Shape-selective formation and characterization of catalytically active iridium nanoparticles

Kundu, Subrata; Liang, Hong

doi:10.1016/j.jcis.2010.11.032

Cited by 69 publications

(36 citation statements)

References 57 publications

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“…[19] Due to the limited choice of suitable reducers, NaBH 4 has become popular in the synthesis of Ir NP dispersions and agglomerates (sponges). [13][14][15][16]68] A possible mechanism for the anodic oxidation of NaBH 4 in the presence of a metal catalyst is given by van den Meerakker. [58] Briefly, at the metal surface, the hydride ligands of the borohydride anions are successively oxidized and replaced by OH À .…”

Section: Development Of Ir Nanoplating Solutionsmentioning

confidence: 99%

“…[11,12] Ir nanoparticles (NPs) and thin-films are of particular interest for these catalytic applications since their increased surface-to-volume ratio allows for a more efficient noble metal utilization. [7] While dispersed Ir NPs are often prepared by wet-chemical methods, [13][14][15][16] Ir thin films can be deposited by various techniques including electroplating, [9,[17][18][19] pulsed laser deposition, [20,21] chemical vapor deposition [22] and atomic layer deposition (ALD). [5,23,24] Other synthesis routes rely on drying Ir NP dispersions on solid substrates [10,14] or the utilization of reductive substrates such as porous carbon.…”

Section: Introductionmentioning

confidence: 99%

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Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

et al. 2020

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Electroless plating is a powerful tool in nanofabrication and is available for many of the noble transition metals. There is, however, a striking lack of electroless plating procedures for the rarer platinum‐group metals. In this work, two plating baths for nanoscale iridium coatings are developed and their conformality and nanofabrication potential are showcased by coating ion‐track‐etched polycarbonate membranes, creating Ir nanotubes in the process. Both plating solutions yield morphologically different deposits, indicating that the microstructure of the film can be tuned by adjusting the composition of the plating bath. The catalytic performance of the deposited materials is investigated by using membrane‐embedded nanotubes as catalysts for the reduction of 4‐nitrophenol and methyl orange by borohydride, showing remarkable activity and stability. Operation in flow‐through configuration, in which the metallized membrane is implemented as a microreactor greatly enhances the interaction with the catalyst surface, considerably increasing product yield. The results highlight the potential of Ir nanoplating for realizing sophisticated nanostructures and heterogeneous catalysts, but also illustrate the intricacies related to the complex chemistry of electroless Ir plating baths.

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Section: Development Of Ir Nanoplating Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

et al. 2020

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“…The leaf extracts from various plants including Solanum trilobatum (Kanchana et al, 2010), Anacardium occidentale (Sheny et al, 2012), Catharanthus roseus (Kalaiselvi et al, 2015) were also utilized for the production of palladium nanoparticles. The catalytic activity of various metallic nanoparticles such as silver (Bindhu and Umadevi, 2015;Kundu, 2013;Narayanan et al, 2013), gold (Maity et al, 2012;Narayanan and Sakthivel, 2011;Praharaj et al, 2004;Sen et al, 2013), palladium (Dauthal and Mukhopadhyay, 2013;Kalaiselvi et al, 2015;Santoshi kumari et al, 2015), platinum (Coccia et al, 2012) and iridium (Kundu and Liang, 2011) was widely studied in reduction of various dyes.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of palladium nanoparticles using gum ghatti (Anogeissus latifolia) and its application as an antioxidant and catalyst

Kora

Rastogi

2018

Arabian Journal of Chemistry

186

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A facile and green route for the synthesis of palladium nanoparticles from palladium chloride was developed using non-toxic, renewable plant polymer, gum ghatti (Anogeissus latifolia), as both the reducing and stabilizing agent. The generated nanoparticles were characterized with UV-visible spectroscopy (UV-vis), dynamic light scattering (DLS), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The formation of palladium nanoparticles was confirmed from the appearance of intense brown colour and broad continuous absorption spectra in the UV-visible region. The produced nanoparticles were found to be spherical in shape, polydisperse and the average particle size was 4.8 ± 1.6 nm. The face centred cubic crystal structure of the fabricated nanoparticles is confirmed from the selected-area electron diffraction and XRD patterns. Compared to earlier reports, the nanoparticles showed superior antioxidant at a much lower nanoparticle dose. Also, the homogenous catalytic activity of palladium nanoparticles was studied by probing the reduction of dyes such as coomassie brilliant blue G-250, methylene blue, methyl orange, and a nitro compound, 4-nitrophenol with sodium borohydride. The nanoparticles exhibited excellent catalytic activity in dye degradation and the results of this study demonstrate the possible application of biogenic palladium nanoparticles as nanocatalyst in environmental remediation. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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“…The reduction of 4-nitrophenol by NaBH 4 at room temperature is a possible solution, and this model reaction has been widely investigated using noble-metalbased catalysts including Ag, 44 Au, 45 and Pt−Ni. 46 However, no work was reported on the reduction of 4-nitrophenol on Irbased catalysts that are well-known for their catalytic activity toward organic dye degradation, 24 hydrogenation, 47 and oxygen reduction 48 reactions.…”

Section: Introductionmentioning

confidence: 99%

Iridium Oxide Nanoparticles and Iridium/Iridium Oxide Nanocomposites: Photochemical Fabrication and Application in Catalytic Reduction of 4-Nitrophenol

Diao

Jin

et al. 2015

ACS Appl. Mater. Interfaces

112

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Hydrous iridium oxide (IrOx) nanoparticles (NPs) with an average diameter of 1.7 ± 0.3 nm were prepared via photochemical hydrolysis of iridium chloride in alkaline medium at room temperature. The photoinduced hydrolysis was monitored by time-dependent ultraviolet-visible (UV-vis) spectroscopy, and the effects of the incident wavelength and irradiation time on the production of IrOx NPs were systematically investigated. It was found that UV-vis irradiation is crucial for the generation of IrOx NPs during the hydrolysis of IrCl3, and once the irradiation was turned off, the hydrolysis reaction stopped immediately. The production rate of IrOx NPs greatly depended on the incident wavelength. There is a critical wavelength of 500 nm for the hydrolysis reaction, and IrOx NPs can only be produced under the illumination with an incident wavelength shorter than 500 nm. Moreover, the shorter the incident wavelength, the faster the growth rate of IrOx NPs. The obtained IrOx NPs were highly stable during two months of storage at 4 °C. The Ir/IrOx nanocomposites were prepared by surface reduction of IrOx NPs with NaBH4. The microstructure of the Ir/IrOx composite was characterized by transmission electron microscopy (TEM), and the presence of zero-valence Ir was confirmed by the X-ray diffraction (XRD) result. The Ir/IrOx nanocomposite exhibited good catalytic activity and high recycling stability toward the reduction of 4-nitrophenol. The catalytic activity per unit surface area of the Ir/IrOx composite catalyst was increased by a factor of 15 compared to that of pure Ir catalyst. The presence of the Ir/IrOx interfaces in the composite catalyst is believed to be responsible for the high activity.

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Shape-selective formation and characterization of catalytically active iridium nanoparticles

Cited by 69 publications

References 57 publications

Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

Green synthesis of palladium nanoparticles using gum ghatti (Anogeissus latifolia) and its application as an antioxidant and catalyst

Iridium Oxide Nanoparticles and Iridium/Iridium Oxide Nanocomposites: Photochemical Fabrication and Application in Catalytic Reduction of 4-Nitrophenol

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