Study of kinetics of carbon felt electrodes for vanadium redox flow battery

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Study of kinetics of carbon felt electrodes for vanadium redox flow battery

Popis výsledku v původním jazyce

The vanadium redox flow battery provides efficient, safe and long-life stationary energy storage allowing for compensating the misbalances between the production and consumption of electrical energy throughout a day. The electrolytes stored in external tanks are pumped through the battery stack where the energy conversion is realized via reactions of vanadium redox couples on inert electrodes. The graphite felt electrodes are typically used as they combine good conductivity, chemical and electrochemical stability and reasonable price. Their electrocatalytic activity can be improved, e.g., by thermal pre-treatments. The aim of this work was to optimize the temperature of thermal treatment for two different types of graphite felts to be used in the battery stack. The effect of the treatment was observed on the felt wettability and oxygen coverage of the fiber surface by XPS. The electrochemical characterization by cyclic voltammetry was done in electrochemical cell of tailored in-house design and construction. Significant enhancements of felt electrode performance were reached by the treatment, however, optimal temperatures differed for both carbon felts. Treatment at 500 oC was optimal for Felt A, resulting in the highest oxygen coverage and electrode-electrolyte interface area. For Felt B the optimum was interplay between the oxygen coverage and the interface area, treatment at 350 oC was found optimal for Felt B.

Název v anglickém jazyce

Study of kinetics of carbon felt electrodes for vanadium redox flow battery

Popis výsledku anglicky

The vanadium redox flow battery provides efficient, safe and long-life stationary energy storage allowing for compensating the misbalances between the production and consumption of electrical energy throughout a day. The electrolytes stored in external tanks are pumped through the battery stack where the energy conversion is realized via reactions of vanadium redox couples on inert electrodes. The graphite felt electrodes are typically used as they combine good conductivity, chemical and electrochemical stability and reasonable price. Their electrocatalytic activity can be improved, e.g., by thermal pre-treatments. The aim of this work was to optimize the temperature of thermal treatment for two different types of graphite felts to be used in the battery stack. The effect of the treatment was observed on the felt wettability and oxygen coverage of the fiber surface by XPS. The electrochemical characterization by cyclic voltammetry was done in electrochemical cell of tailored in-house design and construction. Significant enhancements of felt electrode performance were reached by the treatment, however, optimal temperatures differed for both carbon felts. Treatment at 500 oC was optimal for Felt A, resulting in the highest oxygen coverage and electrode-electrolyte interface area. For Felt B the optimum was interplay between the oxygen coverage and the interface area, treatment at 350 oC was found optimal for Felt B.

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Workshop of Students' Prezentations 2016 "Membranes and Membrane Processes"

ISBN

978-80-904517-8-0

ISSN

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e-ISSN

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Počet stran výsledku

11

Strana od-do

1-11

Název nakladatele

Česká membránová platforma

Místo vydání

Česká Lípa

Místo konání akce

Stráž pod Ralskem

Datum konání akce

12. 10. 2016

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

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