Size Dependent Plasmonic Effect on BiVO4 Photoanodes for Solar Water Splitting

被引:50
作者
Zhang, Liwu [1 ,2 ]
Herrmann, Lars O. [2 ]
Baumberg, Jeremy J. [2 ]
机构
[1] Fudan Univ, Dept Environm Sci & Engn, Shanghai Key Lab Atmospher Particle Pollut & Prev, Shanghai 200433, Peoples R China
[2] Univ Cambridge, Cavendish Lab, Dept Phys, Cambridge CB3 0HE, England
基金
英国工程与自然科学研究理事会;
关键词
NANOSTRUCTURED ALPHA-FE2O3; PHOTONIC CRYSTALS; OXYGEN EVOLUTION; PHOTOELECTRODES; ENHANCEMENT; OXIDE; PHOTOCATALYSTS; PHOTOOXIDATION; PERFORMANCE;
D O I
10.1038/srep16660
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Plasmonic nanostructures show great promise in enhancing the solar water splitting efficiency due to their ability to confine light to extremely small volumes inside semiconductors. While size plays a critical role in the plasmonic performance of Au nanoparticles (AuNPs), its influence on plasmonassisted water splitting is still not fully understood. This holds especially true for low band gap semiconductors, for which interband excitations occur in wavelength regions that overlap with plasmonic resonances. Here, BiVO4 films are modified with AuNPs of diameters varying from 10 to 80 nm to study the size dependence of the plasmonic effect. Plasmon resonance energy transfer (PRET) is found to be the dominant effect in enhancing the water splitting efficiency of BiVO4. "Hot electron" injection effect is weak in the case of BiVO4/AuNP. This is attributed to the interband excitation of BiVO4, which is unfavourable for the hot electrons accumulation in BiVO4 conduction band. The resonant scattering effect also contributes to the enhanced water splitting efficiency for the larger diameter AuNPs. It is also for the first time found that higher PRET effect can be achieved at larger off-normal irradiation angle.
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页数:12
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