Breakthrough in Fuel Research: Passive Direct Liquid Fuel Cells Demonstrate Stable Current Output

Strategic Insights -

Researchers from the National Kaohsiung University of Science and Technology have made a significant breakthrough in fuel research, demonstrating the potential of passive direct liquid fuel cells (DLFCs) for portable electronics. Their study, published in the journal Fuel, focused on mitigating electrode flooding in DLFCs, a crucial step towards achieving stable current output. The research team, led by Jin-Cherng Shyu, fabricated passive direct formate fuel cells (DFFCs) with Nafion or PTFE-based cathodes on Ni foam or carbon paper, using palladium and platinum catalysts.

Key Takeaways:

  • The researchers found that the cathode structure significantly impacts the maximum power density (MPD) and current output stability of DLFCs.
  • The Nafion Ni Foam DFFC exhibited the highest MPD of 37.3 mW/cm^2 due to its lowest mass transport and charge transfer impedances.
  • DFFCs with a Nafion-based cathode had higher MPD than those with a PTFE-based cathode due to the high electrochemical surface area (ECSA).
  • The PTFE Ni Foam DFFC showed stable current output of 42 mA/cm^2 with minimal decay of 2.38% over a 10-h 0.4-V discharge.
  • The Nafion Ni Foam DFFC displayed a current density decay of 56.67% after the 10-h discharge with a final current density of 39 mA/cm^2.

Statistics:

  • The MPD of the Nafion Ni Foam DFFC was 37.3 mW/cm^2.
  • The MPD of the PTFE Ni Foam DFFC was 19.5 mW/cm^2.
  • The MPD of the DFFC with a PTFE-based cathode on carbon paper was 30.2 mW/cm^2.
  • The current density of the PTFE Ni Foam DFFC was 42 mA/cm^2.
  • The current density of the Nafion Ni Foam DFFC was 39 mA/cm^2 after a 10-h discharge.

Sources:

  • NewsRx LLC, "New Fuel Research Findings from National Kaohsiung University of Science and Technology Described," Energy Weekly News, October 24, 2025, p 390.
  • National Kaohsiung University of Science and Technology, "Performance and Durability of Passive Direct Formate Fuel Cells With Nafion-or PTFE-based Cathodes," Fuel, 2025; 398.
  • Elsevier Sci Ltd, "Fuel," www.journals.elsevier.com/fuel/.