Site-selective deposition of binary Pt–Pb alloy nanoparticles on TiO2 nanorod for acetic acid oxidative decomposition

Tanabe, T.; Wataru, Miyazawa; Gunji, Takao; Hashimoto, Masanari; Kaneko, Shingo; Nozawa, Toshiaki; Miyauchi, Mutsumi; Matsumoto, Futoshi

doi:10.1016/j.jcat.2016.05.027

Cited by 21 publications

(9 citation statements)

References 35 publications

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“…Platinum (Pt)-loaded TiO 2 nanorods or TiO 2 -800 were prepared similarly as reported in the literature. 24 Instead of hygroscopic H 2 PtCl 6 •6H 2 O powder, commercially available aqueous hydrogen hexachloroplatinate(IV) solution (1000 mg-Pt L −1 , 6.0 mL) was poured into aqueous methanol (804 mL, 4.6 mol L −1 ) containing 0.6 g of TiO 2 nanorods or TiO 2 -800. Dissolved O 2 was removed by bubbling argon gas for 1 h, and then the suspension was irradiated for 3 h with UV irradiation.…”

Section: ■ Introductionmentioning

confidence: 99%

Developing Active TiO₂ Nanorods by Examining the Influence of Morphological Changes from Nanorods to Nanoparticles on Photocatalytic Activity

Yamazaki

Azami

Katoh

et al. 2018

ACS Appl. Nano Mater.

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We synthesized rutile TiO 2 nanorods with high crystallinity, i.e., degree of crystallinity greater than ca. 90%, by using a hydrothermal method and studied the effect of the morphological change from rod shape to subsphere by the subsequent thermal treatment. The photocatalytic activity was estimated for O 2 evolution from water oxidation because this reaction was hardly affected by the specific surface area of photocatalysts. Thermal desorption and gas chromatography− mass spectrometry measurements suggested the decomposition of residual glycolic acid in TiO 2 nanorods at 272 and 590 °C. Observation with scanning electron microscopy and physical properties such as specific surface area and crystallite size indicated deformation of the rod shape to subsphere by the calcination above 600 °C. Time-resolved microwave conductivity measurements have revealed that the TiO 2 nanorods possess the longest lifetime of photogenerated electrons among all samples. However, the O 2 evolution rate of the TiO 2 nanorods was much lower than subsphere TiO 2 obtained by calcination at 800 °C (TiO 2 -800). Photodeposition of Pt and PbO 2 showed that the oxidation and the reduction sites were separated on TiO 2 -800 whereas their deposition distributed uniformly on the TiO 2 nanorods. The Pt loading on the surface of the TiO 2 nanorods increased the O 2 evolution rate whereas that on TiO 2 -800 was hardly affected, indicating that the Pt loading enhances the charge separation on the surface of the TiO 2 nanorods. Therefore, the lower photocatalytic activity of the TiO 2 nanorods is ascribed to the recombination process on the surface. The suppression of the recombination on the surface and thereby the utilization of the long lifetime of the photogenerated electrons is the key factor to develop superior TiO 2 nanorods for photocatalysis.

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Section: ■ Introductionmentioning

confidence: 99%

Developing Active TiO₂ Nanorods by Examining the Influence of Morphological Changes from Nanorods to Nanoparticles on Photocatalytic Activity

Yamazaki

Azami

Katoh

et al. 2018

ACS Appl. Nano Mater.

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“…[9][10][11][12][13][14][15] It has been reported that selective deposition of suitable dual-cocatalysts (oxidation cocatalysts and reduction cocatalysts) on corresponding sites of semiconductor-based crystals (e.g., BiVO 4 , TiO 2 , SrTiO 3 , PbTiO 3 ) resulted in a remarkable enhanced photocatalytic performance due to the spatial separation of the photogenerated charges between different facets and the synergetic effect of dual-cocatalysts deposited onto the needed facets. 13,[16][17][18][19][20][21][22] Our recent research works revealed that the square-like WO 3 nanoplates with Pt loaded mainly on dominant facets shows higher photocatalytic activity than that with Pt loaded on the edged facets due to light-induced charge separation between different facets of square-like WO 3. 23 However, the activity difference is not very big owe to that platinum particles were not effective oxidation reaction promoters for promoting O 2 evolution on the dominant (002) facets of square-like WO 3 .…”

Section: Introductionmentioning

confidence: 99%

The synergetic effect of dual co-catalysts on the photocatalytic activity of square-like WO₃with different exposed facets

et al. 2017

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Here we report the controlled selective deposition of Pt and PbO x dual-cocatalysts on the edged (200) and (020) facets and the main (002) facets of square-like WO 3 nanoplates, respectively. The remarkably enhanced photocatalytic activities were observed for such assembled photocatalysts in photocatalytic water oxidation. The superior performance can be attributed to not only the light-induced preferential flow of photogenerated electrons and holes onto different facets of the square-like WO 3 , thus leading to the reduction and oxidation reactions taking place on the corresponding edged and major top facets, but also the selective deposition of suitable oxidation and reduction cocatalysts onto the needed facets of square-like WO 3 to reduce the charge recombination and catalyze the redox reactions. These findings will be promising and intriguing for designing high efficiency WO 3 system for visible light water splitting.

