Controlled attachment of ultrafine iridium nanoparticles on mesoporous aluminosilicate granules with carbon nanotubes and acetyl acetone

Amirsardari, Zahra; Dourani, Akram; Amirifar, Mohamad Ali; Massoom, Nooredin Ghadiri; Jahannama, Mohammad Reza

doi:10.1016/j.matchemphys.2019.122015

Cited by 7 publications

(2 citation statements)

References 40 publications

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“…[40,[117][118][119][120][121][122][123] As early as in 1978, Miles et al studied the OER properties of Ir in acid at 80 °C and found that the best OER catalyst consists of Ir metal with IrO 2 film on the surface possessing metallic characteristics. [124] As a typical transition metal, Ir tends to form nanoparticles to reduce the high surface energy, [40,118,120,[125][126][127] which is not beneficial to property enhancement and in-depth understanding of its intrinsic activity. One effective strategy to dealing with this issue is to design and synthesize ultrathin 2D Ir nanostructures with high ECSA to largely expose its active sites.…”

Section: Mono-metallic Ir Nanostructuresmentioning

confidence: 99%

Recent Progress in Advanced Electrocatalyst Design for Acidic Oxygen Evolution Reaction

et al. 2021

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more promising approach to generating H 2 with high purity. Electrochemical water splitting, driven by renewable electricity, proceeds through hydrogen evolution reaction (HER) at the cathode side and oxygen evolution reaction (OER) at the anode side of an electrochemical cell. [7,10] The HER, a two-electron transfer process, is the simplest electrochemical reaction and relatively easy to occur. On the contrary, OER involving four-electron transfer is a much more complicated multistep reaction. A considerably large overpotential is thus added to the actual water splitting process because of the complexity of OER, leading to sluggish reaction kinetics and distinctly reducing the energy efficiency. [11] Therefore, efficient electrocatalysts with high activity and durable stability are needed to overcome the high energy barrier.OER is an electrochemical process of producing molecular O 2 through a series of proton-electron coupled steps. [12][13][14] Depending on the pH of the electrolytes, the reaction pathways of producing O 2 are totally different. In alkaline electrolytes, hydroxyl groups (OH − ) are oxidized and converted to H 2 O and O 2 . In acidic media, two water molecules (H 2 O) are oxidized generating four protons (H + ) and O 2 . Compared to acidic OER, alkaline OER possesses more favorable reaction kinetics because of the abundant hydroxyl groups in the electrolyte. For acidic OER, however, the break of the strong covalent OH bond of H 2 O requires high energy thus leading to more sluggish kinetics. Another advantage for alkaline OER lies in the wide range of catalysts such as transition metal (e.g., Ni, Co, and Fe) based oxides and hydroxides as well as carbon materials. [15][16][17][18][19][20][21][22] The electrocatalysts for acidic OER are mostly related to iridium (Ir) and ruthenium (Ru) based materials currently. [19,[23][24][25][26][27][28][29][30][31] In spite of the more favorable kinetics and wide range of catalysts for alkaline OER, however, acidic OER is more preferable than alkaline OER because of the diversified advantages of proton exchange membrane water electrolyzers over alkaline water electrolyzers. [19,23] Proton exchange membrane (PEM) is an acidic solid polymer electrolyte membrane with much smaller gas crossover than that of the alkaline solid polymer, which can ensure a larger load range and much safer operation of an acidic electrolyzer by largely avoiding forming H 2 /O 2 mixture. [32] Furthermore, the fully developed PEMs can provide high proton conductivity, resulting in low Ohmic loss and high current density. [32] Proton exchange membrane (PEM) water electrolyzers hold great significance for renewable energy storage and conversion. The acidic oxygen evolution reaction (OER) is one of the main roadblocks that hinder the practical application of PEM water electrolyzers. Highly active, cost-effective, and durable electrocatalysts are indispensable for lowering the high kinetic barrier of OER to achieve boosted reaction kinetics. To date, a wide spectrum of advanced electroca...

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Section: Mono-metallic Ir Nanostructuresmentioning

confidence: 99%

Recent Progress in Advanced Electrocatalyst Design for Acidic Oxygen Evolution Reaction

et al. 2021

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“…Although the catalyst support plays a key role in enhancing the overall rate of catalytic decomposition, very few comparative studies have been carried out on the efficiency of different catalyst supports in hydrazine decomposition. The reason is that most researchers have done their studies using one form of support rather than using different carriers for a desired reaction [8][9][10][11]. Perhaps, because the commercial catalyst (iridium on gamma-alumina) for hydrazine decomposition has a spherical form [12][13][14], less has been paid to various forms of catalyst support in the present papers, but in the species such as hydrogen peroxides, there are some reports about the influence of the shape of catalyst support on the decomposition rate [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Development of novel supported iridium nanocatalysts for special catalytic beds

et al. 2019

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In the present paper, an experimental study of the catalytic decomposition of hydrous hydrazine was investigated on the different structural forms of the catalyst. The synthesized iridium catalysts have been usually used directly and have not been evaluated in the laboratory reactor. This study includes the preparation of iridium-based catalysts supported on spherical (alumina), honeycomb monoliths (cordierite) and foams (alumina) for the evaluation of catalytic activity in the laboratory reactor. The characterizations of these catalysts were evaluated by the TGA, FESEM and BET analysis. The result of the catalytic characterization of monolithic support was shown a homogeneous distribution of active metal without any problem of sintering (average size 25 nm) on the support surface. While the surface of the spherical and foam supports were shown non-uniform distribution of nanoparticles on the support skeleton (average size 55 nm). The monolithic catalyst exhibits higher decomposition rate and H 2 selectivity than other supports due to uniform in shape and particle size distribution.

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Method for Preventing the Contamination of Iridium Nanocatalyst during Plasma Arc Welding Procedure

Amirsardari

Vahidshad

Amirifar

et al. 2021

J Fail. Anal. and Preven.

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Controlled attachment of ultrafine iridium nanoparticles on mesoporous aluminosilicate granules with carbon nanotubes and acetyl acetone

Cited by 7 publications

References 40 publications

Recent Progress in Advanced Electrocatalyst Design for Acidic Oxygen Evolution Reaction

Recent Progress in Advanced Electrocatalyst Design for Acidic Oxygen Evolution Reaction

Development of novel supported iridium nanocatalysts for special catalytic beds

Method for Preventing the Contamination of Iridium Nanocatalyst during Plasma Arc Welding Procedure

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