期刊
DESALINATION
卷 486, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.desal.2020.114407
关键词
Polymeric conformational effect; Interchain-action; Capacitive deionization performance; Graphene oxide/polypyrrole composite electrode
资金
- National Key Research and Development Program of China [2018YFE0196000, 2018YFC0408002]
- Special Fundation for Basic Scientific Research Business of Central Public Research Institutes [K-JBYWF-2019-T07, K-JBYWF-2019-T05]
- Key Scientific & Technological Support Projects of Tianjin Science and Technology Plan [18YFZCSF00320]
Exploitation of novel faradic materials is an alternative implementation for solving the problem of poor specific electrosorption capacity that conventional carbon materials are encountered in capacitive deionization. Particularly, composite electrode is just a suitable choice because of its potentially high ion-storage ability. Herein, a cyclic voltammetric treatment method with different low limit of potential window was used to manipulate the polymeric conformation and doping level of graphene oxide/polypyrrole (GO/PPy) composite electrode. Based on it, the effect of polymeric structure on the electrosorption performance was systematically studied. When the low limit of potential window is shifted negatively enough, the irreversible polymeric conformational shrinks of GO/PPy are promoted, which not only hinders the insertion process of ions, but also decreases the doping level of polymer due to the intensive interchain-action produced by more entangled polymeric chain. Thus, the number of intercalated ions should decrease, which is expressed by electrochemical impedance spectroscopy (EIS) results and is proportional to the electrosorption capacity of GO/PPy composite electrode in membrane capacitive deionization (MCDI) process. Our work suggests that the less packing density, higher doping level and more charge delocalization on PPy backbone in electrode are beneficial to enhance its capacitive deionization performance.
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