Lee, Donggyu Yun, Hongryeol Kim, Namju Ko, Nayeon Youn, Jeongwon Cheon, Gayoung Kim, Jin Young Hong, Chang Seop 2025-08-31T03:30:31Z 2025-08-31T03:30:31Z 2025-08-27 2025-08 1944-8244 https://pubs.kist.re.kr/handle/201004/153084 While strategies for proton conductivity enhancement are required, appropriate synthetic procedures are still sought. Herein, we synthesized a porous organic polymer, POP-Me40, through the judicial selection of functional groups with varying electronic effects. Postsynthetic sulfonation of POP-Me40 was conducted to produce POP-Me40-S. This material demonstrates a high conductivity of 1.42 x 10-1 S cm-1 at 80 degrees C and 90% relative humidity along with a low activation energy of 0.094 eV, consistent with the Grotthuss proton conduction mechanism. Subsequent impregnation of sulfonic acid groups in POP-Me40-S afforded a doubly acidified polymer, POP-Me40-S-SA, showing an exceptional proton conductivity of 1.91 x 10-1 S cm-1 under the same conditions. This value represents a 780000-fold increase in conductivity with respect to its unmodified precursor, POP-Me40, setting a record among porous materials. Furthermore, POP-Me40-S-SA exhibits an activation energy of 0.063 eV, one of the lowest reported, indicating the formation of highly efficient proton transport pathways within its framework channels. English American Chemical Society Drastic Enhancement of Proton Conductivity in a Porous Organic Polymer Conductor via Dual Postsynthetic Acidifications Article 10.1021/acsami.5c11522 1 ACS Applied Materials & Interfaces, v.17, no.34, pp.49000 - 49007 ACS Applied Materials & Interfaces 17 34 49000 49007 N scie scopus 001551092900001 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article FRAMEWORKS CRYSTALLINE MEMBRANES CATALYST porous organic polymers proton conductivity sulfonation impregnation postsynthetic modification