Influence of the surface morphology of smooth platinum electrodes for the sodium borohydride oxidation reaction |
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| Affiliation: | 1. Laboratoire d''Électrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), UMR 5279, CNRS/Grenoble-INP/Université de Savoie/Université Joseph Fourier, 1130 Rue de la Piscine, BP75, 38402 Saint Martin d''Hères Cedex, France;2. Laboratoire de Génie Chimique, Institut de Chimie (Bât. B6a), Université de Liège, B-4000 Liège, Belgium;3. Science et Ingénierie des MAtériaux et Procédés (SIMAP), 1130 Rue de la Piscine, BP75, 38402 Saint Martin d''Hères Cedex, France;4. French University Institute (IUF), France;1. CBMN, UMR 5248 CNRS, Université de Bordeaux, 2 Rue Robert Escarpit, 33607 Pessac Cedex, France;2. Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan;1. Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, One Brookings Drive, Box 1180, Brauer Hall, St. Louis, MO 63130, USA;2. Saint Louis University, Parks College of Engineering, Aviation & Technology, 3450 Lindell Blvd, St. Louis, MO 63103, USA |
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| Abstract: | In this study, we show that the platinum electrode preparation procedure influences its behavior towards the borohydride electrooxidation reaction (BOR) mechanism. Cycling a smooth polycrystalline Pt electrode in alkaline electrolyte within the water stability domain prior to the BOR characterization radically changes the shape of the BOR voltammogram obtained in hydrodynamic conditions using the rotating disk electrode (RDE) setup, compared to the “classical” one measured on a smooth polycrystalline Pt electrode just polished before the BOR RDE study. This particular BOR voltammogram is reversibly brought back to the “classical” one after voltammetric cycling in borohydride alkaline media. These changes in the BOR voltammogram highlight the sensitivity of the BOR mechanism towards the Pt surface morphology. A first comparison of the Pt electrode surface before and after the voltammetric cycling in alkaline media using tapping mode atomic force microscopy (AFM) shows no morphological differences between the two surfaces within the AFM observation range, suggesting a very fine atomic structure disordering of the Pt surface. Such strong dependence of the BOR mechanism on Pt regarding the electrode atomic structuring opens the way to future studies focusing on the BOR on well-defined Pt single crystals. |
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