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Title: One-Step Synthesis of Nb 2O 5/C/Nb 2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

Hydrogen production through facile photocatalytic water splitting is regarded as a promising strategy to solve global energy problems. Transition-metal carbides (MXenes) have recently drawn attention as potential co-catalyst candidates for photocatalysts. In this paper, we report niobium pentoxide/carbon/niobium carbide (MXene) hybrid materials (Nb 2O 5/C/Nb 2C) as photocatalysts for hydrogen evolution from water splitting. The Nb 2O 5/C/Nb 2C composites were synthesized by one-step CO 2 oxidation of Nb 2CT x. Nb 2O 5 grew homogeneously on Nb 2C after mild oxidation, during which some amorphous carbon was also formed. With an optimized oxidation time of 1.0 h, Nb 2O 5/C/Nb 2C showed the highest hydrogen generation rate (7.81 μmol h -1 g cat -1), a value that was four times higher than that of pure Nb 2O 5. Finally, the enhanced performance of Nb 2O 5/C/Nb 2C was attributed to intimate contact between Nb 2O 5 and conductive Nb 2C and the separation of photogenerated charge carriers at the Nb 2O 5/Nb 2C interface; the results presented herein show that transition-metal carbide are promising co-catalysts for photocatalytic hydrogen production.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ; ORCiD logo [4] ; ORCiD logo [2] ; ORCiD logo [2] ;  [5] ;  [6] ; ORCiD logo [2]
  1. Guangxi University, Nanning (China). School of Chemistry and Chemical Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS); Univ. of Tennessee, Knoxville, TN (United States). Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS); Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  5. Guangxi University, Nanning (China). School of Chemistry and Chemical Engineering
  6. Univ. of Tennessee, Knoxville, TN (United States). Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Volume: 11; Journal Issue: 4; Journal ID: ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 08 HYDROGEN; carbides; hydrogen; niobium; photocatalysis; water splitting
OSTI Identifier:
1468082
Alternate Identifier(s):
OSTI ID: 1418419

Su, Tongming, Peng, Rui, Hood, Zachary D., Naguib, Michael, Ivanov, Ilia N., Keum, Jong Kahk, Qin, Zuzeng, Guo, Zhanhu, and Wu, Zili. One-Step Synthesis of Nb2O5/C/Nb2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution. United States: N. p., Web. doi:10.1002/cssc.201702317.
Su, Tongming, Peng, Rui, Hood, Zachary D., Naguib, Michael, Ivanov, Ilia N., Keum, Jong Kahk, Qin, Zuzeng, Guo, Zhanhu, & Wu, Zili. One-Step Synthesis of Nb2O5/C/Nb2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution. United States. doi:10.1002/cssc.201702317.
Su, Tongming, Peng, Rui, Hood, Zachary D., Naguib, Michael, Ivanov, Ilia N., Keum, Jong Kahk, Qin, Zuzeng, Guo, Zhanhu, and Wu, Zili. 2017. "One-Step Synthesis of Nb2O5/C/Nb2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution". United States. doi:10.1002/cssc.201702317.
@article{osti_1468082,
title = {One-Step Synthesis of Nb2O5/C/Nb2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution},
author = {Su, Tongming and Peng, Rui and Hood, Zachary D. and Naguib, Michael and Ivanov, Ilia N. and Keum, Jong Kahk and Qin, Zuzeng and Guo, Zhanhu and Wu, Zili},
abstractNote = {Hydrogen production through facile photocatalytic water splitting is regarded as a promising strategy to solve global energy problems. Transition-metal carbides (MXenes) have recently drawn attention as potential co-catalyst candidates for photocatalysts. In this paper, we report niobium pentoxide/carbon/niobium carbide (MXene) hybrid materials (Nb2O5/C/Nb2C) as photocatalysts for hydrogen evolution from water splitting. The Nb2O5/C/Nb2C composites were synthesized by one-step CO2 oxidation of Nb2CTx. Nb2O5 grew homogeneously on Nb2C after mild oxidation, during which some amorphous carbon was also formed. With an optimized oxidation time of 1.0 h, Nb2O5/C/Nb2C showed the highest hydrogen generation rate (7.81 μmol h-1 gcat-1), a value that was four times higher than that of pure Nb2O5. Finally, the enhanced performance of Nb2O5/C/Nb2C was attributed to intimate contact between Nb2O5 and conductive Nb2C and the separation of photogenerated charge carriers at the Nb2O5/Nb2C interface; the results presented herein show that transition-metal carbide are promising co-catalysts for photocatalytic hydrogen production.},
doi = {10.1002/cssc.201702317},
journal = {ChemSusChem},
number = 4,
volume = 11,
place = {United States},
year = {2017},
month = {12}
}