Superprotonic Conductivity of MOFs Confining Zwitterionic Sulfamic Acid as Proton Source and Conducting Medium |
| |
| Authors: | Dr Amitosh Sharma Dr Jaewoong Lim Seonghwan Lee Dr Seungwan Han Dr Junmo Seong Prof?Dr Seung Bin Baek Prof?Dr Myoung Soo Lah |
| |
| Institution: | 1. Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea
These authors contributed equally to this work.;2. Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 Republic of Korea |
| |
| Abstract: | A few metal–organic frameworks (MOFs), which typically use strong acids as proton sources, display superprotonic conductivity (≈10?1 S cm?1); however, they are rare due to the instability of MOFs in highly acidic conditions. For the first time, we report superprotonic conductivity using a moderately acidic guest, zwitterionic sulfamic acid (HSA), which is encapsulated in MOF-808 and MIL-101. HSA acts not only as a proton source but also as a proton-conducting medium due to its extensive hydrogen bonding ability and zwitterion effect. A new sustained concentration gradient method results in higher HSA encapsulation compared to conventional methods, producing 10HSA@MOF-808-(bSA)2 and 8HSA@MIL-101. These MOFs show impressive superprotonic conductivity of 2.47×10?1 and 3.06×10?1 S cm?1, respectively, at 85 °C and 98 % relative humidity, and maintain stability for 7 days. |
| |
| Keywords: | Metal–Organic Framework (MOF) Proton Conducting Medium Proton Source Sulfamic Acid Superprotonic Conductivity |
|
|
