期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 899, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163241
关键词
MXene; MnO2; Self-assembly; Positive electrode; Flexible device
资金
- National Key Research and Development Program of China [2018YFA0703702, 2020YFF0305404]
- National Natural Science Foundation of China [11874084]
- Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, Beijing, China
A hybrid MnO2/Ti3C2Tx cathode was fabricated using a simple filtration method, which showed higher electrochemical stability and excellent capacitance performance compared to pure Ti3C2Tx. The improved performance was mainly attributed to the charge transfer-induced work function enlargement at the Ti3C2Tx and MnO2 heterointerface. This work provides new insights for designing high-performance MXene-based cathode materials and devices for wearable electronics.
Two-dimensional (2D) MXene materials have significant potential applications in electrochemical energy storage. A Ti3C2Tx MXene film can be used as a high-performance electrode for a flexible supercapacitor owing to its flexibility and excellent rate capability. However, Ti3C2Tx is usually only used as a negative electrode material because it can be easily oxidized under positive (anodic) potential. Herein, we report a simple filtration method to fabricate a hybrid cathode by mixing a colloidal solution of 2D Ti3C2Tx nanosheets and 1D MnO2 nanobelts to form an alternating MnO2/Ti3C2Tx stacked structure. Compared with pure Ti3C2Tx, the hybrid cathode has higher electrochemical stability toward anodic oxidation. The MnO2/Ti3C2Tx hybrid cathode delivers a high gravimetric capacitance of 315 F g-1 at 10 mV s-1 and a good rate capability of 166 F g-1 at 100 mV s-1. The high stability of the MnO2/Ti3C2Tx hybrid cathode is mainly attributed to the charge transferinduced work function enlargement at the Ti3C2Tx and MnO2 heterointerface. Furthermore, a flexible asymmetric supercapacitor assembled using MnO2/Ti3C2Tx as the cathode and alkalized Ti3C2Tx as the anode delivers a high-voltage window up to 1.9 V. This work provides new insights for designing high-performance MXene-based cathode materials and devices for wearable electronics. (c) 2021 Elsevier B.V. All rights reserved.
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