Ultra-low platinum loading high-performance PEMFCs using buckypaper-supported electrodes |
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Authors: | W Zhu JP Zheng R Liang B Wang C Zhang G Au EJ Plichta |
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Institution: | 1. Department of Electrical and Computer Engineering, Florida A&M University and Florida State University, Tallahassee, FL 32310, United States;2. Department of Industrial and Manufacturing Engineering, Florida A&M University and Florida State University, Tallahassee, FL 32310, United States;3. U.S. Army CERDEC, Fort Monmouth, NJ 07703, United States |
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Abstract: | The microstructure of the catalyst layer in proton exchange membrane fuel cells (PEMFCs) greatly influences catalyst (Pt) utilization and cell performance. We demonstrated a functionally graded catalyst layer based on a double-layered carbon nanotube/nanofiber film- (buckypaper) supported Pt composite catalyst to approach an idealized microstructure. The gradient distribution of Pt, electrolyte and porosity along the thickness effectively depresses the transport resistance of proton and gas. A rated power of 0.88 W/cm2 at 0.65 V was achieved at 80 °C with a low Pt loading of 0.11 mg/cm2 resulting in a relatively high Pt utilization of 0.18gPt/kW. The accelerated degradation test of catalyst support showed a good durability of buckypaper support because of the high graphitization degree of carbon nanofibers. |
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