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A simple method for preparing a binder-free paper-based air cathode for microbial fuel cells.

Wei Yang1, Jun Li1, Qian Fu1

  • 1Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China.

Bioresource Technology
|June 4, 2017
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Summary

Researchers developed a low-cost, binder-free air-cathode for microbial fuel cells (MFCs) using carbonized kraft paper and iron (II) phthalocyanine (FePc). Optimized fabrication yielded superior oxygen reduction reaction (ORR) performance due to increased pyridinic-N content.

Keywords:
Air-cathodeIron (II) phthalocyanineKraft paperMicrobial fuel cellOxygen reduction reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Binder-free air-cathodes are crucial for microbial fuel cells (MFCs).
  • Kraft paper offers a sustainable and low-cost support material.
  • Iron (II) phthalocyanine (FePc) is a promising catalyst for oxygen reduction reactions (ORRs).

Purpose of the Study:

  • To develop a simple and cost-effective method for preparing binder-free air-cathodes.
  • To investigate the effect of fabrication parameters on the performance of FePc-based air-cathodes.
  • To evaluate the suitability of carbonized kraft paper as a support for FePc catalysts in MFCs.

Main Methods:

  • Kraft paper was carbonized at 1000°C.
  • Iron (II) phthalocyanine (FePc) was applied and heat-treated at 700°C.
  • Electrochemical tests, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Raman spectroscopy were employed for characterization.

Main Results:

  • The optimized cathode (KP-HT-FePc-HT) achieved a peak power density (Pmax) of 830±31mWm⁻².
  • This performance significantly surpassed that of a directly pyrolyzed cathode (FePc/KP-HT) which yielded 363±48mWm⁻².
  • Characterization revealed that higher pyridinic-N content in KP-HT-FePc-HT contributed to its superior electrocatalytic activity.

Conclusions:

  • The developed FePc/kraft paper-based binder-free air-cathode demonstrates excellent ORR performance.
  • The fabrication method is simple, cost-effective, environmentally friendly, and scalable.
  • This approach presents a viable alternative for air-cathodes in MFC applications.