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KEY PUBLICATIONS AND CONFERENCE TALKS

References and Links to Papers

 

May 22, 2019

LOCAL ENERGY STORAGE AND STOCHASTIC MODELLING FOR ULTRAFAST CHARGING STATIONS

Ligen, Y.; Vrubel, H.; Girault, H. Local Energy Storage and Stochastic Modeling for Ultrafast Charging Stations. Energies 2019, 12, 1986; https://doi.org/10.3390/en12101986 

How to manage peak power demands in multi-stall charging stations ? How many charging points to install ? and how to size an energy buffer ? all this questions are answered in this publication.

May 23, 2018

MOBILITY FROM RENEWABLE ELECTRICITY

Mobility from Renewable Electricity: Infrastructure Comparison for Battery and Hydrogen Fuel Cell Vehicles, World Electr. Veh. J. 2018, 9(1), 3; https://doi.org/10.3390/wevj9010003

This work presents a detailed breakdown of the energy conversion chains from intermittent electricity to a vehicle, considering battery electric vehicles (BEVs) and fuel cell electric vehicles (FCEVs). The traditional well-to-wheel analysis is adapted to a grid to mobility approach by introducing the intermediate steps of useful electricity, energy carrier and on-board storage. Specific attention is given to an effective coupling with renewable electricity sources and associated storage needs.

March 13, 2018

DESIGN AND OPERATION OF A GRID TO MOBILITY DEMONSTRATOR

Conference presentation for EEVC 2018. Geneva

A full year of  solar irradiance measurements is used to provide stationnary battery sizing results for an average Swiss refilling station. Self-sufficiency and self-consumption potentials are discussed. In a second part the hydrogen protocols developped in the demonstrator are presented.

October 10, 2017

USEFUL MOBILITY SERVICE DERIVED FROM RENEWABLE ELECTRICITY: A COMPARISON BETWEEN BATTERY ELECTRIC AND HYDROGEN FUEL CELL VEHICLES INFRASTRUCTURE

This work presents a detailed breakdown of the energy conversion chains from the electrical grid to the vehicle, considering battery electric vehicles (BEVs) and fuel cell electric vehicles (FCEVs). The traditional well-to-wheel analysis is adapted to a grid to mobility approach by introducing the intermediate steps of useful electricity, energy carrier and on-board storage. A specific attention is given to an effective coupling with renewable electricity sources and associated storage needs.

Using actual market data, it is shown that, compared to FCEVs, BEVs and their infrastructure are twice more efficient in the conversion of renewable electricity to a mobility service. A much larger difference between BEVs and FCEVs is usually reported in the literature. Focusing on recharging events, this work additionally shows that the infrastructure efficiencies of both electric vehicles (EVs) types are very close, with 57% from grid to on-board storage for hydrogen refilling stations and 66% for fast chargers coupled with battery storage. Slow charging modes can achieve a charging infrastructure efficiency of 78% for residential energy storage systems coupled with AC chargers.

July 12, 2017

REDOX FLOW BATTERIES FOR CHARGING BOTH ELECTRIC & HYDROGEN CARS

46th World Chemistry Congress,  July 9 to 14, 2017 - São Paulo - Brazil
IUPAC 49th General Assembly, July 7 to 13, 2017 - São Paulo - Brazil
Sustainability & Diversity through Chemistry

April 30, 2017

REDOX SOLID ENERGY BOOSTERS FOR FLOW BATTERIES: POLYANILINE AS A CASE STUDY

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 leucoemeraldine-emeraldine redox transitions of the polymer. An indirect chemical cycling method was developed and used to investigate the charging/discharging of the polymer by the selected redox mediators. With Fe(III/II) as a redox mediator, respectable specific capacity and cycling stability were demonstrated over 25 cycles. V(IV/III) was deemed unsuitable as a redox mediator, due to rather poor kinetics. When added to the electrolyte tanks of a complete flow battery, a conductive composite of polyaniline and carbon black provided a significant improvement in capacity, exhibiting a specific capacity of 64.8 mA h g−1 at a current density of 38.5 mA cm−2. This represents a three-fold improvement in volumetric capacity, compared with the electrolyte alone. Moreover, the addition of the polyaniline composite was observed to lower the average potential at the positive electrode, providing a considerable improvement in voltage efficiency. This work demonstrates the potential of utilizing redox mediators to enable bulk solid-phase charge storage in the tanks of aqueous redox flow batteries.

March 14, 2017

MEGABATTERIES FOR FAST DC CHARGING AND HYDROGEN PRODUCTION. FUELLING BOTH ELECTRIC CARS AND FUEL CELL CARS

European Electric& Hybrid Vehicle Congress  (EEVC 2017) - Geneva

March 25, 2017

RENEWABLE HYDROGEN GENERATION FROM A DUAL-CIRCUIT REDOX FLOW BATTERY

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 energy in the electrolytes. In the RFB system reported here, the electrolytes are conventionally charged but are then chemically discharged over catalytic beds in separate external circuits. The catalytic reaction of particular interest generates hydrogen gas as secondary energy storage. For demonstration, indirect water electrolysis was performed generating hydrogen and oxygen in separate catalytic reactions. The electrolyte containing V(II) was chemically discharged through proton reduction to hydrogen on a molybdenum carbide catalyst, whereas the electrolyte comprising Ce(IV) was similarly discharged in the oxidation of water to oxygen on a ruthenium dioxide catalyst. This approach is designed to complement electrochemical energy storage and may circumvent the low energy density of RFBs especially as hydrogen can be produced continuously whilst the RFB is charging.

November 30, 2015

REDOX FLOW BATTERIES, HYDROGEN AND DISTRIBUTED STORAGE

Dual-Circuit Redox Flow Battery Demonstration

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