Ion conducting nanofiber fuel cell electrodes

Overview

Proton exchange membrane fuel cells (PEMFCs) boast high efficiency, high energy and power density, low-temperature operation, rapid start-up time, and incorporation of fuels from renewable sources with no point-of-use greenhouse gas emissions. Consequently, PEMFCs have attracted considerable interest as alternative power sources for large market applications, such as transportation (hydrogen fuel cells) and portable electronics (methanol fuel cells). However, high cost due to the required precious metal (Pt) electrodes has severely limited their mass commercialization. Drexel researchers have recently developed a new process to fabricate high surface area fuel cell electrode structures based on super ion conducting nanofibers. The process combines eletrospinning of super proton conductive polymer nanofibers with electrospraying of nanosized electrocatalyst particles (platinum on carbon = Pt/C). This process produces a high surface area electrode, where there is more available catalyst surface area for the oxygen reduction reaction to occur, which is the rate-limiting step in fuel cells. Therefore, a true significant reduction in Pt can be achieved in these new nanofiber electrodes. Furthermore, our modeling suggests that much higher power densities can be achieved at these ultra-low commercially attractive Pt loadings.

Applications

  • Alternative power sources for large market applications, such as transportation (hydrogen fuel cells) and portable electronics (methanol fuel cells).

Advantages

  • Greater Efficiency: Process allows fabrication of cells with more surface area for the oxygen reduction reaction to occur, increasing the rate of the reaction and the current of the cell.
  • Reduced Need for Costly Precious Metals: our process shows high fuel cell power density at Pt loadings that are 40 times lower than typical Pt loadings used in state-of-the-art fuel cells 

Intellectual Property and Development Status

United States Patent Pending- 13/966,556

References

Wang, X.; Richey, F.W.; Wujcik, K.; Ventura, R.; Mattson, K.; Elabd, Y.A. Effect of Polytetrafluoroethylene on Ultra-Low Platinum Loaded Electrospun/Electrosprayed Electrodes in Proton Exchange Membrane Fuel Cells. Electrochimica Acta 2014, 139, 217-224.

Our E/E process to fabricate super ion conductive nanofiber fuel cell electrodes (nanofiber-nanoparticle network);

 

scanning electron micrograph (SEM) of our super ion conducting nanofiber E/E fuel cell electrode;

 

fuel cell performance results with our E/E MEAs showing outstanding power density (1.24 W/cm2 vs. 1.42 W/cm2 in state-of-the-art fuel cells) at ultra-low Pt loadings (0.094 mg/cm2 vs. 0.570 mg/cm2 in state-of-the-art fuel cells).

Commercialization Opportunities

 

Contact Information

 

For Technical Information:

 

Yossef Elabd

Professor

Artie McFerrin Department of Chemical Engineering

3122 TAMU

College Station, TX 77845

Phone: 1-979-845-7506

Email: elabd@tamu.edu

 

For Intellectual Property and Licensing Information:

 

Paul Dougherty

Licensing Manager

Office of Technology Commercialization

The Left Bank

3180 Chestnut Street, Suite 104

Philadelphia, PA 19104

Phone: 1-215-571-4290

Email: pdougherty@drexel.edu

For Information, Contact:

Inventors:

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