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|
| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Grand Ballroom |
| Time |
10월 18일 (목요일) 11:00~12:30 |
| Code |
MAT.P-352 |
| Subject |
Metal Organic Framework with Omni-Valent Cation Storage for Fast and Charge-Efficient Ion Removal of Capacitive Deionization |
| Authors |
Seungyeon Choi, Jang Wook Choi*
School of Chemical and Biological Engineering, Seoul National University, Korea
|
| Abstract |
Capacitive deionization (CDI) that engages porous carbon electrodes is one of the well-established energy-efficient desalination techniques. Nevertheless, the desalination performance such as ion removal capacity and charge efficiency is still limited due to the reverse adsorption of co-ions, which occurs to meet charge neutrality. Herein, an asymmetric CDI is introduced by pairing metal organic framework (MOF) and porous carbon electrodes. The exclusive intercalation of cations into the MOF prevents the reverse adsorption of co-ions (anions), thus significantly improving ion removal capacity (23.2 mg g-1) and charge efficiency (75.8%).Besides, diverse monovalent and divalent cations can be captured into the A sites of the MOF at similar redox potentials. Moreover, cations are intercalated in the hydrated forms, facilitating fast desalination by reducing the desolvation energy penalty at the electrode-water interface. The asymmetric CDI also exhibits voltage-insensitive deionization behavior and keeps pH within the limited range. This study offers a new design principle in CDI, that is, the integration of a crystal structure with large ionic channels that enable the hydrated intercalation of ions in a fast and exclusive manner. |
| E-mail |
csy0632@gmail.com |
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122nd General Meeting of the KCS