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Hubert Girault

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Publications associées (430)

Decamethylruthenocene Hydride and Hydrogen Formation at Liquid|Liquid Interfaces

Hubert Girault, Manuel Alejandro Méndez Agudelo, Thomas James Stockmann, Micheal Diarmaid Scanlon, Pekka Eero Peljo, Lucie Josette Renée Rivier

The formation and the dissociation of metal hydrides are key steps within the hydrogen evolution reaction (HER) pathway for photochemical water splitting, but also impacts a wide range of other catalytic, industrial, and biochemical reactions. Herein, we d ...

American Chemical Society2015

Bioanalytical methods for food allergy diagnosis, allergen detection and new allergen discovery

Hubert Girault, Natalia Gasilova

For effective monitoring and prevention of the food allergy, one of the emerging health problems nowadays, existing diagnostic procedures and allergen detection techniques are constantly improved. Meanwhile, new methods are also developed, and more and mor ...

Future Sci Ltd2015

A Simple Liquid-Liquid Biphasic System for Hydrogen Peroxide Generation

Hubert Girault, Gunther Wittstock

Although electron transfer reactions at liquid liquid interfaces have been thoroughly studied in the presence of deliberately added potential determining ions or phase transfer catalysts, little is known about these reactions in the absence of the above sp ...

American Chemical Society2015

Catalysis of water oxidation in acetonitrile by iridium oxide nanoparticles

Hubert Girault, Véronique Amstutz, Manuel Alejandro Méndez Agudelo, Heron Vrubel, Micheal Diarmaid Scanlon, Jonnathan Cesar Hidalgo Acosta

Water oxidation catalysed by iridium oxide nanoparticles (IrO2 NPs) in water–acetonitrile mixtures using [RuIII(bpy)3]3+ as oxidant was studied as a function of the water content, the acidity of the reaction media and the catalyst concentration. It was obs ...

2015

Multiple scanning electrochemical microscopy mapping of tyrosinase in micro-contact printed fruit samples on polyvinylidene fluoride membrane

Hubert Girault, Fernando Cortes Salazar, Liang Qiao, Andreas Stephan Lesch, Alexandra Bondarenko, Tzu-En Lin

Herein, we introduce three orthogonal and compatible methods for detecting tyrosinase, a key factor in fruit browning and skin disorders, with high spatial resolution by means of scanning electrochemical microscopy (SECM). All methods are performed subsequ ...

Elsevier2015

Macroscopic indicators of fault diagnosis and ageing in electrochemical double layer capacitors

Hubert Girault, Mario Paolone, Véronique Amstutz, Kathryn Ellen Toghill, Dimitri Torregrossa

The ageing behaviour of electric double layer (EDLC) supercapacitors during over-temperature and over-voltage stresses is described. Specific experimental tests were carried out in order to reproduce, under laboratory controlled conditions, the above-menti ...

2015

Chaotropic Agents Boosting the Performance of Photo-ionic Cells

Hubert Girault, Jelissa Risse, Manuel Alejandro Méndez Agudelo, Heron Vrubel, Astrid Johana Olaya Avendano, Pekka Eero Peljo, Romain Bourdon

Photo-ionic cells are a simple and scalable concept for direct solar energy storage, where the redox fuels produced by the photoreaction are separated in different phases to prevent recombination. The presence of chaotropic agents such as urea, that break ...

Amer Chemical Soc2015

Ambient in situ analysis and imaging of both hydrophilic and hydrophobic thin layer chromatography plates by electrostatic spray ionization mass spectrometry

Hubert Girault, Liang Qiao, Xiaoqin Zhong

Electrostatic spray ionization (ESTASI) mass spectrometry imaging (MSI), recently developed to profile spatial distribution of chemical and biochemical molecules on an insulating surface under ambient conditions, has been applied to identify and quantify c ...

RSC Publishing2015

Porous silica enhanced proteolysis during Off-Gel separation for efficient protein identification

Hubert Girault, Mohammad Reza Pourhaghighi, Liang Qiao

An advanced approach is developed in this work for simultaneous on-line separation and digestion of proteins by combining the Off-Gel isoelectric focusing (IEF) and enzymatic nanoreactor enhanced proteolysis. The nanoreactor was prepared by preloading tryp ...

Elsevier2015

Oxygen Reduction at Soft Interfaces Catalyzed by In Situ-Generated Reduced Graphene Oxide

Hubert Girault, Fernando Cortes Salazar, Véronique Amstutz, Haiqiang Deng, Micheal Diarmaid Scanlon

Face to face: Flakes of reduced graphene oxide, synthesized in situ at the liquid/liquid interface from a graphene-oxide precursor, are capable of catalyzing the biphasic reduction of protons to hydrogen peroxide in the presence of molecular oxygen and an ...

