Electrospinning preparation of Sn4+-doped BiFeO3 nanofibers as efficient visible-light-driven photocatalyst for O-2 evolution
Electrospinning preparation of Sn4+-doped BiFeO3 nanofibers as efficient visible-light-driven photocatalyst for O-2 evolution
复制标题
静电纺丝制备 Sn4 掺杂 BiFeO3 纳米纤维作为高效可见光驱动 O-2 析出光催化剂
DOI：
10.1016/j.jallcom.2018.06.329
复制
发表时间：
2018
影响因子：
6.2
通讯作者：
Hu Yong
中科院分区：
文献类型：
--
作者：
Ren Jiabin;Zhao Dian;Liu Huanhuan;Zhong Yijun;Ning Jiqiang;Zhang Ziyang;Zheng Changcheng;Hu Yong
金属离子掺杂被认为是提高原始光催化剂光催化活性的有效策略，通过掺杂诱导缺陷态实现快速电荷转移和分离效果。我们在此报告了通过简单的静电纺丝技术和随后的退火处理制备均匀的一维（1D）Sn4+掺杂的BiFeO3（Sn-BFO）纳米纤维（NF）。得益于金属离子掺杂和独特的一维结构，所制备的 Sn-BFO NF 催化剂在 O2 析出方面表现出显着增强的光催化性能，并在可见光照射下提高了光稳定性。通过实验研究和密度泛函理论（DFT）计算表明，掺杂的Sn原子被纳入BFO晶格中，有效地改变了BFO的能带结构并产生了与缺陷相关的能级，从而增强了光吸收并提高了电荷转移和分离效率。此外，最佳 Sn4+ 掺杂百分比为 1.0%，平均 O2 析出率为 516.4μmolh−1g−1，几乎是未掺杂 BFO 样品的两倍。
Metal ion doping has been regarded as an effective strategy to improve photocatalytic activity of pristine photocatalysts for rapid charge transfer and separation effects achieved by doping induced defect states. We herein report the fabrication of uniform one-dimensional (1D) Sn4+-doped BiFeO3(Sn-BFO) nanofibers (NFs) by a facile electrospinning technique with subsequent annealing treatment. Benefiting from metal ion doping and the unique 1D structure, the as-prepared Sn-BFO NF catalyst exhibits significantly enhanced photocatalytic performance on O2evolution as well as improved photostability under visible-light illumination. Revealed by experimental investigation as well as density functional theory (DFT) calculation, the doped Sn atoms were incorporated into the BFO lattice and the band structure of BFO was effectively modified and the defect-related energy levels were produced, which leads to the boosted light absorption and improved charge transfer and separation efficiency. Additionally, an optimal Sn4+doping percentage of 1.0% was discovered to achieve an average O2evolution rate of 516.4 μmol h−1g−1, nearly two times as much as the non-doped BFO samples.