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Current-potential curves of plain with and without illumination. NaOH was used as an electrolyte. The inset shows the time dependence of gas volume at zero external voltage. The dotted line represents ideal evolution, assuming a photocurrent of at zero external voltage is maintained.
SEM images of sample before use, for which both metal stripes and ridges were patterned. The stripes and ridges are aligned along . The inset schematically illustrates the sample with an Ohmic contact electrode and a metal wire.
Current-potential curves of plain (sample 1), with metal stripes (sample 2), and with metal stripes and ridges (sample 3) under illumination. NaOH was used as an electrolyte.
(a) Plane view and (b) cross-sectional SEM images of sample after use, for which both metal stripes and ridges were patterned. The thickness of the underlayer was left unchanged. However, the triangular ridges were smaller than the original ones. The metal stripes were partially eroded and many pores were formed on the exposed surface.
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