A general strategy for colloidal stable ultrasmall amorphous mineral clusters in organic solvents

Sun, Shengtong; Gebauer, Denis; Cölfen, Helmut

doi:10.1039/c6sc02333a

Cited by 25 publications

(23 citation statements)

References 41 publications

(51 reference statements)

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“…The high‐resolution TEM (HRTEM) image (inset of Figure a) of a‐Cu exhibits the amorphous nature, while the image of c‐Cu (inset of Figure b) reveals a lattice spacing of about 0.181 nm for c‐Cu, corresponding to (200) plane of Cu, which are well consistent with the XRD results. Moreover, the corresponding selected area electron diffraction (SAED) patterns prove the amorphous feature of a‐Cu with very ambiguous diffuse halo ring (Figure e), and the crystalline c‐Cu with very distinct rings (Figure f), agrees very well with their XRD results (Figure b).…”

supporting

confidence: 78%

“…In our work, the obtained Tafel slope for HCOOH of 111 mV dec −1 implies the initial single e − transfer step, which is illustrated by Equation , is the RDS of HCOOH for CO 2 reduction on a‐Cu. In the case of C 2 H 6 O production over a‐Cu, a slope of 216 mV dec −1 (Figure S8, Supporting Information) illustrates that, it shares the same RDS with HCOOH (Equation ) . The production steps of C 2 H 6 O share the same first two steps with HCOOH.…”

mentioning

confidence: 88%

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Amorphizing of Cu Nanoparticles toward Highly Efficient and Robust Electrocatalyst for CO₂ Reduction to Liquid Fuels with High Faradaic Efficiencies

et al. 2018

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Conversion of carbon dioxide (CO ) into valuable chemicals, especially liquid fuels, through electrochemical reduction driven by sustainable energy sources, is a promising way to get rid of dependence on fossil fuels, wherein developing of highly efficient catalyst is still of paramount importance. In this study, as a proof-of-concept experiment, first a facile while very effective protocol is proposed to synthesize amorphous Cu NPs. Unexpectedly, superior electrochemical performances, including high catalytic activity and selectivity of CO reduction to liquid fuels are achieved, that is, a total Faradaic efficiency of liquid fuels can sum up to the maximum value of 59% at -1.4 V, with formic acid (HCOOH) and ethanol (C H O) account for 37% and 22%, respectively, as well as a desirable long-term stability even up to 12 h. More importantly, this work opens a new avenue for improved electroreduction of CO based on amorphous metal catalysts.

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confidence: 78%

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confidence: 88%

Amorphizing of Cu Nanoparticles toward Highly Efficient and Robust Electrocatalyst for CO₂ Reduction to Liquid Fuels with High Faradaic Efficiencies

et al. 2018

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“…Firstly, certain additives capture clusters of atoms, molecules and ions, inhibiting further coalescence. This ‘divide and protect’ stabilization is illustrated by thiolate‐protected gold clusters as well as 10,12‐pentacosadiynoic acid protected mineral clusters ,,. Here the overall structure and energetics of nanoclusters are related to the chemical nature of the ligand and also the distinct arrangements of the core and the core‐shell interface (Figure a).…”

Section: Pathways To Complex Organizations Of Mattermentioning

confidence: 99%

From Solute, Fluidic and Particulate Precursors to Complex Organizations of Matter

Rao

Cölfen

2018

The Chemical Record

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The organization of matter from its constitutive units recruits intermediate states with distinctive degrees of self-association and molecular order. Existing as clusters, droplets, gels as well as amorphous and crystalline nanoparticles, these precursor forms have fundamental contributions towards the composition and structure of inorganic and organic architectures. In this personal account, we show that the transitions from atoms, molecules or ionic species to superstructures of higher order are intertwined with the interfaces and interactions of precursor and intermediate states. Structural organizations distributed across different length scales are explained by the multistep nature of nucleation and crystallization, which can be guided towards functional hybrid materials by the strategic application of additives, templates and reaction environments. Thus, the non-classical pathways for material formation and growth offer conceptual frameworks for elucidating, inducing and directing fascinating material organizations of biogenic and synthetic origins.

