Fabrication of yolk-shell NiCo alloy@C composites derived from trimetallic metal–organic frameworks as light-weight and high-performance electromagnetic wave absorbers

Shu, Ruiwen; Wu, Yue; Li, Xiaohui; Zhang, Jiabin; Wan, Zongli; Li, Ningning

doi:10.1016/j.compositesa.2021.106451

Cited by 45 publications

(8 citation statements)

References 39 publications

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“…The lattice d-spacing of 0.46 nm was observed for MA (311) . The d-spacing of 0.21 and 0.30 nm is attributed to the Ni–CO alloy (111) and B–Ni–Co (111) species (Figure c,d). − Figure S3b represents the EDS analysis of the catalyst that also confirmed the presence of Ni, Co, Mg, Al, O, and B. The elemental analysis results obtained from TEM/EDS and ICP-OES analysis are comparable for Ni and Co (Table S2).…”

Section: Resultsmentioning

confidence: 73%

NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

Shakir

Prasad

Ray

et al. 2022

ACS Appl. Nano Mater.

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Carbon deposition on a catalyst surface is detrimental to the dry reforming of methane (DRM) reaction. The addition of boron (B) is found to be effective in lowering carbon deposition. In this study, bimetallic Ni, Co catalysts over MgAl 2 O 4 (MA) [B−(Ni−Co)/ MA] with different Ni/Co ratios are synthesized by the NaBH 4 reduction method and examined for DRM at 600 °C and atmospheric pressure. The NaBH 4 plays crucial roles in reducing metal salt to metal, incorporating B, and enhancing the dispersion of active metallic species in a one-step catalyst preparation method. Rod-like Ni−Co alloy and B−(Ni−Co) nanostructures on the two-dimensional flakes of MA are observed. The Ni-rich B-containing bimetallic [B−(75Ni−25Co)] catalyst exhibits better methane and carbon dioxide conversions compared to other prepared catalysts. The turnover frequency (CH 4 ) and produced syngas ratio of the B-catalyst are 1.5 and 1.04 times, respectively, higher than the non-B catalyst prepared by the traditional impregnation method with the same Ni/Co ratio. The catalyst [B− (75Ni−25Co)] exhibits higher activity and almost a steady conversion rate, while continuous decrement is observed for the non-B catalyst. Exceptionally low carbon deposition (∼3.6 times) was observed for B−(75Ni−25Co)/ MA than the non-B catalyst. Furthermore, the density functional theory investigation also revealed that the adsorption energy (E ads ) of carbon at various sites of 75Ni25Co significantly reduces by ∼0.5 eV in the presence of B, causing hindrance to the formation of carbon over the surface.

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Section: Resultsmentioning

confidence: 73%

NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

Shakir

Prasad

Ray

et al. 2022

ACS Appl. Nano Mater.

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“…The unique core–shell NP-embedded dodecahedron structure has an optimized porous structure and graphitization level, with multiple reflections of EMW as well as coordinated impedance matching. Multiple reflections of EMW are feasible for increasing EMW transmission paths, and the unique structure can induce various forms of energy dissipation. , The abundant heterogeneous interface between metallic Co cores and nitrogen-doped carbon shells, Co@NC nanoparticles, and rhombic dodecahedral carbons will induce the interfacial polarization. Furthermore, the abundant free charge accumulation at the interface between Co NPs and N-doped C as well as the interface between Co@NC and dodecahedron promotes the excellent interfacial polarization.…”

Section: Resultsmentioning

confidence: 99%

Metal/N-Doped Carbon Nanoparticles Derived from Metal–Organic Frameworks for Electromagnetic Wave Absorption

Zeng

Nie

et al. 2022

ACS Appl. Nano Mater.

