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Pekka Eero Peljo

Cette personne a quitté l’EPFL

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Publications associées (47)

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Vanadium‐manganese redox flow battery: Study of Mn(III) disproportionation in the presence of other metallic ions

Hubert Girault, Pekka Eero Peljo, Danick Reynard, Sunny Isaïe Maye, Solène Cindy Gentil

The Mn(III)/Mn(II) redox couple with a standard potential of +1.51 V vs . SHE has drawn interest for the design of V/Mn redox flow battery (RFB). However, Mn(III) disproportionation leads to a loss of capacity, an increase of pressure drop and electrode pa ...

Wiley2020

Semi-analytical modelling of linear scan voltammetric responses for soluble-insoluble system: The case of metal deposition

Imene Atek, Hubert Girault, Pekka Eero Peljo, Sunny Isaïe Maye

The absence of general theoretical models describing linear sweep voltammetry (LSV) or cyclic voltammetry (CV) responses for soluble-insoluble systems such as one-step electrodeposition reactions under quasi-reversible condition makes it difficult to extra ...

2018

Battery

Pekka Eero Peljo

In a battery system, an electrochemical cell has a first compartment containing a positive electrolyte with an electrode 2 at least partially immersed in the positive electrolyte containing the first redox active material, forming a positive half cell. A s ...

2017

Single Organic Droplet Collision Voltammogram via Electron Transfer Coupled Ion Transfer

Pekka Eero Peljo, Haiqiang Deng

Single-emulsion toluene oil droplets (femtoliter) containing a hydrophobic redox probe that are dispersed in water stochastically collide with an ultramicroelectrode (UME). The fast-scan cyclic voltammetry (FSCV) or Fourier-transformed sinusoidal voltammet ...

American Chemical Society2017

Electrochemically Controlled Proton-Transfer-Catalyzed Reactions at Liquid-Liquid Interfaces: Nucleophilic Substitution on Ferrocene Methanol

Hubert Girault, Pekka Eero Peljo, Liang Qiao

The generation of α-ferrocenyl carbocations from ferrocenyl alcohols for SN1 substitution at the water–organic solvent interface is initiated by the transfer of protons into the organic phase. The proton flux, and hence the reaction rate, can be controlled ...

Wiley-Blackwell2013

Redox Solid Energy Boosters for Flow Batteries: Polyaniline as a Case Study

Hubert Girault, Pekka Eero Peljo, Heron Vrubel, Véronique Amstutz, Christopher Raymond Dennison, Alberto Battistel, Elena Zanzola

In this work, the viability of polyaniline as a solid charge storage material in an aqueous redox-mediated flow battery is investigated. Fe(III/II) and V(IV/III) were identified as potential redox mediators to target the emeraldine-pernigraniline and leuco ...

Elsevier2017

Role of electrolytes in vanadium-cerium flow batteries

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

Amer Chemical Soc2014

Gold Raspberry-Like Colloidosomes Prepared at the Water-Nitromethane Interface

Hubert Girault, Pekka Eero Peljo, Evgeny Smirnov

Here, we propose a simple shake-flask method to produce micron-size colloidosomes from a liquid-liquid interface functionalized with a gold nanoparticle film. A step-by-step extraction process of an organic phase partially miscible with water led to the fo ...

2018

Interfacial Redox Catalysis on Gold Nanofilms at Soft Interfaces

Hubert Girault, Pekka Eero Peljo, Evgeny Smirnov, Micheal Diarmaid Scanlon

Soft or “liquid-liquid” interfaces were functionalized by half a monolayer of mirror-like nanofilms of gold nanoparticles using a precise interfacial microinjection method. The surface coverage of the nanofilm was characterized by ion transfer voltammetry. ...

Amer Chemical Soc2015

Gold Nanofilms at Liquid–Liquid Interfaces: An Emerging Platform for Redox Electrocatalysis, Nanoplasmonic Sensors, and Electrovariable Optics

Pekka Eero Peljo, Micheal Diarmaid Scanlon, Evgeny Smirnov, Thomas James Stockmann

The functionality of liquid–liquid interfaces formed between two immiscible electrolyte solutions (ITIES) can be markedly enhanced by modification with supramolecular assemblies or solid nanomaterials. The focus of this Review is recent progress involving ...

2018

Chaotropic Agents Boosting the Performance of Photo-ionic Cells

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

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

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

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

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

Charging and Discharging at the Nanoscale: Fermi Level Equilibration of Metallic Nanoparticles

Hubert Girault, Pekka Eero Peljo, Manuel Alejandro Méndez Agudelo, Evgeny Smirnov, Micheal Diarmaid Scanlon

The redox properties of metallic nanoparticles are discussed, in particular the relationships between excess charge, size and the Fermi level of the electrons. The redox potentials are derived using simple electrostatic models to provide a straightforward ...

Royal Soc Chemistry2015

Charge distribution and Fermi level in bimetallic nanoparticles

Pekka Eero Peljo

Upon metal-metal contact, a transfer of electrons will occur between the metals until the Fermi levels in both phases are equal, resulting in a net charge difference across the metal-metal interface. Here, we have examined this contact electrification in b ...

Royal Society of Chemistry2016

Variation of the Fermi level and the electrostatic force of a metallic nanoparticle upon colliding with an electrode (vol 8, pg 4795, 2017)

Hubert Girault, Pekka Eero Peljo

Royal Soc Chemistry2017

Towards a thermally regenerative all-copper redox flow battery

Pekka Eero Peljo

An all-copper redox flow battery based on strong complexation of Cu+ with acetonitrile is demonstrated, exhibiting reasonable battery performance. More interestingly, the battery can be charged by heat sources of 100 degrees C, by distilling off the aceton ...

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, Pekka Eero Peljo, Dmitry Momotenko, Haiqiang Deng, Thomas James Stockmann

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

Ion Transfer Battery: Storing Energy by Transferring Ions across Liquid-Liquid Interfaces

Hubert Girault, Pekka Eero Peljo

A battery utilizing the Galvani potential difference between aqueous and organic phases is demonstrated. The battery consists of two organic redox electrolytes separated by an immiscible aqueous phase. The charge is stored by transferring a salt from the a ...

Royal Society of Chemistry2016

Solid electrochemical energy storage for aqueous redox flow batteries: The case of copper hexacyanoferrate

Hubert Girault, Pekka Eero Peljo, Evgeny Smirnov, Danick Reynard, Christopher Raymond Dennison, Grégoire Clément Gschwend, Solène Cindy Gentil, Elena Zanzola

All redox flow batteries suffer from low energy storage density in comparison with conventional Li-ion batteries. However, this issue can be mitigated by utilization of solid energy storage materials to enhance the energy storage capacity. In this paper we ...

2019

Redox Electrocatalysis of Floating Nanoparticles: Determining Electrocatalytic Properties without the Influence of Solid Supports

Hubert Girault, Pekka Eero Peljo, Micheal Diarmaid Scanlon, Astrid Johana Olaya Avendano, Evgeny Smirnov, Thomas James Stockmann, Lucie Josette Renée Rivier

Redox electrocatalysis (catalysis of electron-transfer reactions by floating conductive particles) is discussed from the point-of-view of Fermi level equilibration, and an overall theoretical framework is given. Examples of redox electrocatalysis in soluti ...

2017