期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 4, 页码 2096-2104出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp506349t
关键词
-
资金
- VENT project by NWO
- NWONANO project [11521]
The effect of plasmonic nanoparticles (NPs) on the photoelectrochemical water splitting performance of CuWO4 is studied here for the first time. CuWO4 thin films were functionalized with well-defined Au NPs in two composite configurations: with the NPs (I) at the CuWO4-electrolyte interface and (II) at the CuWO4 back contact. In both cases, the incident photon to current conversion efficiency of the film was increased (similar to 6-fold and similar to 1.2-fold for configurations I and II (at lambda = 390 nm), respectively). Two important advantages of placing the NPs on the CuWO4-electrolyte interface are identified: (1) Au NPs, coated with a 2 nm TiO2 layer, are found to significantly enhance the surface catalysis of the film, decreasing the surface charge recombination from similar to 60% to similar to 10%, and (2) the NPs near-field can promote additional charge carriers within the space charge layer region, where they undergo field-assisted transport, essentially avoiding recombination. Our study shows that Au NPs, coated with a 2 nm TiO2 layer, can significantly mitigate the catalytic and optical photoelectrochemical (PEC) limitations of CuWO4. An increase from 0.03 to 0.1 mA cm(-2) in the water-splitting photocurrent was measured for a 200 nm film under simulated solar irradiation at 1.23 V vs RHE.
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