Cu/N表面沉积共掺杂TiO2光催化剂作用机理的理论研究*
Research of the synergistic effects in Cu/N co-dop ed TiO2 surface:A DFT calculation
-
摘要: 本文采用基于周期性密度泛函理论研究了Cu/N表面沉积共掺杂对锐钛矿相TiO2(001)面的修饰作用。计算了Cu在不同位置掺杂TiO2(101)面和(001)面的形成能,并在此基础上计算N不同位置掺杂TiO2(001)面及Cu/TiO2(001)面的形成能,通过形成能的比较获得了表面共掺杂的最优化结构。在此基础上计算了最稳定结构的能带结构及态密度,并与S单掺杂TiO2(001)面最稳定结构进行了对比。通过对结果的分析发现:Cu/N在(001)表面的沉积共掺杂有效降低了TiO2的禁带宽度,并在表面形成CuO2相,更利于提高其光催化活性。
-
关键词:
- 密度泛函理论 /
- Cu/N掺杂TiO2 /
- 最优化表面 /
- 形成能
Abstract: First principles density functional theory calculations are carried out to investigate the interactions between im-planted copper and nitrogen atoms at the anatase TiO2(001) surface. The doped configurations and formation energies of Cu on TiO2 (001) and TiO2 (101) surfaces, N on TiO2(001) and Cu/TiO2(001) surfaces have been considered, and the perfected structures are obtained. Compared with the S/TiO2(001) perfected structure, the analyses of the band structure and density of states of Cu/N-TiO2(001) show that the band gap is decreased obviously when the CuO2 state occurrs;this could improve the photocatalytic activity significantly. -
-
计量
- 文章访问数: 506
- HTML全文浏览数: 272
- PDF下载数: 0
- 施引文献: 0