Publications de Christopher Raymond Dennison

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

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

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

On-Site Purification of Copper-Contaminated Vanadium Electrolytes by using a Vanadium Redox Flow Battery

Hubert Girault, Heron Vrubel, Danick Reynard, Christopher Raymond Dennison, Alberto Battistel

Corrosion of carbon-based electrodes and bipolar plates is a major hurdle and can be a cause of failure in commercial vanadium redox flow batteries (VRFBs). Carbon corrosion was found to occur in a commercial VRFB (10 kW/40 kWh), whereby cracks through bip ...

WILEY-V C H VERLAG GMBH2019

Local Study on Hydrogen and Hydrogen Gas Bubble Formation on a Platinum Electrode

Hubert Girault, Andreas Stephan Lesch, Christopher Raymond Dennison, Alberto Battistel

This work investigates the effect of current density on the hydrogen gas bubble formation during electrolysis on a platinum electrode. Local detection of bubble evolution was performed electrochemically by using a hydrogen-collecting microelectrode placed ...

AMER CHEMICAL SOC2019

Efficiency improvement of an all-vanadium redox flow battery by harvesting low-grade heat

Hubert Girault, Danick Reynard, Christopher Raymond Dennison, Alberto Battistel

Redox flow batteries (RFBs) are rugged systems, which can withstand several thousand cycles and last many years. However, they suffer from low energy density, low power density, and low efficiency. Integrating a Thermally Regenerative Electrochemical Cycle ...

2018

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

Hubert Girault, Véronique Amstutz, Heron Vrubel, Pekka Eero Peljo, 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

Enhancing Mass Transport in Redox Flow Batteries by Tailoring Flow Field and Electrode Design

Christopher Raymond Dennison

In this study, we investigate the mass transport effects of various flow field designs paired with raw and laser perforated carbon paper electrodes in redox flow batteries (RFBs). Previously, we observed significant increases in peak power density and limi ...

Electrochemical Society2016

All-Vanadium Dual Circuit Redox Flow Battery for Renewable Hydrogen Generation and Desulfurisation

Hubert Girault, Frédéric Gumy, Véronique Amstutz, Heron Vrubel, Joana Morgado, Pekka Eero Peljo, Kathryn Ellen Toghill, Christopher Raymond Dennison, Justine Nadine Liliane Pandard

An all-vanadium dual circuit redox flow battery is an electrochemical energy storage system capable to function as a conventional battery, but also to produce hydrogen and perform desulfurization when surplus of electricity is available by chemical dischar ...

Royal Society of Chemistry2016

Modeling of Ion Crossover in Vanadium Redox Flow Batteries: A Computationally-Efficient Lumped Parameter Approach for Extended Cycling

Christopher Raymond Dennison

In this work, we have developed a zero-dimensional vanadium redox flow battery (VRFB) model which accounts for all modes of vanadium crossover and enables prediction of long-term performance of the system in a computationally-efficient manner. Using this m ...

Electrochemical Society2016