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Membrane Electrode Assembly with Ultra Low Platinum Loading for Cathode Electrode of PEM Fuel Cell by Using Sputter Deposition
Author(s) -
Çögenli M. S.,
Mukerjee S.,
Yurtcan A. Bayrakçeken
Publication year - 2015
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201400062
Subject(s) - proton exchange membrane fuel cell , analytical chemistry (journal) , electrode , materials science , sputtering , membrane electrode assembly , platinum , cathode , ohmic contact , cyclic voltammetry , power density , gravimetric analysis , polarization (electrochemistry) , electrochemistry , sputter deposition , chemistry , membrane , composite material , thin film , layer (electronics) , anode , nanotechnology , catalysis , chromatography , power (physics) , quantum mechanics , physics , organic chemistry , biochemistry
Cathode electrodes of proton exchange membrane fuel cells were fabricated by using Pt sputter deposition to increase the gravimetric power density (W mg Pt −1 ) with reduced Pt loading. Ultra low Pt‐based electrodes having Pt loading in between 0.0011 and 0.06 mg Pt cm −2 were prepared by a radio frequency (RF) sputter deposition method on the surface of a non‐catalyzed gas diffusion layer (GDL) substrate by changing the sputtering time (20, 90, 180, 1050 s). The effect of cathode Pt loading on the performance of membrane electrode assembly were investigated using polarization curve, impedance, H 2 crossover and cyclic voltammetry techniques. The effect of backpressure on PEMFC performance was also investigated. Sputter1050 (0.06 mg Pt cm −2 ) exhibited the best power density at 80 °C cell temperature and without backpressure for H 2 /O 2 , 100 %RH (297 mW cm −2 and 5 W mg Pt −1 at 0.6 V). On the other hand sputter90 (0.005 mg Pt cm −2 ) showed the peak gravimetric power density (15 W mg Pt −1 and 75 mW cm −2 at 0.6 V). The Pt utilization efficiency increased as the Pt loading decreased. Sputter20 and sputter90 electrodes yielded insufficient electrochemical surface area (ECSA), higher charge transfer and ohmic resistance, but sputter180 and sputter1050 yielded sufficient ECSA and lower charge transfer and ohmic resistance.