Ferroelectric Polarization in Bi0.9Dy0.1FeO3/g-C3N4 Z-scheme Heterojunction Boosts Photocatalytic Hydrogen Evolution

Delivering excellent carrier separation through ferroelectric polarization is desirable to achieve effective solar hydrogen conversion. Here, Bi0.9Dy0.1FeO3/g-C3N4 (BDFO/GCN) Z-scheme photocatalyst was constructed by loading BDFO nanoparticles onto sheet-like GCN, in which BiFeO3 (BFO) was doped with the rare-earth element Dy to narrow the optical bandgap and enhance the ferroelectric property. Residual polarization effectively promoted the separation and transport of photo-generated carriers in BFO, and the Z-scheme exhibited stable reaction activity during photocatalytic degradation and photocatalytic hydrogen evolution. Through electric polarization, the heterojunction photocatalyst achieves 100