Journal of Spectroscopy / 2018 / Article / Tab 1 / Research Article
Use of Electrochemical Impedance Spectroscopy for the Evaluation of Performance of PEM Fuel Cells Based on Carbon Cloth Gas Diffusion Electrodes Table 1 The fitting parameters for the impedance spectra at different current densities (i.e., from OCV to 0.9 A/cm2 ) and high inlet gas flow rate (H2 /air: 0.5/2 Nl/min).
Current density Sample OCV 0.1 (A/cm2 ) 0.3 (A/cm2 ) 0.5 (A/cm2 ) 0.7 (A/cm2 ) 0.9 (A/cm2 ) Ohmic resistance R s (Ω·cm2 )Reference 0.317 0.315 0.313 0.311 0.311 0.311 GDE1 cathode 0.291 0.291 0.286 0.285 0.285 0.286 GDE1 anode 0.275 0.268 0.268 0.268 0.268 0.268 GDE2 cathode 0.305 0.300 0.298 0.294 0.292 0.292 GDE2 anode 0.321 0.321 0.321 0.322 0.326 0.339 Charge transfer circuit R p (Ω·cm2 )Reference 6.350 0.596 0.276 0.199 0.176 0.174 GDE1 cathode 5.598 0.727 0.236 0.208 0.241 0.109 GDE1 anode 6.685 0.612 0.278 0.217 0.211 0.232 GDE2 cathode 6.260 0.700 0.408 0.372 0.421 0.303 GDE2 anode 6.369 0.596 0.280 0.209 0.222 0.276 CPEp -Q (F/cm2 ) Reference 0.047 0.035 0.038 0.041 0.047 0.048 GDE1 cathode 0.059 0.044 0.054 0.065 0.097 0.129 GDE1 anode 0.042 0.031 0.033 0.035 0.039 0.041 GDE2 cathode 0.021 0.014 0.019 0.020 0.027 0.032 GDE2 anode 0.043 0.032 0.034 0.034 0.047 0.067 CPEp -n Reference 0.800 0.850 0.850 0.850 0.850 0.850 GDE1 cathode 0.800 0.860 0.880 0.870 0.830 0.850 GDE1 anode 0.800 0.850 0.850 0.850 0.850 0.850 GDE2 cathode 0.800 0.880 0.860 0.880 0.860 0.880 GDE2 anode 0.800 0.850 0.850 0.850 0.800 0.750 C p (F/cm2 )Reference 0.035 0.018 0.017 0.0175 0.019 0.021 GDE1 cathode 0.045 0.025 0.029 0.034 0.045 0.061 GDE1 anode 0.031 0.015 0.014 0.015 0.016 0.018 GDE2 cathode 0.013 0.007 0.008 0.010 0.013 0.017 GDE2 anode 0.031 0.016 0.015 0.015 0.015 0.018 f p (Hz)Reference 0.725 15.051 33.933 45.620 47.463 43.710 GDE1 cathode 0.625 8.712 25.500 22.299 14.717 24.168 GDE1 anode 0.768 17.110 40.159 48.738 46.540 38.558 GDE2 cathode 1.959 30.661 45.629 41.178 29.298 30.677 GDE2 anode 0.794 17.003 37.457 52.700 47.867 32.829 Mass transfer circuit R d (Ω·cm2 )Reference — — — 0.027 0.047 0.089 GDE1 cathode — — 0.233 0.274 0.394 0.755 GDE1 anode — — 0.012 0.028 0.064 0.137 GDE2 cathode — — — 0.075 0.228 0.782 GDE2 anode — — — 0.036 0.059 0.100 CPEd -Q (F/cm2 ) Reference — — — 1.516 0.579 0.281 GDE1 cathode — — 0.068 0.065 0.063 0.051 GDE1 anode — — 1.959 0.985 0.390 0.184 GDE2 cathode — — — 0.341 0.095 0.036 GDE2 anode — — — 0.741 0.447 0.262 CPEd -n Reference — — — 0.900 1.000 1.000 GDE1 cathode — — 1.000 1.000 1.000 0.950 GDE1 anode — — 1.000 1.000 1.000 1.000 GDE2 cathode — — — 0.850 0.940 0.910 GDE2 anode — — — 1.000 1.000 1.000 C d (F/cm2 )Reference — — — 1.065 0.579 0.281 GDE1 cathode — — 0.068 0.065 0.063 0.043 GDE1 anode — — 1.959 0.985 0.390 0.184 GDE2 cathode — — — 0.179 0.074 0.025 GDE2 anode — — — 0.741 0.447 0.262 f d (Hz)Reference — — — 5.435 5.851 6.331 GDE1 cathode — — 10.082 8.924 6.361 4.867 GDE1 anode — — 6.962 5.774 6.390 6.282 GDE2 cathode — — — 11.876 9.452 8.045 GDE2 anode — — — 6.014 6.069 6.096
