Publications de Bin Su | EPFL Graph Search

Ionic partition diagram of tetraphenylporphyrin at the water|1,2-dichloroethane interface

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia, Manuel Alejandro Méndez Agudelo

diagram of 5,10,15,20-tetraphenyl-21H,23H-porphine (H2TPP) at the water|1,2-dichloroethane interface using a simple Born solvation model. This zone diagram shows under which form this porphyrin is present, i.e. neutral, monoprotonated or diprotonated, and ...

Elsevier2011

Oxygen reduction catalyzed by a fluorinated tetraphenylporphyrin free base at liquid/liquid interfaces

Hubert Girault, Zdenek Samec, Bin Su, Anne-Clémence Corminboeuf, Manuel Alejandro Méndez Agudelo, Imren Hatay

The diprotonated form of a fluorinated free base porphyrin, namely 5-(p-aminophenyl)-10,15,20-tris(pentafluorophenyl)porphyrin (H(2)FAP), can catalyze the reduction of oxygen by a weak electron donor, namely ferrocene (Fc). At a water/1,2-dichloroethane in ...

American Chemical Society2010

Molecular Electrocatalysis for Oxygen Reduction by Cobalt Porphyrins Adsorbed at Liquid/Liquid Interfaces

Hubert Girault, Zdenek Samec, Pierre-Alain Carrupt, Bin Su, Imren Hatay

Molecular electrocatalysis for oxygen reduction at a polarized water/1,2-dichloroethane (DCE) interface was studied, involving aqueous protons, ferrocene (Fc) in DCE and amphiphilic cobalt porphyrin catalysts adsorbed at the interface. The catalyst, (2,8,1 ...

2010

Oxygen reduction by decamethylferrocene at liquid/liquid interfaces catalyzed by dodecylaniline

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia, Manuel Alejandro Méndez Agudelo, Imren Hatay

Molecular oxygen (O2) reduction by decamethylferrocene (DMFc) was investigated at a polarized water/ 1,2-dichloroethane (DCE) interface. Electrochemical results point to a mechanism similar to the EC type reaction at the conventional electrode/solution int ...

Elsevier2010

Dioxygen Reduction by Cobalt(II) Octaethylporphyrin at Liquid / Liquid Interfaces

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia, Manuel Alejandro Méndez Agudelo

Oxygen reduction catalyzed by cobalt(II) (2,3,7,8,12,13,17,18-octaethylporphyrin) [Co(OEP)] at soft interfaces is studied by voltammetry and biphasic reactions. When Co(OEP) is present in a solution of 1,2-dichloroethane in contact with an aqueous acidic s ...

Wiley-Blackwell2010

Oxygen and proton reduction by decamethylferrocene in non-aqueous acidic media

Hubert Girault, Zdenek Samec, Bin Su, Anne-Clémence Corminboeuf, Manuel Alejandro Méndez Agudelo, Imren Hatay, Peiyu Ge

Experimental studies and density functional theory (DFT) computations suggest that oxygen and proton reduction by decamethylferrocene (DMFc) in 1,2-dichloroethane involves protonated DMFc, DMFcH+, as an active intermediate species, producing hydrogen perox ...

Royal Society of Chemistry2010

Voltammetry for surface-active ions at polarisable liquid|liquid interfaces

Hubert Girault, Bin Su, Manuel Alejandro Méndez Agudelo

Adsorption of charged species at the interface between two immiscible electrolyte solutions (ITIES) is simulated taking into account both the mutual influence between the potential dependent surface excess charge and the potential distribution between the ...

2009

Hydrogen Evolution at Liquid–Liquid Interfaces

Hubert Girault, Bin Su, Raheleh Partovi Nia, Xile Hu, Imren Hatay, Heron Vrubel

Blowing bubbles: Hydrogen evolution by proton reduction with [(C5Me5)2Fe] occurs at a soft interface between water and 1,2-dichloroethane (DCE). The reaction proceeds by proton transfer assisted by [(C5Me5)2Fe] across the water–DCE interface with subsequen ...

Wiley-VCH Verlag GmbH2009

About the Electrospray Ionization Source in Mass Spectrometry: Electrochemistry and On-chip Reactions

Hubert Girault, Joël Stéphane Rossier, Michel Prudent, Niels Erik Lion, Christophe Roussel, Bin Su, Manuel Alejandro Méndez Agudelo

The present work shows that the electrochemical properties of electrospray ionization (ESI) can be used to add functions to the process. As example, we show how the choice of the electrode material can be used to study interactions between metal ions and b ...

