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Anion-selective materials with 1,4-diazabicyclo[2.2.2]octane functional groups for advanced alkaline water electrolysis

SYSNO ASEP	0477342
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Anion-selective materials with 1,4-diazabicyclo[2.2.2]octane functional groups for advanced alkaline water electrolysis
Author(s)	Hnát, J. (CZ) Plevová, M. (CZ) Žitka, Jan (UMCH-V)_RID Paidar, M. (CZ) Bouzek, K. (CZ)
Source Title	Electrochimica acta. - : Elsevier - ISSN 0013-4686 Roč. 248, 10 September (2017), s. 547-555
Number of pages	9 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	water electrolysis ; alkaline environment ; anion-selective membrane
Subject RIV	CG - Electrochemistry
OECD category	Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
R&D Projects	GA16-20728S GA ČR - Czech Science Foundation (CSF)
Institutional support	UMCH-V - RVO:61389013
UT WOS	000409525300060
EID SCOPUS	85026731806
DOI	10.1016/j.electacta.2017.07.165
Annotation	In this study a novel alkaline polymer electrolyte membrane is presented, based on polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (PSEBS) functionalized by the 1,4-diazabicyclo[2.2.2]octane (DABCO) to be used as an electrode compartment separator as well as a catalytic layer binder in the alkaline water electrolysis process with the aim to reduce the concentration of KOH in the liquid electrolyte and to allow the construction of an efficient zero gap-type cell. This material was selected due to the promising properties of both individual components resulting from their molecular structure. The prepared membrane was thoroughly characterized with regard to its stability in an alkaline environment. The prepared membrane showed an ion-exchange capacity value of 0.76 mmol g-1dry membrane and ionic conductivity of 7.5 S m-1 at 30 °C. Excellent membrane durability was confirmed for a KOH concentration range up to 10 wt.% and temperature up to 50 °C. Subsequently, the polymer electrolyte was tested in a laboratory alkaline water electrolyser using 10 wt.% KOH as a circulating medium showing promising current density of 150 mA cm-2 at 40 °C. In a 150-hour experiment the PSEBS functionalized by DABCO manifested very good stability and high potential for optimization for this process as it showed no signs of chemical degradation.
Workplace	Institute of Macromolecular Chemistry
Contact	Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
Year of Publishing	2018

Number of the records: 1