Yann Pellegrin

Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation

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Fabrice Odobel

Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation

125

Errol Blart

Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation

Denis Jacquemin

Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation

Mohammed Boujtita

Nantes Université

Aurélien Planchat

Centre National de la Recherche Scientifique

Leif Hammarström

Uppsala University

Yoann Farré

Nantes Université

Stéphane Jobic

Nantes Université

Laurent Cario

The University of Tokyo

Loïc Le Pleux

Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation

Cooperative Institutions

Centre National de la Recherche Scientifique

224

Nantes Université

Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation

Institut des Sciences Chimiques de Rennes

Laboratoire de Chimie

Université de Rennes

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Université Paris-Sud

Institut des Matériaux Jean Rouxel

Université Grenoble Alpes

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Challenging metal-ion rocking-chair and zinc-ion mechanisms in mild acidic to neutral aqueous electrolytes

Electrochemistry Communications (2023)

Arvinder Singh David Grenz Yann Pellegrin Fabrice Odobel Philippe Poizot

The utilization of 2,5-ditertbutyl hydroquinone (DTBHQ) as a potential active material in aqueous zinc-ion batteries (AZIBs) was studied for the first time. Thanks to its two hydrophobic groups, DTBHQ demonstrates a maximum solubility of 629 µM/L, significantly lower than that of other reported small quinone derivatives for AZIBs. This property translates to remarkable long-term capacity retention, even at a high electrolyte to active mass ratio. Significantly, our findings provide unequivocal support for a proton insertion mechanism as the main electrochemical process in the solid state in mono- and divalent aqueous electrolytes, thereby challenging the prevailing notion of metal-ion rocking-chair and zinc-ion mechanisms widely reported for aqueous batteries. This novel insight that holds for electrolytes based on metal- (K+, Zn2+ and Mg2+) and non-metal cations (NH4+ and NH3OH+) has profound implications for the understanding and development of aqueous batteries since the operating reduction potential was found to be directly proportional to the pKa values of the predominant acid/base couple of the tested aqueous electrolytes.

Hydroquinone

10.1016/j.elecom.2023.107559

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Citations (6)

Ruthenium polypyridyl peptide conjugates: membrane permeable probes for cellular imaging

Chemical Communications (2008)

Ute Neugebauer Yann Pellegrin Marc Devocelle Robert J. Forster William Signac

Two novel polyarginine labelled ruthenium polypyridyl dyes are reported, one conjugated to five, (Ru–Ahx–R5), and one to eight arginine residues, (Ru–Ahx–R8); both complexes exhibit long-lived, intense, and oxygen-sensitive luminescence; (Ru–R8) is passively, efficiently and very rapidly transported across the cell membrane into the cytoplasm without requirement for its permeablisation.

Conjugate

10.1039/b810403d

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Citations (141)

Study of Fluorine-doped SnO2 thin films with tunable Haze Factor

HAL (Le Centre pour la Communication Scientifique Directe) (2015)

S. Zhang G. Giusti Daniel Langley Stéphane Brochen M. Jouvet

Haze

Fluorine

Factor (programming language)

Source

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Long-Range Charge Separation in a Ferrocene–(Zinc Porphyrin)–Naphthalenediimide Triad. Asymmetric Role of 1,2,3-Triazole Linkers

The Journal of Physical Chemistry C (2013)

Mirco Natali Marcella Ravaglia Franco Scandola Julien Boixel Yann Pellegrin

New dyad and triad systems based on a zinc porphyrin (ZnP), a naphthalenediimide (NDI), and a ferrocene (Fc) as molecular components, linked by 1,2,3-triazole bridges, ZnP-NDI (3) and Fc-ZnP-NDI (4), have been synthesized. Their photophysical behavior has been investigated by both visible excitation of the ZnP chromophore and UV excitation of the NDI unit. Dyad 3 exhibits relatively inefficient quenching of the ZnP singlet excited state, slow charge separation, and fast charge recombination processes. Excitation of the NDI chromophore, on the other hand, leads to charge separation by both singlet and triplet quenching pathways, with the singlet charge-separated (CS) state recombining in a subnanosecond time scale and the triplet CS state decaying in ca. 90 ns. In the triad system 4, primary formation of the Fc-ZnP+-NDI– charge-separated state is followed by a secondary hole shift process from ZnP to Fc. The product of the stepwise charge separation, Fc+-ZnP-NDI–, undergoes recombination to the ground state in 1.9 μs. The charge-separated states are always formed more efficiently upon NDI excitation than upon ZnP excitation. DFT calculations on a bridge–acceptor fragment show that the bridge is expected to mediate a fast donor-to-bridge-to-acceptor electron cascade following excitation of the acceptor. More generally, triazole bridges may behave asymmetrically with respect to photoinduced electron transfer in dyads, kinetically favoring hole-transfer pathways triggered by excitation of the acceptor over electron-transfer pathways promoted by excitation of the donor.

