PbS/CdS/TiO₂ナノチューブアレイの作製と光電気化学応答および光カソード保護性能の向上

A ternary stepped heterojunction of PbS/CdS/TiO₂was fabricated using the successive ionic layer adsorption and reaction method, which significantly enhanced the photocathodic protection performance of TiO₂. The experimental results demonstrate the superiority of the dual-loading modification over its single-loading counterparts. The co-loading of CdS and PbS resulted in a TiO₂nanocomposite with a reduced bandgap of 1.0 eV, a further extended light absorption range, and enhanced visible light utilization efficiency. The PbS/CdS/TiO₂electrode exhibited a photogenerated current density of 6.46 mA cm^-2, which is 1.6 times and 22.1 times higher than that of PbS/TiO₂and pure TiO₂, respectively. The dual loading of metal sulfide semiconductors markedly improved the photoelectrochemical properties of TiO₂and its corresponding photocathodic protection effect.