Nature of Activated Manganese Oxide for Oxygen Evolution

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Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
§ Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
Cite this: J. Am. Chem. Soc. 2015, 137, 47, 14887–14904
Publication Date (Web):November 2, 2015
Copyright © 2015 American Chemical Society
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Electrodeposited manganese oxide films (MnOx) are promising stable oxygen evolution catalysts. They are able to catalyze the oxygen evolution reaction in acidic solutions but with only modest activity when prepared by constant anodic potential deposition. We now show that the performance of these catalysts is improved when they are “activated” by potential cycling protocols, as measured by Tafel analysis (where lower slope is better): upon activation the Tafel slope decreases from ∼120 to ∼70 mV/decade in neutral conditions and from ∼650 to ∼90 mV/decade in acidic solutions. Electrochemical, spectroscopic, and structural methods were employed to study the activation process and support a mechanism where the original birnessite-like MnOx (δ-MnO2) undergoes a phase change, induced by comproportionation with cathodically generated Mn(OH)2, to a hausmannite-like intermediate (α-Mn3O4). Subsequent anodic conditioning from voltage cycling or water oxidation produces a disordered birnessite-like phase, which is highly active for oxygen evolution. At pH 2.5, the current density of activated MnOx (at an overpotential of 600 mV) is 2 orders of magnitude higher than that of the original MnOx and begins to approach that of Ru and Ir oxides in acid.

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  • Figure S1, CV and Tafel plot (OER) of MnOx deposited by CV without buffer; Figure S2, Tafel plots (OER) of MP deposited MnOx, varying cathodic E; Figure S3, Faradaic efficiency of OER on activated MnOx by O2 sensor; Figure S4, OER stability of activated MnOx at pH 7.0, 2.5, and 0.3; Figure S5, Tafel plots of OER on activated MnOx before and after stability test; Figure S6, electrochemical surface area measurements of FTO and C cloth; Figure S7, electrochemical impedance spectroscopy of MnOx films; Figure S8, CV–QCM it plot of MnOx deposition in Mn2+ solution with KNO3; Figure S9, QCM plot of multipotential deposition of activated MnOx; Figure S10, CV–QCM plot in Mn2+-free KNO3 solution; Figure S11, CV–QCM plot in Mn2+ buffered by MePi at pH 8.0; Figure S12, QCM plot of cathodic deposition at −0.4 V and with anodic pulse; Figure S13, high-resolution XPS of manganese oxide control compounds; Figure S14, PXRD patterns of MnOx thin films; Figure S15, PXRD patterns of manganese oxide control compounds; Figure S16, PDF of manganese oxide control compounds; Figure S17, Tafel plot of as-deposited MnOx showing MnO4 region at high E; Table S1, fitting parameters for electrochemical impedance spectroscopy; Table S2, Pearson’s coefficients of PDF pairs between MnOx and control samples; and Table S3, summary of PDF fitting results for MnOx samples and control samples (PDF)

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