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“…Both τ 1 and τ 2 values are in the following order: GA S‑800 > LA R‑800 > GA Rod . In TiO 2 photocatalysis, the deposition of Pt or PbO 2 gives information on whether the exposed crystal facets act as reductive or oxidative sites. − Photogenerated electrons and holes are transferred to reductive and oxidative sites, respectively, due to a built-in electric field to suppress the recombination. Previously, we demonstrated that the crystal facets for oxidation and reduction were spatially separated on Sol–gel Sphere and GA S‑800 but Pt and PbO 2 were distributed homogeneously over the entire surface of GA Rod .…”

Section: Resultsmentioning

confidence: 99%

One-Pot Synthesis of Long Rutile TiO₂ Nanorods and Their Photocatalytic Activity for O₂ Evolution: Comparison with Near-Spherical Nanoparticles

et al. 2021

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Rutile TiO 2 nanorods with lengths greater than 600 nm and aspect ratios greater than ca. 16 were synthesized through a one-pot hydrothermal method using lactic acid (LA) as a structuredirecting agent. Under the hydrothermal treatment at 200 °C, the LA concentration higher than 1.6 mol dm −3 and the hydrothermal time of 72 h were needed to obtain 100% rutile nanorods. The length and the width of the nanorods increased with the increasing LA concentration. The photocatalytic activity of the synthesized nanorods was evaluated for the oxygen evolution in aqueous AgNO 3 solutions under ultraviolet irradiation. Calcination of the synthesized nanorods at 400 °C was required to decompose residual organic compounds on the surface and improve the oxygen evolution. The highest oxygen evolution rate was obtained with the nanorods after being calcined at 800 °C. It is worth noting that the nanorods retained their shape (aspect ratio of 8.8) at 800 °C. Selected area electron diffraction patterns indicated that the side or the end surface of the nanorods was attributable to the {110} or {111} facet, respectively. Deposition of Pt or PbO 2 on the nanorods revealed that the {110} or {111} facet acted as reductive or oxidative sites. For comparison, near-spherical TiO 2 nanoparticles were synthesized by a sol−gel method. Furthermore, using glycolic acid as the structure-directing agent, we synthesized small rutile TiO 2 nanorods (aspect ratio of 9) and changed the shape to near-spherical (aspect ratio of 1.3) by calcining at 800 °C. Time-resolved diffuse reflectance spectra were measured to determine the lifetime of the photogenerated electrons. The photocatalytic activity of the nanorods was much lower than that of the near-spherical TiO 2 nanoparticles. However, the nanorods synthesized with LA are useful as catalyst support or platforms for various applications because of their unique morphology and high heat resistance.

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Site-selective deposition of binary Pt–Pb alloy nanoparticles on TiO2 nanorod for acetic acid oxidative decomposition

Cited by 21 publications

References 35 publications

Developing Active TiO₂ Nanorods by Examining the Influence of Morphological Changes from Nanorods to Nanoparticles on Photocatalytic Activity

Developing Active TiO₂ Nanorods by Examining the Influence of Morphological Changes from Nanorods to Nanoparticles on Photocatalytic Activity

The synergetic effect of dual co-catalysts on the photocatalytic activity of square-like WO₃with different exposed facets

One-Pot Synthesis of Long Rutile TiO₂ Nanorods and Their Photocatalytic Activity for O₂ Evolution: Comparison with Near-Spherical Nanoparticles

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Site-selective deposition of binary Pt–Pb alloy nanoparticles on TiO2 nanorod for acetic acid oxidative decomposition

Cited by 21 publications

References 35 publications

Developing Active TiO2 Nanorods by Examining the Influence of Morphological Changes from Nanorods to Nanoparticles on Photocatalytic Activity

Developing Active TiO2 Nanorods by Examining the Influence of Morphological Changes from Nanorods to Nanoparticles on Photocatalytic Activity

The synergetic effect of dual co-catalysts on the photocatalytic activity of square-like WO3with different exposed facets

One-Pot Synthesis of Long Rutile TiO2 Nanorods and Their Photocatalytic Activity for O2 Evolution: Comparison with Near-Spherical Nanoparticles

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Developing Active TiO₂ Nanorods by Examining the Influence of Morphological Changes from Nanorods to Nanoparticles on Photocatalytic Activity

Developing Active TiO₂ Nanorods by Examining the Influence of Morphological Changes from Nanorods to Nanoparticles on Photocatalytic Activity

The synergetic effect of dual co-catalysts on the photocatalytic activity of square-like WO₃with different exposed facets

One-Pot Synthesis of Long Rutile TiO₂ Nanorods and Their Photocatalytic Activity for O₂ Evolution: Comparison with Near-Spherical Nanoparticles