Tailoring energy bands and internal polarization in ZnIn 2 S 4 for synergistic enhancement of carrier separation and high-performance Piezo-PEC water splitting

This study proposes a Cu–Fe co-doping strategy for ZnIn 2 S 4 :Cu at Zn sites forms band gap intermediate energy levels for electron transitions; Fe at In sites affects internal polar structures, synergistically optimizing catalytic activity.