Synthesis of Pd-coated FeCo@Fe/C core–shell nanoparticles: microwave-induced ‘top-down’ nanostructuring and decoration

Abstract

We report a novel microwave-induced fast and efficient synthesis of sub-10 nm sized palladium-decorated FeCo@Fe core-shell nanoparticles (ca. 3-7 nm) from a large-sized FeCo@Fe (0.21-1.5 μm) precursor, suggesting 'top-down' nanosizing. The high electrochemical surface area, tolerance to methanol during oxygen reduction reaction, and the excellent stability of FeCo@Fe@Pd in alkaline electrolytes indicate that this nanomaterial may find future applications in Pd-based catalysis and/or alkaline fuel cells.

Enhanced methanol oxidation and oxygen reduction reactions on palladium-decorated FeCo@Fe/C core–shell nanocatalysts in alkaline medium

“…15 First, the FeCo/C catalyst was synthesized by a simple reduction method. 0.3650 mg (1.5 mmol) of CoCl 2 Á6H 2 O and 0.5302 mg of FeCl 2 Á4H 2 O were dissolved in 20 mL of triply-distilled deionized water, and then 150 mg of Vulcan XC-72 carbon support were dispersed in it.…”

“…Core-shell structures have been prepared using techniques such as chemical leaching of the non-noble materials, include fabrication of large core-shell nanoparticles with 20-50 nm diameter size. 14 In a recent communication, 15 we reported the synthesis of Pd-based ternary core-shell nanoparticles (FeCo@Fe@Pd/C) with sub-10 nm diameter size using a facile technique called ''microwave-induced top-down nanostructuring and decoration'' (abbreviated 'MITNAD' for simplicity). The MITNAD technique simply involves the use of fast microwave irradiation for a one-step top-down nanosizing of large-sized soft magnetic FeCo@Fe/C core-shell material (0.21-1.5 mm) to sub-10 nm sized Pd-decorated structure, FeCo@Fe@Pd/C (ca.…”

Electro-oxidation of ethylene glycol and glycerol at palladium-decorated FeCo@Fe core–shell nanocatalysts for alkaline direct alcohol fuel cells: functionalized MWCNT supports and impact on product selectivity

“…[33][34][35] In the present study, MWCNT-COOH and MWCNT-SO 3 H are used as supports rather than the Vulcan XC-72. First, FeCo@Fe/MWCNT-COOH and FeCo@Fe/MWCNT-SO 3 H core-shell nanoalloys were obtained by a simple reduction method via hydrogenation.…”

“…Recently, we introduced Pd-based ternary core-shell with a bimetallic (FeCo) core supported on commercial Vulcan carbon XC-72 (i.e., FeCo@Fe@Pd/C) via "microwave-induced top-down nanostructuring and decoration" (MITNAD) strategy. [33][34][35] The MITNAD strategy is simply the adoption of fast microwave irradiation for a one-step top-down nanosizing of large-sized soft magnetic FeCo@Fe/C core-shell material (0.21-1.5 microns) to sub-10 nm sized Pd-coated structure, FeCo@Fe@Pd/C. In the present work, we have interrogated the use of two differently chemically-functionalized multi-walled carbon nanotubes (MWCNTs) bearing mainly the -COOH or -SO 3 H surface groups (abbreviated herein as MWCNT-COOH and MWCNT-SO 3 H, respectively), as supporting platforms for the FeCo@Fe@Pd catalyst.…”

Plant‐Mediated Biogenic Synthesis of Palladium Nanoparticles: Recent Trends and Emerging Opportunities

“…Although the synthesis of palladium nanoparticles has been studied extensively, controlled fabrication of their bimetallic structures is more complicated. Physical (e.g., sputtering, argon glow discharge, and laser irradiation), chemical (e.g., chemical/sonochemical reduction and polyol), electrochemical and radiation (e.g., microwave and g radiation) methods are common for the fabrication of palladium based bimetallic nanomaterials [149,[153][154][155][156][157][158][159][160][161]. Recently, bio-inspired reduction processes utilizing plant extracts [36,[162][163][164] as well as microbes [165,166] as the key source are becoming popular.…”