing MFC performance.
• This MFC model presents a cost-effective and efficient solution for energy generation and wastewater treatment.