TY - JOUR
T1 - Fluorine-Containing Poly(Fluorene)-Based Anion Exchange Membrane with High Hydroxide Conductivity and Physicochemical Stability for Water Electrolysis
AU - Lim, Haeryang
AU - Han, Gyeong Ho
AU - Lee, Dae Hwan
AU - Shin, Giwon
AU - Choi, Jinhyuk
AU - Ahn, Sang Hyun
AU - Park, Taiho
N1 - Publisher Copyright:
© 2024 Wiley-VCH GmbH.
PY - 2024/8/8
Y1 - 2024/8/8
N2 - Improving the hydroxide conductivity and dimensional stability of anion exchange membranes (AEMs) while retaining their high alkaline stability is necessary to realize the commercialization of AEM water electrolysis (AEMWE). A strategy for improving the hydroxide conductivity and dimensional stability of AEMs by inserting fluorine atoms in the core structure of the backbone is reported, which not only reduces the glass transition temperature of the polymer due to steric strain, but also induces distinct phase separation by inducing polarity discrimination to facilitate the formation of ion transport channels. The resulting PFPFTP-QA AEM with fluorine into the core structure shows high hydroxide conductivity (>159 mS cm−1 at 80 °C), favorable dimensional stability (>25% at 80 °C), and excellent alkaline stability for 1000 h in 2 m KOH solution at 80 °C. Moreover, the PFPFTP-QA is used to construct an AEMWE cell with a platinum group metal (PGM)–free NiFe anode, which exhibits the current density of 6.86 A cm−2 at 1.9 V at 80 °C, the highest performance in Pt/C cathode and PGM-free anode reports so far and operates stably for over 100 h at a constant current of 0.5 A cm−2.
AB - Improving the hydroxide conductivity and dimensional stability of anion exchange membranes (AEMs) while retaining their high alkaline stability is necessary to realize the commercialization of AEM water electrolysis (AEMWE). A strategy for improving the hydroxide conductivity and dimensional stability of AEMs by inserting fluorine atoms in the core structure of the backbone is reported, which not only reduces the glass transition temperature of the polymer due to steric strain, but also induces distinct phase separation by inducing polarity discrimination to facilitate the formation of ion transport channels. The resulting PFPFTP-QA AEM with fluorine into the core structure shows high hydroxide conductivity (>159 mS cm−1 at 80 °C), favorable dimensional stability (>25% at 80 °C), and excellent alkaline stability for 1000 h in 2 m KOH solution at 80 °C. Moreover, the PFPFTP-QA is used to construct an AEMWE cell with a platinum group metal (PGM)–free NiFe anode, which exhibits the current density of 6.86 A cm−2 at 1.9 V at 80 °C, the highest performance in Pt/C cathode and PGM-free anode reports so far and operates stably for over 100 h at a constant current of 0.5 A cm−2.
KW - anion exchange membrane
KW - aryl ether-free polymer
KW - fluorine-containing structure
KW - morphology
KW - water electrolysis
UR - http://www.scopus.com/inward/record.url?scp=85187933110&partnerID=8YFLogxK
U2 - 10.1002/smll.202400031
DO - 10.1002/smll.202400031
M3 - Article
C2 - 38497894
AN - SCOPUS:85187933110
SN - 1613-6810
VL - 20
JO - Small
JF - Small
IS - 32
M1 - 2400031
ER -