Figure 3 (IMAGE)

Advanced Institute for Materials Research (AIMR), Tohoku University

Figure 3

Caption

LOM mechanism investigation via surface state change and experimental determination: Surface Pourbaix diagrams of (a) *H coverage on NiCo2O4, (b) *H coverage on Ce-NiCo2O4, and (c) various *H2O, *OH, *O, and *H coverages on Ce-NiCo2O4. (d) Schematic models for adsorption of oxygen intermediates on Ce-NiCo2O4. (e) Free energy diagram of the LOM pathway of Ce-NiCo2O4 and NiCo2O4. (f-g) Potential-shifted in situ Raman spectra of NiCo2O4 and Ce-NiCo2O4. (h) The pH-dependence tests with pH values ranging from 14 to 13 for Ce-NiCo2O4. Inset diagrams present the linear relationship between overpotential and pH values for determination of coupling factor TH+e-. (i-j) Detection of 18O-labelled oxygen intermediates for NiCo2O4 and Ce-NiCo2O4. 

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©Hao Li et al.

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