Download PDF by Sandra Haschke: Electrochemical Water Oxidation at Iron(III) Oxide

By Sandra Haschke

ISBN-10: 3658092866

ISBN-13: 9783658092863

ISBN-10: 3658092874

ISBN-13: 9783658092870

Sandra Haschke offers a technique to reinforce the Fe2O3 electrode functionality by way of managed nanostructuring of the catalyst floor, according to anodized aluminum oxide covered via atomic layer deposition. in addition, she investigates the effect of underlying conductive layers and post-deposition annealing at the electrode functionality and the linked adjustments in morphology and chemical composition. Exploiting all results mixed grants a rise in steady-state water oxidation throughput by means of an element of 2.5 with appreciate to planar electrodes.

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Additional info for Electrochemical Water Oxidation at Iron(III) Oxide Electrodes: Controlled Nanostructuring as Key for Enhanced Water Oxidation Efficiency

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Ling, D. A. Wheeler, K. E. N. George, K. Horsley, C. Heske, J. Z. Zhang, Y. Li, Nano Lett. 2011, 11, 3503. [51] V. Roscher, M. Licklederer, J. Schumacher, G. Reyes Rios, B. Hoffmann, S. Christiansen, J. Bachmann, Dalton Trans. 2014, 43, 4345. [52] J. W. Elam, S. M. George, Chem. Mater. 2003, 15, 1020. [53] J. Lee, D. Lee, D. Lim, K. Yang, Thin Solid Films 2007, 515, 6094. [54] G. Luka, B. Witkowski, L. Wachnicki, R. Jakiela, I. Virt, M. Andrzejczuk, M. Lewandowska, M. Godlewski, Mater. Sci. , B 2014, 186, 15.

5 min at alternating potential (–400 mV and 0 V) inside 22 μm long Al2O3 templates which were previously opened unilateral and equipped with a 500 ± 100 nm thick electrical contact of copper and gold. The time of growth was selected in such a way that overgrowing was prevented and that the tube length accounted to approximately 10 μm. The successful growth is proven by the removal of templates in 1 M NaOH solution as depicted in Figure 16. SEM micrographs picture collapsed and broken platinum nanotubes grown on the electrical contact, whereby parts of Al2O3 are still visible (see Figure 16b).

Whether the accurate limit is at 14 μm or between 14 and 23 μm, will be a subject for further studies. Likewise, pore lengths of less than 7 μm down to 1 μm have to be investigated in order to complete the systematic study. 49 V applied overpotential. Fe2O3 has sufficient electrical conductivity at the relatively low current densities investigated here, so that additional conductive layers do not yield an improvement in the electrode performance. XPS and EIS characterizations of the electrodes reveal that ALD of the catalyst results in a smooth and hydrated Fe2O3.

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Electrochemical Water Oxidation at Iron(III) Oxide Electrodes: Controlled Nanostructuring as Key for Enhanced Water Oxidation Efficiency by Sandra Haschke


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