Department of Physics, Sharif University of Technology, P.O. Box 11155-9161Tehran, I.R. of Iran.
ACS Appl Mater Interfaces. 2023 Jan 25;15(3):3894-3903. doi: 10.1021/acsami.2c08939. Epub 2023 Jan 13.
Printing technologies are gaining growing attention as a sustainable route for the fabrication of high-performance and flexible power sources such as microsupercapacitors (MSCs). Here, the inkjet printing method is utilized for the fabrication of manganese dioxide (MnO)-based, flexible all-solid-state MSCs on surface-modified A4 paper substrate. The appropriate rheology of the formulated ethanol-based ink (Fromm number <10) and the proper dimensions of MnO nanoflowers (average size ∼600 nm) ensure a reliable inkjet printing process. Moreover, the underlying graphene/Ag nanowire pattern serves as a primer and highly conductive ( < 2 Ω sq) layer on top of the paper to facilitate the anchoring of MnO nanoflowers and rapid electron transportation. The resulting all-solid-state MSCs deliver a maximum areal capacitance of 0.68 mF cm at a current density of 25 μA cm, reasonable durability (>80% of capacity remained after 3000 cycles), and remarkable foldability. Additionally, the inkjet-printed MSC devices deliver a superior areal energy density of 0.01 μWh cm and also a power density of 1.19 μW cm. This study demonstrates the power of the inkjet printing method to produce MSCs on flexible substrates, which have great potential for flexible/wearable electronics.
打印技术作为一种可持续的方法，越来越受到关注，可用于制造高性能和柔性电源，例如微超级电容器（MSCs）。在这里，喷墨打印方法被用于在表面改性的 A4 纸基底上制造基于二氧化锰（MnO）的、柔性全固态 MSC。所制定的基于乙醇的墨水的适当流变学（Fromm 数<10）和 MnO 纳米花的适当尺寸（平均尺寸∼600nm）确保了可靠的喷墨打印过程。此外，底层的石墨烯/Ag 纳米线图案作为底漆和高度导电的（<2Ωsq）层位于纸张之上，以促进 MnO 纳米花的固定和快速电子传输。所得的全固态 MSCs 在 25μA cm 的电流密度下提供了最大的面电容为 0.68 mF cm，具有合理的耐用性（>3000 次循环后容量保持 80%以上）和出色的可折叠性。此外，喷墨打印 MSC 器件具有较高的面能量密度为 0.01μWh cm，以及功率密度为 1.19μW cm。本研究展示了喷墨打印方法在柔性基底上制造 MSCs 的能力，这对于柔性/可穿戴电子设备具有巨大的潜力。
