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Current/photocurrent density versus applied potential curves of the photoanodes fabricated on FTO substrates: compact layer (a) and using different AAO templates: φ90 nm (b), φ260 nm (c) and φ400 nm (d). Dark, visible light (λ > 420 nm) and solar AM 1.5 G (55 mW·cm−2) illumination conditions were applied.
