4.8 Article

Graphene bridge in transferring hot electrons from plasmonic Ag nanocubes to TiO2 nanosheets for enhanced visible light photocatalytic hydrogen evolution

期刊

APPLIED CATALYSIS B-ENVIRONMENTAL
卷 220, 期 -, 页码 182-190

出版社

ELSEVIER
DOI: 10.1016/j.apcatb.2017.08.045

关键词

Graphene; Plasmonics; Semiconductor; Photocatalysis; Hydrogen evolution

资金

  1. National Natural Science Foundation of China [21603191]
  2. Zhejiang Provincial Natural Science Foundation of China [LQ168010001]
  3. Public Welfare Technology Application Research Plan Project of Zhejiang Province (Analysis Test Item) [2017C37024]
  4. Project of Science and Technology Innovation Program of University Students in Zhejiang Province [2017R404066]

向作者/读者索取更多资源

The integration of plasmonic metal with wide-bandgap semiconductor is a promising approach to utilize the visible light without compromise of the redox ability of photogenerated charge carriers. However, a larger work function of metal than that of semiconductor is indispensable to enable the injection of hot electrons from plasmonic metal to semiconductor. In this paper, we demonstrated that reduced graphene oxide (rGO) nanosheets as conductive bridge can breakthrough the restriction and transfer hot electrons from Ag of smaller work function to TiO2 of larger work function. In the design, both of the Ag nanocubes and TiO2 nanosheets are co-deposited on the surface of rGO nanosheets to form Ag-rGO-TiO2 structure, which was characterized by XRD, TEM, Raman and XPS spectra. On one hand, the Ag-rGO interface facilitates the transfer of hot electrons from Ag to rGO through conductor conductor contact. On the other hand, the new formed Schottky junction on the rGO-TiO2 interface further pumps the transferred electrons to the surface of TiO2 for photocatalytic reduction reaction resulted from the larger work function of rGO than that of TiO2. Enabled by this unique design, the hydrogen production activity achieved under visible light irradiation is dramatically enhanced in comparison with that of Ag-TiO2 counterpart with the direct contact between the same Ag nanocubes and TiO2 nanosheets. This work represents a step toward the rational interfacial design of plasmonic metal-semiconductor hybrid structures for broad-spectrum photocatalysis.

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