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Semiconductor Heterojunctions for Enhanced Visible Light Photocatalytic H2 Production

Published online by Cambridge University Press:  17 April 2018

Shiba P. Adhikari ,
Zachary D. Hood  and
Abdou Lachgar
Shiba P. Adhikari*
Affiliation:
Department of Chemistry, Wake Forest University, Winston-Salem, NC 27109, USA Center for Energy, Environment and Sustainability (CEES), Wake Forest University, Winston-Salem, NC27109
Zachary D. Hood
Affiliation:
Center for Energy, Environment and Sustainability (CEES), Wake Forest University, Winston-Salem, NC27109 School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA30332, USA
Abdou Lachgar*
Affiliation:
Department of Chemistry, Wake Forest University, Winston-Salem, NC 27109, USA Center for Energy, Environment and Sustainability (CEES), Wake Forest University, Winston-Salem, NC27109
*
*Corresponding author email: adhikarisp@ornl.gov; lachgar@wfu.edu
*Corresponding author email: adhikarisp@ornl.gov; lachgar@wfu.edu
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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 paper, 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). A plausible mechanism for the heterojunction enhanced photocatalytic activity is proposed based on, relative band positions, and photoluminescence data.

Keywords

energy generationheterogenousphotochemical
Type
Articles
Information
MRS Advances , Volume 3 , Issue 55: Energy Materials and Technologies , 2018 , pp. 3263 - 3270
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

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Current Address: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge TN 37831, USA

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Current Address: Electrochemical Materials Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

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