Superprotonic conductivity of a UiO-66 framework functionalized with sulfonic acid groups by facile postsynthetic oxidation

Won Ju Phang; Hyuna Jo; Woo Ram Lee; Jeong Hwa Song; Kicheon Yoo; BongSoo Kim; Chang Seop Hong

doi:10.1002/anie.201411703

Superprotonic conductivity of a UiO-66 framework functionalized with sulfonic acid groups by facile postsynthetic oxidation

Angew Chem Int Ed Engl. 2015 Apr 20;54(17):5142-6. doi: 10.1002/anie.201411703. Epub 2015 Feb 27.

Authors

Won Ju Phang¹, Hyuna Jo, Woo Ram Lee, Jeong Hwa Song, Kicheon Yoo, BongSoo Kim, Chang Seop Hong

Affiliation

¹ Department of Chemistry, Korea University, Seoul 136-713 (Korea).

PMID: 25726943
DOI: 10.1002/anie.201411703

Abstract

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.

Keywords: metal-organic frameworks; postsynthetic oxidation; proton-conducting materials; sulfonic acid groups; thiol groups.