Wiley-V C H Verlag Gmbh2014

Role of electrolytes in vanadium-cerium flow batteries

Hubert Girault, Véronique Amstutz, Pekka Eero Peljo, Kathryn Ellen Toghill

Amer Chemical Soc2014

Standard addition strip for quantitative electrostatic spray ionization mass spectrometry analysis: Determination of caffeine in drinks

Hubert Girault, Christophe Roussel, Liang Qiao, Elena Tobolkina

Standard addition strips were prepared for the quantitative determination of caffeine in different beverages by electrostatic spray ionisation mass spectrometry (ESTASI-MS). The gist of this approach is to dry spots of caffeine solutions with different con ...

Elsevier2014

Photo-Ionic Cells: Two Solutions to Store Solar Energy and Generate Electricity on Demand

Hubert Girault, Manuel Alejandro Méndez Agudelo, Heron Vrubel, Micheal Diarmaid Scanlon, Pekka Eero Peljo

A solar energy conversion concept based on the photo-induced separation of a pair of redox species in a biphasic liquid cell is presented. The redox pair is subsequently discharged in an electrochemical flow cell to generate electricity. To illustrate this ...

Amer Chemical Soc2014

Electrochemical oxygen reduction at soft interfaces catalyzed by the transfer of hydrated lithium cations

Hubert Girault, Haiqiang Deng, Thomas James Stockmann, Pekka Eero Peljo

The oxygen reduction reaction by decamethylferrocene (DMFc), triggered by hydrophilic metallic cations behaving as Lewis acids towards water molecules in a homogeneous organic phase reaction, was investigated using cyclic voltammetry at the water|1,2-dichl ...

Elsevier2014

Finger Probe Array for Topography-Tolerant Scanning Electrochemical Microscopy of Extended Samples

Hubert Girault, Gunther Wittstock, Fernando Cortes Salazar, Dmitry Momotenko, Andreas Stephan Lesch

Scanning electrochemical microscopy with soft microelectrode array probes has recently been used to enable reactivity imaging of extended areas and to compensate sample corrugation perpendicular to the scanning direction. Here, the use of a new type of mic ...

Amer Chemical Soc2014

Surprising acidity of hydrated lithium cations in organic solvents

Hubert Girault, Liang Qiao, Haiqiang Deng, Thomas James Stockmann, Pekka Eero Peljo

Lithium cations are shown to have a significant role on catalyzing oxygen and proton reduction along with SN1 reactions in biphasic systems. We propose that this catalytic effect is due to the surprising acidity of the hydrated cations; interactions betwee ...

Royal Society of Chemistry2014

Kinetic differentiation of bulk/interfacial oxygen reduction mechanisms at/near liquid/liquid interfaces using scanning electrochemical microscopy

Hubert Girault, Fernando Cortes Salazar, Dmitry Momotenko, Haiqiang Deng, Thomas James Stockmann, Pekka Eero Peljo

The present work describes the application of scanning electrochemical microscopy (SECM) in the feedback mode to determine the kinetics of oxygen reduction at or near the liquid/liquid interface – between water and 1,2-dichloroethane (w/DCE). The system co ...

Elsevier2014

Ultrafast Population Dynamics of Surface-Active Dyes during Electrochemically Controlled Ion Transfer across a Liquid|Liquid Interface

Pierre-François Marie Brevet, Hubert Girault, Astrid Johana Olaya Avendano, Evgeny Smirnov

We present for the first time experimental measurements on the ultrafast population dynamics of the model surface-active dye methyl orange (MO) during its ion transfer across the water|1,2-dichloroethane interface by using time-resolved surface second harm ...

Amer Chemical Soc2014

Fingerprinting the Tertiary Structure of Electroadsorbed Lysozyme at Soft Interfaces by Electrostatic Spray Ionization Mass Spectrometry

Hubert Girault, Liang Qiao, Micheal Diarmaid Scanlon

Lysozyme can be electrochemically detected after adsorption at an electrified gel-water interface. Ex-situ characterization by electrostatic spray ionization mass spectrometry provides insights into the interfacial detection mechanism by allowing changes t ...

Royal Society of Chemistry2014

Gold Metal Liquid-Like Droplets

Pierre-François Marie Brevet, Hubert Girault, Manuel Alejandro Méndez Agudelo, Heron Vrubel, Dmitry Momotenko, Micheal Diarmaid Scanlon, Evgeny Smirnov

Simple methods to self-assemble coatings and films encompassing nanoparticles are highly desirable in many practical scenarios, yet scarcely any examples of simple, robust approaches to coat macroscopic droplets with continuous, thick (multilayer), reflect ...

Amer Chemical Soc2014

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