Microbial Fuel Cell stack performance enhancement through carbon veil anode modification with activated carbon powder

Area of Science:

• Electrochemistry
• Renewable Energy
• Environmental Science

Background:

• Microbial Fuel Cells (MFCs) offer a promising avenue for converting chemical energy in waste streams like urine into electricity.
• Achieving practical power outputs and long-term stability remains a key challenge for MFC technology.
• Decentralized power generation is crucial for remote locations lacking traditional energy infrastructure.

Purpose of the Study:

• To develop and evaluate a novel anode material for ceramic MFC stacks to enhance electrochemical performance.
• To investigate the long-term operational stability and power output of MFCs utilizing the modified anode.
• To assess the potential of the developed MFC technology for practical applications and off-grid energy solutions.

Main Methods:

• Fabrication of a novel anode electrode by applying powdered activated carbon (PAC) onto a carbon fiber scaffold.
• Assembly of ceramic MFC stacks using both modified (MF-CV) and control (CV) anodes.
• Long-term operational testing of MFC stacks over 500 days to monitor power production and electrochemical activity.
• Comparative analysis of power density and treatment rates between MFCs with modified and control anodes.

Main Results:

• The MFC stack with modified anodes (MF-CV) demonstrated a 77% increase in power production, reaching 37.9 mW (21.1 W m⁻³), compared to the control (CV) at 21.4 mW (11.9 W m⁻³).
• The novel anode structure, combining PAC with a carbon fiber scaffold, enhanced electrocatalytic activity and surface area, leading to superior performance.
• The modified MFCs exhibited excellent long-term electrochemical stability over 500 days of operation.
• Improved waste treatment rates were observed in conjunction with enhanced power generation.

Conclusions:

• The developed PAC-modified carbon fiber anode significantly improves the power output and efficiency of ceramic MFC stacks.
• This cost-effective and simple anode modification offers a promising solution for high-performance MFCs.
• The technology holds potential for practical implementation as a sustainable, decentralized off-grid energy source, particularly for urine treatment.