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Buckypaper-based catalytic electrodes for improving platinum utilization and PEMFC's performance |
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| Authors: | W Zhu D Ku Z Liang B Wang C Zhang S Walsh EJ Plichta |
| Affiliation: | a Department of Electrical and Computer Engineering, Florida A&M University-Florida State University College of Engineering, Tallahassee, FL 32310, USA b Department of Industrial Engineering, Florida A&M University-Florida State University College of Engineering, Tallahassee, FL 32310, USA c Center for Advanced Power Systems (CAPS), Florida State University, Tallahassee, FL 32310, USA d High-Performance Materials Institute (HPMI), Florida State University, Tallahassee, FL 32310, USA e U.S. Army Research Laboratory (ARL), Aberdeen Proving Ground, MD 21005, USA f U.S. Army CERDEC, Fort Monmouth, NJ 07703, USA |
| Abstract: | Platinum (Pt) catalytic electrode was developed by using carbon nanotube films (buckypaper) as supporting medium and electrodeposition method to deposit Pt catalyst. Buckypapers are free-standing thin films consisting of single-walled carbon nanotubes (SWNTs), multi-walled carbon nanotubes (MWNTs) and/or carbon nanofibers (CNFs) held together by van der Waals forces without any chemical binders. Special mixed buckypapers was developed by layered microstructures with a dense and high-conducting SWNT networks at the surface, as well as large porous structures of CNF networks as back supports. This unique microstructure can lead to improve Pt catalyst accessibility and mass exchange properties. Pt particles of about 6 nm were uniformly deposited in porous buckypapers. A promising electrochemical surface area of ∼40 m2/g was obtained from these electrodes. A Pt utilization as low as 0.28 gPt/kW was achieved for the cathode electrode at 80 °C. Pt utilization efficiency can be further improved by optimization of the electrodeposition condition in order to reduce the Pt particle size. |
| Keywords: | PEMFC Carbon nanotube Buckypaper Electrocatalyst Pt utilization |
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