Semiconductor Heterojunctions for Enhanced Visible Light Photocatalytic H2 Production
Abstract
Semiconductor-based heterojunctions have been shown to be effective photocatalytic materials to overcome the drawbacks of low photocatalytic efficiency that results from a high rate of electron-hole recombination and narrow photo-response range. In this study, we report on the study of heterojunctions made from visible light active, graphitic carbon nitride, g-C3N4), and UV light active, strontium pyroniobate, Sr2Nb2O7. Heterojunctions made from a combination of g-C3N4 and nitrogen-doped Sr2Nb2O7 obtained at different temperatures were also studied to determine the effect of N doping. The photocatalytic performance was evaluated by using photocatalytic hydrogen evolution reaction (HER)from water g under visible light irradiation. It was found that the photocatalytic activities of as prepared heterojunctions are significantly higher than that of individual components under similar conditions. Heterojunction formed from g-C3N4 and N-doped Sr2Nb2O7 at 700°C (CN/SNON-700) showed better performance than heterojunction made from g-C3N4 and Sr2Nb2O7 (CN/SNO). Finally, a plausible mechanism for the heterojunction enhanced photocatalytic activity is proposed based on, relative band positions, and photoluminescence data.
- Authors:
-
- Wake Forest Univ., Winston-Salem, NC (United States). Dept. of Chemistry. Center for Energy, Environment and Sustainability (CEES)
- Wake Forest Univ., Winston-Salem, NC (United States). Center for Energy, Environment and Sustainability (CEES); Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; Wake Forest Univ. (United States); National Science Foundation (NSF)
- OSTI Identifier:
- 1435211
- Grant/Contract Number:
- AC05-00OR22725; DGE-1650044
- Resource Type:
- Accepted Manuscript
- Journal Name:
- MRS Advances
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 55; Journal ID: ISSN 2059-8521
- Publisher:
- Materials Research Society (MRS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; energy generation; heterogenous; photochemical
Citation Formats
Adhikari, Shiba P., Hood, Zachary D., and Lachgar, Abdou. Semiconductor Heterojunctions for Enhanced Visible Light Photocatalytic H2 Production. United States: N. p., 2018.
Web. doi:10.1557/adv.2018.370.
Adhikari, Shiba P., Hood, Zachary D., & Lachgar, Abdou. Semiconductor Heterojunctions for Enhanced Visible Light Photocatalytic H2 Production. United States. https://doi.org/10.1557/adv.2018.370
Adhikari, Shiba P., Hood, Zachary D., and Lachgar, Abdou. Tue .
"Semiconductor Heterojunctions for Enhanced Visible Light Photocatalytic H2 Production". United States. https://doi.org/10.1557/adv.2018.370. https://www.osti.gov/servlets/purl/1435211.
@article{osti_1435211,
title = {Semiconductor Heterojunctions for Enhanced Visible Light Photocatalytic H2 Production},
author = {Adhikari, Shiba P. and Hood, Zachary D. and Lachgar, Abdou},
abstractNote = {Semiconductor-based heterojunctions have been shown to be effective photocatalytic materials to overcome the drawbacks of low photocatalytic efficiency that results from a high rate of electron-hole recombination and narrow photo-response range. In this study, we report on the study of heterojunctions made from visible light active, graphitic carbon nitride, g-C3N4), and UV light active, strontium pyroniobate, Sr2Nb2O7. Heterojunctions made from a combination of g-C3N4 and nitrogen-doped Sr2Nb2O7 obtained at different temperatures were also studied to determine the effect of N doping. The photocatalytic performance was evaluated by using photocatalytic hydrogen evolution reaction (HER)from water g under visible light irradiation. It was found that the photocatalytic activities of as prepared heterojunctions are significantly higher than that of individual components under similar conditions. Heterojunction formed from g-C3N4 and N-doped Sr2Nb2O7 at 700°C (CN/SNON-700) showed better performance than heterojunction made from g-C3N4 and Sr2Nb2O7 (CN/SNO). Finally, a plausible mechanism for the heterojunction enhanced photocatalytic activity is proposed based on, relative band positions, and photoluminescence data.},
doi = {10.1557/adv.2018.370},
journal = {MRS Advances},
number = 55,
volume = 3,
place = {United States},
year = {Tue Apr 17 00:00:00 EDT 2018},
month = {Tue Apr 17 00:00:00 EDT 2018}
}
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Figure 1: (a) PXRD patterns of SNO and different SNON-X. (b) PXRD patterns of CN and heterojunctions based on CN and SNO
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