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Title: Monolayer Ti3C2Tx as an Effective Co-catalyst for Enhanced Photocatalytic Hydrogen Production over TiO2

Abstract

Titanium dioxide (TiO2) represents a promising candidate for hydrogen production via photocatalysis. Yet, its large bandgap and fast charge recombination limits its efficiency. To overcome this limitation, we explored in this work two-dimensional titanium carbide MXene, Ti3C2Tx (Tx = O, OH, F), as feasible co-catalysts for hydrogen production with TiO2 as the photocatalyst. We synthesized a series of Ti3C2Tx/TiO2 composite photocatalysts with monolayer Ti3C2Tx as the co-catalyst to improve the separation of photoinduced electrons and holes. The physicochemical properties of the Ti3C2Tx/TiO2 composites were investigated by a variety of characterization techniques, and the effect of the monolayer Ti3C2Tx on the photocatalytic performance of the Ti3C2Tx/TiO2 composites is elucidated by comparison to the multilayer counterpart. The photocatalytic hydrogen evolution rate of the optimized monolayer Ti3C2Tx/TiO2 composite is over 9 times higher than that of the pure TiO2 and 2.5 times higher than the multilayer counterpart. The significantly enhanced activity is attributed to the superior electrical conductivity of monolayer Ti3C2Tx and charge-carrier separation at the MXene/TiO2 interface. A mechanism of photocatalytic hydrogen evolution over the Ti3C2Tx/TiO2 system is proposed. Our work reports on the potential of monolayer MXenes as effective co-catalysts for photocatalysis and further broadens the applications of the MXene familymore » of two-dimensional materials.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [6];  [7]; ORCiD logo [5]
  1. Guangxi Univ., Nanning (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Tulane Univ., New Orleans, LA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); West Virginia Univ., Morgantown, WV (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Guangxi Univ., Nanning (China); Sun Yat-Sen Univ., Guangzhou, (China)
  7. Guangxi Univ., Nanning (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1545193
Grant/Contract Number:  
AC05-00OR22725; DGE-1650044
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Energy Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 7; Journal ID: ISSN 2574-0962
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; monolayer titanium carbide; MXene; titanium dioxide; photocatalysis; hydrogen evolution

Citation Formats

Su, Tongming, Hood, Zachary D., Naguib, Michael, Bai, Lei, Luo, Si, Rouleau, Christopher M., Ivanov, Ilia N., Ji, Hongbing, Qin, Zuzeng, and Wu, Zili. Monolayer Ti3C2Tx as an Effective Co-catalyst for Enhanced Photocatalytic Hydrogen Production over TiO2. United States: N. p., 2019. Web. doi:10.1021/acsaem.8b02268.
Su, Tongming, Hood, Zachary D., Naguib, Michael, Bai, Lei, Luo, Si, Rouleau, Christopher M., Ivanov, Ilia N., Ji, Hongbing, Qin, Zuzeng, & Wu, Zili. Monolayer Ti3C2Tx as an Effective Co-catalyst for Enhanced Photocatalytic Hydrogen Production over TiO2. United States. https://doi.org/10.1021/acsaem.8b02268
Su, Tongming, Hood, Zachary D., Naguib, Michael, Bai, Lei, Luo, Si, Rouleau, Christopher M., Ivanov, Ilia N., Ji, Hongbing, Qin, Zuzeng, and Wu, Zili. Fri . "Monolayer Ti3C2Tx as an Effective Co-catalyst for Enhanced Photocatalytic Hydrogen Production over TiO2". United States. https://doi.org/10.1021/acsaem.8b02268. https://www.osti.gov/servlets/purl/1545193.
@article{osti_1545193,
title = {Monolayer Ti3C2Tx as an Effective Co-catalyst for Enhanced Photocatalytic Hydrogen Production over TiO2},
author = {Su, Tongming and Hood, Zachary D. and Naguib, Michael and Bai, Lei and Luo, Si and Rouleau, Christopher M. and Ivanov, Ilia N. and Ji, Hongbing and Qin, Zuzeng and Wu, Zili},
abstractNote = {Titanium dioxide (TiO2) represents a promising candidate for hydrogen production via photocatalysis. Yet, its large bandgap and fast charge recombination limits its efficiency. To overcome this limitation, we explored in this work two-dimensional titanium carbide MXene, Ti3C2Tx (Tx = O, OH, F), as feasible co-catalysts for hydrogen production with TiO2 as the photocatalyst. We synthesized a series of Ti3C2Tx/TiO2 composite photocatalysts with monolayer Ti3C2Tx as the co-catalyst to improve the separation of photoinduced electrons and holes. The physicochemical properties of the Ti3C2Tx/TiO2 composites were investigated by a variety of characterization techniques, and the effect of the monolayer Ti3C2Tx on the photocatalytic performance of the Ti3C2Tx/TiO2 composites is elucidated by comparison to the multilayer counterpart. The photocatalytic hydrogen evolution rate of the optimized monolayer Ti3C2Tx/TiO2 composite is over 9 times higher than that of the pure TiO2 and 2.5 times higher than the multilayer counterpart. The significantly enhanced activity is attributed to the superior electrical conductivity of monolayer Ti3C2Tx and charge-carrier separation at the MXene/TiO2 interface. A mechanism of photocatalytic hydrogen evolution over the Ti3C2Tx/TiO2 system is proposed. Our work reports on the potential of monolayer MXenes as effective co-catalysts for photocatalysis and further broadens the applications of the MXene family of two-dimensional materials.},
doi = {10.1021/acsaem.8b02268},
journal = {ACS Applied Energy Materials},
number = 7,
volume = 2,
place = {United States},
year = {2019},
month = {5}
}

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Works referencing / citing this record:

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