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This content will become publicly available on April 17, 2019

Title: Semiconductor Heterojunctions for Enhanced Visible Light Photocatalytic H 2 Production

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.
 [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:
Grant/Contract Number:
AC05-00OR22725; DGE-1650044
Accepted Manuscript
Journal Name:
MRS Advances
Additional Journal Information:
Journal Name: MRS Advances; Journal ID: ISSN 2059-8521
Materials Research Society (MRS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Wake Forest Univ., Winston-Salem, NC (United States)
Sponsoring Org:
USDOE; Wake Forest Univ. (United States); National Science Foundation (NSF)
Country of Publication:
United States
energy generation; heterogenous; photochemical
OSTI Identifier: