Ammonium Metatungstate in Photocatalytic Hydrogen Production

Nanoscale WO₃ prepared from ammonium metatungstate (AMT), with its suitable bandgap (~2.6 eV), effectively absorbs visible light, making it an ideal material for photocatalytic hydrogen production. Photocatalytic water splitting is a key pathway for green hydrogen production, and WO₃’s high photocatalytic efficiency gives it significant advantages in this field.

Nanoscale WO₃ (particle size 10-50 nm) prepared via hydrothermal or spray pyrolysis methods from AMT solutions exhibits excellent photocatalytic performance. Studies show that nano-WO₃ achieves approximately 30% higher hydrogen production efficiency compared to traditional micron-sized WO₃, attributed to its high specific surface area and rapid charge separation. Additionally, doping with metals (e.g., Au, Ag) or non-metals (e.g., N, S) can further broaden WO₃’s light absorption range.