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Title: Synergizing plasmonic Au nanocages with 2D MoS 2 nanosheets for significant enhancement in photocatalytic hydrogen evolution

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/D3TA01657A· OSTI ID:1992149
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [1]; ORCiD logo [5]; ORCiD logo [1]
  1. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  2. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA, Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634, USA
  3. Applied Materials Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, USA
  4. Department of Chemistry and Biochemistry, California State University Northridge, Northridge, California 91330, USA
  5. Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634, USA

Plasmonic enhancement of photocatalytic hydrogen evolution has been achieved under visible light illumination by integrating strongly plasmonic metal particles such as gold (Au) with semiconducting materials. To understand the effect of plasmon resonance on the photocatalytic hydrogen evolution reaction (HER), in this work, we study the hydrogen evolution reaction (HER) over Au nanocages with systematically tunable localized surface plasmon resonance (LSPR) properties dispersed on an Al2O3 support and covered with multiphasic 2D MoS2 nanosheets. It is interesting to observe that by tuning the LSPR wavelength of Au nanocages, an optimal enhancement in the photocatalytic HER can be obtained over the multiphasic 2D MoS2 nanosheets. In particular, when the LSPR wavelength of Au nanocages is close to the absorption edge of MoS2 nanosheets, a 40-fold increase is observed in the HER rate regarding bare MoS2. Time-resolved transient absorption spectroscopy was conducted to explicitly identify the mechanisms behind the Au/MoS2 system. The results suggest that near field enhancement (NFE) is the dominant LSPR process in this system and a detailed explanation of the working mechanism in this system is proposed. Governed by the NFE process, the energy of the surface plasma is transferred from Au nanocages to MoS2 nanosheets to promote electron–hole excitation in MoS2, and the efficiency reaches the maximum when the LSPR wavelength of Au nanocages matches the MoS2 light absorption edge, resulting in a significantly enhanced photocatalytic hydrogen yield compared to the bare MoS2 nanosheets and Au/MoS2 systems where the LSPR wavelengths of Au nanocages and MoS2 nanosheet absorption edge do not match. The learning from this work provides insights into the design of highly efficient photocatalysts based on plasmonic materials.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725
OSTI ID:
1992149
Alternate ID(s):
OSTI ID: 1994626
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Vol. 11 Journal Issue: 31; ISSN 2050-7488
Publisher:
Royal Society of Chemistry (RSC)Copyright Statement
Country of Publication:
United Kingdom
Language:
English

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