Fig. 4: Quasi in situ XPS, operando SERS, and operando DEMS measurements understanding the mechanism on Cr0.2Ru0.8O2-x catalyst during OER. | Nature Communications

Fig. 4: Quasi in situ XPS, operando SERS, and operando DEMS measurements understanding the mechanism on Cr0.2Ru0.8O2-x catalyst during OER.

From: Cr dopant mediates hydroxyl spillover on RuO2 for high-efficiency proton exchange membrane electrolysis

Fig. 4

a Quasi in situ XPS spectra of Cr 2p3/2 for Cr0.2Ru0.8O2-x under applied potentials from OCP to 1.8 V. b Area ratio of Cr3+-OH and OER current (without iR correction) as a function of applied potential for Cr0.2Ru0.8O2-x. c Operando SERS spectra of Ru-O and Cr-OH bands for Cr0.2Ru0.8O2-x under applied potentials from OCP to 1.8 V. d Normalized peak areas of Cr-OH and Ru-OOH as a function of applied potential for Cr0.2Ru0.8O2-x and homemade RuO2. e Operando DEMS measurements for Cr0.2Ru0.8O2-x. Top: CV cycles (without iR correction); middle: DEMS signals of 32O2 (16O + 16O) and 34O2 (16O + 18O) collected during CV cycles; bottom: signal intensity ratio of 34O2:32O2. f Schematic illustration of dopant-mediated hydroxyl spillover mechanism on Cr0.2Ru0.8O2-x for acidic OER.

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