Theoretical predictions vs. experimental measurements of the electrical conductivity of molten Li2CO3–K2CO3 modified by additives

Lair, Virginie; Albin, V.; Ringuedé, Armelle; Cassir, M.

doi:10.1016/j.ijhydene.2011.09.153

Cited by 34 publications

(24 citation statements)

References 24 publications

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“…19 The high-temperature electrochemical half-cell was a single-compartment crucible with dimensions of 70 × 50 mm 2 contained in an alumina Al 2 O 3 reactor with dimensions of 250 × 60 mm 2 hermetically sealed by a stainless steel cover with a Viton O-ring. Temperature was controlled at a constant value of 650…”

Section: Methodsmentioning

confidence: 99%

Chronopotentiometric Approach of CO₂Reduction in Molten Carbonates

Brouzgou

Crapart

Albin

et al. 2017

J. Electrochem. Soc.

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Carbon capture and valorization is a new route increasingly discussed to reduce greenhouse gas emissions. One of the paths foreseen for CO 2 valorization is its transformation into fuels by electrochemical reduction of carbon dioxide. In this approach, molten carbonates are of particular interest since they can be used to capture CO 2 molecule because of its high solubility; hence, valorization by electrolysis is possible in molten carbonate media. To better understand CO 2 reduction, chronopotentiometric and chronoamperometric techniques were used at gold and graphite electrodes immersed in four alkali carbonate eutectics, Li-Na, Li-K, Li-Na-K and Na-K. The results complemented a previous work based on cyclic voltammetry and confirmed the existence of a main CO 2 reduction phenomena around −1.2 V vs Ag/Ag + that involves two one-electron steps or a two-electron unique step. Transition time analysis showed that the reduction mechanism is either simultaneous reduction of CO 2 adsorbed and diffusion species or rapid equilibrium between adsorbed and diffusing species. Furthermore, we identified another electrochemical system involving adsorbed CO 2 and CO at higher potentials. In summary, we have succeeded in proving and précising some previous results, as well as identifying reduction mechanisms.

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Section: Methodsmentioning

confidence: 99%

Chronopotentiometric Approach of CO₂Reduction in Molten Carbonates

Brouzgou

Crapart

Albin

et al. 2017

J. Electrochem. Soc.

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“…In inset we show how 𝐸 𝐴 varies with pressure, including a fit of the form 𝐸 𝐴 (𝑃 ) = Ref. [31] at 𝑇 = 923 K and 𝑇 = 973 K and to the ones for the 60:40 mol% mixture at 𝑇 = 1000 K and at 𝑇 = 1100 K from Ref. [30].…”

Section: B Structurementioning

confidence: 99%

Insight into the Li2CO3–K2CO3 eutectic mixture from classical molecular dynamics: Thermodynamics, structure, and dynamics

Corradini

Coudert

Vuilleumier

2016

The Journal of Chemical Physics

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We use molecular dynamics simulations to study the thermodynamics, structure and dynamics of the Li 2 CO 3 -K 2 CO 3 (62:38 mol%) eutectic mixture. We present a new classical non-polarizable force field for this molten salt mixture, optimized using experimental and first principles molecular dynamics simulations data as reference. This simple force field allows efficient molecular simulations of phenomena at long timescales. We use this optimized force field to describe the behavior of the eutectic mixture in the 900-1100 K temperature range, at pressures between 0 and 5 GPa. After studying the equation of state in these thermodynamic conditions, we present molecular insight into the structure and dynamics of the melt. In particular, we present an analysis of the temperature and pressure dependence of the eutectic mixture's self diffusion coefficients, viscosity and ionic conductivity.

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“…The interest of molten carbonates proceeds from their unique chemical and physical properties described by many authors (Yuh et al, 1995;Janz and Lorenz, 1961;Ward and Janz, 1965;Kojima et al, 2008;Lair et al, 2012). First of all, they cover a large domain of temperatures according to their nature and combinations, roughly from 450°C to more than 1,000°C.…”

Section: Molten Carbonates: Strategic Electrolytes Physicochemical Prmentioning

confidence: 99%

Overview on CO2 Valorization: Challenge of Molten Carbonates

2015

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The capture and utilization of CO2 is becoming progressively one of the significant challenges in the field of energetic resources. Whatever the energetic device, it is impossible to avoid completely the production of greenhouse gas, even parting from renewable energies. Transforming CO2 into a valuable fuel, such as alcohols, CO, or even C, could constitute a conceptual revolution in the energetic bouquet offering a huge application domain. Although several routes have been tested for this purpose, on which a general panorama will be given here, molten carbonates are attracting a renewed interest aiming at dissolving and reducing carbon dioxide in such melts. Because of their unique properties, molten carbonates are already used as electrolytes in molten carbonate fuel cells; they can also provoke a breakthrough in a new economy considering CO2 as an energetic source rather than a waste. Molten carbonates' science and technology is becoming a strategic field of research for energy and environmental issues. Our aim in this review is to put in evidence the benefits of molten carbonates to valorize CO2 and to show that it is one of the most interesting routes for such application.

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Theoretical predictions vs. experimental measurements of the electrical conductivity of molten Li2CO3–K2CO3 modified by additives

Cited by 34 publications

References 24 publications

Chronopotentiometric Approach of CO₂Reduction in Molten Carbonates

Chronopotentiometric Approach of CO₂Reduction in Molten Carbonates

Insight into the Li2CO3–K2CO3 eutectic mixture from classical molecular dynamics: Thermodynamics, structure, and dynamics

Overview on CO2 Valorization: Challenge of Molten Carbonates

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Theoretical predictions vs. experimental measurements of the electrical conductivity of molten Li2CO3–K2CO3 modified by additives

Cited by 34 publications

References 24 publications

Chronopotentiometric Approach of CO2Reduction in Molten Carbonates

Chronopotentiometric Approach of CO2Reduction in Molten Carbonates

Insight into the Li2CO3–K2CO3 eutectic mixture from classical molecular dynamics: Thermodynamics, structure, and dynamics

Overview on CO2 Valorization: Challenge of Molten Carbonates

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Chronopotentiometric Approach of CO₂Reduction in Molten Carbonates

Chronopotentiometric Approach of CO₂Reduction in Molten Carbonates