Superprotonic conductivity of a UiO-66 framework functionalized with sulfonic acid groups by facile postsynthetic oxidation.
Facile postsynthetic oxidation of the thiol-laced UiO-66-type framework UiO-66(SH)2 enabled the generation of UiO-66(SO3 H)2 with sulfonic acid groups covalently linked to the backbone of the system. The oxidized material exhibited a superprotonic conductivity of 8.4×10(-2)  S cm(-1) at 80 °C and 90 % relative humidity, and long-term stability of the conductivity was observed. This level of conductivity exceeds that of any proton-conducting MOF reported to date and is equivalent to the conductivity of the most effective known electrolyte, Nafion.
Department of Chemistry, Korea University, Seoul 136-713 (Korea).
Won Ju
WJ
Phang
Hyuna
H
Jo
Woo Ram
WR
Lee
Jeong Hwa
JH
Song
Kicheon
K
Yoo
BongSoo
B
Kim
Chang Seop
CS
Hong
metal-organic frameworks; postsynthetic oxidation; proton-conducting materials; sulfonic acid groups; thiol groups