| Inkjet-printed planar microsupercapacitors based on MnO2 nanoflowers |
| کد مقاله : 1037-CNF |
| نویسندگان: |
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علی ساجدی مقدم، مصطفی غلامی، نعیمه ناصری * دانشگاه صنعتی شریف |
| چکیده مقاله: |
| The accelerated development of portable/wearable electronic devices and the internet of things (IoT) has stimulated the design of miniaturized, and flexible power sources with sufficient efficiency.1,2 Among various energy storage units, microsupercapacitors (MSCs) have shown great potential to power such systems due to their lightweight, diversified shapes, high power density, long cycling stability, and suitable energy density.3 The further development of high-performance MSCs highly relies on the adopted device fabrication approach. Herein, we demonstrate inkjet-printing technology for the fabrication of all-solid-state planar manganese oxide (MnO2)-based MSCs with high capacitance. Inkjet printing is an ideal method because it is a non-contact, precisely controlled deposition and additive printing process.4,5 MnO2 was synthesized via a simple reduction method followed by fast calcination treatment. Figure 1A reveals the nanoflower structure of MnO2 which is composed of ultrathin interconnected nanoflakes. The proper size of MnO2 nanoflowers (<500 nm) allows the formulation of inkjet-printable inks without clogging issues. Concentrated (6 mg mL-1) and inkjet-printable ink was developed in an alcohol-based medium (Figure 1B). Successful inkjet printing was achieved by optimizing the rheological features (viscosity and surface tension) of developed ink. The non-contact and mask-free nature of inkjet-printing technology enables printing complex and arbitrary structures (Figure 1C). The inkjet-printable ink of MnO2 was then utilized to create planar MSCs with the interdigitated structure on the paper substrate (Figure 1D). The fabrication of an all-solid-state device was completed by using PVA/LiCl gel electrolyte. Figure 1E displays cyclic voltammetry (CV) curves of inkjet-printed MSC with 30 printing passes at different scan rates from 5 to 200 mV s−1. The quasi-rectangular shape of CV curves reveals the pseudocapacitive nature of MnO2-based microdevices. The inkjet-printed MSC delivers an areal capacitance of 0.41 mF cm−2 @ 0.02 mA cm-2 and an energy density of 0.057 μWh cm-2. This study provides a simple and efficient inkjet-printing strategy to create high-performance pseudocapacitive MSCs with the potential prospect for the integration in wearable/portable and IoT-based electronics. |
| کلیدواژه ها: |
| Printed electronics, Microsupercapacitor, Inkjet-printing, Manganese dioxide |
| وضعیت : چکیده برای ارائه به صورت پوستر پذیرفته شده است |