Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 23, Pages 19682-19688Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03958
Keywords
micro-supercapacitors; volumetric energy densities; hierarchical pores; carbonization; interference lithography
Funding
- National Research Foundation of Korea [2011-0030253, 2017M1A3A3A02016667]
- Sogang University [201610050]
- National Research Foundation of Korea [2017M1A3A3A02016667] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Micro-supercapacitors (MSCs) are attractive for applications in next-generation mobile and wearable devices and have the potential to complement or even replace lithium batteries. However, many previous MSCs have often exhibited a low volumetric energy density with high-loading electrodes because of the nonuniform pore structure of the electrodes. To address this issue, we introduced a uniform-pore carbon electrode fabricated by 3D interference lithography. Furthermore, a hierarchical pore-patterned carbon (hPC) electrode was formed by introducing a micropore by chemical etching into the macropore carbon skeleton. The hPC electrodes were applied to solid-state MSCs. We achieved a constant volumetric capacitance and a corresponding volumetric energy density for electrodes of various thicknesses. The hPC MSC reached a volumetric energy density of approximately 1.43 mW h/cm(3). The power density of the hPC MSC was 1.69 W/cm(3). We could control the capacitance and voltage additionally by connecting the unit MSC cells in series or parallel, and we confirmed the operation of a light-emitting diode. We believe that our pore-patterned electrodes will provide a new platform for compact but high-performance energy storage devices.
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