Fig. 5: Impedance analysis of BPM electrolyzers.
From: Design principles for water dissociation catalysts in high-performance bipolar membranes
a Nyquist plots of BPM electrolyzers at 30 mA cm−2 with different loadings of TiO2-P25 deposited by spray coating WD catalysts. The high frequency semicircle is assigned to WD, while the low frequency one to charge transfer. The inset shows the equivalent circuit used to fit the EIS data. b Extracted resistance values at 450 mA cm−2 as a function of TiO2-P25 loading. c Comparison of series resistance Rs (orange) extracted from BPM electrolyzer EIS data at 450 mA cm−2 with the resistance of PEM (red) and AEM (blue) electrolyzers at 300–500 mA cm−2 as a function of TiO2-P25 loading.