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Metal–organic frameworks (MOFs) have diverse structures and compositions, inspiring the boundless enthusiasm and creativity of researchers in the field of electromagnetism. The synthesis of MOF-derived nanomaterials for electromagnetic wave (EMW) absorption with ultrathin matching thickness (below 1.6 mm) is highly desired and challenging. Here, we demonstrate a general synthesis strategy for metal (Co, Ni, Fe)-based MOFs, which transformed into metal/metal-oxide nanoparticles (NPs) of being coated by nitrogen (N)-doped graphitized carbon. The obtained carbon-coated NPs show excellent EMW absorption properties. Specifically, Co-based MOFs are pyrolyzed into rhombic dodecahedrons with numerous ultrasmall Co NPs coated by N-doped carbon (Co-NC core–shell NPs). The synthesized Co-NC core–shell NPs possess a unique porous structure, abundant defects, and doped N heteroatoms, resulting in good magnetic loss (eddy current loss), dielectric loss (multiple reflections, interfacial polarization, conduction loss), and impedance matching. Therefore, the Co-NC core–shell NPs exhibit an excellent EMW absorption property with a very strong reflection loss of −56.5 dB at a matching thickness of only 1.58 mm. The effective absorption bandwidth (EAB) is 4.4 GHz. In addition, the EAB between 1 and 5 mm in thickness is up to 13.2 GHz, which already includes all C bands and X bands, even the absolute S bands and Ku bands. This work provides an avenue to design high-performance EMW absorption devices based on MOF-derived nanomaterials.

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“…[6][7][8][9] As the prospective EMA materials, heteropoly polymetal MOFs with varied metal centers, and electronic and topological structures have always been a frontier topic in EM wave absorption (EMA). [10,11] In addition, using heteropolistic polymetal MOFs to prepare polymetallic/carbon-composite absorbers provides new possibilities for investigating novel efficient EMA materials. [12][13][14] Generally, the design of EMA materials concentrates on two factors: the construction of individual configurations and the selection of reasonable components.…”

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confidence: 99%

Oxygen Vacancy‐Induced Dielectric Polarization Prevails in the Electromagnetic Wave‐Absorbing Mechanism for Mn‐Based MOFs‐Derived Composites

Liu

Zhou

Jia

et al. 2022

Adv Funct Materials

260

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Polymeric metal-organic framework (MOF)-derived composites are promising functional materials because of their exceptional chemical homogeneity, designable components, and adjustable pore size. The modulation of oxygen and Mn vacancies via the introduction of heteroatoms and changes in the annealing temperature in MOFs-derived composites can be a possible solution to investigate the polarization loss mechanism, which facilitates the improvement of electromagnetic loss capacity. Herein, the design of laminate-stacked sphere-shaped trimetallic CoNiMn-MOFs is presented. The derived CoNi/ MnO@C composites retain the original topography of the MOFs. The concentration of oxygen vacancies increases with the incorporation of heteroatoms, but decreases with annealing temperature, which prevails in the polarization loss mechanism rather than the contribution of Mn 2+ vacancies and heterogeneous interfaces. Therefore, the minimum reflection loss of the CoNi/MnO@C sample demonstrates −55.2 dB at 2.6 mm and the broad effective absorption bandwidth reaches 8.0 GHz at 2.1 mm. This work is expected to provide meaningful insights into the significant effect of ion vacancy modulation on the EM wave-absorbing performance of Mn-based MOFs-derived composites.

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Fabrication of yolk-shell NiCo alloy@C composites derived from trimetallic metal–organic frameworks as light-weight and high-performance electromagnetic wave absorbers

Cited by 45 publications

References 39 publications

NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

Metal/N-Doped Carbon Nanoparticles Derived from Metal–Organic Frameworks for Electromagnetic Wave Absorption

Oxygen Vacancy‐Induced Dielectric Polarization Prevails in the Electromagnetic Wave‐Absorbing Mechanism for Mn‐Based MOFs‐Derived Composites

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Fabrication of yolk-shell NiCo alloy@C composites derived from trimetallic metal–organic frameworks as light-weight and high-performance electromagnetic wave absorbers

Cited by 45 publications

References 39 publications

NaBH4-Assisted Synthesis of B–(Ni–Co)/MgAl2O4 Nanostructures for the Catalytic Dry Reforming of Methane

NaBH4-Assisted Synthesis of B–(Ni–Co)/MgAl2O4 Nanostructures for the Catalytic Dry Reforming of Methane

Metal/N-Doped Carbon Nanoparticles Derived from Metal–Organic Frameworks for Electromagnetic Wave Absorption

Oxygen Vacancy‐Induced Dielectric Polarization Prevails in the Electromagnetic Wave‐Absorbing Mechanism for Mn‐Based MOFs‐Derived Composites

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Product

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NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane

NaBH₄-Assisted Synthesis of B–(Ni–Co)/MgAl₂O₄ Nanostructures for the Catalytic Dry Reforming of Methane