Synthesis of Co<sub>2</sub>FeGe Heusler alloy nanoparticles and catalysis for selective hydrogenation of propyne

Kojima, Takayuki; Nakaya, Yuki; Ham, Hyungwon; Kameoka, Satoshi; Furukawa, Shinya

doi:10.1039/d1ra02884g

Cited by 13 publications

(32 citation statements)

References 34 publications

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“…Theoretical prediction , and successful experimental preparation of Heusler alloys in nanocrystalline forms have extended the application of these prototype ternary ferromagnetic alloys to nanometric devices. Researchers have already demonstrated the application of these nanoparticles in hyperthermia treatment of cancer cells, SARS Cov-2 detection, catalysis, biosensing, spintronics, etc. The advantages of Heusler alloy nanoparticles are mostly due to their novel properties such as high saturation magnetization ( M s ), high effective anisotropy constant ( K eff ), high Curie temperature ( T c ), tunability of magnetic properties, soft magnetic behavior, etc.…”

Section: Introductionmentioning

confidence: 99%

Single-Domain Fe₂CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

2023

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Single-domain Fe 2 CoAl nanoparticles exhibiting an Xtype ordered Heusler alloy structure have been prepared by a simple template-less chemical process. Near-stoichiometric Fe 2 CoAl nanoparticles with three different average crystallite sizes of 41, 45, and 51 nm exhibit soft ferromagnetic behavior with high saturation magnetization (>95% of the theoretical estimate), high effective magnetic anisotropy (∼10 7 erg/cc), and a high Curie temperature (∼1225 K). The property variation of the nanoparticles with crystallite size has been explained using well-established theoretical models. Ab initio calculations performed in this study, apart from establishing the preferred crystal structure, also help to understand the magnetic and half-metallic properties of the alloy. Critical size estimations authenticate the formation of single-domain Fe 2 CoAl nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Single-Domain Fe₂CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

2023

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“…For example, Wang et al showed the applicability of HA nanoparticles in spintronics, 9 and Kappe et al utilized these HA nanoparticles in biosensing. 10 HA nanoparticles have also been employed in catalysis, 11 SARS CoV-2 detection, 12 hyperthermia treatment of cancer, 13 etc. Apart from the mechanical alloying route, HA nanoparticles have also been synthesized by co-precipitation, 14 and chemical 15 routes.…”

Section: Introductionmentioning

confidence: 99%

Size-dependent properties of single domain Fe₂CoGa nanoparticles prepared by a facile template-less chemical route

2022

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“…Characteristics of samples 1-3). Particle size of sample 1) is the average value estimated by scanning TEM in a previous report, [16] while those of samples 2) and 3) are the product of crystallite size and 23/15 (size ratio of particle and crystallite in sample 1). Surface area was calculated from particle size and density on the assumption of spherical shape.…”

Section: Resultsmentioning

confidence: 94%

Co₂FeGe Heusler Alloy Nanoparticle Catalysts for Propyne Hydrogenation and Ammonia Decomposition

Kojima,

Nakaya,

Tate

et al. 2023

ChemistryOpen

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Heusler alloys (X2YZ) can be a candidate for new catalysts as well as other intermetallic compounds. We previously found good catalytic properties of Co2FeGe for selective hydrogenation of alkynes and developed nanoparticles of Co2FeGe supported on SiO2. However, the average diameter of the nanoparticles was 23 nm, which is not small enough compared to those of state‐of‐the‐art nanoparticle catalysts. In this study, we developed SiO2‐supported Co2FeGe nanoparticles of <10 nm in diameter. A catalytic test for selective hydrogenation of propyne indicated a partial formation of sites with low selectivity including excess Co atoms. For ammonia decomposition, enhancement of turnover frequency was achieved by reducing the particle size.

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Synthesis of Co₂FeGe Heusler alloy nanoparticles and catalysis for selective hydrogenation of propyne

Abstract: Although intermetallic compounds are attracting attention of catalysis researchers, ternary intermetallic catalysts have scarcely been investigated due the difficulty of synthesizing supported nanoparticles.

Cited by 13 publications

References 34 publications

Single-Domain Fe₂CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

Single-Domain Fe₂CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

Size-dependent properties of single domain Fe₂CoGa nanoparticles prepared by a facile template-less chemical route

Co₂FeGe Heusler Alloy Nanoparticle Catalysts for Propyne Hydrogenation and Ammonia Decomposition

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Synthesis of Co2FeGe Heusler alloy nanoparticles and catalysis for selective hydrogenation of propyne

Abstract: Although intermetallic compounds are attracting attention of catalysis researchers, ternary intermetallic catalysts have scarcely been investigated due the difficulty of synthesizing supported nanoparticles.

Cited by 13 publications

References 34 publications

Single-Domain Fe2CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

Single-Domain Fe2CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

Size-dependent properties of single domain Fe2CoGa nanoparticles prepared by a facile template-less chemical route

Co2FeGe Heusler Alloy Nanoparticle Catalysts for Propyne Hydrogenation and Ammonia Decomposition

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Synthesis of Co₂FeGe Heusler alloy nanoparticles and catalysis for selective hydrogenation of propyne

Single-Domain Fe₂CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

Single-Domain Fe₂CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

Size-dependent properties of single domain Fe₂CoGa nanoparticles prepared by a facile template-less chemical route

Co₂FeGe Heusler Alloy Nanoparticle Catalysts for Propyne Hydrogenation and Ammonia Decomposition