ABSTRACT

Micro-supercapacitors (MSCs) with excellent electrochemical behaviours and flexibility possess great promise for portable and wearable electronic devices. A novel type of hybrid-dimensional Fe₂O₃/graphene/Ag ink is developed and extruded into MSC electrodes through the direct ink writing-based three-dimensional (3D) printing. The optimal solid-state MSC device exhibits a maximum areal capacitance of 412.3 mF cm⁻² at 2 mA cm⁻², a correspondingly high energy density of 65.4 μWh cm⁻² and 89% capacitance retention for over 5000 charge and discharge cycles. The superior electrochemical performance is profited by the high electron transport synergistically boosted by two-dimensional graphene nanosheets and one-dimensional Ag nanowires, and the high pseudocapacitive behaviours of Fe₂O₃ nanoparticles. The 3D printed MSC exhibits reliable flexibility with remarkable retention of 90.2% of its original capacitance after 500 bending cycles. The current 3D printing fabrication demonstrates an efficient route for advanced miniaturised electrochemical energy storage.

摘要

具有优异的电化学行为和柔韧性的微型超级电容器（MSC）对于便携式和可穿戴电子设备具有广阔的前景。通过基于直接墨水书写的三维（3D）打印技术，开发了一种新型的混合尺寸Fe ₂ O ₃ /石墨烯/ Ag墨水，并将其挤出到MSC电极中。最佳固态MSC器件在2 mA cm ^-2时具有412.3 mF cm ^-2的最大面积电容，相应的高能量密度为65.4μWhcm ^-2超过5000个充电和放电周期的89％电容保持率。二维石墨烯纳米片和一维Ag纳米线协同促进了高电子传输，以及Fe ₂ O ₃纳米粒子的高拟电容特性，从而获得了优异的电化学性能。3D打印的MSC具有可靠的柔韧性，经过500次弯曲后仍可保持其原始电容的90.2％显着。当前的3D打印制造展示了一种先进的微型化电化学能量存储的有效途径。