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Direct water photoelectrolysis with patterned
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Direct photoelectrolysis of water was observed using a structured photoanode, aqueous NaOH solution, and platinum cathode. The structured was formed by selective area regrowth using metal stripes defined by photolithography. Gas evolution from both the anode and the platinum cathode was observed under UV irradiation without external bias. The metal stripes eliminated current crowding and the regrowth increased specific surface area. As a result, distinct improvements in photocurrent were achieved. The origin of the photocurrent and the conversion efficiency are discussed based on water-splitting reactions and etchingreactions.
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