2009

Detection of hydrogen peroxide produced at a liquid/liquid interface using scanning electrochemical microscopy

Hubert Girault, Bin Su, Raheleh Partovi Nia, Fernando Cortes Salazar

Scanning electrochemical microscopy (SECM) was used to monitor in situ hydrogen peroxide (H2O2) produced at a polarized water/1,2-dichloroethane (DCE) interface. The water/DCE interface was formed between a DCE droplet containing decamethylferrocene (DMFc) ...

Elsevier2009

Proton Pump for O2 Reduction Catalyzed by 5,10,15,20- Tetraphenylporphyrinatocobalt(II)

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia, Fengping Li

The role of 5,10,15,20-tetraphenylporphyrinatocobalt(II) ([Co-(tpp)]) as a catalyst on molecular oxygen (O2) reduction by ferrocene (Fc) and its two derivatives, 1,1’-di-methylferrocene (DFc) and decamethylferrocene (DMFc) at a polarized water¦1,2-dichloro ...

2009

Evidence of tetraphenylporphyrin monoacids by ion-transfer voltammetry at polarized liquid|liquid interfaces

Hubert Girault, Zdenek Samec, Bin Su, Raheleh Partovi Nia

We present a simple methodology to illustrate the existence of tetraphenylporphyrin monoacid based on ion-transfer voltammetry at a polarized water|1,2-dichloroethane interface and organic pK values are also estimated. ...

Royal Society of Chemistry2008

Nanoporous Photocathode and Photoanode Made by Multilayer Assembly of Quantum Dots

Hubert Girault, Bin Su, Mohamad Hojeij

We perform in this paper a kinetic study of the photoelectrochemical responses of nanoporous thin photoactive films. The films were fabricated by by a layer-by-layer assembly of positively charged polyelectrolytes (poly-L- Lysine, pLys) and negatively char ...

American Chemical Society2008

H2O2 generation by decamethylferrocene at a liquid | liquid interface

Hubert Girault, Michel Prudent, Zdenek Samec, Bin Su, Mohamad Hojeij, Raheleh Partovi Nia, Anne-Clémence Corminboeuf

Hydrogen peroxide generation at a liquid|liquid interface occurs with a yield of 20 % with respect to the concentration of reducing agent (decamethylferrocene). The liquid|liquid interface supplies electrons from the reducing agent and protons from the aqu ...

Wiley-VCH Verlag GmbH2008

Nanoporous photocathode and photoanode for light energy conversion

Hubert Girault, Bin Su, Mohamad Hojeij

2008

Porphyrin ‘‘Mille-Feuilles” photo-electrodes

Hubert Girault, Bin Su, Mohamad Hojeij

A porphyrin ‘‘Mille-Feuilles” photo-electrode is fabricated layer-by-layer by deposition of anionic [zinc meso-tetrakis(p-sulfonato phenyl) porphyrin]4- (ZnTPPS4−) and positively charged polypeptides on a 11-mercaptoundecanoic acid-modified gold electrode ...

2008

Peptide-Phospholipid Complex Formation at Liquid-Liquid Interfaces

Hubert Girault, Michel Prudent, Bin Su, Manuel Alejandro Méndez Agudelo

Two peptides known to interact with receptors embedded in cell membranes, angiotensin III (AngIII) and Leuenkephalin(LeuEnk), were studied electrochemically at the interface formed between two immiscible electrolyte solutions modified by an adsorbed monola ...

2008

SECM photography

Hubert Girault, Bin Su, Mohamad Hojeij, Fernando Cortes Salazar

A novel strategy for imaging commercial black-and-white negative photo films by scanning electrochemical microscopy (SECM) is demonstrated. The imaging is based on using IrCl3 6 as the redox mediator to dissolve silver grains. The SECM probe is biased at a ...

Elsevier2008

Protoporphyrin IX sensitized titanium oxide gel electrode

Hubert Girault, Christophe Roussel, Bin Su

Titanium oxide (Ti(O)) xerogel films functionalized by protoporphyrin IX (PPIX) and ferrocene carboxylic acid (FCA) were deposited on indium tin oxide (ITO) electrodes following a sol–gel synthesis. PPIX and FCA were first complexed to titanium oxide precu ...

Elsevier2008

3D-ITIES supported on porous reticulated vitreous carbon

Hubert Girault, Nicolas Eugster, Bin Su, Mohamad Hojeij

A thin aqueous film prepared by layer-by-layer assembly of oppositely charged polypeptides on 4-aminobenzoic acid modified porous reticulated vitreous carbon (RVC) electrodes was used with the aim of forming a 3D-ITIES. The film containing a redox mediator ...

2007