부산대학교 도서관

Photoelectrochemical water splitting is the most efficient green engineering approach to convert the sun light into hydrogen energy. The formation of high surface area core-shell heterojunction with enhanced light-harvesting efficiency, elevated charge separation, and transport are key parameters in achieving the ideal water splitting performance of the photoanode. Herein, we demonstrate a first green engineering interfacial growth of the BiVO 4 nanoparticles onto self-assembled WO 3 nanoplates forming WO 3 /BiVO 4 core-shell heterojunction for efficient PEC water splitting performance. The three different WO 3 nanostructures (nanoplates, nanobricks, and stacked nanosheets) were self-assembled on fluorine doped tin oxide glass substrates via hydrothermal route at various pH (0.8–1.2) of the solutions. In comparison to nanobricks and stacked nanosheets, WO 3 nanoplates displayed considerably elevated photocurrent density. Moreover, a simple and low cost green approach of modified chemical bath deposition technique was established for the optimal decoration of a BiVO 4 nanoparticles on vertically aligned WO 3 nanoplates. The boosted photoelectrochemical current density of 1.7 mA cm−2 at 1.23 V vs. reversible hydrogen electrode (RHE) under AM 1.5 G illumination was achieved for the WO 3 /BiVO 4 heterojunction which can be attributed to a suitable band alignment for the efficient charge transfer from BiVO 4 to WO 3 , increased light harvesting capability of outer BiVO 4 layer, and high charge transfer efficiency of WO 3 nanoplates. [ABSTRACT FROM AUTHOR]