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“…Der Stabilisierungsmechanismus von Mineralclustern durch PCDA wurde von uns in Lit. diskutiert. TEM‐Aufnahmen zeigen, dass die AIO‐PCDA‐Cluster mit einer durchschnittlichen Größe von 2.6 nm relativ isoliert vorliegen (Abbildung d–f).…”

Section: Figureunclassified

Ausrichtung amorpher Eisenoxid‐Cluster: ein nichtklassischer Mechanismus für die Magnetitbildung

2017

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Obwohl schon viele Studien auf dem Gebiet der Nukleation und Kristallisation von Eisen(oxyhydr)oxiden durchgeführt wurden, ist die Rolle der Spezies,die sich in den frühen Stadien entwickeln, besonders primäre Cluster und amorphe Übergangspartikel, immer nochschlecht verstanden. Hier wurden sowohl ligandenfreie als auchligandengeschützte amorphe Eisenoxid-Cluster ("amorphous iron oxide", AIO, < 2nm) als Vorstufen fürd ie Magnetitbildung synthetisiert. DurchT empern kçnnen die Cluster zu Magnetitpartikeln kristallisieren, und es wurde festgestellt, dass die AIO-Bulkphase mit Domänen von vororientierten Clustern eine direkte Vorstufe zum Kristall ist. Dies weist auf einen nichtklassischen aggregationsbasierten Reaktionspfad hin, welcher sich von der bisher berichteten orientierten Anlagerung oder dem Partikelanlagerungsmechanismus unterscheidet.

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A general strategy for colloidal stable ultrasmall amorphous mineral clusters in organic solvents

Abstract: A general gas diffusion strategy using 10,12-pentacosadiynoic acid as a ligand and ethanol as a solvent was developed to fabricate stable amorphous mineral clusters with a core size of less than 2 nm.

Cited by 25 publications

References 41 publications

Amorphizing of Cu Nanoparticles toward Highly Efficient and Robust Electrocatalyst for CO₂ Reduction to Liquid Fuels with High Faradaic Efficiencies

Amorphizing of Cu Nanoparticles toward Highly Efficient and Robust Electrocatalyst for CO₂ Reduction to Liquid Fuels with High Faradaic Efficiencies

From Solute, Fluidic and Particulate Precursors to Complex Organizations of Matter

Ausrichtung amorpher Eisenoxid‐Cluster: ein nichtklassischer Mechanismus für die Magnetitbildung

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A general strategy for colloidal stable ultrasmall amorphous mineral clusters in organic solvents

Abstract: A general gas diffusion strategy using 10,12-pentacosadiynoic acid as a ligand and ethanol as a solvent was developed to fabricate stable amorphous mineral clusters with a core size of less than 2 nm.

Cited by 25 publications

References 41 publications

Amorphizing of Cu Nanoparticles toward Highly Efficient and Robust Electrocatalyst for CO2 Reduction to Liquid Fuels with High Faradaic Efficiencies

Amorphizing of Cu Nanoparticles toward Highly Efficient and Robust Electrocatalyst for CO2 Reduction to Liquid Fuels with High Faradaic Efficiencies

From Solute, Fluidic and Particulate Precursors to Complex Organizations of Matter

Ausrichtung amorpher Eisenoxid‐Cluster: ein nichtklassischer Mechanismus für die Magnetitbildung

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About

Amorphizing of Cu Nanoparticles toward Highly Efficient and Robust Electrocatalyst for CO₂ Reduction to Liquid Fuels with High Faradaic Efficiencies

Amorphizing of Cu Nanoparticles toward Highly Efficient and Robust Electrocatalyst for CO₂ Reduction to Liquid Fuels with High Faradaic Efficiencies