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Abstract.A novel nonenzymatic hydrogen peroxide (H 2 O 2 ) sensor was fabricated, based on composite Pd-Co oxide films modified n-silicon electrode. The modified electrode was consisted of platinum coated n-silicon as substrate prepared by vacuum evaporating a platinum coating and composite Pd-Co oxide films deposited by electrochemical technique. The morphology of the modified electrode was characterized via scanning electron microscope (SEM). The analytical performances of the modified electrode for determination of H 2 O 2 were investigated by cyclic voltammetry (CV) and chronoamperometry. A new two electrodes photo-electrochemical cell has been used as sensor for H 2 O 2 determination by photocurrent measurements at zero voltage. The sensor showed good photocurrent responses by adding different concentrations of H 2 O 2 with a good stability. The linear ranges for the detection of H 2 O 2 are 2 to 48 ȝM with a detection limit of 0.57 ȝM in pH=7.0 phosphate buffer solution (PBS). In addition, the sensor also exhibited superior stability, anti-interference and portability. These features demonstrated that the new photo-electrochemical sensor was suitable for detection of H 2 O 2 on site outdoors..