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A. Comparison of XANES data collected on as prepared MnOx/Au-Si3N4 film and on MnOx/Au-Si3N4 film after in-situ exposure to ORR and OER relevant conditions. B. MnOx /Au-Si3N4 film poised at 0.7 V overlayed with MnO, Mn3O4, alpha-Mn2O3, and gamma-MnOOH. C. MnOx /Au-Si3N4 film poised at 1.8 V overlayed with Mn3O4, alpha-Mn2O3, birnessite, and beta-MnO2.
