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. 2015 Sep 29;10:374. doi: 10.1186/s11671-015-1077-y

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© Liu et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — Surface morphology of Fe₂O₃-Au electrodes with different Au sputtering time. a 10 s; b 15 s; c 25 s; d 35 s. The sputtering current is 30 mA • cm⁻². All electrodes are annealed at 300 °C for 1 h after the sputtering of Au