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作者:

Sang, Lixia (Sang, Lixia.) (学者:桑丽霞) | Lei, Lei (Lei, Lei.) | Burda, Clemens (Burda, Clemens.)

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摘要:

HighlightsReduced graphene oxide (rGO) in electrode can weaken the light scattering of plasmonic Ag nanoparticles and promote the hot electrons transfer from Ag nanoparticles to Ti substrate.A route synergizing rGO with plasmonic Ag on TiO2 for plasmonic solar water splitting was provided. AbstractEffective utilization of hot electrons generated from the decay of surface plasmon resonance in metal nanoparticles is conductive to improve solar water splitting efficiency. Herein, 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 methods. Comparative studies were conducted to elucidate the effects of rGO and Ag on the morphology, photoresponse, charge transfer, and photoelectric properties of TiO2. Firstly, 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/T. Then, 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 scattering. Meanwhile, 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 recombination. Finally, Ag-TiO2 R/T-rGO photoanode exhibits high photocurrent density (0.98 mA cm(-2)) and photovoltage (0.90 V), and the stable H-2 evolution rate of 413 mu L h(-1) cm(-2) within 1.5 h under AM 1.5 which exceeds by 1.30 times than that of pristine TiO2 R/T. In 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:

Water splitting TiO2 nanoring Reduced graphene oxide nanotube hierarchical structure Plasmonic Ag nanoparticles Spectral responses

作者机构:

  • [ 1 ] [Sang, Lixia]Beijing Univ Technol, Minist Educ, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing 100124, Peoples R China
  • [ 2 ] [Lei, Lei]Beijing Univ Technol, Minist Educ, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing 100124, Peoples R China
  • [ 3 ] [Sang, Lixia]Beijing Univ Technol, Key Lab Heat Transfer & Energy Convers, Coll Environm & Energy Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Lei, Lei]Beijing Univ Technol, Key Lab Heat Transfer & Energy Convers, Coll Environm & Energy Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Burda, Clemens]Case Western Reserve Univ, Dept Chem, Ctr Chem Dynam & Nanomat Res, 10900 Euclid Ave, Cleveland, OH 44106 USA

通讯作者信息:

  • 桑丽霞

    [Sang, Lixia]Beijing Univ Technol, Minist Educ, Key Lab Enhanced Heat Transfer & Energy Conservat, Beijing 100124, Peoples R China;;[Sang, Lixia]Beijing Univ Technol, Key Lab Heat Transfer & Energy Convers, Coll Environm & Energy Engn, Beijing 100124, Peoples R China

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来源 :

NANO-MICRO LETTERS

ISSN: 2311-6706

年份: 2019

期: 1

卷: 11

2 6 . 6 0 0

JCR@2022

ESI学科: MATERIALS SCIENCE;

ESI高被引阀值:211

JCR分区:1

被引次数:

WoS核心集被引频次: 27

SCOPUS被引频次: 26

ESI高被引论文在榜: 0 展开所有

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