Applied voltage between anode (TiO₂) nanoparticles and cathode (Pt) in a water photolysis reactor drastically increased water photolysis-induced photocurrent and hydrogen production. The amounts of hydrogen production increased by 30 times with a small applied voltage of 1.5 V. The notable increase of hydrogen production was explained in terms of the decreased Schottky contact potential barrier at indium tin oxide (ITO)/TiO₂ by the applied voltage, while at high voltage regime, the alteration of the Helmholtz layer by the applied voltage further modifies the voltage-assisted increase of the photocurrent.

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