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首页> 外文期刊>Advanced Functional Materials >Scalable Production of Graphene Inks via Wet-Jet Milling Exfoliation for Screen-Printed Micro-Supercapacitors
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Scalable Production of Graphene Inks via Wet-Jet Milling Exfoliation for Screen-Printed Micro-Supercapacitors

机译：通过湿式喷射研磨剥落法可大规模生产石墨烯油墨，用于丝网印刷的微型超级电容器

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摘要

The miniaturization of energy storage units is pivotal for the development of next-generation portable electronic devices. Micro-supercapacitors (MSCs) hold great potential to work as on-chip micro-power sources and energy storage units complementing batteries and energy harvester systems. Scalable production of supercapacitor materials with cost- effective and high-throughput processing methods is crucial for the widespread application of MSCs. Here, wet-jet milling exfoliation of graphite is reported to scale up the production of graphene as a supercapacitor material. The formulation of aqueous/alcohol-based graphene inks allows metal-free, flexible MSCs to be screen-printed. These MSCs exhibit areal capacitance (C-areal) values up to 1.324 mF cm(-2) (5.296 mF cm(-2) for a single electrode), corresponding to an outstanding volumetric capacitance (C-vol) of 0.490 F cm(-3) (1.961 F cm(-3) for a single electrode). The screen-printed MSCs can operate up to a power density above 20 mW cm(-2) at an energy density of 0.064 mu Wh cm(-2). The devices exhibit excellent cycling stability over charge-discharge cycling (10 000 cycles), bending cycling (100 cycles at a bending radius of 1 cm) and folding (up to angles of 180 degrees). Moreover, ethylene vinyl acetate-encapsulated MSCs retain their electrochemical properties after a home-laundry cycle, providing waterproof and washable properties for prospective application in wearable electronics.
机译：储能单元的小型化对于下一代便携式电子设备的发展至关重要。微型超级电容器（MSC）具有巨大的潜力，可以作为片上微型电源和能量存储单元来补充电池和能量收集器系统。用具有成本效益和高通量的加工方法大规模生产超级电容器材料对于MSC的广泛应用至关重要。在此，据报道，石墨的湿式喷射研磨剥落可扩大作为超级电容器材料的石墨烯的生产。水性/醇基石墨烯油墨的配方允许丝网印刷不含金属的柔性MSC。这些MSC的面电容（C面积）值高达1.324 mF cm（-2）（单个电极为5.296 mF cm（-2）），对应于0.490 F cm（ -3）（单个电极为1.961 F cm（-3）。丝网印刷的MSC可以在能量密度为0.064μWh·cm（-2）的情况下以高达20 mW cm（-2）的功率密度工作。该器件在充放电循环（10000次循环），弯曲循环（在1 cm弯曲半径下为100个循环）和折叠（最大180度角）方面均具有出色的循环稳定性。此外，乙烯-醋酸乙烯酯包裹的MSC在家庭洗衣循环后仍保持其电化学性能，为可穿戴电子产品的预期应用提供了防水和可洗的性能。

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