1. Enhanced sodium-storage performances of crumpled MXene nanosheets via alkali treatment–induced active ammonium ions.
- Author
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Yao, Yiwei, Ma, Yuan, Chen, Chi, Zhu, Kai, Wang, Guiling, Cao, Dianxue, and Yan, Jun
- Subjects
- *
AMMONIUM ions , *NANOSTRUCTURED materials , *ELECTRIC batteries , *SODIUM ions , *ION transport (Biology) , *ALKALINE solutions , *CHEMICAL kinetics - Abstract
Following the ammonia treatment, the pores created by the folds allow for electrolyte storage and facilitate ion transport. The interlayer spacing between MXene nanosheets widens due to the volume increase when water freezes. The generous ion transport paths and redox-active ammonium ions offer higher specific capacity and faster reaction kinetics. [Display omitted] Ti 3 C 2 T x MXene demonstrates excellent potential as an anode material for sodium-ion capacitors. However, the narrow interlayer spacing and self-stacking phenomenon limit its applicability. In this study, we demonstrate an easy two-step method involving freezing and crumpling of MXene nanosheets to improve their Na-ion storage via the addition of ammonium ions (referred to as FCM nanosheets). Flat MXene particles aggregate and undergo folding in an alkaline solution. Ammonium ions can penetrate the gaps between MXene nanosheets, expanding interlayer spaces and inducing the formation of folds. Compared to MXene nanosheets, FCM nanosheets exhibit improved ion transfer kinetics and additional high capacity owing to the intercalated ammonium ions. The manufactured FCM anode exhibits remarkable electrochemical properties, including a high specific capacity of 313 mAh g−1 and stability over 15,000 cycles. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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