Publications by Christos Comninellis

Related publications (91)

Quantifying electrochemical promotion of induced bipolar Pt particles supported on YSZ

Christos Comninellis, Wolfgang Harbich, Michael Hugentobler, Chun Xia

Electrochemical promotion (EP) of CO oxidation is shown for the first time on induced bipolar Pt particles supported on yttria-stabilized zirconia (YSZ). These Pt particles are formed by sputter deposition of high-purity Pt metal followed by sintering. Con ...

Elsevier2010

Solid electrochemical mass spectrometry (SEMS) for investigation of supported metal catalysts under high vacuum

Christos Comninellis, Wolfgang Harbich, Cyril Falgairette, Chun Xia

A new experimental set-up, coupling electrochemistry and mass spectroscopic techniques, for the investigation of a solid electrochemical cell under high vacuum conditions (HV) is presented. Two configurations are realized allowing the investigation of both ...

Springer Netherlands2010

Electrochemical behavior of ammonia at Ni/Ni(OH)2 electrode

Christos Comninellis, Agnieszka Kapalka

The electrochemical oxidation of ammonia was investigated on a Ni/Ni(OH)(2) electrode prepared by potential cycling of a Ni electrode in 1 M NaClO4. It was found that oxidation of ammonia is strongly pH dependent and proceeds mainly at pH values above 7. T ...

Elsevier2010

Segmented cell testing for cathode parameter investigation

Jan Van Herle, Christos Comninellis, Zacharie Wuillemin, Josef Andreas Schuler, Pietro Tanasini

The increasing quality and durability of solid oxide fuel cells (SOFCs) state-of-the-art materials renders the long-term testing of fuel cells difficult since considerably long equipment times are needed to obtain valuable results. Moreover, reproducibilit ...

Elsevier2011

Effects of carbonate on the electrolytic removal of ammonia and urea from urine with thermally prepared IrO2 electrodes

Christos Comninellis, Agnieszka Kapalka, Véronique Amstutz

Recent studies have shown that electrolysis can be an efficient process for nitrogen removal from urine. These studies have been conducted with urea solutions or fresh urine, but urine collected in NoMix toilets and urinals has a substantially different co ...

Springer Netherlands2012

Influence of Doping Level on the Electrochemical Oxidation of Formic Acid on Boron Doped Diamond Electrodes

Christos Comninellis, Stéphane Fierro

The influence of the boron doping level in boron doped diamond electrodes (BDD) on the electro-generation of active intermediates (hydroxyl radicals and hydrogen peroxide) involved in the oxidation of organic compounds has been studied. It is shown that th ...

2011

Renewable hydrogen generation from a dual-circuit redox flow battery

Hubert Girault, Christos Comninellis, Xile Hu, Heron Vrubel, Véronique Amstutz, Kathryn Ellen Toghill

Redox flow batteries (RFBs) are particularly well suited for storing the intermittent excess supply of renewable electricity; so-called “junk” electricity. Conventional RFBs are charged and discharged electrochemically, with electricity stored as chemical ...

Royal Soc Chemistry2014

Highly-Ordered Magneli Ti4O7 Nanotube Arrays as Effective Anodic Material for Electro-oxidation

Christos Comninellis

Pure Magneli Ti4O7 nanotube arrays (NTA) were successfully fabricated by reducing TiO2 NTA with hydrogen at 850 degrees C for 30 minutes. The microstructure, composition and electrochemical behavior of the prepared Ti4O7 NTA were characterized by means of ...

Pergamon-Elsevier Science Ltd2015

pH sensing using boron doped diamond electrodes

Christos Comninellis, Stéphane Fierro

The boron doped diamond (BDD) electrode is presented as an appropriate candidate for next generation glass-free, highly stable and accurate pH sensors. The method used in this study is based on the potential change related to the hydrogen evolution reactio ...

2011

Electrochemically Induced Oscillations of C2H4 Oxidation Over Thin Sputtered Rh Catalyst Films

Christos Comninellis, György Foti

The electrochem. promoted induction of self-sustained catalytic rate and potential oscillations during C2H4 oxidn. was studied over sputtered Rh thin (40 nm catalyst films interfaced with ZrO2 (8 mol% Y2O3)). The reaction rate oscillates simultaneously wit ...

