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Title: One-Step Synthesis of Nb2O5/C/Nb2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution

Journal Article · · ChemSusChem
 [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

Abstract 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. Here, we report niobium pentoxide/carbon/niobium carbide (MXene) hybrid materials (Nb 2 O 5 /C/Nb 2 C) as photocatalysts for hydrogen evolution from water splitting. The Nb 2 O 5 /C/Nb 2 C composites were synthesized by one‐step CO 2 oxidation of Nb 2 CT x . Nb 2 O 5 grew homogeneously on Nb 2 C after mild oxidation, during which some amorphous carbon was also formed. With an optimized oxidation time of 1.0 h, Nb 2 O 5 /C/Nb 2 C 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 2 O 5 . The enhanced performance of Nb 2 O 5 /C/Nb 2 C was attributed to intimate contact between Nb 2 O 5 and conductive Nb 2 C and the separation of photogenerated charge carriers at the Nb 2 O 5 /Nb 2 C interface; the results presented herein show that transition‐metal carbide are promising co‐catalysts for photocatalytic hydrogen production.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1468082
Alternate ID(s):
OSTI ID: 1418419
Journal Information:
ChemSusChem, Vol. 11, Issue 4; ISSN 1864-5631
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 244 works
Citation information provided by
Web of Science

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MXene‐Based Composites: Synthesis and Applications in Rechargeable Batteries and Supercapacitors journal February 2019
The Rise of 2D Photothermal Materials beyond Graphene for Clean Water Production journal January 2020
Harmonic Mode‐Locked Er‐Doped Fiber Laser by Evanescent Field‐Based MXene Ti 3 C 2 T x (T = F, O, or OH) Saturable Absorber journal December 2019
Water Splitting Performance Enhancement of the TiO 2 Nanorod Array Electrode with Ultrathin Black Phosphorus Nanosheets journal November 2019
Bi-, Y-Codoped TiO2 for Carbon Dioxide Photocatalytic Reduction to Formic Acid under Visible Light Irradiation: Bi-, Y-Codoped TiO2 for Carbon Dioxide Photocatalytic Reduction to Formic Acid under Visible Light Irradiation journal April 2018
Boosting the Photocatalytic Activity of P25 for Carbon Dioxide Reduction by using a Surface-Alkalinized Titanium Carbide MXene as Cocatalyst journal March 2018
Two‐Dimensional Transition Metal Carbides and Nitrides (MXenes): Synthesis, Properties, and Electrochemical Energy Storage Applications journal March 2020
g‐C 3 N 4 /BiYO 3 Composite for Photocatalytic Hydrogen Evolution journal June 2018
Fabrication of Amorphous BiOCl/TiO 2 ‐C 3 N 4 Heterostructure for Efficient Water Oxidation journal July 2019
Strongly Coupled Amorphous Porous NbO x (OH) y /g‐C 3 N 4 Heterostructure Composite for Efficient Photocatalytic Hydrogen Evolution journal December 2019
Hybrid Charge‐Storage Route to Nb 2 CT x MXene as Anode for Sodium‐Ion Batteries journal January 2020
Review of MXenes as new nanomaterials for energy storage/delivery and selected environmental applications journal October 2018
2D MXenes as Co-catalysts in Photocatalysis: Synthetic Methods journal September 2019
The synergetic effects of Ti 3 C 2 MXene and Pt as co-catalysts for highly efficient photocatalytic hydrogen evolution over g-C 3 N 4 journal January 2018
g-C 3 N 4 /Ti 3 C 2 T x (MXenes) composite with oxidized surface groups for efficient photocatalytic hydrogen evolution journal January 2018
Boosting photocatalytic water splitting by tuning built-in electric field at phase junction journal January 2019
2D/2D heterojunction of Ti 3 C 2 /g-C 3 N 4 nanosheets for enhanced photocatalytic hydrogen evolution journal January 2019
Fluorine substitution enabling pseudocapacitive intercalation of sodium ions in niobium oxyfluoride journal January 2019
Electronic and optical characterization of 2D Ti 2 C and Nb 2 C (MXene) thin films journal February 2019
An overview of photocatalysis facilitated by 2D heterojunctions journal September 2019
2D/2D Heterojunction of R-scheme Ti3C2 MXene/MoS2 Nanosheets for Enhanced Photocatalytic Performance journal April 2020