2022
DOI: 10.1021/acs.chemmater.2c00717
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Oxidative Self-Assembly of Au/Ag/Pt Alloy Nanoparticles into High-Surface Area, Mesoporous, and Conductive Aerogels for Methanol Electro-oxidation

Abstract: The ability to assemble nanoparticles (NPs) into functional nanostructures is critical for the advancement of nanoscience. However, common assembling techniques utilize organic ligands or biomolecules, which are detrimental for charge transport and interparticle coupling and impede the efficient integration of low-dimensional properties. Herein, we report a methodology for the self-supported assembly of ultrasmall (3−6 nm) Au/Ag/Pt alloy NPs into large, freestanding alloy superstructures (aerogels) that exhibi… Show more

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Cited by 25 publications
(23 citation statements)
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“…[6][7][8][9][10] Thus, these features enable metallic aerogels to amplify and outperform the activity of the original NPs. 11 Recently, a variety of metallic aerogels with Pt, Pd, Au, Ag, Cu and Ni components has been developed as highly efficient electrocatalysts towards different reactions, such as the oxygen reduction reaction (ORR), 3 oxygen evolution reaction, 4 carbon dioxide reduction reaction, 12,13 methanol oxidation reaction (MOR), 14,15 ethylene glycol oxidation, 16 and hydrogen evolution reaction, 17 for applications including water electrolysis and fuel cells. For instance, Du 18 and co-workers reported the construction of polyvinylpyrrolidone-modied Pd aerogels composed of 3D nanowire-like networks using laser-generated inorganic-saltstabilized metal nanoparticles, which greatly facilitated the progress of electrocatalytic ethanol oxidation and exhibited enhanced activity, as compared with the commercial Pd/C.…”
Section: Introductionmentioning
confidence: 99%
“…[6][7][8][9][10] Thus, these features enable metallic aerogels to amplify and outperform the activity of the original NPs. 11 Recently, a variety of metallic aerogels with Pt, Pd, Au, Ag, Cu and Ni components has been developed as highly efficient electrocatalysts towards different reactions, such as the oxygen reduction reaction (ORR), 3 oxygen evolution reaction, 4 carbon dioxide reduction reaction, 12,13 methanol oxidation reaction (MOR), 14,15 ethylene glycol oxidation, 16 and hydrogen evolution reaction, 17 for applications including water electrolysis and fuel cells. For instance, Du 18 and co-workers reported the construction of polyvinylpyrrolidone-modied Pd aerogels composed of 3D nanowire-like networks using laser-generated inorganic-saltstabilized metal nanoparticles, which greatly facilitated the progress of electrocatalytic ethanol oxidation and exhibited enhanced activity, as compared with the commercial Pd/C.…”
Section: Introductionmentioning
confidence: 99%
“…A trimetallic NPA is introduced by Arachchige et al 71 They assemble very small (3−6 nm) Au/Ag/Pt alloyed NPs into aerogels that exhibit a high surface area and superior electrocatalytic activity for the MOR. The precursor Au/Ag/ Pt alloy NPs and hydrogels were synthesized by a stepwise galvanic replacement reaction of glutathione-coated Ag-NPs, followed by oxidative removal of the ligands.…”
Section: ■ Catalysismentioning
confidence: 99%
“…17,18 They not only combine the individual characteristics of monolithic aerogel materials (e.g., high specific surface areas and open interconnected porosity) and noble metal NPs (e.g., catalytic and plasmonic activity) but also possess collective and improved properties, thus attracting great attention in recent years. 19,20 To date, remarkable contributions have been devoted to the synthesis of various mono-/ multimetallic aerogels and their application in electrocatalysis. 21−23 Prominent electrocatalytic activities of the NMAs with respect to the metal NPs and commercial catalysts have been well-reported in various reactions.…”
Section: Introductionmentioning
confidence: 99%
“…Noble metal aerogels (NMAs), derived from the preformed colloidal metal nanoparticles (NPs) and composed of the interfused nanowires/chains, are a new class of the aerogel family. , They not only combine the individual characteristics of monolithic aerogel materials (e.g., high specific surface areas and open interconnected porosity) and noble metal NPs (e.g., catalytic and plasmonic activity) but also possess collective and improved properties, thus attracting great attention in recent years. , To date, remarkable contributions have been devoted to the synthesis of various mono-/multimetallic aerogels and their application in electrocatalysis. Prominent electrocatalytic activities of the NMAs with respect to the metal NPs and commercial catalysts have been well-reported in various reactions. More interestingly, the highly branched, interfused nanowire structure of the NMAs endows them with inherent self-healing and flexible properties, which would be potentially applied as flexible sensing electrodes in wearable sensing applications. , For instance, a high-performance wearable biosensing platform has been first demonstrated by the highly porous Au hydrogels with the excellent electrocatalytic activity and flexibility for in situ monitoring of sweat glucose . Recently, considering the high cost and low abundance of the noble metals, it will be a great idea to introduce other components (e.g., carbon nanomaterials) into the NMAs to efficiently lower the cost, enrich the structural design, and enhance the activity. However, despite the concentrated achievements, the rational design of such integrated aerogels for wearable sensing applications has been rarely explored.…”
Section: Introductionmentioning
confidence: 99%