Chromophore

Acceptor

Photoinduced charge separation

Photoinduced electron transfer

Electron acceptor

10.1021/jp406405k

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Citations (37)

Charge‐Transfer State and Large First Hyperpolarizability Constant in a Highly Electronically Coupled Zinc and Gold Porphyrin Dyad

Chemistry - A European Journal (2009)

Jérôme Fortage Annabelle Scarpaci Lydie Viau Yann Pellegrin Errol Blart

Abstract We report the synthesis and the characterizations of a novel dyad composed of a zinc porphyrin (ZnP) linked to a gold porphyrin (AuP) through an ethynyl spacer. The UV/Vis absorption spectrum and the electrochemical properties clearly reveal that this dyad exhibits a strong electronic coupling in the ground state as evidenced by shifted redox potentials and the appearance of an intense charge‐transfer band localized at λ =739 nm in dichloromethane. A spectroelectrochemical study of the dyad along with the parent homometallic system (i.e., ZnP–ZnP and AuP–AuP) was undertaken to determine the spectra of the reduced and oxidized porphyrin units. Femtosecond transient absorption spectroscopic analysis showed that the photoexcitation of the heterometallic dyad leads to an ultrafast formation of a charge‐separated state ( + ZnP–AuP . ) that displays a particularly long lifetime ( τ =4 ns in toluene) for such a short separation distance. The molecular orbitals of the dyad were determined by DFT quantum‐chemical calculations. This theoretical study confirms that the observed intense band at λ =739 nm corresponds to an interporphyrin charge‐transfer transition from the HOMO orbital localized on the zinc porphyrin to LUMO orbitals localized on the gold porphyrin. Finally, a Hyper–Rayleigh scattering study shows that the dyad possesses a large first molecular hyperpolarizability coefficient ( β =2100×10 −30 esu at λ =1064 nm), thus highlighting the valuable nonlinear optical properties of this new type of push–pull porphyrin system.

Hyperpolarizability

Superexchange

HOMO/LUMO

10.1002/chem.200900262

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Citations (34)

Transparent and colorless DSSCs featuring thienyl-pyrrolopyrrole cyanine sensitizers

Journal of Materials Chemistry A (2023)

Thibaut Baron Waad Main Máté Kurucz Ilias Nikolinakos Baptiste Andrin

Thanks to their red-shifted absorption spectra, thienyl-pyrrolopyrrole cyanine sensitizers are an appealing class of dyes for transparent dye sensitized solar cell technology.

Cyanine

10.1039/d3ta02043f

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Citations (3)

Wireless electrochemiluminescence at functionalised gold microparticles using 3D titanium electrode arrays

Chemical Communications (2021)

Samantha F. Douman D. A. Collins Loanda R. Cumba Stephen Beirne Gordon G. Wallace

Wireless electrochemiluminescence is generated from functionalised gold microparticles using interdigitated, 3D printed, titanium arrays as feeder electrodes. Active transport and intense electric fields leads to bright electrochemiluminescence.

Electrochemiluminescence

Titanium Dioxide

10.1039/d1cc01010g

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Citations (19)

Synthesis and properties of novel pyranylidene-based organic sensitizers for dye-sensitized solar cells

Dyes and Pigments (2019)

Sébastien Gauthier Françoise Robin-le Guen Laurianne Wojcik Nicolas Le Poul Aurélien Planchat

Moiety

Electron donor

Functional group

10.1016/j.dyepig.2019.107747

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Citations (19)

CuGaO2: a promising alternative for NiO in p-type dye solar cells

Journal of Materials Chemistry (2012)

Adèle Renaud Benoit Chavillon Loïc Le Pleux Yann Pellegrin Errol Blart

CuGaO2 is used here as photocathode in place of NiO for a p-type dye-sensitized solar cell with iodide/triiodide (I−/I3−) or tris(4,4′-bis-tert-butyl-2,2′-bipyridine)cobalt (Co2+/Co3+) as redox mediator, and PMI or PMI-NDI as sensitizer. Both photovoltaic characteristics and flat band potentials suggest that CuGaO2 can be viewed as a promising substitute for NiO.

Non-blocking I/O

Triiodide

Photocathode

10.1039/c2jm31908j

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Citations (114)

Engineering Processes at the Interface of p‐Semiconductor for Enhancing the Open Circuit Voltage in p‐Type Dye‐Sensitized Solar Cells

Advanced Energy Materials (2017)

Ludovic Favereau Yann Pellegrin Lionel Hirsch Adèle Renaud Aurélien Planchat

To prevent the interfacial charge recombination between injected holes in the valence band and the redox mediator in the electrolyte in p‐type dye sensitized solar cells (p‐DSSC) the passivation of the recombination sites by organic insulator chenodeoxycholic acid (CDCA) layer is critically investigated in this study. Rather than classical coating of the semiconductor's surface by simultaneous co‐adsorption of CDCA during the dyeing step, two other methods are investigated. The first consists in dissolving CDCA in the electrolyte, while the second consists in spin coating an ethanol solution of CDCA onto the already dyed photocathode. In this study, different sensitizers, electrolytes, and p‐SCs, (NiO, CuGaO 2 ) are explored. Analysis of the current/voltage curves and electrochemical impedance spectroscopy provides evidence that the role of the CDCA layer is to create a physical barrier to prevent the approach of the redox mediator from the NiO surface and consequently raise the open circuit voltage ( V oc ). The important finding of this study is the demonstration that the V oc in p‐DSSC is heavily limited by interfacial charge recombination and that higher V oc values much above 100 mV and as high as 500 mV can be attained with conventional materials (NiO) if this deleterious side reaction can be suppressed or diminished.

Open-circuit voltage

Non-blocking I/O

Passivation

10.1002/aenm.201601776

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Citations (41)