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Reference : UMR5253-STELEV-002
Workplace : MONTPELLIER
Date of publication : Monday, November 8, 2021
Type of Contract : FTC Scientist
Contract Period : 18 months
Expected date of employment : 1 March 2022
Proportion of work : Full time
Remuneration : About 2700€/m (brut). Official (non-negociable) salary grids of CNRS
Desired level of education : PhD
Experience required : Indifferent
For the energetic transition, the two main alternatives to fossil fuels are photovoltaics and wind energies but their intermittency requires association with stationary energy storage. Redox Flow Batteries (RFB) principle is based on two circulating electrolytes, the posolyte and the negolyte, stored in external tanks besides the electrochemical cell. Nowadays this technology suffers from flaws such as limited energy densities, cross-over of soluble species through the membrane and high/waving cost of vanadium. Redox Targetting-RFB, is an elegant alternative. It uses flowing redox mediators (RM) (organic molecules) and insertion materials (IM) that remains into the tanks.
ANR NASTOR. The Redox Targeting Redox-Flow batteries (RT-RFB) concept is based on the addition of insertion materials (IM) in the tanks of RFB to increase the energy density. To develop RT-RFB, we'll have to find appropriated insertion materials/redox-mediators (IM/RM) couples for both the posolyte and the negolyte. The potential of the RM has to match that of the IM immobilized in the tank, and the immobilization of IM in the tank has to be properly engineered to optimize the solid/electrolyte interactions. The present project aims to optimize these parameters at the lab cell scale (25 cm2; 20 mL tanks) and to demonstrate the viability at the pilot scale (2100 cm2; 50 L tanks).
ANR NASTOR is a collaborative project bringing together experts on IM and electroactive molecules (LRCS, ICGM), ion conducting membranes (LEPMI), polymer formulation and compounding (CERI-MP) and prototyping (RS2E-LRCS platform).
Work Package 2: Within the ANR, Postdoc hired at ICGM (present offer) will be in charge of the second work package that aims to identify the best carbon-electrode/mediator/insertion material combination. It will be achieved by benchmarking molecular mediators and carbon electrodes. More precisely, work will be divided in three tasks:
Task 1 – Identification of the best mediators.
Electrochemistry (CV, RRDE)
Electrolytes chemistry (solubility, conductivity etc...)
Molecules and electrolytes stability (Spectroscopies UV or IR, RMN, Electrochemistry)
Task 2 – Identification of the best carbon electrodes based on kinetic criteria
Material science / carbons : thermal and acidic treatments
Task 3 – Fundamental electrochemical investigations of mediated Na-(de-)insertion
Electrochemistry (CV, RRDE, Cyclage de batteries)
The candidate should have obtained a PhD in the field of material science or chemistry in the field of energy. Expertise in electrochemistry would be very appreciated.
At the ICGM (Montpellier) the post-doctoral researcher will be supervised by Steven Le Vot and Frédéric Favier.
ICGM benefits from a new building that possess all needed facilities to run the project.
As it is a collaborative project (ANR NASTOR) short stays in partner's laboratories could be envisaged. Few days trips for meetings and conferences (eventually abroad) will be scheduled.
Constraints and risks
Risks and expositions : classical risks linked to a research project in the field of material science and chemistry.
Travels : As it is a collaborative project (ANR NASTOR) short stays in partner's laboratories could be envisaged. Few days trips for meetings and conferences (eventually abroad) will be scheduled.
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