用于光电化学水分解的ZnSe/TiSe2层状金字塔异质结构的生长

The present study investigates the integration of charge density wave material TiSe 2 pyramids grown on Ti metal foil with wide bandgap ZnSe film for sunlight-driven water-splitting. X-ray diffraction and X-ray photoelectron spectroscopy analysis verified the excellent crystallinity and successful fabrication of the ZnSe/TiSe 2 pyramids heterostructure. The photoelectrochemical measurements were performed in 0.5 M Na 2 SO 4 electrolyte under AM = 1.5 G solar condition, demonstrating ZnSe/TiSe 2 exhibited photocurrent density of 175.2 µA/cm 2 at 0.8 V vs Ag/AgCl. The enhanced photocurrent density is attributed to the excellent electrical conductivity between ZnSe and TiSe 2 , increased catalytic sites, and rapid charge carrier separation and migration due to favorable band alignment between ZnSe and TiSe 2 . These results underscore the potential of TiSe 2 -based heterostructure in optimizing solar-to-hydrogen conversion and offer insights into band engineering for improving PEC performance.