Cerium’s Photocatalytic Superpower: Unlocking Titanium Dioxide’s Visible Light Absorption
The date of：
2023-04-24
viewed:
4
The introduction of rare earth elements into TiO2 can effectively improve the electron-hole separation of TiO2 and prolong the visible light response of TiO2.Cerium (Ce) shows variable valence states Ce3+/Ce4+ with different electronic structures (4f15d0 and 4f05d0, respectively) among rare earth elements, which easily form oxygen vacancies. Ce element with unique electronic structure can be used to modify semiconductor photocatalysts to improve their photocatalytic performance.In a study published in the journal Molecule, the research group led by Prof. LU Canzhong from Fujian Institute of Research on the Structure of Matter of the Chinese Academy of Sciences, reported the visible light absorption of Ce/TiO2.The researchers achieved simultaneous doping of Ce in the TiO2 lattice using a simple sol-gel method which achieved Ce synchronous doping in the lattice of TiO2. They observed morphology and structure of the pure TiO2, Ce-doped TiO2 (Ce/TiO2), and CeO2-mixed TiO2 (CeO2-TiO2) samples by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). They found that Ce doping in the lattice of anatase TiO2 resulted in a smaller grain size of the sample.Besides, the researchers revealed the high photocurrent density (10.9 µA×cm-2) of Ce/TiO2 by linear sweep voltammetry (LSV) test, which is 2.5 times that of common TiO2 material (4.3 µA×cm-2). They evaluated the light absorption range of Ce/TiO2 using incident photo-to-current efficiency (IPCE) test. Ce/TiO2 shows visible light absorption up to 500 nm, while pure TiO2 shows no obvious response in the visible region.Moreover, the researchers unveiled that the electron-trapping centers formed by Ce doping into the TiO2 lattice improved the separation efficiency of photogenerated electrons and holes. The narrow bandgap of Ce-doped TiO2 showed excellent visible light absorption and photocurrent response. Due to the Ce doping, the Ce/TiO2 samples achieved high photocurrent density and incident photon current efficiency (IPCE).This study provides a practical strategy and an important reference for the preparation and understanding of highly efficient visible light-activated rare earth-doped photocatalysts.Reference: “Cerium Synchronous Doping in Anatase for Enhanced Photocatalytic Hydrogen Production from Ethanol-Water Mixtures” by Mei-Hong Tong, Yan-Xin Chen, Tian-Ming Wang, Shi-Wei Lin, Gen Li, Qian-Qian Zhou, Rui Chen, Xia Jiang, Hong-Gang Liao and Can-Zhong Lu, 7 March 2023, Molecule.
Hot News
/
Related to recommend
2025
-
08
-
15
Click on the number of times:
0
Dual-Modified C–Ce–Mn2O3 Heterostructured Anode Catalytic Layer with Ultrastable OER Performance in Concentrated H2SO4 for Sustainable Nonferrous Metal Electrodeposition来源：ACS PublicationsMn2O3 emerge...
2025
-
08
-
14
Click on the number of times:
0
Alkali Metal Substitution-Induced Structural Transformation for RbREP2Se6 (RE = Gd, Tb, Dy) with Second-Harmonic Generation Responses来源：ACS PublicationsRare-earth (RE) chalcogenides have been extensiv...
2025
-
08
-
14
Click on the number of times:
1
Near-Ultraviolet-Induced Narrow-Band Emission Phosphors Eu3+-Activated YCa4O(BO3)3 for Backlight-Display and White Light-Emitting Diodes来源：ACS PublicationsDeveloping red emission materials with high e...
2025
-
08
-
12
Click on the number of times:
0
Unraveling the Extraction and Complexation Trends of Rare-Earth Elements with a Nitrilotriacetamide Ligand 来源：ACS PublicationsThe nitrilotriacetamide n-octyl derivative ligand (NTAamide(n-Oct)) i...