High‐Rate Polymeric Redox in MXene‐Based Superlattice‐Like Heterostructure for Ammonium Ion Storage

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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Publication Details

Journal
Advanced Energy Materials
Published
2024-09-03
DOI
https://doi.org/10.1002/aenm.202402715
Citations
13
Primary Topic
MXene and MAX Phase Materials
Type
article
Field-Weighted Citation Impact
1.52

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article

High‐Rate Polymeric Redox in MXene‐Based Superlattice‐Like Heterostructure for Ammonium Ion Storage

Hongjun Liu, Jaehoon Choi, De‐en Jiang, Marnix Wagemaker et al.
13 citations
Advanced Energy Materials
MXene and MAX Phase Materials
1.52
article

High‐Rate Polymeric Redox in MXene‐Based Superlattice‐Like Heterostructure for Ammonium Ion Storage

Hongjun Liu, Jaehoon Choi, De‐en Jiang, Marnix Wagemaker, Bart Boshuizen, Simon Fleischmann, Guillermo Carlos Bazan, Glenn Quek, Ricardo Javier Vázquez, Dingding Ren, Xuehang Wang, Bjørn‐Ove Fimland, Lars J. Bannenberg, Chaofan Chen, Ruipeng Li
article en
13 citations

Abstract

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.

Advanced Energy MaterialsVol. 14(42)
Karlsruhe Institute of Technology (DE), National University of Singapore (SG), Vanderbilt University (US), Brookhaven National Laboratory (US), Norwegian University of Science and Technology (NO), Indiana University Bloomington (US), Helmholtz-Institute Ulm (DE), Delft University of Technology (NL)
National Science Foundation, U.S. Department of Energy, National University of Singapore, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Norges Forskningsråd, Helmholtz Association, Office of Science, Office of Naval Research, Division of Chemistry
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Openalex Percentile: Top 14%
MXene and MAX Phase Materials
1.52
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