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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Metal Organic Framework with Omni-Valent Cation Storage for Fast and Charge-Efficient Ion Removal of Capacitive Deionization

2018년 8월 21일 14시 49분 15초
MAT.P-352 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 18일 (목요일) 11:00~12:30
Material Chemistry
저자 및
Seungyeon Choi, Jang Wook Choi*
School of Chemical and Biological Engineering, Seoul National University, Korea
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.