Affiliation:
1. Shanghai Key Laboratory of Magnetic Resonance School of Physics and Electronic Science East China Normal University Shanghai 200241 China
2. School of Materials Science and Engineering Qingdao University of Science and Technology Qingdao Shandong 266042 China
3. Marine Science and Technology College Zhejiang Ocean University Zhoushan Zhejiang 316022 China
4. School of Materials and Chemistry University of Shanghai for Science and Technology Shanghai 200093 China
Abstract
AbstractDefect engineering is recognized as an attractive method for modulating the electronic structure and physicochemical characteristics of carbon materials. Exploiting heteroatom‐doped porous carbon with copious active sites has attracted great attention for capacitive deionization (CDI). However, traditional methods often rely on the utilization of additional heteroatom sources and strong corrosive activators, suffering from low doping efficiency, insufficient doping level, and potential biotoxicity. Herein, hydrogen‐bonded organic frameworks (HOFs) are employed as precursors to synthesize N, O co‐doped porous carbon via a simple and green reverse defect engineering strategy, achieving controllable heavy doping of heteroatoms. The N, O co‐doping triggers significant pseudocapacitive contribution and the surface pore structure supports the formation of the electric double layer. Therefore, when HOF‐derived N, O co‐doped carbon is used as CDI electrodes, a superior salt adsorption capacity of 32.29 ± 1.42 mg g−1 and an outstanding maximum salt adsorption rate of 10.58 ± 0.46 mg g−1 min−1 at 1.6 V in 500 mg L−1 NaCl solution are achieved, which are comparable to those of state‐of‐the‐art carbonaceous electrodes. This work exemplifies the effectiveness of the reverse nitrogen‐heavy doping strategy on improving the carbon structure, shedding light on the further development of rational designed electrode materials for CDI.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry