A One‐Pot Route to Faceted FePt‐Fe₃O₄ Dumbbells: Probing Morphology–Catalytic Activity Effects in O₂ Reduction Catalysis

Abstract

The design and synthesis of faceted nanoparticles with a controlled composition is of enormous importance to modern catalyst engineering. Faceted FePt‐Fe3O4 dumbbell nanoparticles are prepared by a simple, one‐pot technique that avoids the need for expensive additives or preformed seeds. The faceted product consists of an FePt octopod and a cubic Fe3O4 lobe, of mean diameter 13.6 and 14.9 nm, respectively. The mass normalized activity for electrocatalytic oxygen reduction shows that this new structure types outperforms related catalysts in alkaline media. This work illustrates the power of morphology control and tailoring crystal facet abundance at the nanoparticle surface for enhancing catalytic performance.

A reusable catalyst based on CuO hexapods and a CuO–Ag composite for the highly efficient reduction of nitrophenols

“…7,8 In particular, numerous works have reported the synthesis of noble metal nanoparticles (NPs), wires, rods and tubes. 9,10 These have been targeted for their remarkable physical and chemical features and have demonstrated applications in sensing, catalysis, biomedicine, therapy, and optical devices. Noble metal NPs (such as Au, Ag, Pd, etc.)…”

Multimode Electron Tomography Sheds Light on Synthesis, Structure, and Properties of Complex Metal‐Based Nanoparticles

“…[10,71,72] This intense research interest is owed to their superior properties, often observed specifically for anisotropic structures. [1,6,10,[62][63][64][65][73][74][75][76] Again, NP characterization to understand structure-activity relationships within these complex systems is a significant challenge.…”

“…

wide range of social and economic challenges. [1][2][3] Increasingly complex materials can be prepared for optimized application performance from a wealth of synthetic techniques, including surfactant-, seed-, and additive-mediated procedures, [4][5][6][7][8] which has directly challenged materials characterization to bridge the knowledge gap between synthesis and application performance. [3,[9][10][11] The crystallinity, surface faceting, morphology, as well as elemental distribution and oxidation state, have a profound influence upon nanomaterials properties; all of which can be understood by means of transmission electron microscopy (TEM).Electron tomography (ET) has become an indispensable technique for the 3D characterization of nanoparticles during the last decade.

…”

“…wide range of social and economic challenges. [1][2][3] Increasingly complex materials can be prepared for optimized application performance from a wealth of synthetic techniques, including surfactant-, seed-, and additive-mediated procedures, [4][5][6][7][8] which has directly challenged materials characterization to bridge the knowledge gap between synthesis and application performance. [3,[9][10][11] The crystallinity, surface faceting, morphology, as well as elemental distribution and oxidation state, have a profound influence upon nanomaterials properties; all of which can be understood by means of transmission electron microscopy (TEM).…”

Facile Aqueous–Phase Synthesis of Pd–FePt Core–Shell Nanoparticles for Methanol Oxidation Reaction

“…Thus, the incorporation of a transition metal can be a route to reducing the cost and increasing the catalytic performance [8,9]. Wheatley et al reported that bi-metallic alloy (FePt) nanoparticles comprising transition metal oxide (Fe 3 O 4 ) showed great oxygen reduction capability because of the donation of electron density from Fe 3 O 4 to Pt [10]. FePt-Fe 3 O 4 nanoparticles were synthesized using an organic solvent at a relatively high temperature (<200 • C) under argon atmosphere.…”