Modulating the interaction between gold and TiO2 nanowires for enhanced solar driven photoelectrocatalytic hydrogen generation
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Altres documents de l'autoria: Sudhagar, P.; Song, Taeseup; Devadoss, Anitha; Lee, Jung Woo; Haro, Marta; Terashima, Chiaki; Lysak, Volodymyr V.; Bisquert, Juan; Fujishima, Akira; Gimenez, Sixto; Paik, Ungyu
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
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Modulating the interaction between gold and TiO2 nanowires for enhanced solar driven photoelectrocatalytic hydrogen generationAutoria
Data de publicació
2015Editor
Royal Society of ChemistryISSN
1463-9084; 1463-9076Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.rsc.org/en/content/articlelanding/2015/cp/c5cp01175b#!divAbstractVersió
info:eu-repo/semantics/acceptedVersionParaules clau / Matèries
Resum
The interaction strength of Au nanoparticles with pristine and nitrogen doped TiO2 nanowire surfaces was
analysed using density functional theory and their significance in enhancing the solar driven photoelectrocat ... [+]
The interaction strength of Au nanoparticles with pristine and nitrogen doped TiO2 nanowire surfaces was
analysed using density functional theory and their significance in enhancing the solar driven photoelectrocatalytic
properties was elucidated. In this article, we prepared 4-dimethylaminopyridine capped Au
nanoparticle decorated TiO2 nanowire systems. The density functional theory calculations show {101}
facets of TiO2 as the preferred phase for dimethylaminopyridine–Au nanoparticles anchoring with a binding
energy of 8.282 kcal mol1
. Besides, the interaction strength of Au nanoparticles was enhanced
nearly four-fold (35.559 kcal mol1
) at {101} facets via nitrogen doping, which indeed amplified the Au
nanoparticle density on nitrided TiO2. The Au coated nitrogen doped TiO2 (N–TiO2–Au) hybrid electrodes
show higher absorbance owing to the light scattering effect of Au nanoparticles. In addition, N–TiO2–Au
hybrid electrodes block the charge leakage from the electrode to the electrolyte and thus reduce the
charge recombination at the electrode/electrolyte interface. Despite the beneficial band narrowing effect
of nitrogen in TiO2 on the electrochemical and visible light activity in N–TiO2–Au hybrid electrodes, it
results in low photocurrent generation at higher Au NP loading (3.4 107 M) due to light blocking the
N–TiO2 surface. Strikingly, even with a ten-fold lower Au NP loading (0.34 107 M), the synergistic effects
of nitrogen doping and Au NPs on the N–TiO2–Au hybrid system yield high photocurrent compared to
TiO2 and TiO2–Au electrodes. As a result, the N–TiO2–Au electrode produces nearly 270 mmol h1 cm2
hydrogen, which is nearly two-fold higher than the pristine TiO2 counterpart. The implications of these
findings for the design of efficient hybrid photoelectrocatalytic electrodes are discussed.
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Phys. Chem. Chem. Phys., 2015, 17, 19371Drets d'accés
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