Low temperature in situ immobilization of nanoscale fcc and hcp polymorphic nickel particles in polymer-derived Si–C–O–N(H) to promote electrocatalytic water oxidation in alkaline media

Abstract

We synthesized nickel (Ni) nanoparticles (NPs) in a high specific surface area (SSA) p-block element-containing inorganic compound prepared via the polymer-derived ceramics (PDC) to dispatch the obtained nanocomposite towards oxygen...

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

“…1(a), indicating the occurrence of reactions involving both units. As already reported by our group, 23 we suggest that hydrosilylation reactions between Si–H and CC occur and are probably catalytically promoted by Ni 2+ species. Additionally, the relative intensity of the ν N–H bond at 3379 cm −1 also decreases in NiPSZ although Ni(NH 3 ) 6 Cl 2 as a Ni precursor monomer has amine ligands.…”

“…1(a), indicating the occurrence of reactions involving both units. As already reported by our group, 23 we suggest that hydrosilylation reactions between Si-H and CvC occur and are probably catalytically promoted by Ni 2+ species. Additionally, the relative inten-…”

“…This means that dehydrogenation reactions between N-H and Si-H in the polysilazane are also promoted and possibly catalyzed by the Ni 2+ species, which has already been suggested in our previous works. 17,23 Therefore, the degree of cross-linking of NiPSZ is expected to increase compared to PSZ because of the formation of carbosilane chains (hydrosilylation) and -Si-Nbonds (dehydrogenation) in the PSZ network.…”

An in situ growth route towards anti-perovskite Ni3InN nanoparticles embedded within amorphous silicon nitride

“…18 This bottom-up approach allows the growth of M and/or MN nanoparticles in situ distributed in a Si-based ceramic matrix. [19][20][21][22][23][24][25][26][27][28][29][30][31] The accessibility to metal nanoparticles/Si-based nanocomposites using the PDC route and its advantages for catalytic applications have been discussed. 32 Recently, various M/Si-(oxy-)carbide (SiC, SiOC), Sicarb(oxy)nitride (SiCN, SiCON), and Si-nitride (Si 3 N 4 ) matrix composites have been synthesized via the PDC route, and some of these inorganic materials exhibit excellent performance as robust and reusable heterogeneous catalysts in applications such as thermal catalytic hydrogenation, dehydrogenation of organic compounds, [21][22][23][24][25] the dehydrogenation of hydrides 30 and electrocatalytic water oxidation 26 under harsh conditions.…”

Hierarchically Porous Ceramic and Metal‐Ceramic Hybrid Materials Structured by Vat Photopolymerization‐Induced Phase Separation

“…Ni, which is a highly suitable catalyst in CO 2 utilization reactions such as CO 2 methanation, [69] has been increasingly considered as a model material with regard to the immobilization of catalytically active centers by in situ formation of metal nanoparticles within PDCs. [55,60,70,71] Consequently, the Ni-modified system developed in this study was evaluated toward its prospective use as monolithic catalyst material, providing both catalyst and carrier functionality. The first process modification toward this prospective application was an increase of the Ni content within the final material from 5 wt.% to 20 wt.%, which was successfully accomplished without a need for changing the polysiloxane functionalization approach or the printing parameters.…”