Building durable aqueous K-ion capacitors based on MXene family
Obtaining stable aqueous K-ion capacitors is still challenging due to the cathode materials tended to structurally collapse after long-term cycling during large-radius K-ion insertion/extraction. In this work, three different typical MXene electrodes, i.e., Nb2C, Ti2C, and Ti3C2 were individually in...
Main Authors: | , , , , , , , , , |
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Format: | Article |
Language: | English |
Published: |
Tsinghua University Press
2022-06-01
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Series: | Nano Research Energy |
Subjects: | |
Online Access: | https://www.sciopen.com/article/10.26599/NRE.2022.9120002 |
Summary: | Obtaining stable aqueous K-ion capacitors is still challenging due to the cathode materials tended to structurally collapse after long-term cycling during large-radius K-ion insertion/extraction. In this work, three different typical MXene electrodes, i.e., Nb2C, Ti2C, and Ti3C2 were individually investigated upon their electrochemical behaviors for potassium-ion (K-ion) storage. All these MXene materials exhibited pseudocapacitive-dominated behaviors, fast kinetics, and durable K-ion storage, delivering superior performance compared with other K-ion host materials. According to the experimental results, it could be ascribed to the intrinsically large interlayer distance for K-ion transport and the superb structural stability of MXene even subjected to long-term potassiation/depotassiation process. |
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ISSN: | 2791-0091 2790-8119 |