Electrical and magnetic properties of FeS<sub>2</sub> and CuFeS<sub>2</sub> nanoplates

Li, Bo; Huang, Le; Zhong, Mianzeng; Wei, Zhongming; Li, Jingbo

doi:10.1039/c5ra16918f

Cited by 38 publications

(32 citation statements)

References 32 publications

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“…The high-resolution C 1s spectrum can be decoupled into five bands (Figure 4b), which correspond to CC (284.0 eV), CC (284.9 eV), CO (286.5 eV), CO (287.6 eV), and OCO (289.0 eV). [51,52] The high-resolution Fe 2p spectrum reveals two prominent components that can be assigned as Fe 2p 3/2 (707.8 eV) and Fe 2p 1/2 (721.2 eV), which is consistent with the literature values of electron-binding energies of Fe 2+ cations in FeS 2 (Figure 4d). [51,52] The high-resolution Fe 2p spectrum reveals two prominent components that can be assigned as Fe 2p 3/2 (707.8 eV) and Fe 2p 1/2 (721.2 eV), which is consistent with the literature values of electron-binding energies of Fe 2+ cations in FeS 2 (Figure 4d).…”

Section: Introductionsupporting

confidence: 88%

“…[49,50] The characteristic peaks of S 2p 3/2 and S 2p 1/2 are observed at binding energies of 162.8 and 163.9 eV (Figure 4c), respectively, which match literature results for FeS 2 . [51,52] All the aforementioned characterizations confirm the successful synthesis of FeS 2 nanoparticles on RGO nanosheets. [51,52] All the aforementioned characterizations confirm the successful synthesis of FeS 2 nanoparticles on RGO nanosheets.…”

Section: Introductionmentioning

confidence: 55%

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FeS₂ Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High‐Performance Electrocatalysts

Chen

et al. 2017

Advanced Energy Materials

152

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Developing low‐cost, highly efficient, and robust earth‐abundant electrocatalysts for hydrogen evolution reaction (HER) is critical for the scalable production of clean and sustainable hydrogen fuel through electrochemical water splitting. This study presents a facile approach for the synthesis of nanostructured pyrite‐phase transition metal dichalcogenides as highly active, earth‐abundant catalysts in electrochemical hydrogen production. Iron disulfide (FeS2) nanoparticles are in situ loaded and stabilized on reduced graphene oxide (RGO) through a current‐induced high‐temperature rapid thermal shock (≈12 ms) of crushed iron pyrite powder. FeS2 nanoparticles embedded in between RGO exhibit remarkably improved electrocatalytic performance for HER, achieving 10 mA cm−2 current at an overpotential as low as 139 mV versus a reversible hydrogen electrode with outstanding long‐term stability under acidic conditions. The presented strategy for the design and synthesis of highly active earth‐abundant nanomaterial catalysts paves the way for low‐cost and large‐scale electrochemical energy applications.

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Section: Introductionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 55%

FeS₂ Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High‐Performance Electrocatalysts

Chen

et al. 2017

Advanced Energy Materials

152

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“…For example, FeS2 tend to grow in three dimensions, but two-dimensional FeS2 nanoplates have been reported. 51,52 Thus, certain synthesis parameters force the NCs to grow in a non-energetically favored shape and yield two-dimensional structures. What drives this anisotropic growth?…”

Section: Figure 1: Evolution Of the Gibbs Free Energy Of A Cluster Vementioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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Abstract:In this paper, we review recent progresses on colloidal growth of 2D nanocrystals.We identify four main sources of anisotropy which lead to the formation of plate-and sheetlike colloidal nanomaterials. Defect induced anisotropy is a growth method which relies on the presence of topological defects at the nanoscale to induce 2D shapes objects. Such a method is particularly important in the growth of metallic nanoobjects. Another way to induce anisotropy is based on ligand engineering. The availability of some nanocrystal facets can be tuned by selectively covering the surface with ligands of tunable thickness. Cadmium chalcogenides nanoplatelets (NPLs) strongly rely on this method which offers atomic control in the thinner direction, down to a few monolayers. 2D objects can also be obtained by post or in situ self-assembly of nanocrystals. This growth method differs from the previous ones in the sense that the elementary objects are not molecular precursors, and is a common method for lead chalcogenide compounds. Finally, anisotropy may simply rely on the lattice anisotropy itself as it is common for rod-like nanocrystals. Colloidally grown Transition Metal DiChalcogenides (TMDC) in particular result from such process. We also present hybrid syntheses which combine several of the previously described methods and other paths, such as cation exchange, which expand the range of available materials. Finally, we discuss in which sense 2D-objects differ from 0D nanocrystals and review some of their applications in optoelectronics, including lasing and photodetection, and biology.

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“…The properties of CuFeS 2 nanocrystals strongly influence its electrical, magnetic and electrochemical behavior [1,2]. The ternary compound has many potential applications in inexpensive nanoelectronics such as solar cells and in magnetic area [3]. Chalcopyrite is the Earth most abundant Cu-bearing mineral and accounts for approximately 70% of the world's copper reserves.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Reduction of Chalcopyrite CuFeS₂: Changes in Composition and Magnetic Properties

et al. 2017

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High-energy milling of sulphides with a reactive metal in so-called mechanochemical reduction mode can lead to products in nanorange and to composition which simplifies the following metallurgical processing. Chalcopyrite CuFeS2, a ternary semiconductor with antiferromagnetic properties represents promising candidate as an advanced material for use in inexpensive nanoelectronics (solar cells, magnetic area), as well as copper ore source in metallurgical operations. In this work, the process of mechanochemical reduction of chalcopyrite with elemental iron is studied. The composition and properties of nanopowder prepared by high-energy milling were analyzed by X-ray diffraction and magnetic measurements. Most of the reaction takes place during 30 min with chalcocite Cu2S and troilite FeS as the only reaction products. The magnetic investigations reveal significant increase of saturation magnetization as a result of milling. Unlike the conventional high-temperature reduction of chalcopyrite, the mechanochemical reduction is fast and ambient temperature and atmospheric pressure are sufficient for its propagation.

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Electrical and magnetic properties of FeS₂ and CuFeS₂ nanoplates

Abstract: The as-made pyrite (FeS2) and chalcopyrite (CuFeS2) nanoplates exhibit abnormal strong ferromagnetic behavior due to the dangling bonds on surface.

Cited by 38 publications

References 32 publications

FeS₂ Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High‐Performance Electrocatalysts

FeS₂ Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High‐Performance Electrocatalysts

Two-Dimensional Colloidal Nanocrystals

Mechanochemical Reduction of Chalcopyrite CuFeS₂: Changes in Composition and Magnetic Properties

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Electrical and magnetic properties of FeS2 and CuFeS2 nanoplates

Abstract: The as-made pyrite (FeS2) and chalcopyrite (CuFeS2) nanoplates exhibit abnormal strong ferromagnetic behavior due to the dangling bonds on surface.

Cited by 38 publications

References 32 publications

FeS2 Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High‐Performance Electrocatalysts

FeS2 Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High‐Performance Electrocatalysts

Two-Dimensional Colloidal Nanocrystals

Mechanochemical Reduction of Chalcopyrite CuFeS2: Changes in Composition and Magnetic Properties

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Product

Resources

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Electrical and magnetic properties of FeS₂ and CuFeS₂ nanoplates

FeS₂ Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High‐Performance Electrocatalysts

FeS₂ Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High‐Performance Electrocatalysts

Mechanochemical Reduction of Chalcopyrite CuFeS₂: Changes in Composition and Magnetic Properties