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A greener approach to synthesizing metal-decorated carbogels from alginate for emerging technologies
Citation Link: https://doi.org/10.15480/882.8726
Publikationstyp
Journal Article
Date Issued
2023
Sprache
English
Author(s)
Universidad de Valladolid
University of Debrecen
University of Debrecen
University of Debrecen
Bermejo, María Dolores
Universidad de Valladolid
Martín, Ángel
Universidad de Valladolid
TORE-DOI
Journal
Volume
5
Start Page
6635
End Page
6646
Citation
Nanoscale Advances 5: 6635–6646 (2023)
Publisher DOI
Scopus ID
Publisher
Royal Society of Chemistry
In the present work, a series of metal nanoparticle-decorated carbogels (M-DCs) was synthesized starting from beads of parent metal-crosslinked alginate aerogels (M-CAs), comprising Ca(II), Ni(II), Cu(II), Pd(II) and Pt(lV) ions, followed by pyrolysis under N2 atmosphere up to pyrolysis temperatures of TP = 600 ºC. The textural properties of M-CAs are found to depend on the crosslinking ion, yielding
fibrous pore networks with high specific mesoporous volume and specific surface area SV (SV ~ 480 – 687 m2/g) for M-CAs crosslinked with hard cations, Ca(II), Ni(II) and Cu(II), and comparably loose
networks with increased macroporosity and lower specific surface (SV ~ 240 – 270 m2/g) for Pd(II) and Pt(IV) crosslinked aerogels. The pyrolysis of M-CAs resulted in two simultaneously occurring processes: changes of the solid backbone and the growth of metal/metal oxide nanoparticles (NPs). The thermogravimetric analysis (TGA) showed a significant influence of the crosslinking cation on the
decomposition mechanism and associated change of textural properties. Backscattered electron scanning electron microscopy imaging (SEM-BSE) and X-ray diffraction revealed that metal ions (molecularly dispersed in the parent aerogels) formed nanoparticles composed of elementary metals and metal oxides in varying ratios over the course of pyrolytic treatment. Increasing the TP led to in generally larger nanoparticles. The pyrolysis of the nickel-crosslinked aerogel (Ni-CA) preserved to a large extent the mesoporous structure and resulted in the evolution of fine (~ 14 nm) homogeneously dispersed Ni/NiO nanoparticles. Overall, this work presents a green approach for synthesizing metal-nanoparticle containing carbon materials, useful in emerging technologies related to heterogeneous
catalysis, electrocatalysis among others.
fibrous pore networks with high specific mesoporous volume and specific surface area SV (SV ~ 480 – 687 m2/g) for M-CAs crosslinked with hard cations, Ca(II), Ni(II) and Cu(II), and comparably loose
networks with increased macroporosity and lower specific surface (SV ~ 240 – 270 m2/g) for Pd(II) and Pt(IV) crosslinked aerogels. The pyrolysis of M-CAs resulted in two simultaneously occurring processes: changes of the solid backbone and the growth of metal/metal oxide nanoparticles (NPs). The thermogravimetric analysis (TGA) showed a significant influence of the crosslinking cation on the
decomposition mechanism and associated change of textural properties. Backscattered electron scanning electron microscopy imaging (SEM-BSE) and X-ray diffraction revealed that metal ions (molecularly dispersed in the parent aerogels) formed nanoparticles composed of elementary metals and metal oxides in varying ratios over the course of pyrolytic treatment. Increasing the TP led to in generally larger nanoparticles. The pyrolysis of the nickel-crosslinked aerogel (Ni-CA) preserved to a large extent the mesoporous structure and resulted in the evolution of fine (~ 14 nm) homogeneously dispersed Ni/NiO nanoparticles. Overall, this work presents a green approach for synthesizing metal-nanoparticle containing carbon materials, useful in emerging technologies related to heterogeneous
catalysis, electrocatalysis among others.
Subjects
aerogels
alginate crosslinking
carbogels
green chemistry
metallic-clusters evolution
pyrolysis treatment
DDC Class
540: Chemistry
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