期刊
CHEMICAL ENGINEERING JOURNAL
卷 428, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131114
关键词
Ionization-bombardment assisted deposition; MXene; Heterostructure; Micro-supercapacitor
资金
- Natural Science Basic Research Plan in Shaanxi Province of China [2019ZDLGY16-08, 2019ZDLGY16-03, 2019ZDLGY16-02]
- Youth Science and Technology Nova Program of Shaanxi Province [2020KJXX-068]
- Fundamental Research Funds for the Central Universities [JBF201101]
The study presents a SiC/MXene heterostructure synthesized by ionization-bombardment deposition, improving the energy density of MXene micro-supercapacitors. The SiC nanomesh provides a conductive network and support for the MXene film, increasing ion storage space and creating an interconnected path for sodium ion conduction.
Improving the energy density of MXene micro-supercapacitors (MSCs) is still a challenge because the MXene nanosheets will easily agglomerate, leading to irreversible reduction of capacity. We present SiC/MXene heterostructure by ionization-bombardment assisted deposition synthesis. Under high voltage, C-C bond and Si-O bond are broken by electron bombardment. After arc sintering, C atom and Si atom form stable Si-C bond with lower bond energy, and then form SiC nanocrystals. Furthermore, SiC nanocrystals were patterned into mesoporous SiC nanonesh to enhance the specific surface area. The surface of SiC framework is full of charge, which makes the MXene nanosheets uniformly deposited and self-assembled to form heterostructure. SiC/MXene heterostructure has low barrier, strong bonding force and fast electron migration rate. SiC nanomesh provide a conductive network, and also serve as a framework to support the MXene film, increasing ion storage space, creating an interconnected path for the conduction of Na ions. The specific capacity of the MXene/SiC MSC is up to 97.8 mF cm-2 at a current density of 1 A cm-2. The fabrication of high-performance nanostructures leads to large-scale production and micro-energy storage devices.
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