SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2024, Vol. 71 ›› Issue (7): 217-224.DOI: 10.1016/j.cjche.2024.03.029

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Synergistically constructed lamination-like network of redox-active polyimide and MXene via π-π interactions for aqueous NH4+ storage

Jing He1, Hongye Xuan1, Jing Jin1, Ke Yu1, Changyao Liyang1, Lintong Hu1, Minjie Shi1,2, Chao Yan1   

  1. 1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    2. Jiangsu New Yangzi Shipbuilding Co., Ltd, Jingjiang 214532, China
  • Received:2023-10-24 Revised:2024-03-15 Online:2024-08-30 Published:2024-07-28
  • Contact: Minjie Shi,E-mail:shiminjie@just.edu.cn;Chao Yan,E-mail:chaoyan@just.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52002157) and the Undergraduate Research & Practice Innovation Program of Jiangsu Province (202310289033Z).

Synergistically constructed lamination-like network of redox-active polyimide and MXene via π-π interactions for aqueous NH4+ storage

Jing He1, Hongye Xuan1, Jing Jin1, Ke Yu1, Changyao Liyang1, Lintong Hu1, Minjie Shi1,2, Chao Yan1   

  1. 1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    2. Jiangsu New Yangzi Shipbuilding Co., Ltd, Jingjiang 214532, China
  • 通讯作者: Minjie Shi,E-mail:shiminjie@just.edu.cn;Chao Yan,E-mail:chaoyan@just.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (52002157) and the Undergraduate Research & Practice Innovation Program of Jiangsu Province (202310289033Z).

Abstract: As a nonmetallic charge carrier, ammonium ion (NH4+) has garnered significant attention in the construction of aqueous batteries due to its advantages of low molar mass, small hydration size and rapid diffusion in aqueous solutions. Polymers are a kind of potential electro-active materials for aqueous NH4+ storage. However, traditional polymer electrodes are typically created by covering the bulky collectors with excessive additives, which could lead to low volume capacity and unsatisfactory stability. Herein, a nanoparticle-like polyimide (PI) was synthesized and then combined with MXene nanosheets to synergistically construct an additive-free and self-standing PI@MXene composite electrode. Significantly, the redox-active PI nanoparticles are enclosed between conductive MXene flakes to create a 3D lamination-like network that promotes electron transmission, while the π-π interactions existing between PI and MXene contribute to the enhanced structural integrity and stability within the composite electrode. As such, it delivers superior aqueous NH4+ storage behaviors in terms of a notable specific capacity of 110.7 mA·h·cm–3 and a long lifespan with only 0.0064% drop each cycle. Furthermore, in-situ Raman and UV–Vis examinations provide evidence of reversible and stable redox mechanism of the PI@MXene composite electrode during NH4+ uptake/removal, highlighting its significance in the area of electrochemical energy storage.

Key words: Synergetic coupling, Composite materials, Polyimide, Energy storage, Aqueous ammonium ion batteries

摘要: As a nonmetallic charge carrier, ammonium ion (NH4+) has garnered significant attention in the construction of aqueous batteries due to its advantages of low molar mass, small hydration size and rapid diffusion in aqueous solutions. Polymers are a kind of potential electro-active materials for aqueous NH4+ storage. However, traditional polymer electrodes are typically created by covering the bulky collectors with excessive additives, which could lead to low volume capacity and unsatisfactory stability. Herein, a nanoparticle-like polyimide (PI) was synthesized and then combined with MXene nanosheets to synergistically construct an additive-free and self-standing PI@MXene composite electrode. Significantly, the redox-active PI nanoparticles are enclosed between conductive MXene flakes to create a 3D lamination-like network that promotes electron transmission, while the π-π interactions existing between PI and MXene contribute to the enhanced structural integrity and stability within the composite electrode. As such, it delivers superior aqueous NH4+ storage behaviors in terms of a notable specific capacity of 110.7 mA·h·cm–3 and a long lifespan with only 0.0064% drop each cycle. Furthermore, in-situ Raman and UV–Vis examinations provide evidence of reversible and stable redox mechanism of the PI@MXene composite electrode during NH4+ uptake/removal, highlighting its significance in the area of electrochemical energy storage.

关键词: Synergetic coupling, Composite materials, Polyimide, Energy storage, Aqueous ammonium ion batteries