Noble Metals on Anodic TiO<sub>2</sub> Nanotube Mouths: Thermal Dewetting of Minimal Pt Co‐Catalyst Loading Leads to Significantly Enhanced Photocatalytic H<sub>2</sub> Generation

Nguyen, Nhat Truong; Altomare, Marco; Yoo, JeongEun; Taccardi, Nicola; Schmuki, Patrik

doi:10.1002/aenm.201501926

Cited by 76 publications

(47 citation statements)

References 64 publications

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“…The decorated tubes were then annealed in air at 450 °C in order to fully convert the tubes and NPs into anatase. High‐resolution transmission electron microscopy (HR‐TEM) analysis also confirms that, after decoration, the TiO 2 NPs consist of anatase with a (101) lattice spacing of 3.48 Å (Figures f and 1 g) . The high‐resolution annular dark‐field (HAADF) image and elemental mappings in Figures h–k reveal that the NPs consist of TiO 2 .…”

Section: Figurementioning

confidence: 59%

“…High-resolution transmission electron microscopy (HR-TEM) analysis also confirmst hat, after decoration, the TiO 2 NPs consist of anatase with a( 101) lattice spacing of 3.48 (Figures 1fand 1g). [33] The high-resolution annular darkfield (HAADF) image and elemental mappings in Figures 1h-k reveal that the NPs consist of TiO 2 .F urthermore, fluoridei ons (from the anodization process) ands purious carbon remaino n the NT walls. It should be noted that it is particularly difficult to distinguish N(K a1 )a nd Ti(L a1 )b ecause of overlapping peaks.…”

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confidence: 92%

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Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

et al. 2018

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Regularly spaced TiO2 nanotubes were prepared by anodizing a titanium substrate in triethylene glycol electrolyte at elevated temperature. In comparison to conventional TiO2 nanotubes, spaced nanotubes possess an adjustable spacing between the individual nanotubes; this allows for controlled buildup of a hierarchical nanoparticle‐on‐nanotube structure. Here, we use this principle for layer‐by‐layer decoration of the tubes with TiO2 nanoparticles. The hierarchical structure after N doping and NH3 treatment at 450 °C shows a significant enhancement of visible‐light absorption, although it only carries a low doping concentration of nitrogen. For optimized N‐doped and particle‐decorated spaced TiO2 nanotubes, a considerable improvement in photocatalytic activity is obtained in comparison with conventional N‐doped TiO2 nanotubes or comparable N‐doped nanoparticle films. This is attributed to an enhanced visible‐light absorption through the N‐doped nanoparticle shell and a fast charge separation between the shell and the one‐dimensional nanotubular core.

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confidence: 59%

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confidence: 92%

Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

et al. 2018

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“…Conventionally this kinetic problem is tackled by decorating TiO 2 with suitable co‐catalysts (noble metals such as Pt, Pd, Au etc.) . These noble metal co‐catalysts act as charge transfer mediators for electron transfer from conduction band of TiO 2 to the electrolyte.…”

Section: Figurementioning

confidence: 99%

Electrochemically Faceted Bamboo‐type TiO₂ Nanotubes Provide Enhanced Open‐Circuit Hydrogen Evolution

Zhou

Schmuki

2018

ChemElectroChem

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In this paper we prepare facetted “black” TiO2 nanotube arrays (NTAs) with a bamboo‐type structure which exhibits an enhanced performance for open‐circuit H2 generation without the use of any noble metal co‐catalyst. The TiO2 nanotubes were formed by applying alternating positive and negative voltages. During the electrochemical formation, not only a bamboo structure is formed but the tubes are reduced in the cathodic cycle. After a rapid annealing treatment of these tubes in air at 500 °C for 10 s, the bamboo rings (knots) provide (001) facets preferentially located at the knot, while (101) planes prevail on the smooth part of tube between knots, as shown by TEM. The short annealing time keeps Ti3+/oxygen vacancies (VO) as co‐catalytically active centers still preserved in the TiO2 NTAs. The results of intensity modulated photocurrent spectroscopy (IMPS) and open‐circuit potential decay measurements (VOC) indicate that these faceted and reduced TiO2 nanotube arrays provide an efficient separation and reaction of photo‐generated charge carriers, leading to an improved photocatalytic H2 evolution performance.

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“…[30,31] The excited electrons from the conduction band of TiO 2 can be transferred to the plasmonic Pt for the following water splitting reaction. [32,33] In the present work, we designa nd in-situ photodeposite Pt nanoparticles on TiO 2 nanocube (TNCB) for the effective visible-light-driven H 2 evolution process. Pt NPs wered ecorated on TNCB under the ultraviolet light irradiation method.…”

Section: Introductionmentioning

confidence: 99%

In‐situ Platinum Plasmon Resonance Effect Prompt Titanium Dioxide Nanocube Photocatalytic Hydrogen Evolution

Qiao

et al. 2019

Chemistry An Asian Journal

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Herein, Pt‐decorated TiO2 nanocube hierarchy structure (Pt‐TNCB) was fabricated by a facile solvothermal synthesis and in‐situ photodeposition strategy. The Pt‐TNCB exhibits an excellent solar‐driven photocatalytic hydrogen evolution rate (337.84 μmol h−1), which is about 37 times higher than that of TNCB (9.19 μmol h−1). Interestingly, its photocatalytic property is still superior to TNCB with post modification Pt (1 wt %) (208.11 μmol h−1). The introduction of Pt efficiently extends the photoresponse of the composite material from UV to visible light region, simultaneously boosting their solar‐driven photocatalytic performance, which attribute to the porous structure, the sub size TNCB, the SPR effect of Pt NPs and strong interaction of two components. In fact, Pt NPs can enhance collective oscillations on delocalized electrons, which is conducive to capture electrons and hinder the recombination of photogenerated electron‐hole pairs, leading to the longer lifetime of photogenerated charges. The fabrication of Pt‐TNCB photocatalyst with SPR effect may provide a promising method to improve visible‐light photocatalytic activities for traditional photocatalysts.

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Noble Metals on Anodic TiO₂ Nanotube Mouths: Thermal Dewetting of Minimal Pt Co‐Catalyst Loading Leads to Significantly Enhanced Photocatalytic H₂ Generation

Cited by 76 publications

References 64 publications

Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

Electrochemically Faceted Bamboo‐type TiO₂ Nanotubes Provide Enhanced Open‐Circuit Hydrogen Evolution

In‐situ Platinum Plasmon Resonance Effect Prompt Titanium Dioxide Nanocube Photocatalytic Hydrogen Evolution

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Noble Metals on Anodic TiO2 Nanotube Mouths: Thermal Dewetting of Minimal Pt Co‐Catalyst Loading Leads to Significantly Enhanced Photocatalytic H2 Generation

Cited by 76 publications

References 64 publications

Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

Electrochemically Faceted Bamboo‐type TiO2 Nanotubes Provide Enhanced Open‐Circuit Hydrogen Evolution

In‐situ Platinum Plasmon Resonance Effect Prompt Titanium Dioxide Nanocube Photocatalytic Hydrogen Evolution

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Noble Metals on Anodic TiO₂ Nanotube Mouths: Thermal Dewetting of Minimal Pt Co‐Catalyst Loading Leads to Significantly Enhanced Photocatalytic H₂ Generation

Electrochemically Faceted Bamboo‐type TiO₂ Nanotubes Provide Enhanced Open‐Circuit Hydrogen Evolution