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. 2016 Apr 5;7:11203. doi: 10.1038/ncomms11203

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(a–f) SEM images of the cycled composite electrodes based on Al₂O₃/C, CeO₂/C, La₂O₃/C, MgO/C, CaO/C and carbon nanostructures, respectively. (g–l) Top view and (m–r) cross-sectional SEM images show typical Al₂O₃/C, CeO₂/C, La₂O₃/C, MgO/C, CaO/C and C nanostructures after cycling, respectively. Scale bars=10μm (a–f) and 1 μm (g–r).