Soft magnetic Fe5C2–Fe3C@C as an electrocatalyst for the hydrogen evolution reaction

Ye, Zhantong; Qie, Yaqin; Zhang, Fan; Liu, Yixuan; Shi, Zhan; Yang, Hua

doi:10.1039/c9dt00328b

Cited by 23 publications

(12 citation statements)

References 48 publications

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“…Transition metal carbides have attracted great interest in the past few years owing to their competitive catalytic behavior to that of Pt-based catalysts . Iron carbide, in this regard, has come out as a prominent candidate since it forms composites with carbon materials (carbon nanotubes, graphene, and meso/macroporous carbon), and their synergistic effects have shown enhanced catalytic performance. − Earlier synthesis reports on iron carbide involve a multistep synthesis process from various precursors and templates. ,− Graphitic carbon-encapsulated iron carbide has been explored for its excellent magnetic properties, but the quest for low-cost synthetic routes with excellent electrochemical properties (especially HER and ORR) is still on. − Doping with heteroatoms such as N/S/O alters the electronic structure and enhances the number of sites where H + can adsorb prior to reduction. The presence of heteroatoms (N) in carbon encapsulation has always exhibited an increase in the activity of graphite-encapsulated iron carbide species. ,, Sulfur as metal sulfides (as MoS 2 ) has shown promising HER activity close to platinum when prepared in edge-on orientation. − Both the elements S and N are appropriate choices for enhancement in catalytic properties when present in the carbon matrix.…”

Section: Introductionmentioning

confidence: 99%

Iron/Iron Carbide (Fe/Fe₃C) Encapsulated in S, N Codoped Graphitic Carbon as a Robust HER Electrocatalyst

2021

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In the present work, iron carbide (Fe/Fe3C) encapsulated in sulfur and nitrogen codoped graphitic carbon was synthesized using a low-cost, one-step pyrolytic method. The as-prepared nanomaterials were investigated for catalytic hydrogen evolution reaction (HER) in acidic medium. Doping of sulfur and nitrogen was achieved by adding different weights of thiourea along with ferrocene and toluene precursors. X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscopy verify the presence of sulfur and nitrogen species in the synthesized material. It is found that a small and optimum amount (10 and 20 wt %) of thiourea addition leads to significant enhancement in the number of active sites, which leads to a many-fold increase in current density for the prepared samples. Among the synthesized samples, Fe@C-SN/25 and Fe@C-SN/50 exhibit robust catalytic performance with overpotential values of 518 and 536 mV @ 10 mA cm–2, respectively, while an optimum S, N codoped graphitic carbon-Fe/Fe3C (Fe@C-SN/50) shows the lowest onset potential of 372 mV among its others counterparts, for a catalyst loading of 0.554 mg cm–2.

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Section: Introductionmentioning

confidence: 99%

Iron/Iron Carbide (Fe/Fe₃C) Encapsulated in S, N Codoped Graphitic Carbon as a Robust HER Electrocatalyst

2021

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“…In the present case, the existence of other phases i. e. the cementite and the ferric‐oxy‐hydroxide may contribute to further enhancing the multitasking catalytic abilities of the material. Literature further supports that the cementite is an active catalyst for hydrogen evolution reaction (HER), Oxygen reduction reaction (ORR) and Nitrogen reduction reaction (NRR) . Moreover, the presence of cementite in the mixed phase with Fe 2 O 3 improves the catalytic activity for Fischer‐Tropsch synthesis .…”

Section: Resultsmentioning

confidence: 94%

“…Literature further supports that the cementite is an active catalyst for hydrogen evolution reaction (HER), Oxygen reduction reaction (ORR) and Nitrogen reduction reaction (NRR). [56][57][58] Moreover, the presence of cementite in the mixed phase with Fe 2 O 3 improves the catalytic activity for Fischer-Tropsch synthesis. [59] Another important phase, the ferric-oxy-hydroxide was also found to be active for various catalytic applications, particularly for the OER, Fenton-type reactions and the reduction of NO 2 .…”

Section: Resultsmentioning

confidence: 99%

Multitasking FeOCN Composite as an Economic, Heterogeneous Catalyst for 1‐Octene Hydroformylation and Hydration Reactions

et al. 2020

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A highly efficient multitasking FeOCN composite was synthesized in a single step by the fast heating of an Fe(III) salt and urea. The composite was confirmed by various spectroscopic and analytical techniques which include XRD, FTIR, Raman, FESEM, and XPS analysis. The composite was then investigated for various organic transformations and it was found to be excellent for the hydroformylation of 1‐octene in toluene under 50 bar syngas pressure at 95 °C. The composite was also found to be significantly active for the hydration reactions of alkynes and nitriles under acid‐ and base‐free conditions. The hydration reactions were performed in aqueous methanol at 120 °C and an excellent yield of regioselective products was obtained under optimized reaction conditions.

