{001}/{101} facets co-exposed TiO 2 microsheet arrays with Lanthanum doping for enhancing photocatalytic CO 2 reduction
- PDF / 2,259,378 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 12 Downloads / 265 Views
{001}/{101} facets co-exposed TiO2 microsheet arrays with Lanthanum doping for enhancing photocatalytic CO2 reduction Xin Liu1,2, Ji Yang1,2, Lanqing Hu1,2,*, Qianqian Shen1,2, Qi Li3, Xuguang Liu1,2, Husheng Jia1,2, and Jinbo Xue1,2,* 1
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, People’s Republic of China 3 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, People’s Republic of China 2
Received: 20 January 2020
ABSTRACT
Accepted: 11 September 2020
{001}/{101} facets co-exposed TiO2 microsheet arrays with Lanthanum doping were prepared by a one-step hydrothermal method. The crystal structure, morphology, photoelectrochemical properties and photocatalytic CO2 reduction performance of La-doped TiO2 MSAs were investigated in detail. The results show that La mainly exists as Ti–O–La bonds through La atoms substituted the Ti atoms with low La dopant. The formation of Ti–O–La bonds also leads to the generation of oxygen vacancies for balancing the charge. However, the La exists as La2O3 particles loaded on TiO2 MSAs with high La dopant. Combining various characterizations and tests, it indicates that the dopant of La enhances photocatalytic activity of TiO2 MSAs by increasing optical absorption, transportation of photoinduced electrons, and effective absorption of CO2. The photocatalytic CO2 reduction main product was CO on La-doped TiO2 MSAs, and CO yield of TiO2 MSAs doped with 1.0% mol La reaches 102 lmol g-1 h-1, which is greatly improved compared to 83.72 lmol g-1 h-1 of pure TiO2 MSAs. Furthermore, the mechanism of La doping for enhanced photocatalytic CO2 reduction of TiO2 MSAs is proposed.
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction The photocatalytic reduction of CO2 to organic compounds has attracted more and more scientists’ attention since Inoue et al. first discovered this
phenomenon in 1979 [1]. TiO2 is widely used in solar cells and environmental treatment due to its good electrochemical stability, non-toxicity, and strong redox capacity. Because the anatase TiO2 has a bandgap of 3.2 eV, it belongs to a wide bandgap semiconductor material and can only be excited by
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04479-0
J Mater Sci: Mater Electron
ultraviolet light with a wavelength less than 389 nm, while visible light with the largest specific gravity in sunlight cannot be effectively used. What’s more worse is that the electron–hole pairs generated by TiO2 are easily recombined to reduce their quantum efficiency [2–4]. Therefore, the anatase TiO2 needs to be modified so that its light absorption edge is redshifted to increase the light absorption capacity. At the same time, the separation efficiency of excited electron–h
Data Loading...
