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Related Concept Videos

Batteries and Fuel Cells03:12

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization
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Supercapacitive microbial fuel cell: Characterization and analysis for improved charge storage/delivery performance.

Jeremiah Houghton1, Carlo Santoro1, Francesca Soavi2

  • 1Department of Chemical & Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, NM 87131, USA.

Bioresource Technology
|July 12, 2016
PubMed
Summary

Investigating supercapacitive microbial fuel cells (MFCs) revealed cathode size is key. Optimizing cathode dimensions significantly boosts power output and reduces internal resistance in these bio-electrochemical systems.

Keywords:
Electrode areaLinear modelMicrobial fuel cell (MFC)Power performanceSupercapacitor (SC)

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Area of Science:

  • Bio-electrochemical systems
  • Renewable energy technologies
  • Energy storage systems

Background:

  • Supercapacitive microbial fuel cells (SMFCs) integrate microbial fuel cell (MFC) technology with supercapacitor energy storage.
  • Understanding component scaling is crucial for optimizing SMFC performance and power delivery.
  • Previous research has not fully elucidated the impact of specific component dimensions on SMFC capacitance and power quality.

Purpose of the Study:

  • To investigate the influence of anode and cathode dimensions on the capacitance and power quality of supercapacitive microbial fuel cells.
  • To identify the limiting component in SMFCs concerning power output and internal resistance.
  • To develop a predictive model for SMFC performance based on geometric parameters.

Main Methods:

  • Fabrication and testing of SMFCs with varied anode and cathode dimensions.
  • Measurement of cell capacitance and delivered power quality under different configurations.
  • Analysis of internal resistance and peak power output during pulse discharge.
  • Development of a mathematical model to predict performance of a cylindrical SMFC design.

Main Results:

  • Cathode size was identified as the primary limiting factor for SMFC performance, more so than anode size.
  • Doubling the cathode area resulted in a ~120% increase in peak power output for a 10ms pulse discharge.
  • Internal resistance decreased by approximately 47% with the increase in cathode area.
  • A predictive model indicated a small-scale (21cm(3)) SMFC could achieve ~25mW peak power (~1300Wm(-3)).

Conclusions:

  • Optimizing cathode dimensions is critical for enhancing power delivery in supercapacitive microbial fuel cells.
  • SMFC design can be tailored using geometric scaling principles to achieve significant power output improvements.
  • The findings provide a basis for designing more efficient and powerful small-scale bio-electrochemical energy systems.