Generation of high-density nanoparticles in the carbothermal shock method

Song, Ji‐Yoon; Kim, Chansol; Kim, Minki; Cho, Kyeong Min; Gereige, Issam; Jung, Woo‐Bin; Jeong, Hyeonsu; Jung, Hee‐Tae

doi:10.1126/sciadv.abk2984

Cited by 27 publications

(26 citation statements)

References 47 publications

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“…The partial carbonization of cellulose in the sponge during the CTS process generates large defect sites, resulting in uniform and dense formation of RuCu NPs. [ 23 ] Homogeneous mixing of Ru and Cu components in RuCu NPs could be confirmed by the TEM energy‐dispersive spectroscopy (EDS) mapping image, which shows no segregated regions of each element (Figure 1D). A line scan profile from TEM‐EDS additionally demonstrates the uniform distribution of Ru and Cu atoms in the RuCu NP (Figure S5, Supporting Information).…”

Section: Resultsmentioning

confidence: 89%

Atomic‐Scale Homogeneous RuCu Alloy Nanoparticles for Highly Efficient Electrocatalytic Nitrogen Reduction

et al. 2022

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Ruthenium (Ru) is the most widely used metal as an electrocatalyst for nitrogen (N2) reduction reaction (NRR) because of the relatively high N2 adsorption strength for successive reaction. Recently, it has been well reported that the homogeneous Ru‐based metal alloys such as RuRh, RuPt, and RuCo significantly enhance the selectivity and formation rate of ammonia (NH3). However, the metal combinations for NRR have been limited to several miscible combinations of metals with Ru, although various immiscible combinations have immense potential to show high NRR performance. In this study, an immiscible combination of Ru and copper (Cu) is first utilized, and homogeneous alloy nanoparticles (RuCu NPs) are fabricated by the carbothermal shock method. The RuCu homogeneous NP alloys on cellulose/carbon nanotube sponge exhibit the highest selectivity and NH3 formation rate of ≈31% and −73 μmol h−1 cm−2, respectively. These are the highest values of the selectivity and NH3 formation rates among existing Ru‐based alloy metal combinations.

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Section: Resultsmentioning

confidence: 89%

Atomic‐Scale Homogeneous RuCu Alloy Nanoparticles for Highly Efficient Electrocatalytic Nitrogen Reduction

et al. 2022

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“…Reproduced with permission. [ 68 ] Copyright 2021, American Association for Advancement of Science. d) Schematic illustration of the fly‐through high‐temperature reactor and the thermal decomposition of metal salt precursors into metallic nanoparticles anchored on carbon black.…”

Section: Carbon/metal Hybrid Structuresmentioning

confidence: 99%

“…This method can also be applied to multielement alloy metal nanoparticles. [ 68 ] Another recent development is a continuous fly‐through reactor designed for continuous catalyst synthesis. As shown in Figure 4d, metal salt precursors flow between two heated carbon sheets 1–3 mm apart under gravity and the carrier gas.…”

Section: Carbon/metal Hybrid Structuresmentioning

confidence: 99%

“…The ultrafast heating methods used to synthesize monometallic nanoparticles can also synthesize alloy nanoparticles by adding multiple metal precursors, as in several studies discussed in the previous subsection. [25,26,68] Furthermore, Chen et al reported well-dispersed bimetallic Pd and Ni alloy nanoparticles supported on CNFs with good elemental mixing and uniform particle distribution. They achieved the fine tunings of the alloy nanoparticles' average size, chemical composition, and morphologies by controlling the chemical composition of metal precursors.…”

Section: Carbon-supported Monometallic Nanoparticlesmentioning

confidence: 99%

“…c) Schematic illustration of Cu nanoparticle synthesis on carbolized carbon paper using a cellulose coating. Reproduced with permission [68]. Copyright 2021, American Association for Advancement of Science.…”

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Carbon and Carbon/Metal Hybrid Structures Enabled by Ultrafast Heating Methods

