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Title: Semiconductor Heterojunctions for Enhanced Visible Light Photocatalytic H 2 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-C 3N 4), and UV light active, strontium pyroniobate, Sr 2Nb 2O 7. Heterojunctions made from a combination of g-C 3N 4 and nitrogen-doped Sr 2Nb 2O 7 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-C 3N 4 and N-doped Sr 2Nb 2O 7 at 700 °C (CN/SNON-700) showed better performance than heterojunction made from g-C 3N 4 and Sr 2Nb 2O 7 (CN/SNO). Finally, a plausible mechanism for the heterojunction enhanced photocatalytic activity is proposed based on, relative band positions, and photoluminescence data.

Authors:
 [1];  [2];  [1]
  1. Wake Forest Univ., Winston-Salem, NC (United States). Dept. of Chemistry. Center for Energy, Environment and Sustainability (CEES)
  2. 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. doi: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. doi: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 = {2018},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 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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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.