Integrated p-n Junctions for Efficient Solar Water Splitting upon TiO2/CdS/BiSbS3 Ternary Hybrids for Improved Hydrogen Evolution and Mechanistic Insights

The development of efficient and novel p-n heterojunctions for photoelectrochemical (PEC) water splitting is still a challenging problem. We have demonstrated the complementary nature (p-type) BiSbS3 as sensitizer when coupled with (n-type) TiO2/CdS to improve photocatalytic activity solar hydrogen conversion efficiency. as-prepared heterojunction TiO2/CdS/BiSbS3 exhibits good visible light harvesting capacity high charge separation over binary heterojunction, which are confirmed by photoluminescence (PL) electrical impedance spectroscopy (EIS). ternary produces higher H2 than systems TiO2/BiSbS3. This system displayed highest photocurrent density 5 mA·cm?2 at 1.23 V vs. reversible electrode (RHE) in neutral conditions, STH 3.8% 0.52 RHE observed. improved response was due favorable energy band positions CdS BiSbS3. study highlights junction made up TiO2/CdS/BiSbS3, promises formation, separation, suppression recombination PEC Further, no appreciable loss observed photoanode 2500 s. Band alignment interfaces mechanisms been studied well.