Engineered Environment-Friendly Colloidal Core/Shell Quantum Dots for High-Efficiency Solar-Driven Photoelectrochemical Hydrogen Evolution.

"Green" colloidal quantum dots (QDs)-based photoelectrochemical (PEC) cells are promising solar energy conversion systems possessing environmental friendliness, cost-effectiveness, and highly efficient solar-to-hydrogen conversion. In this work, eco-friendly AgInSe (AISe)/ZnSe core/shell QDs with wurtzite (WZ) phase were synthesized for solar hydrogen production. It was demonstrated that appropriately engineering the ZnSe shell thickness resulted in effective surface defects passivation of the AISe core for suppressed charge recombination in the consequent core/shell AISe/ZnSe QDs. The fabricated environmentally friendly core/shell QDs-based PEC device exhibited improved photo-excited electrons extraction efficiency under optimized conditions and delivered a maximum photocurrent density as high as 7.5 mA cm and long-term durability under standard AM 1.5G illumination (100 mW cm ). These findings suggest that AISe/ZnSe core/shell QDs with tailored optoelectronic properties are potential light sensitizers for eco-friendly, cost-effective, and highly efficient solar energy conversion applications.