Journal
NANO ENERGY
Volume 74, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104928
Keywords
On-chip electronics; Micro-supercapacitors; MXene; Potential window; Energy density
Categories
Funding
- National Natural Science Foundation of China [51977185, 51972277]
- Sichuan Province Science and Technology Support Program [2020ZDYF2833]
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On-chip micro-supercapacitors (MSCs) are one of the most promising devices to be integrated into micro-/nanoscale electronic devices for offering sufficient peak power and energy support. However, low operate voltage and limited energy density greatly inhibit their wider practical application. Herein, high-voltage on-chip MSCs based on Ti3C2Tx MXene as a negative electrode and activated carbon as a positive electrode are designed and are simply manufactured via a novel cutting-spraying method. Through solving the excessive polarization of MXene, a single asymmetric on-chip MSCs can deliver a potential window up to 1.6 V in neutral electrolyte (PVA/Na2SO4), and share a high areal capacitance of 7.8 mF cm(-2) (a stack specific capacitance of 36.5 F cm(-3)) and a greatly improved energy density of 3.5 mWh cm(-3) at a power density of 100 mW cm(-3 ), which are much higher than other on-chip energy storage counterparts. Besides, MSCs show an excellent capacity retention (remaining 91.4% after 10 000 cycles). More importantly, MSCs can be easily enlarged as highly integrated array in series and/or in parallel on the silicon wafers. Evidently, this study opens up new avenues for developing high-voltage MXene-based MSCs used in on-chip electronics and portable devices.
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