Abstract
As a nonmetallic charge carrier,ammonium ion (NH4+) has garnered significant attention in the con-struction 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 syn-ergistically 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 electro-chemical energy storage.
基金项目
National Natural Science Foundation of China(52002157)
Undergraduate Research&Practice Innovation Program of Jiangsu Province(202310289033Z)
万方数据