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2. Visible light-induced electronic structure modulation of Nb- and Ta-doped α-Fe2O3 nanorods for effective photoelectrochemical water splitting

Author

Jin-Ming Chen, Jyh Fu Lee, Ying-Rui Lu, Han Wei Chang, Wu-Ching Chou, Shaohua Shen, Yanming Fu, Wan Yi Lee, Chi-Liang Chen, Yu-Cheng Huang, Chung-Li Dong, and Jeng Lung Chen

Subjects
X-ray absorption spectroscopy, Materials science, Absorption spectroscopy, Dopant, Mechanical Engineering, Doping, Analytical chemistry, Bioengineering, 02 engineering and technology, General Chemistry, Electronic structure, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Mechanics of Materials, Water splitting, General Materials Science, Nanorod, Electrical and Electronic Engineering, 0210 nano-technology, Visible spectrum
Abstract

The photoelectrochemical (PEC) water splitting activity of Nb and Ta-doped hematite (α-Fe2O3) nanorods was investigated with reference to electronic structures by in situ synchrotron x-ray absorption spectroscopy (XAS). Current density-potential measurements demonstrate that the PEC activity of α-Fe2O3 nanorods depends strongly on the species and concentrations of dopants. The doping of α-Fe2O3 nanorods with a low level of Nb or Ta can improve their electrical conductivity and thereby facilitate charge transport and reduced electron-hole recombination therein. The photoconversion effects of Nb and Ta-doped α-Fe2O3 by in situ XAS in the dark and under illumination revealed opposite evolutions of the spectral intensities of the Fe L-edge and Nb/Ta L-edge, indicating that charge transfer and a conduction pathway are involved in the photoconversion. Analytic in situ XAS results reveal that the α-Fe2O3 that is doped with a low level of Nb has a greater photoconversion efficiency than that doped with Ta because Nb sites are more active than Ta sites in α-Fe2O3. The correlation between PEC activity and the electronic structure of Nb/Ta-doped α-Fe2O3 is examined in detail using in situ XAS and helps to elucidate the mechanism of PEC water splitting in terms of the electronic structure.

Published
2018
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3. Visible light-induced electronic structure modulation of Nb- and Ta-doped α-Fe2O3 nanorods for effective photoelectrochemical water splitting.

Author

Han-Wei Chang, Yanming Fu, Wan-Yi Lee, Ying-Rui Lu, Yu-Cheng Huang, Jeng-Lung Chen, Chi-Liang Chen, Wu Ching Chou, Jin-Ming Chen, Jyh-Fu Lee, Shaohua Shen, and Chung-Li Dong

Subjects
*TANTALUM compounds, *WATER electrolysis, *ELECTRONIC structure
Abstract

The photoelectrochemical (PEC) water splitting activity of Nb and Ta-doped hematite (α-Fe2O3) nanorods was investigated with reference to electronic structures by in situ synchrotron x-ray absorption spectroscopy (XAS). Current density-potential measurements demonstrate that the PEC activity of α-Fe2O3 nanorods depends strongly on the species and concentrations of dopants. The doping of α-Fe2O3 nanorods with a low level of Nb or Ta can improve their electrical conductivity and thereby facilitate charge transport and reduced electron–hole recombination therein. The photoconversion effects of Nb and Ta-doped α-Fe2O3 by in situ XAS in the dark and under illumination revealed opposite evolutions of the spectral intensities of the Fe L-edge and Nb/Ta L-edge, indicating that charge transfer and a conduction pathway are involved in the photoconversion. Analytic in situ XAS results reveal that the α-Fe2O3 that is doped with a low level of Nb has a greater photoconversion efficiency than that doped with Ta because Nb sites are more active than Ta sites in α-Fe2O3. The correlation between PEC activity and the electronic structure of Nb/Ta-doped α-Fe2O3 is examined in detail using in situ XAS and helps to elucidate the mechanism of PEC water splitting in terms of the electronic structure. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

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