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High-performance all-solid-state flexible micro-supercapacitor arrays with layer-by-layer assembled MWNT/MnO(x)
Geumbee Lee1, Daeil Kim, Junyeong Yun
1KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 136-701, Republic of Korea. jeongsha@korea.ac.kr.
This study developed high-performance flexible micro-supercapacitors (MSCs) using a novel multi-walled carbon nanotube (MWNT) and manganese oxide nanoparticle composite. These MSCs demonstrate significantly enhanced capacitance and stability for powering electronic devices.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Flexible energy storage devices are crucial for portable electronics.
- Micro-supercapacitors (MSCs) offer high power density but require performance enhancements.
- Advanced nanomaterials are key to improving MSC performance and flexibility.
Purpose of the Study:
- To fabricate high-performance planar-type flexible micro-supercapacitor (MSC) arrays.
- To investigate the effect of a multi-walled carbon nanotube (MWNT) and manganese oxide nanoparticle (MnOx NP) composite layer on MSC performance.
- To demonstrate the practical application of these flexible MSCs in powering electronic devices.
Main Methods:
- Fabrication of flexible MSCs using gold electrodes.
- Layer-by-layer (LbL) assembly of functionalized MWNTs (amine and carboxylic acid groups).
- Coating of a hydrothermally synthesized MWNT-COOH/MnOx NP composite on the MWNT film.
- Electrochemical characterization including capacitance, coulombic efficiency, and cycling stability.
- Testing of serially connected MSC arrays for powering light-emitting diodes (LEDs).
Main Results:
- The MWNT-COOH/MnOx NP composite top layer dramatically enhanced MSC performance.
- Achieved a volumetric capacitance of 50 F cm⁻³ at 10 mV s⁻¹ and near 100% coulombic efficiency.
- MSCs retained approximately 88.3% of their capacitance after 10,000 cycles.
- Demonstrated stable electrochemical properties after 1000 bending cycles on a polyethylene terephthalate (PET) film.
- Successfully powered various LEDs using serially connected MSC arrays.
Conclusions:
- The developed flexible MSCs exhibit superior electrochemical performance compared to those without the composite layer.
- The MWNT-COOH/MnOx NP composite is an effective strategy for enhancing MSC energy storage capabilities.
- These flexible MSCs show great potential for applications in flexible and wearable electronics.
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