Downshift of the Ni d band center over Ni nanoparticles <i>in situ</i> confined within an amorphous silicon nitride matrix

Asakuma, Norifumi; Tada, Shotaro; Tamura, Tomoyuki; Kawaguchi, Erika; Honda, Sawao; Asaka, Toru; Bouzid, Assil; Bernard, Samuel; Iwamoto, Yuji

doi:10.1039/d3dt04155g

Dalton Trans.

2024

DOI: 10.1039/d3dt04155g

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Downshift of the Ni d band center over Ni nanoparticles in situ confined within an amorphous silicon nitride matrix

Norifumi Asakuma,

Shotaro Tada,

Tomoyuki Tamura

et al.

Abstract: More covalent Ni–N bonds at Ni/amorphous Si3N4 heterointerfaces resulted in downshifting the Ni d band centerand facilitating H2 desorption.

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Encapsulating Nickel‐Iron Alloy Nanoparticles in a Polysilazane‐Derived Microporous Si−C−O−N‐Based Support to Stimulate Superior OER Activity

Miled,

Fradin,

Benbakoura

et al. 2024

ChemSusChem

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The in situ confinement of nickel (Ni)‐iron (Fe) nanoparticles (NPs) in a polymer‐derived micro‐/mesoporous silicon carboxynitride (Si‐C‐O‐N)‐based support is investigated to stimulate superior oxygen evolution reaction (OER) activity in an alkaline media. Firstly, we consider a commercial polysilazane (PSZ) and Ni and Fe salts to be mixed together in N,N‐dimethylformamide (DMF) in order to prepare a series of Ni‐Fe:organosilicon coordination complexes. The latter are then heat‐treated at 500 °C in flowing argon to form the title compounds. By considering a Ni:Fe ratio of 1.5, face centred cubic (fcc) NixFey alloy NPs with a size of 15‐30 nm are in situ generated in a micro‐/mesoporous Si‐C‐O‐N‐based support displaying a specific surface area (SSA) as high as 237 m2⋅g‐1. Hence, NPs are renderedaccessible to promote electrocatalytic water oxidation. An OER overpotential as low as 315 mV at 10 mA⋅cm‐2 is measured. This high catalytic performance (considering that the metal mass loading is as low as 0.24 mg cm−2) is rather stable as observed after an activation step; thus, validating our synthesis approach and opening further investigations. This is clearly attributed to both the strong NP‐matrix interaction and the confinement effect of the matrix as highlighted through post mortem microscopy observations.

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Encapsulating Nickel‐Iron Alloy Nanoparticles in a Polysilazane‐Derived Microporous Si−C−O−N‐Based Support to Stimulate Superior OER Activity

Miled,

Fradin,

Benbakoura

et al. 2024

ChemSusChem

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Modulating proportion of Ni0 species stabilized by Ni2+ on Ni-MgO catalyst with superior stability for dry reforming of methane

Liu,

Wen,

xie

et al. 2024

Chemical Engineering Journal

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Downshift of the Ni d band center over Ni nanoparticles in situ confined within an amorphous silicon nitride matrix

Abstract: More covalent Ni–N bonds at Ni/amorphous Si3N4 heterointerfaces resulted in downshifting the Ni d band centerand facilitating H2 desorption.

Cited by 2 publications

References 44 publications

Encapsulating Nickel‐Iron Alloy Nanoparticles in a Polysilazane‐Derived Microporous Si−C−O−N‐Based Support to Stimulate Superior OER Activity

Encapsulating Nickel‐Iron Alloy Nanoparticles in a Polysilazane‐Derived Microporous Si−C−O−N‐Based Support to Stimulate Superior OER Activity

Modulating proportion of Ni0 species stabilized by Ni2+ on Ni-MgO catalyst with superior stability for dry reforming of methane

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