Lai

Deng

et al. 2022

Small Structures

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Figure 3. a) Schematic illustration of the SPS system (top) and the heating mechanism (bottom). Reproduced with permission. [48] Copyright 2022, National Academy of Sciences. b) Schematic illustration and photo of the soldering of two overlapped CNT fibers. Reproduced with permission. [55] Copyright 2017, Elsevier. c) Schematic illustration of polymer-coated CNTs welded via ultrafast heating and a photo of the heated CNF film (top) and SEM images of CNTs before and after welding (bottom). Reproduced with permission. [6] Copyright 2018, American Chemical Society. d) Schematic illustration and an SEM image of CNTs formed inside confined spaces of carbonized wood. Reproduced with permission. [61] Copyright American Association for Advancement of Science. e) Schematic illustration of a roll-to-roll process to produce welded CNT/glass fibers (left), two photos, and an IR image of heated CNT/glass fibers (right). Reproduced with permission.

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Ultra‐Fast Pulsed Discharge Preparation of Coordinatively Unsaturated Asymmetric Copper Single‐Atom Catalysts for CO₂ Reduction

Liu,

Sun,

Chen

et al. 2024

Adv Funct Materials

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Single‐atom catalysts possess great potential for applications in electrochemical carbon dioxide reduction reactions. Recently, the fast and low‐cost preparation of highly efficient single‐atom catalysts remains a challenge. Herein, a high‐density current generated by pulsed discharge is employed for the formation of graphene aerogel anchored Cu single atom catalysts perfectly. The Cu atoms decomposed by Cu(NO3)2•xH2O are fixed on graphene under the local transient high temperature and intense electromagnetic field. The activity and selectivity of formic acid are correlated with the coordinatively unsaturated Cu─N1O1 moieties, reaching an optimal Faradaic efficiency (93.7%) at −0.9 V versus a reversible hydrogen electrode (RHE). In situ characterizations reveal that the asymmetric Cu─N/O structure in a pinched state displays better catalytic activity in CO2RR. Density functional theory results indicate that the Cu─N1O1 sites regulate the adsorption configuration of intermediates and lower the energy barrier for the hydrogenation of *OCHO species, thereby promoting CO2‐to‐HCOOH conversion.

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Generation of high-density nanoparticles in the carbothermal shock method

Abstract: Carbothermal shock can produce a high surface coverage of metal nanoparticles by introducing cellulose.

Cited by 27 publications

References 47 publications

Atomic‐Scale Homogeneous RuCu Alloy Nanoparticles for Highly Efficient Electrocatalytic Nitrogen Reduction

Atomic‐Scale Homogeneous RuCu Alloy Nanoparticles for Highly Efficient Electrocatalytic Nitrogen Reduction

Carbon and Carbon/Metal Hybrid Structures Enabled by Ultrafast Heating Methods

Ultra‐Fast Pulsed Discharge Preparation of Coordinatively Unsaturated Asymmetric Copper Single‐Atom Catalysts for CO₂ Reduction

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Generation of high-density nanoparticles in the carbothermal shock method

Abstract: Carbothermal shock can produce a high surface coverage of metal nanoparticles by introducing cellulose.

Cited by 27 publications

References 47 publications

Atomic‐Scale Homogeneous RuCu Alloy Nanoparticles for Highly Efficient Electrocatalytic Nitrogen Reduction

Atomic‐Scale Homogeneous RuCu Alloy Nanoparticles for Highly Efficient Electrocatalytic Nitrogen Reduction

Carbon and Carbon/Metal Hybrid Structures Enabled by Ultrafast Heating Methods

Ultra‐Fast Pulsed Discharge Preparation of Coordinatively Unsaturated Asymmetric Copper Single‐Atom Catalysts for CO2 Reduction

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Ultra‐Fast Pulsed Discharge Preparation of Coordinatively Unsaturated Asymmetric Copper Single‐Atom Catalysts for CO₂ Reduction