Role of polyol in the synthesis of Fe particles

Joseyphus, R. Justin; Kodama, Daisuke; Matsumoto, Takatoshi; Sato, Yasuhisa; Jeyadevan, B.; Tohji, Kazuyuki

doi:10.1016/j.jmmm.2006.10.1132

Cited by 105 publications

(56 citation statements)

References 3 publications

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“…Over the past decade the polyol process has been used to synthesize metallic nanoparticles such as Pt [132,133], Pd [88,134], Au [135], Fe [136], Ni [137,138], Co [139], Ag [140,141], Cu [142,143], Sn [144], and Rh [73]. Platinum is one of the most active metal catalysts toward many electrochemical reactions, such as oxidation of small molecules and reduction of molecular oxygen in PEMFC.…”

Section: Orr Activity On Various Carbon Supported Nanoparticles Prepamentioning

confidence: 99%

Recent Advances in Carbon Supported Metal Nanoparticles Preparation for Oxygen Reduction Reaction in Low Temperature Fuel Cells

et al. 2015

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Abstract:The oxygen reduction reaction (ORR) is the oldest studied and most challenging of the electrochemical reactions. Due to its sluggish kinetics, ORR became the major contemporary technological hurdle for electrochemists, as it hampers the commercialization of fuel cell (FC) technologies. Downsizing the metal particles to nanoscale introduces unexpected fundamental modifications compared to the corresponding bulk state. To address these fundamental issues, various synthetic routes have been developed in order to provide more versatile carbon-supported low platinum catalysts. Consequently, the approach of using nanocatalysts may overcome the drawbacks encountered in massive materials for energy conversion. This review paper aims at summarizing the recent important advances in carbon-supported metal nanoparticles preparation from colloidal methods (microemulsion, polyol, impregnation, Bromide Anion Exchange…) as cathode material in low temperature FCs. Special attention is devoted to the correlation of the structure of the nanoparticles and their catalytic properties. The influence of the synthesis method on the electrochemical properties of the resulting catalysts is also discussed. Emphasis on analyzing data from theoretical models to address the intrinsic and specific electrocatalytic properties, depending on the synthetic method, is incorporated throughout. The synthesis process-nanomaterials structure-catalytic activity relationships highlighted herein, provide ample new rational, convenient and OPEN ACCESSCatalysts 2015, 5 311 straightforward strategies and guidelines toward more effective nanomaterials design for energy conversion.

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Section: Orr Activity On Various Carbon Supported Nanoparticles Prepamentioning

confidence: 99%

Recent Advances in Carbon Supported Metal Nanoparticles Preparation for Oxygen Reduction Reaction in Low Temperature Fuel Cells

et al. 2015

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“…Magnetic hyperthermia therapies employing large specific loss power generated using superparamagnetic nanoparticles have attracted attention as a promising anti-cancer treatment. 13) Spinel-structured iron oxide particles are especially suitable for such applications because of their chemical stability. Many methods such as co-precipitation, 35) solgel synthesis, 68) and hydrothermal treatment 9,10) have been used to prepare spinel-structured iron oxide particles.…”

Section: Introductionmentioning

confidence: 99%

“…11,12) The shape of the synthesized particles was almost unchanged from that of platelet ¡-FeOOH particles, and the coercive force, which depends on shape anisotropy was in the range 814 kA/m. In addition to the gas-phase reduction process using H 2 gas, a liquid-phase reduction process has been reported for the synthesis of iron 13) and iron-based alloy particles. 14,15) In this process, precursor metal salt solutions are reduced by a polyhydric alcohol (polyol method).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Spinel-Structured Iron Oxide Nanoparticles Synthesized by Heating of α-FeOOH Platelets in Tetra-Ethylene Glycol

