Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 225, Issue -, Pages 128-133Publisher
ELSEVIER
DOI: 10.1016/j.mseb.2017.08.022
Keywords
Water splitting; Photocathode; Silicon carbide; Noble metal nanoparticles
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Photoelectrochemical water splitting is a promising method to produce H-2 by making use of solar energy. In this paper we report on a photocathode made by p-type crystalline Si covered with an n-type 3C-SiC polycrystalline film, acting as protective layer and transparent emitter. The photoelectrodes exhibit a saturated photocurrent above 30 mA cm(-2). No decay is observed after 9 h under constant current stress at 1 kW m(-2) with AM1.5G spectrum illumination. Improvement of the photocurrent value is achieved by covering the 3C-SiC emitter with Au or Pt nanoparticles. Under suitable metal nanoparticles deposition conditions, compared to the samples without nanoparticles, two major effects are observed: first the onset potential is considerably reduced, and second, higher saturated photocurrent is found, up to 38 mA cm(-2), i.e. with a 27% increase. Optical and micro structural studies on the nanoparticles provide insights on the origin of the observed effects.
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