材料科学
氧化还原
超晶格
异质结
离子
铵
化学工程
纳米技术
光电子学
有机化学
化学
冶金
工程类
作者
Chaofan Chen,Glenn Quek,Hongjun Liu,Lars J. Bannenberg,Ruipeng Li,Jaehoon Choi,Dingding Ren,Ricardo Javier Vázquez,Bart Boshuizen,Bjørn‐Ove Fimland,Simon Fleischmann,Marnix Wagemaker,De‐en Jiang,Guillermo C. Bazan,Xuehang Wang
标识
DOI:10.1002/aenm.202402715
摘要
Abstract Achieving both high redox activity and rapid ion transport is a critical and pervasive challenge in electrochemical energy storage applications. This challenge is significantly magnified when using large‐sized charge carriers, such as the sustainable ammonium ion (NH 4 + ). A self‐assembled MXene/n‐type conjugated polyelectrolyte (CPE) superlattice‐like heterostructure that enables redox‐active, fast, and reversible ammonium storage is reported. The superlattice‐like structure persists as the CPE:MXene ratio increases, accompanied by a linear increase in the interlayer spacing of MXene flakes and a greater overlap of CPEs. Concurrently, the redox activity per unit of CPE unexpectedly intensifies, a phenomenon that can be explained by the enhanced de‐solvation of ammonium due to the increased volume of 3 Å‐sized pores, as indicated by molecular dynamic simulations. At the maximum CPE mass loading (MXene:CPE ratio = 2:1), the heterostructure demonstrates the strongest polymeric redox activity with a high ammonium storage capacity of 126.1 C g −1 and a superior rate capability at 10 A g −1 . This work unveils an effective strategy for designing tunable superlattice‐like heterostructures to enhance redox activity and achieve rapid charge transfer for ions beyond lithium.
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