Effect of graphite felt properties on the long-term durability of negative electrode in vanadium redox flow battery

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43920029" target="_blank" >RIV/60461373:22310/19:43920029 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22330/19:43920029 RIV/60461373:22340/19:43920029 RIV/49777513:23640/19:43955092

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0378775319300205" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0378775319300205</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpowsour.2019.01.019" target="_blank" >10.1016/j.jpowsour.2019.01.019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of graphite felt properties on the long-term durability of negative electrode in vanadium redox flow battery

Popis výsledku v původním jazyce

In our contribution we study the long-term durability of two different graphite felt materials serving as negative electrode in vanadium redox flow battery. Both electrodes differ in the precursor material and the way of activation which causes significant differences in relevant properties such as electric conductivity, specific surface area and electrochemical double layer capacitance. The performance stability of the felts within 2000 charge-discharge cycles conducted in lab-scale single-cell is evaluated from 4-point characterization before the cycling and after each 1000 cycles. Significant deterioration of electrocatalytic activity is observed for commercially activated polyacrylonitrile-based negative electrode, whereas the in-house activated rayon-based negative electrode provides stable performance over the whole tested period. A comprehensive post-mortem characterization is performed to identify the causes of different durability of both negative electrodes. X-ray photoelectron spectroscopy analysis reveals very similar changes in surface functionalization by oxygen-containing groups for both felts; however, the decrease of sp2-hybridized carbon and simultaneous increase of sp3-hybridized one is significantly higher for the unstable polyacrylonitrile-based felt. Although the performance deterioration of the polyacrylonitrile-based felt cannot be related to the decrease of the surface area or double-layer capacitance, the high surface area of activated rayon-based felt most probably contributes to its excellent performance stability. © 2019 Elsevier B.V.

Název v anglickém jazyce

Effect of graphite felt properties on the long-term durability of negative electrode in vanadium redox flow battery

Popis výsledku anglicky

In our contribution we study the long-term durability of two different graphite felt materials serving as negative electrode in vanadium redox flow battery. Both electrodes differ in the precursor material and the way of activation which causes significant differences in relevant properties such as electric conductivity, specific surface area and electrochemical double layer capacitance. The performance stability of the felts within 2000 charge-discharge cycles conducted in lab-scale single-cell is evaluated from 4-point characterization before the cycling and after each 1000 cycles. Significant deterioration of electrocatalytic activity is observed for commercially activated polyacrylonitrile-based negative electrode, whereas the in-house activated rayon-based negative electrode provides stable performance over the whole tested period. A comprehensive post-mortem characterization is performed to identify the causes of different durability of both negative electrodes. X-ray photoelectron spectroscopy analysis reveals very similar changes in surface functionalization by oxygen-containing groups for both felts; however, the decrease of sp2-hybridized carbon and simultaneous increase of sp3-hybridized one is significantly higher for the unstable polyacrylonitrile-based felt. Although the performance deterioration of the polyacrylonitrile-based felt cannot be related to the decrease of the surface area or double-layer capacitance, the high surface area of activated rayon-based felt most probably contributes to its excellent performance stability. © 2019 Elsevier B.V.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/LO1402" target="_blank" >LO1402: CENTEM+</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Power Sources

ISSN

0378-7753

e-ISSN

—

Svazek periodika

414

Číslo periodika v rámci svazku

28. únor 2019

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

354-365

Kód UT WoS článku

000458709900043

EID výsledku v databázi Scopus

2-s2.0-85059832261