et al. 2014

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Fe 3 O 4 particles were synthesized from platelet ¡-FeOOH particles by a liquid-phase reduction process using tetra-ethylene glycol as reduction agent, for their application in hyperthermia or thermoablation therapies that employ hysteresis-loss heating. Fe 3 O 4 particles 60100 nm in size were finally obtained by heating. The saturation magnetization of the obtained particles increased with the heating time to reach a maximum value of approximately 80 Am 2 /kg. In contrast, the coercive force of the particles was nearly constant at approximately 1213 kA/m and was independent of the heating time. Lattice image observation of the synthesized Fe 3 O 4 particles revealed to obtain single crystals. On the basis of experimental results, it was concluded that the single-crystal Fe 3 O 4 particles were formed by recrystallization through the dissolution and precipitation of iron ions from ¡-Fe 2 O 3 formed by the dehydration of ¡-FeOOH. The recrystallization of the Fe 3 O 4 particles was promoted with increasing ¡-FeOOH particle content in tetra-ethylene glycol up to about 0.022 g/mL.

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“…We previously synthesized £-Fe 2 O 3 platelets from ¡-FeOOH platelets using hydrogen gas as a reduction agent for application in magnetic hyperthermia and thermoablation therapies by hysteresis-loss heating. 13,14) In the study, SiO 2 coated ¡-FeOOH was dehydrated to ¡- Iron 16) and iron-based alloy 17,18) particles have been synthesized by reducing precursor metal salt solutions with a polyhydric alcohol. The particles assumed spherical or cubical shapes.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Spinel-Structured Iron Oxide Particles Synthesized by Heating α-Fe<sub>2</sub>O<sub>3</sub> Platelets in Tetra-Ethylene Glycol

et al. 2013

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Platelet particles of ¡-Fe 2 O 3 3050 nm in size were heated in tetra-ethylene glycol to obtain spinel-structured iron oxide particles, which were confirmed by X-ray diffraction. With heating, 100 nm platelets were formed, and the proportion of the 100 nm platelets increased in comparison to 3050 nm platelets with increasing duration of heating. In all the samples, irrespective of the heating time used during synthesis, the coercive force, which was considered to be dependent on the shape anisotropy of the platelet particles, remained nearly constant at 12.7 13.5 kA/m (160170 Oe). The saturation magnetization initially increased and then decreased with the heating time and the maximum value observed was 80.5 Am 2 /kg (80.5 emu/g). The reduction and oxidation were considered to occur simultaneously during the synthesis.

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Role of polyol in the synthesis of Fe particles

Cited by 105 publications

References 3 publications

Recent Advances in Carbon Supported Metal Nanoparticles Preparation for Oxygen Reduction Reaction in Low Temperature Fuel Cells

Recent Advances in Carbon Supported Metal Nanoparticles Preparation for Oxygen Reduction Reaction in Low Temperature Fuel Cells

Characterization of Spinel-Structured Iron Oxide Nanoparticles Synthesized by Heating of α-FeOOH Platelets in Tetra-Ethylene Glycol

Characterization of Spinel-Structured Iron Oxide Particles Synthesized by Heating α-Fe<sub>2</sub>O<sub>3</sub> Platelets in Tetra-Ethylene Glycol

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Role of polyol in the synthesis of Fe particles

Cited by 105 publications

References 3 publications

Recent Advances in Carbon Supported Metal Nanoparticles Preparation for Oxygen Reduction Reaction in Low Temperature Fuel Cells

Recent Advances in Carbon Supported Metal Nanoparticles Preparation for Oxygen Reduction Reaction in Low Temperature Fuel Cells

Characterization of Spinel-Structured Iron Oxide Nanoparticles Synthesized by Heating of &alpha;-FeOOH Platelets in Tetra-Ethylene Glycol

Characterization of Spinel-Structured Iron Oxide Particles Synthesized by Heating &alpha;-Fe<sub>2</sub>O<sub>3</sub> Platelets in Tetra-Ethylene Glycol

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Characterization of Spinel-Structured Iron Oxide Nanoparticles Synthesized by Heating of α-FeOOH Platelets in Tetra-Ethylene Glycol

Characterization of Spinel-Structured Iron Oxide Particles Synthesized by Heating α-Fe<sub>2</sub>O<sub>3</sub> Platelets in Tetra-Ethylene Glycol