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Enabling Superior Sodium Capture for Efficient Water Desalination by a Tubular Polyaniline Decorated with Prussian Blue Nanocrystals
Author(s) -
Shi Wenhui,
Liu Xiaoyue,
Deng Tianqi,
Huang Shaozhuan,
Ding Meng,
Miao Xiaohe,
Zhu Chongzhi,
Zhu Yihan,
Liu Wenxian,
Wu Fangfang,
Gao Congjie,
Yang ShuoWang,
Yang Hui Ying,
Shen Jiangnan,
Cao Xiehong
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201907404
Subject(s) - capacitive deionization , prussian blue , materials science , desalination , polyaniline , chemical engineering , faraday efficiency , nanocrystal , electrode , electrochemistry , nanotechnology , membrane , composite material , polymer , engineering , polymerization , biology , chemistry , genetics
The application of electrochemical energy storage materials to capacitive deionization (CDI), a low‐cost and energy‐efficient technology for brackish water desalination, has recently been proven effective in solving problems of traditional CDI electrodes, i.e., low desalination capacity and incompatibility in high salinity water. However, Faradaic electrode materials suffer from slow salt removal rate and short lifetime, which restrict their practical usage. Herein, a simple strategy is demonstrated for a novel tubular‐structured electrode, i.e., polyaniline (PANI)‐tube‐decorated with Prussian blue (PB) nanocrystals (PB/PANI composite). This composite successfully combines characteristics of two traditional Faradaic materials, and achieves high performance for CDI. Benefiting from unique structure and rationally designed composition, the obtained PB/PANI exhibits superior performance with a large desalination capacity (133.3 mg g −1 at 100 mA g −1 ), and ultrahigh salt‐removal rate (0.49 mg g −1 s −1 at 2 A g −1 ). The synergistic effect, interfacial enhancement, and desalination mechanism of PB/PANI are also revealed through in situ characterization and theoretical calculations. Particularly, a concept for recovery of the energy applied to CDI process is demonstrated. This work provides a facile strategy for design of PB‐based composites, which motivates the development of advanced materials toward high‐performance CDI applications.