2005

Investigation of the "permanent" electrochemical promotion of catalysis (P-EPOC) by electrochemical mass spectrometry (EMS) measurements

Christos Comninellis, Cyril Falgairette, Chun Xia

The phenomenon of electrochemical promotion of catalysis (EPOC) is most often fully reversible. Subsequent to long-lasting polarization, however, the new steady-state open-circuit catalytic activity after current interruption may remain significantly highe ...

Elsevier2010

Gas-phase volatile organic chloride electroreduction: A versatile experimental setup for electrolytic dechlorination and voltammetric analysis

Christos Comninellis

Silver is a well-known and largely studied electrocatalytic material for (hydro)dehalogenation reactions of organic halides, a class which includes several priority pollutants. Silver nanoparticles are particularly attractive since exhibit similar or even ...

Elsevier2014

REDOX FLOW BATTERY FOR HYDROGEN GENERATION

Hubert Girault, Christos Comninellis, Véronique Amstutz, Kathryn Ellen Toghill

The present invention combines the storage capacity of redox flow batteries and the production of hydrogen and other products of chemical redox reactions. The redox couple of each electrolyte is chemically regenerated on a specific catalyst bed 11, replaci ...

2013

Bubble evolution on a vertical electrode under extreme current densities

Christos Comninellis, Hannes Bleuler, Rolf Wüthrich

Under gas evolution, the current voltage characteristics of an electrochemical cell are strongly affected by the presence of growing bubbles. At high current densities, the evolution of the bubbles becomes the rate limiting step of the electrochemical proc ...

2005

Electrochemical incineration of chloromethylphyenoxy herbicides in acid medium by anodic oxidation with boron-doped diamond electrodes

Christos Comninellis, Pierre-Alain Michaud, Béatrice Marselli Fuerer

The electrochemical degradation of saturated solutions of herbicides 4-chloro-2-methylphenoxyacetic acid, 2-(4-chlorophenoxy)-2-methylpropionic acid and 2-(4-chloro-2-methylphenoxy)propionic acid in 1 M HClO4 on a boron-doped diamond (BDD) thin film anode ...

2006

Method and apparatus for carrying out electrochemically promoted reactions

Christos Comninellis, György Foti

The method and app. for carrying out electrochem. promoted catalytic reactions, i.e., catalytic reactions where the catalytic rate and selectivity is modified by applying an elec. current or potential between the porous catalyst film which is deposited on ...

(University of Patras, Greece).2005

Charge storage at the Pt/YSZ interface

Christos Comninellis, György Foti, Cyril Falgairette, Arnaud Jaccoud

The electrochemical behavior of Pt/YSZ electrodes in oxygen containing atmosphere at 450 A degrees C has been investigated by double-step chronoamperometry and programmed linear sweep cyclic voltammetry. The response of the O-2(g),Pt/YSZ system in these ex ...

Springer US2009

Experimental and Theoretical Investigation of Degradation Mechanisms in SOFC Electrodes

Jan Van Herle, Christos Comninellis, Aïcha Hessler-Wyser, Antonin Faes, Pietro Tanasini

Performance degradation data obtained on single solid oxide fuel cells tested at 850°C with air and humidified H2 and using Ni-YSZ anode supported cells are presented. Microscopic investigation is carried out on both anode and cathode to quantify variation ...

2009

Electrochemical comparison between IrO2 prepared by thermal treatment of iridium metal and IrO2 prepared by thermal decomposition of H2IrCl6 solution

Christos Comninellis, Agnieszka Kapalka, Stéphane Fierro

The surface redox activities, the oxygen evolution reaction (OER), the oxidation of formic acid (FA) and the anodic stability have been investigated and compared on IrO2 electrodes prepared by two techniques: the thermal decomposition of H2IrCl6 precursor ...

Elsevier2010

Microelectrode-array of IrO2 prepared by thermal treatment of pure Ir

Christos Comninellis, Agnieszka Kapalka, Stéphane Fierro

In this paper, the IrO2 electrode preparation technique consisting in thermal treatment of pure Ir in air was used in order to produce an IrO2-based microelectrode-array (TOIROF-MEA) with low capacitive background current. The TOIROF-MEA was characterized ...

Elsevier2010