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“…In addition, the coercivity is size dependent . No exchange coupling is noticed because both iron carbide and iron oxide phases are soft magnetic materials with comparable coercivity values in the nanoscale …”

Section: Resultsmentioning

confidence: 99%

Rapid Millifluidic Synthesis of Stable High Magnetic Moment Fe_xC_y Nanoparticles for Hyperthermia

Loizou

Mourdikoudis

Σεργίδης

et al. 2020

ACS Appl. Mater. Interfaces

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A millifluidic reactor with a 0.76 mm internal diameter was utilized for the synthesis of monodisperse, high magnetic moment, iron carbide (Fe x C y ) nanoparticles by thermal decomposition of iron pentacarbonyl (Fe(CO) 5 ) in 1-octadecene in the presence of oleylamine at 22 min nominal residence time. The effect of reaction conditions (temperature and pressure) on the size, morphology, crystal structure, and magnetic properties of the nanoparticles was investigated. The system developed facilitated the thermal decomposition of precursor at reaction conditions (up to 265 °C and 4 bar) that cannot be easily achieved in conventional batch reactors. The degree of carbidization was enhanced by operating at elevated temperature and pressure. The nanoparticles synthesized in the flow reactor had size 9–18 nm and demonstrated high saturation magnetization (up to 164 emu/g Fe ). They further showed good stability against oxidation after 2 months of exposure in air, retaining good saturation magnetization values with a change of no more than 10% of the initial value. The heating ability of the nanoparticles in an alternating magnetic field was comparable with other ferrites reported in the literature, having intrinsic loss power values up to 1.52 nHm 2 kg –1 .

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Soft magnetic Fe₅C₂–Fe₃C@C as an electrocatalyst for the hydrogen evolution reaction

Abstract: Herein, cubic iron carbide@N-doped carbon core-shell particles exhibited soft magnetic property and efficient HER catalytic activity.

Cited by 23 publications

References 48 publications

Iron/Iron Carbide (Fe/Fe₃C) Encapsulated in S, N Codoped Graphitic Carbon as a Robust HER Electrocatalyst

Iron/Iron Carbide (Fe/Fe₃C) Encapsulated in S, N Codoped Graphitic Carbon as a Robust HER Electrocatalyst

Multitasking FeOCN Composite as an Economic, Heterogeneous Catalyst for 1‐Octene Hydroformylation and Hydration Reactions

Rapid Millifluidic Synthesis of Stable High Magnetic Moment Fe_xC_y Nanoparticles for Hyperthermia

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Soft magnetic Fe5C2–Fe3C@C as an electrocatalyst for the hydrogen evolution reaction

Abstract: Herein, cubic iron carbide@N-doped carbon core-shell particles exhibited soft magnetic property and efficient HER catalytic activity.

Cited by 23 publications

References 48 publications

Iron/Iron Carbide (Fe/Fe3C) Encapsulated in S, N Codoped Graphitic Carbon as a Robust HER Electrocatalyst

Iron/Iron Carbide (Fe/Fe3C) Encapsulated in S, N Codoped Graphitic Carbon as a Robust HER Electrocatalyst

Multitasking FeOCN Composite as an Economic, Heterogeneous Catalyst for 1‐Octene Hydroformylation and Hydration Reactions

Rapid Millifluidic Synthesis of Stable High Magnetic Moment FexCy Nanoparticles for Hyperthermia

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Soft magnetic Fe₅C₂–Fe₃C@C as an electrocatalyst for the hydrogen evolution reaction

Iron/Iron Carbide (Fe/Fe₃C) Encapsulated in S, N Codoped Graphitic Carbon as a Robust HER Electrocatalyst

Iron/Iron Carbide (Fe/Fe₃C) Encapsulated in S, N Codoped Graphitic Carbon as a Robust HER Electrocatalyst

Rapid Millifluidic Synthesis of Stable High Magnetic Moment Fe_xC_y Nanoparticles for Hyperthermia