Journal of Spectroscopy / 2018 / Article / Tab 2 / Research Article
Use of Electrochemical Impedance Spectroscopy for the Evaluation of Performance of PEM Fuel Cells Based on Carbon Cloth Gas Diffusion Electrodes Table 2 The fitting parameters for the impedance spectra at different current densities (i.e., from OCV to 0.9 A·cm−2 ) and low inlet gas flow rates (H2 /air: 0.2/1 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 0.312 0.312 0.312 0.313 0.313 0.313 GDE1 cathode 0.285 0.285 0.285 0.276 0.276 0.276 GDE1 anode 0.267 0.267 0.267 0.264 0.264 0.264 GDE2 cathode 0.297 0.297 0.290 0.290 — — GDE2 anode 0.316 0.316 0.311 0.319 0.333 0.351 Charge transfer circuit R p (Ω·cm2 )Reference 5.789 0.583 0.274 0.198 0.194 0.220 GDE1 cathode 5.669 0.771 0.505 0.361 0.289 0.261 GDE1 anode 6.271 0.625 0.305 0.233 0.251 0.299 GDE2 cathode 6.748 0.759 0.623 0.584 — — GDE2 anode 6.466 0.620 0.278 0.220 0.224 0.262 CPEp -Q (F/cm2 ) Reference 0.042 0.038 0.042 0.046 0.050 0.055 GDE1 cathode 0.063 0.049 0.053 0.064 0.086 0.088 GDE1 anode 0.045 0.033 0.035 0.037 0.040 0.045 GDE2 cathode 0.030 0.0189 0.084 0.037 — — GDE2 anode 0.046 0.032 0.032 0.035 0.039 0.043 CPEp -n Reference 0.850 0.850 0.850 0.850 0.850 0.850 GDE1 cathode 0.800 0.850 0.850 0.850 0.850 0.850 GDE1 anode 0.800 0.850 0.850 0.850 0.850 0.850 GDE2 cathode 0.750 0.850 0.750 0.850 — — GDE2 anode 0.800 0.850 0.850 0.850 0.850 0.850 C p (F/cm2 )Reference 0.033 0.0196 0.0190 0.0199 0.0219 0.0253 GDE1 cathode 0.048 0.028 0.028 0.033 0.045 0.045 GDE1 anode 0.033 0.017 0.016 0.016 0.018 0.021 GDE2 cathode 0.0176 0.009 0.031 0.019 — — GDE2 anode 0.034 0.016 0.014 0.014 0.017 0.020 f p (Hz)Reference 0.832 13.901 30.618 40.490 37.447 28.578 GDE1 cathode 0.580 7.439 11.370 13.391 12.188 13.514 GDE1 anode 0.772 15.236 33.191 42.838 35.531 25.123 GDE2 cathode 1.341 23.459 8.133 14.625 — — GDE2 anode 0.724 16.010 41.736 50.220 41.618 30.992 Mass transfer circuit R d (Ω·cm2 )Reference — — — 0.042 0.091 0.209 GDE1 cathode — — — 0.280 0.783 1.682 GDE1 anode — — — 0.060 0.142 0.368 GDE2 cathode — — 0.178 1.891 — — GDE2 anode — — 0.037 0.067 0.131 0.314 CPEd -Q (F/cm2 ) Reference — — — 0.912 0.412 0.187 GDE1 cathode — — — 0.124 0.069 0.051 GDE1 anode — — — 0.598 0.253 0.113 GDE2 cathode — — 0.161 0.033 — — GDE2 anode — — 0.945 0.523 0.276 0.129 CPEd -n Reference — — — 1.000 1.000 1.000 GDE1 cathode — — — 1.000 1.000 1.000 GDE1 anode — — — 1.000 1.000 1.000 GDE2 cathode — — 1.000 1.000 — — GDE2 anode — — 1.000 1.000 1.000 1.000 C d (F/cm2 )Reference — — — 0.912 0.412 0.187 GDE1 cathode — — — 0.124 0.069 0.051 GDE1 anode — — — 0.598 0.253 0.113 GDE2 cathode — — 0.161 0.033 — — GDE2 anode — — 0.945 0.523 0.276 0.129 f d (Hz)Reference — — — 4.184 4.239 4.068 GDE1 cathode — — — 4.585 2.939 1.844 GDE1 anode — — — 4.400 4.425 3.817 GDE2 cathode — — 5.535 2.575 — — GDE2 anode — — 4.528 4.537 4.379 3.934
