Journal
ENERGY STORAGE MATERIALS
Volume 27, Issue -, Pages 17-24Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2020.01.008
Keywords
Micro-supercapacitors; 3D electrodes; On-chip integration; Areal energy density; Injection technology
Funding
- China Scholarship Council (CSC)
- European Social Fund (ESF)
- German Research Foundation DFG (Gottfried Wilhelm Leibniz Program)
- National Natural Science Foundation of China [21576034]
- Innovative Research Team of Chongqing [CXTDG201602014]
- State Education Ministry [106112016CDJZR135506]
- Fundamental Research Funds for the Central Universities [106112016CDJZR135506]
- Agency of Science, Technology and Research (A*STAR) [ICES/17-4G4B01]
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The great development of lightweight and portable smart electronic devices has significantly stimulated the interests in exploring and developing miniaturized energy storage systems. High-performance micro-super-capacitors (MSCs) with three-dimensional (3D) nanostructures show a great potential to improve energy storage capability, and these types of MSCs are regarded as ideal stand-alone power sources for smart microelectronics. Here, Cu0.56Co2.44O4@MnO2 core-shell nanoflowers and carbon nanotubes are integrated into a 3D hybrid asymmetric MSC with a fast, convenient, and scalable production fashion. Due to the hierarchical structure of the 3D electrodes and active materials, the hybrid MSC exhibits an improved specific areal capacitance of 665.3 mF cm(-2) at 3.2 mA cm(-2) and an excellent cycling performance of 89.8% retention after 8000 cycles. The MSC also shows an ultrahigh energy density of 182.3 mu W h cm(-2), which is higher than almost all the previously reported energy density values of on-chip interdigital-electrode MSCs. The efficient fabrication methodology of both the materials and the device demonstrated in this work show great potential in developing high-performance 3D MSCs.
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