Polyaniline coated MOF-derived Mn2O3 nanorods for efficient hybrid capacitive deionization

Yanjiang Li; Yufeng Yin; Fengting Xie; Guangzhen Zhao; Lu Han; Li Zhang; Ting Lu; Mohammed A Amin; Yusuke Yamauchi; Xingtao Xu; Guang Zhu; Likun Pan

doi:10.1016/j.envres.2022.113331

Polyaniline coated MOF-derived Mn₂O₃ nanorods for efficient hybrid capacitive deionization

Environ Res. 2022 Sep;212(Pt C):113331. doi: 10.1016/j.envres.2022.113331. Epub 2022 Apr 25.

Authors

Yanjiang Li¹, Yufeng Yin¹, Fengting Xie¹, Guangzhen Zhao¹, Lu Han¹, Li Zhang¹, Ting Lu², Mohammed A Amin³, Yusuke Yamauchi⁴, Xingtao Xu⁵, Guang Zhu⁶, Likun Pan⁷

Affiliations

¹ Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes, Suzhou University, Suzhou, 234000, China.
² Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, China.
³ Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia.
⁴ International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan; Australian Institute for Bioengineering and Nanotechnology (AIBN) and School of Chemical Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia.
⁵ International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan. Electronic address: Xu.Xingtao@nims.go.jp.
⁶ Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes, Suzhou University, Suzhou, 234000, China. Electronic address: guangzhu@ahszu.edu.cn.
⁷ Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, China. Electronic address: lkpan@phy.ecnu.edu.cn.

PMID: 35472462
DOI: 10.1016/j.envres.2022.113331

Abstract

Mn-based oxides are efficient pseudocapacitive electrode materials and have been investigated for capacitive deionization (CDI). However, their poor conductivity seriously affects their desalination performance. In this work, polyaniline coated Mn₂O₃ nanorods (PANI/Mn₂O₃) are synthesized by oxidizing a Mn-based metal organic framework (MOF) and subsequent in-situ chemical polymerization. The polyaniline not only acts as a conductive network for faradaic reactions of Mn₂O₃, but also enhances the desalination rate. PANI/Mn₂O₃ has a specific capacitance of 87 F g^-1 (at 1 A g^-1), superior to that of Mn₂O₃ nanorod (52 F g^-1 at 1 A g^-1). The hybrid CDI cell constructed with a PANI/Mn₂O₃ cathode and an active carbon anode shows a high desalination capacity of 21.6 mg g^-1, superior recyclability with only 11.3% desalination capacity decay after 30 desalination cycles and fast desalination rate of 2.2 mg g^-1 min^-1. PANI/Mn₂O₃ is a potential candidate for high performance CDI applications.

Keywords: Capacitive deionization; Metal organic framework; Mn(2)O(3) nanorod; Polyaniline.