Fig. 3: Electrochemical and spectroscopic characterizations of FOH-Nafion ionomer. | Nature Communications

Fig. 3: Electrochemical and spectroscopic characterizations of FOH-Nafion ionomer.

From: Ionomer engineering for optimized water channels in industry-scale water electrolysis using non-noble metal catalyst

Fig. 3: Electrochemical and spectroscopic characterizations of FOH-Nafion ionomer.

a Proton conductivity of FOH-Nafion and Nafion membranes before and after Co2+ contamination calculated from EIS curves at 26, 34, 42, and 50 °C. b The KIE values against overpotential of Nafion/Co3O4 and FOH-Nafion/Co3O4 tested in a three-electrode system without a membrane in 0.5 M H2SO4. c The Eapp plots against overpotential of Nafion/Co3O4 and FOH-Nafion/Co3O4. The corresponding Eapp are calculated from CV curves recorded at different temperatures in 0.5 M H2SO4. d Co 2p3/2 XPS spectra of Co3O4, FOH-Nafion/Co3O4, and Nafion/Co3O4. In situ electrochemical ATR-SEIRAS spectra recorded in the potential range of 1.11 to 2.01 V with an interval of 0.1 V (vs. RHE) for (e) Nafion/Co3O4 and (f) FOH-Nafion/Co3O4 in 0.1 M HClO4. g Intensity ratio of -SO3* and *OOH measured at different potentials. Source data are provided as a Source Data file.

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