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Microbial Fuel Cells01:23

Microbial Fuel Cells

Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...

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Digital Pregnancy Test Powered by an Air-Breathing Paper-Based Microfluidic Fuel Cell Stack Using Human Urine as

Irma Lucia Vera-Estrada1, Juan Manuel Olivares-Ramírez1, Juvenal Rodríguez-Reséndiz2

  • 1Departamento de Energías Renovables, Universidad Tecnológica de San Juan del Río, Av. La Palma No 125 Vista Hermosa, San Juan del Río 76800, Mexico.

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Summary

This study introduces a novel paper-based microfluidic fuel cell (μFC) powered by human urine. This innovation enables autonomous, self-powered pregnancy tests without external electrolytes.

Keywords:
human urinelateral flow assay testspaper-based microfluidic fuel cellpower supplypregnancy test

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Area of Science:

  • Electrochemistry
  • Biomedical Engineering
  • Materials Science

Background:

  • Paper-based microfluidic fuel cells (μFCs) offer potential for portable diagnostics.
  • Autonomous lateral flow assays require integrated, self-sufficient power sources.
  • Urine's electrochemical properties have not been fully exploited for powering diagnostic devices.

Purpose of the Study:

  • To develop and demonstrate a urine-powered, air-breathing paper-based μFC for pregnancy tests.
  • To establish a self-sufficient power supply for lateral flow assays using human urine.
  • To evaluate the performance of a μFC stack for powering diagnostic device displays.

Main Methods:

  • Fabrication of an air-breathing paper-based μFC using TiO2-Ni anode and Pt/C cathode.
  • Integration of the μFC with a standard pregnancy test.
  • Construction and testing of a μFC stack powered solely by human urine.
  • Performance characterization including voltage, current, and power density measurements.

Main Results:

  • A single μFC achieved maximum power densities of ~0.23 mW cm⁻² with ~0.96 V and 1.00 mA cm⁻².
  • A μFC stack demonstrated enhanced performance with maximum power densities of ~1.38 mW cm⁻² with ~1.89 V and 2.77 mA cm⁻².
  • The μFC stack successfully powered the display of a pregnancy test, enabling result visualization.

Conclusions:

  • Urine can serve as a fuel source for paper-based μFCs, eliminating the need for external electrolytes.
  • This technology enables the development of truly autonomous, low-cost, and portable diagnostic devices.
  • The developed μFCs hold promise for point-of-care diagnostics in resource-limited settings.