Fig. 3: Electrocatalytic performance and stability study after OER. | Nature Communications

Fig. 3: Electrocatalytic performance and stability study after OER.

From: Surface sulfonic-group bonded oxygen evolution catalyst for proton exchange membrane water electrolysis

Fig. 3: Electrocatalytic performance and stability study after OER.

a The LSV curves of Ir/IrOx ~ SO3H and Ir/IrOx catalysts recorded in 0.5 M H2SO4 solution at 80 °C. b Polarization curves of PEMWEs assembled with Ir/IrOx ~ SO3H anode and Ir/IrOx anode, respectively. c Chronopotentiometry curves of a PEMWE assembled with either Ir/IrOx ~ SO3H or Ir/IrOx anodes at 1.0 A cm−2. The temperature of the input water was controlled at 80 °C. The measured ohmic resistance was 24.9 ± 0.1 mΩ for the Ir/IrOx ~ SO3H-PEMWE and 23.4 ± 0.1 mΩ for the Ir/IrOx-PEMWE. d FTIR spectra and e S 2p XPS spectra of Ir/IrOx ~ SO3H catalyst before and after OER. Source data are provided as a Source data file.

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