Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2022 Mar 31;12(7):1160.
doi: 10.3390/nano12071160.

MoSe2-WS2 Nanostructure for an Efficient Hydrogen Generation under White Light LED Irradiation

Tatiparti Padma  1 , Dheeraj Kumar Gara  2 , Amara Nadha Reddy  2 , Surya Veerendra Prabhakar Vattikuti  3 , Christian M Julien  4
Affiliations

MoSe2-WS2 Nanostructure for an Efficient Hydrogen Generation under White Light LED Irradiation

Tatiparti Padma et al. Nanomaterials (Basel). .

Abstract

In this work, MoSe2-WS2 nanocomposites consisting of WS2 nanoparticles covered with few MoSe2 nanosheets were successfully developed via an easy hydrothermal synthesis method. Their nanostructure and photocatalytic hydrogen evolution (PHE) performance are investigated by a series of characterization techniques. The PHE rate of MoSe2-WS2 is evaluated under the white light LED irradiation. Under LED illumination, the highest PHE of MoSe2-WS2 nanocomposite is 1600.2 µmol g-1 h-1. When compared with pristine WS2, the MoSe2-WS2 nanostructures demonstrated improved PHE rate, which is 10-fold higher than that of the pristine one. This work suggests that MoSe2-WS2 could be a promising photocatalyst candidate and might stimulate the further studies of other layered materials for energy conversion and storage.

Keywords: MoSe2; WS2; hydrogen production; layered materials; photocatalysts.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
XRD patterns of pristine WS2 and MoSe2, and nanostructured MoSe2-WS2 composite. Spectra were recorded using a CuKα X-ray source (λ = 1.5406 Å).
Figure 2
Figure 2
(a–c) TEM images of the MoSe2-WS2 nanocomposite, (d) HRTEM image, (e) HAADF-STEM pattern, and (f–i) corresponding elemental mapping images of W, S, Mo and Se.
Figure 3
Figure 3
XPS elemental profiles of (a) W, (b) Mo, (c) S, and (d) Se elements of the MoSe2-WS2 nanostructure.
Figure 4
Figure 4
FTIR spectra of WS2, MoSe2, and MoSe2-WS2 catalysts.
Figure 5
Figure 5
(a) BET profiles and (b) pore distribution of pristine WS2, MoSe2, and MoSe2-WS2 samples.
Figure 6
Figure 6
Determination of the bandgap of WS2, MoSe2 and MoSe2-WS2 catalysts. (a–c) UV-Vis transmittance spectra, (d–f) UV-Vis reflectance spectra and (g–i) Tauc’s plots.
Figure 7
Figure 7
(a) H2 generation rate of MoSe2, WS2, and MoSe2-WS2 catalysts and (b) continuous cycling stability of MoSe2-WS2 catalyst under visible light irradiation.
Figure 8
Figure 8
(a) Photocurrent response and (b) EIS spectra of WS2, MoSe2 and MoSe2-WS2 nanostructure.
Figure 9
Figure 9
Scheme of the photocatalytic mechanism of MoSe2-WS2 nanostructure under light irradiation.
See this image and copyright information in PMC

References

    1. Peng W., Li Y., Hang F., Zhang G., Fan X. Roles of two-dimensional transition metal dichalcogenides as cocatalysts in photocatalytic hydrogen evolution and environmental remediation. Ind. Eng. Chem. Res. 2017;56:4611–4626. doi: 10.1021/acs.iecr.7b00371. - DOI
    1. Wang F., Shifa T.A., Zhan X., Huang Y., Liu K., Cheng Z., Jiang C., He J. Recent advances in transition-metal dichalcogenide based nanomaterials for water splitting. Nanoscale. 2015;7:19764–19788. doi: 10.1039/C5NR06718A. - DOI - PubMed
    1. Voiry D., Yang J., Chhowalla M. Recent strategies for improving the catalytic activity of 2D TMD nanosheets toward the hydrogen evolution reaction. Adv. Mater. 2016;28:6197–6206. doi: 10.1002/adma.201505597. - DOI - PubMed
    1. Mishra A.K., Lakshmi K.V., Huang L. Eco-friendly synthesis of metal dichalcogenides nanosheets and their environmental remediation potential driven by visible light. Sci. Rep. 2015;5:15718. doi: 10.1038/srep15718. - DOI - PMC - PubMed
    1. Gopannagari M., Kumar D.P., Reddy D.A., Hong S., Song M.I., Kim T.K. In situ preparation of few-layered WS2 nanosheets and exfoliation into bilayers on CdS nanorods for ultrafast charge carrier migrations toward enhanced photocatalytic hydrogen production. J. Catalys. 2017;351:153–160. doi: 10.1016/j.jcat.2017.04.016. - DOI

LinkOut - more resources