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Title: Visible-light-active g-C 3 N 4 /N-doped Sr 2 Nb 2 O 7 heterojunctions as photocatalysts for the hydrogen evolution reaction

Abstract

Here, different visible-light-active g-C3N4/nitrogen-doped Sr2Nb2O7 heterojunction photocatalysts were fabricated by deposition of graphitic carbon nitride over N-doped strontium pyro-niobate prepared by ammonolysis at different temperatures of solvothermally synthesized Sr2Nb2O7 nanorods. Their photocatalytic performance was determined by the amount of hydrogen generated from water reduction under visible light irradiation. The best performing heterojunction was found to be the one formed by g-C3N4 and N-doped Sr2Nb2O7 obtained at 700°C. The enhanced activity of the heterojunction can be explained by better charge separation due to proper bands alignment and intimate contact between the heterojunction components as revealed by electron microscopy. A mechanism for the observed enhanced photocatalytic activity is proposed and supported by band position calculations and photoluminescence data.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [1]
  1. Department of Chemistry; Wake Forest University; Winston-Salem; USA; Center for Energy
  2. School of Chemistry and Biochemistry; Georgia Institute of Technology; Atlanta; USA; Center for Nanophase Materials Sciences
  3. School of Chemistry and Biochemistry; Georgia Institute of Technology; Atlanta; USA
  4. Center for Nanophase Materials Sciences; Oak Ridge National Laboratory; Oak Ridge; USA
  5. Department of Chemistry; Florida Agricultural and Mechanical University; Tallahassee; USA
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1468006
Alternate Identifier(s):
OSTI ID: 1471828
Grant/Contract Number:  
AC05-00OR22725; MRI 1040264; DGE-1650044
Resource Type:
Accepted Manuscript
Journal Name:
Sustainable Energy & Fuels
Additional Journal Information:
Journal Volume: 2; Journal Issue: 11; Journal ID: ISSN 2398-4902
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; g-C3N4; Heterojunction; Hydrogen; N-doping; Photocatalyst; Strontium niobate; 14 SOLAR ENERGY

Citation Formats

Adhikari, Shiba P., Hood, Zachary D., Chen, Vincent W., More, Karren L., Senevirathne, Keerthi, and Lachgar, Abdou. Visible-light-active g-C 3 N 4 /N-doped Sr 2 Nb 2 O 7 heterojunctions as photocatalysts for the hydrogen evolution reaction. United States: N. p., 2018. Web. doi:10.1039/C8SE00319J.
Adhikari, Shiba P., Hood, Zachary D., Chen, Vincent W., More, Karren L., Senevirathne, Keerthi, & Lachgar, Abdou. Visible-light-active g-C 3 N 4 /N-doped Sr 2 Nb 2 O 7 heterojunctions as photocatalysts for the hydrogen evolution reaction. United States. doi:10.1039/C8SE00319J.
Adhikari, Shiba P., Hood, Zachary D., Chen, Vincent W., More, Karren L., Senevirathne, Keerthi, and Lachgar, Abdou. Wed . "Visible-light-active g-C 3 N 4 /N-doped Sr 2 Nb 2 O 7 heterojunctions as photocatalysts for the hydrogen evolution reaction". United States. doi:10.1039/C8SE00319J. https://www.osti.gov/servlets/purl/1468006.
@article{osti_1468006,
title = {Visible-light-active g-C 3 N 4 /N-doped Sr 2 Nb 2 O 7 heterojunctions as photocatalysts for the hydrogen evolution reaction},
author = {Adhikari, Shiba P. and Hood, Zachary D. and Chen, Vincent W. and More, Karren L. and Senevirathne, Keerthi and Lachgar, Abdou},
abstractNote = {Here, different visible-light-active g-C3N4/nitrogen-doped Sr2Nb2O7 heterojunction photocatalysts were fabricated by deposition of graphitic carbon nitride over N-doped strontium pyro-niobate prepared by ammonolysis at different temperatures of solvothermally synthesized Sr2Nb2O7 nanorods. Their photocatalytic performance was determined by the amount of hydrogen generated from water reduction under visible light irradiation. The best performing heterojunction was found to be the one formed by g-C3N4 and N-doped Sr2Nb2O7 obtained at 700°C. The enhanced activity of the heterojunction can be explained by better charge separation due to proper bands alignment and intimate contact between the heterojunction components as revealed by electron microscopy. A mechanism for the observed enhanced photocatalytic activity is proposed and supported by band position calculations and photoluminescence data.},
doi = {10.1039/C8SE00319J},
journal = {Sustainable Energy & Fuels},
number = 11,
volume = 2,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 9 works
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Figures / Tables:

Figure 1 Figure 1: (a) PXRD patterns of SNO and different SNON-X. (b) The PXRD pattern of C3N4 and heterojunctions based on C3N4 and SNON-700 ( * represents the peaks due to oxynitride phase which appears as low as 800 °C).

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