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Highly Durable N-Doped Graphene/CdS Nanocomposites with Enhanced Photocatalytic Hydrogen Evolution from Water under Visible Light Irradiation
Abstract
A series of N-doped graphene ( N -graphene)/CdS nanocomposites were synthesized by calcination and characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy, N 2 adsorption analysis, ultraviolet–visible diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activity of as-prepared N -graphene/CdS for hydrogen production from water under visible light irradiation at λ ≥ 420 nm was investigated. The results show that N -graphene/CdS nanocomposites have a higher photocatalytic activity than pure CdS. Transient photocurrents measured with a photoelectrochemical test device show that the photocurrent of the N -graphene/CdS sample is much increased as compared to the sole CdS. This enhanced photoresponse indicates that the photoinduced electrons in the CdS prefer separately transferring to the N-doped graphene. As a consequence, the radiative recombination of the electron–hole pairs is hampered and the photocatalytic activity is significantly enhanced for the N -graphene/CdS photocatalysts. The amount of N -graphene is an important factor affecting photocatalytic activity of N -graphene/CdS nanocomposites; the optimum amount of N -graphene is ca. 2 wt %, at which the N -graphene/CdS sample displays the highest reactivity. Photocatalytic activity of graphene/CdS and GO/CdS composites for H 2 production from water under visible light irradiation was also measured. The relative order of reactivity for the synthesized catalysts was found to be N -graphene/CdS > graphene/CdS > GO/CdS > CdS. Furthermore, the N -graphene/CdS photocatalyst does not show deactivation for H 2 evolution for longer than 30 h, indicating that the cocatalyst of N -graphene as a protective layer can prevent CdS from photocorrosion under light irradiation. Our findings demonstrate that N -graphene as a cocatalyst is a more promising candidate for development of high-performance photocatalysts in the photocatalytic H 2 production.
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Cites
Geim, A. K., & Novoselov, K. S. (2007) · Nature Materials · doi:10.1038/nmat1849 · Cited by 39,979
Cited by
Wang, H., Maiyalagan, T., & Wang, X. (2012) · ACS Catalysis · doi:10.1021/cs200652y · Cited by 3,618
Graphene-based semiconductor photocatalysts
Xiang, Q., Yu, J., & Jaroniec, M. (2012) · Chem. Soc. Rev. · doi:10.1039/c1cs15172j · Cited by 2,730
Zhang, J., Yu, J., Jaroniec, M., & Gong, J. R. (2012) · Nano Letters · doi:10.1021/nl301831h · Cited by 894
Photocatalytic Cr(VI) reduction in metal-organic frameworks: A mini-review
Wang, C.-C., Du, X.-D., Li, J., Guo, X.-X., Wang, P., & Zhang, J. (2016) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2016.04.030 · Cited by 659
Kofuji, Y., Isobe, Y., Shiraishi, Y., Sakamoto, H., Tanaka, S., Ichikawa, S., & Hirai, T. (2016) · Journal of the American Chemical Society · doi:10.1021/jacs.6b05806 · Cited by 587
Metadata
- Authors
- Jia, L., Wang, D.-H., Huang, Y.-X., Xu, A.-W., & Yu, H.-Q.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-05-24
- Volume
- 115
- Issue
- 23
- Pages
- 11466-11473
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2314821985
- Cited by
- 577
- References
- 1
- FWCI
- 23.77
- Type
- journal article
- Language
- en
- Open access
- closed
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