Looking for chiral recognition in photoinduced bimolecular electron transfer using ultrafast spectroscopy

Verma, Pragya; Nançoz, Christoph; Bosson, Johann; Labrador, Geraldine M.; Lacour, Jérôme; Vauthey, Eric

doi:10.1039/d3cp00760j

Cited by 2 publications

(2 citation statements)

References 70 publications

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“…Hence, we hypothesized that the Pt-catalyzed HER could be enhanced by an electronic effect through the contact interfaces with the π-conjugated BINOL nanocarriers. As Pt NPs contact BINOL molecules, the excited electrons in π* states by ambient thermal energy may likely promote the reactivity of Pt and thus enhance H 2 evolution. ,, The hypothesis scheme is described in Figure S1. In the syntheses of Pt-BINOL nanocomposites, Pt nanoparticles were formed through the thermal reduction of K 2 PtCl 4 (Figure S1a).…”

Section: Resultsmentioning

confidence: 99%

Pt-1,1′-Bi(2-Naphthol) Nanostructures for Electrochemical H₂ Evolution in Alkaline Media

Chang,

Lyu,

Tsai

et al. 2024

ACS Appl. Nano Mater.

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This work improved the sluggish kinetics in an alkaline medium's electrochemical hydrogen evolution reaction (HER) by introducing the π-conjugated electronic effect from rationally designed Pt-1,1′-bi(2-naphthol) (BINOL) hybrid nanocomposites. The inorganic−organic hybrid nanocomposites were aqueously synthesized by a facile one-pot approach upon modulation of the surfactant concentration to precisely control the morphology in organic BINOL entities. This protocol led to different geometric nanostructures, including spheres (Pt-BINOL nanospheres) and lamellar flakes (Pt-BINOL nanoflakes), which allowed for fine-tuning of the d-band states of Pt NPs in the hybrid nanocomposites. In the two kinds of Pt-BINOL nanocomposites, the nanoflakes exhibited a low overpotential (24 mV) at the current density of 10 mA•cm −2 and the Tafel slope (19.1 mV dec −1 ), showing a superior HER efficiency not only much better than the nanospheres and the Pt/C catalyst but also comparable to the HER electrocatalysts in the late literature, with the lowest charge-transfer resistance (R ct ) 11.1 Ω and 1.12% of Pt-weight loading revealing that the Pt-BINOL nanoflakes are a cost-efficient electrocatalyst in alkaline HER. In conclusion, engineering the spatial arrangement of Pt NPs over the π-conjugated BINOL nanocarriers to enhance the Pt-catalyzed HER is important in developing efficient inorganic−organic hybrid nanostructures for generating H 2 energy.

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Section: Resultsmentioning

confidence: 99%

Pt-1,1′-Bi(2-Naphthol) Nanostructures for Electrochemical H₂ Evolution in Alkaline Media

Chang,

Lyu,

Tsai

et al. 2024

ACS Appl. Nano Mater.

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“…To investigate the electronic interaction, we specifically examined the epoxy/copper interface as a model system, considering its pivotal role in ensuring the reliability of electronic device packaging. Once excited species such as an excimer and an exciplex − of adhesive molecules, epoxy resin in this case, can be formed, they enable us to gain direct access to electronic states. In the following, we initially examined the electronic interaction between epoxy and copper (Cu) using density functional theory (DFT) calculations to validate the above-mentioned hypothesis.…”

Section: Introductionmentioning

confidence: 99%

Electronic Interaction of Epoxy Resin with Copper at the Adhered Interface

Saeki,

Kawaguchi,

Tsuji

et al. 2024

Langmuir

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A better understanding of the aggregation states of adhesive molecules in the interfacial region with an adherend is crucial for controlling the adhesion strength and is of great inherent academic interest. The adhesion mechanism has been described through four theories: adsorption, mechanical, diffusion, and electronic. While interfacial characterization techniques have been developed to validate the aforementioned theories, that related to the electronic theory has not yet been thoroughly studied. We here directly detected the electronic interaction between a commonly used thermosetting adhesive, cured epoxy of diglycidyl ether of bisphenol A (DGEBA) and 4,4′-diaminodiphenylmethane (DDM), and copper (Cu). This study used a combination of density functional theory (DFT) calculations and femtosecond transient absorption spectroscopic (TAS) measurements as this epoxy adhesive-Cu pairing is extensively used in electronic device packaging. The DFT calculations predicted that π electrons in a DDM molecule adsorbed onto the Cu surface flowed out onto the Cu surface, resulting in a positive charge on the DDM. TAS measurements for the Cu/epoxy multilayer film, a model sample containing many metal/adhesive interfaces, revealed that the electronic states of excited DDM moieties at the Cu interface were different from those in the bulk region. These results were in good accordance with the prediction by DFT calculations. Thus, it can be concluded that TAS is applicable to characterize the electronic interaction of adhesives with metal adherends in a nondestructive manner.

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Looking for chiral recognition in photoinduced bimolecular electron transfer using ultrafast spectroscopy

Abstract: Occurrence of chiral recognition in bimolecular photoinduced electron transfer (ET) is difﬁcult to identify because of the predominant role of diffusion. To circumvent this problem, we apply a combination of...

Cited by 2 publications

References 70 publications

Pt-1,1′-Bi(2-Naphthol) Nanostructures for Electrochemical H₂ Evolution in Alkaline Media

Pt-1,1′-Bi(2-Naphthol) Nanostructures for Electrochemical H₂ Evolution in Alkaline Media

Electronic Interaction of Epoxy Resin with Copper at the Adhered Interface

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Looking for chiral recognition in photoinduced bimolecular electron transfer using ultrafast spectroscopy

Abstract: Occurrence of chiral recognition in bimolecular photoinduced electron transfer (ET) is difﬁcult to identify because of the predominant role of diffusion. To circumvent this problem, we apply a combination of...

Cited by 2 publications

References 70 publications

Pt-1,1′-Bi(2-Naphthol) Nanostructures for Electrochemical H2 Evolution in Alkaline Media

Pt-1,1′-Bi(2-Naphthol) Nanostructures for Electrochemical H2 Evolution in Alkaline Media

Electronic Interaction of Epoxy Resin with Copper at the Adhered Interface

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Product

Resources

About

Pt-1,1′-Bi(2-Naphthol) Nanostructures for Electrochemical H₂ Evolution in Alkaline Media

Pt-1,1′-Bi(2-Naphthol) Nanostructures for Electrochemical H₂ Evolution in Alkaline Media