Enhanced proton conductivity by incorporating sulfonic acid groups into a zirconium-based metal-organic framework via ligand exchange

作者：Zheng, Jin-Yang; Wang, Qi-Ming; Jiang, Feng-Qi; Li, Yang-Lu; Huang, Xiao-Xiong; Sun, Xiao-Wen; Dong, Wen-Wen^*; Ba, Dan^*; Zhao, Jun^*; Li, Dong-Sheng

来源：Journal of Solid State Chemistry, 2023, 324: 124070.

DOI：10.1016/j.jssc.2023.124070

• Metal-organic framework
• Proton conductivity
• -SO3H group
• Ligand exchange

Herein, the postsynthetic ligand exchange process was adopted to construct a series of 1,4-naphthalenedicarboxylic acid (H2NDC) and 6-sulfonate-1,4-naphthalenedicarboxylic acid (H3SNDC) based Zr(IV)-MOFs (Zr-(NDC)(x)(SNDC)(1-x)). This strategy anchored functional sulfonic acid groups in the pore of the MOFs. Among them, Zr-(NDC)(0.3)(SNDC)(0.7) exhibited outstanding proton conductivity of 3.18 x 10(-4) S cm(-1) at 90 degrees C and 98% relative humidity (RH), which was approximately three orders of magnitude greater than that of pristine Zr-NDC. This work demonstrated a facile in situ ligand exchange approach for constructing functional group modified MOFs with high proton conductivity.