Enabling Superior Sodium Capture for Efficient Water Desalination by a Tubular Polyaniline Decorated with Prussian Blue Nanocrystals

Enabling Superior Sodium Capture for Efficient Water Desalination by a Tubular Polyaniline Decorated with Prussian Blue Nanocrystals

Advanced Materials

10.1002/adma.201907404

Wenhui Shi, Xiaoyue Liu, Tianqi Deng, Shaozhuan Huang, Meng Ding, Xiaohe Miao, Chongzhi Zhu, Yihan Zhu, Wenxian Liu, Fangfang Wu, Congjie Gao, Shuo-Wang Yang, Hui Ying Yang, Jiangnan Shen, Xiehong Cao

Prussian blue

12 July 2020

Shi, W., Liu, X., Deng, T., Huang, S., Ding, M., Miao, X., Zhu, C., Zhu, Y., Liu, W., Wu, F., Gao, C., Yang, S.‐W., Yang, H. Y., Shen, J., Cao, X., Enabling Superior Sodium Capture for Efficient Water Desalination by a Tubular Polyaniline Decorated with Prussian Blue Nanocrystals. Adv. Mater. 2020, 32, 1907404. https://doi.org/10.1002/adma.201907404

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.

Publisher Copyright

This research / project is supported by the Agency for Science, Technology and Research (A*STAR) of Singapore - Theoretical Prediction on Hybrid Thermoelectric Materials for Ambient Applications
Grant Reference no. : 1527200024

This is the peer reviewed version of the following article: Shi, W., Liu, X., Deng, T., Huang, S., Ding, M., Miao, X., Zhu, C., Zhu, Y., Liu, W., Wu, F., Gao, C., Yang, S.‐W., Yang, H. Y., Shen, J., Cao, X., Enabling Superior Sodium Capture for Efficient Water Desalination by a Tubular Polyaniline Decorated with Prussian Blue Nanocrystals. Adv. Mater. 2020, 32, 1907404. https://doi.org/10.1002/adma.201907404, which has been published in final form at 10.1002/adma.201907404. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions

https://oar.a-star.edu.sg/communities-collections/articles/17585

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