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SEM images for an electrochemically anodized pillar with the white rectangular box in (A) indicating the zoomed-in region shown in (B) and the same magnification scheme for (C). The pillar diameter is 5 μm, the pillar height is 18 μm, the inter-pillar distance is 2.5 μm, the porous shell thickness is 300 nm, and the pore diameter is ~30 nm. Used with permission from the Royal Society of Chemistry from reference [56].
