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Electrochemical Fabrication of rGO-embedded Ag-TiO2 nanoring/nanotube Arrays for Plasmonic Solar Water Splitting

Nano-Micro Letters 2019年第4期11卷 674-689页

作者： Lixia Sang Lei Lei Clemens Burda Key Laboratory of Enhanced Heat Transfer and Energy Conservation Ministry of Education and Key Laboratory of Heat Transfer and Energy ConversionBeijing MunicipalityCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124People’s Republic of China Department of Chemistry Center for Chemical Dynamics and Nanomaterials ResearchCase Western Reserve University10900 Euclid AvenueClevelandOH 44106USA

Effective utilization of hot electrons generated from the decay of surface plasmon resonance in metal nanoparticles is conductive to improve solar water splitting ***,Ag nanoparticles and reduced graphene oxide(rGO)co-decorated hierarchical TiO2 nanoring/nanotube arrays(TiO2 R/T)were facilely fabricated by using two-step electrochemical anodization,electrodeposition,and photoreduction *** studies were conducted to elucidate the effects of rGO and Ag on the morphology,photoresponse,charge transfer,and photoelectric properties of ***,scanning electron microscope images confirm that the Ag nanoparticles adhered on TiO2 R/T and TiO2 R/T-rGO have similar diameter of 20 nm except for TiO2 R-rGO/***,the UV-Vis DRS and scatter spectra reveal that the optical property of the Ag-TiO2 R/T-rGO ternary composite is enhanced,ascribing to the visible light absorption of plasmonic Ag nanoparticles and the weakening effect of rGO on light ***,intensity-modulated photocurrent spectroscopy and photoluminescence spectra demonstrate that rGO can promote the hot electrons transfer from Ag nanoparticles to Ti substrate,reducing the photogenerated electron-hole ***,Ag-TiO2 R/T-rGO photoanode exhibits high photocurrent density(0.98 mA cm?2)and photovoltage(0.90 V),and the stable H2 evolution rate of 413μL h?1 cm?2 within 1.5 h under AM 1.5 which exceeds by 1.30 times than that of pristine TiO2 R/*** line with the above results,this work provides a reliable route synergizing rGO with plasmonic metal nanoparticles for photocatalysis,in which,rGO presents a broad absorption spectrum and effective photogenerated electrons transfer.

关键词： TiO2 nanoring/nanotube hierarchical structure Reduced graphene oxide Spectral responses Plasmonic Ag nanoparticles Water splitting

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