Ferroelectric polarization in Bi_(0.9)Dy_(0.1)FeO_(3)/g-C_(3)N_(4)Z-scheme heterojunction boosts photocatalytic hydrogen evolution

铁电极化促进Z型异质结光催化析氢

Delivering excellent carrier separation through ferroelectric polarization is desirable to achieve effective solar hydrogen conversion.Here,Bi_(0.9)Dy_(0.1)FeO_(3)/g-C_(3)N_(4)(BDFO/GCN)Z-scheme photocatalyst was constructed by loading BDFO nanoparticles onto sheet-like GCN,in which BiFeO_(3)(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%degradation of Rhodamine B(RhB)under simulated sunlight.The evolution rate of hydrogen was improved from approximately 742.5 to 1084.0μmol·g^(−1)·h^(−1)after polarization.This remarkable activity is attributed to the improved carrier separation facilitated by the internal polarization field.This work offers novel insights into the rational design of efficient ferroelectric photocatalysts.

铁电极化可以通过促进载流子分离以实现有效的光催化产氢.本文通过在片状g-C_(3)N_(4)上负载Bi_(0.9)Dy_(0.1)FeO_(3)纳米颗粒,构建了Bi_(0.9)Dy_(0.1)FeO_(3)/g-C_(3)N_(4)的Z型光催化剂.BiFeO_(3)中掺杂稀土元素Dy形成Bi_(0.9)Dy_(0.1)FeO_(3),减小了光学带隙并增强了铁电性能.Bi_(0.9)Dy_(0.1)FeO_(3)的剩余极化有效地促进了光生载流子的分离和传输,Z型光催化剂在光催化降解和光催化析氢过程中表现出稳定的反应活性.在模拟阳光照射下,极化后的Z型光催化剂对RhB的降解率达到100%.氢的析出速率从约742.5提高到1084.0μmol·g^(-1)·h^(-1).显著增强的光催化活性可归因于内部极化场对载流子的促进作用.这些结果为合理设计有效的铁电光催化剂提供了新的见解.