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Highly Concentrated, Ultrathin Nickel Hydroxide Nanosheet Ink for Wearable Energy Storage Devices.
Advanced Materials 2017 October
Solution-based techniques are considered as a promising strategy for scalable fabrication of flexible electronics owing to their low-cost and high processing speed. The key to the success of these techniques is dominated by the ink formulation of active nanomaterials. This work successfully prepares a highly concentrated two dimensional (2D) crystal ink comprised of ultrathin nickel hydroxide (Ni(OH)2 ) nanosheets with an average lateral size of 34 nm. The maximum concentration of Ni(OH)2 nanosheets in water without adding any additives reaches as high as 50 mg mL-1 , which can be printed on arbitrary substrates to form Ni(OH)2 thin films. As a proof-of-concept application, Ni(OH)2 nanosheet ink is coated on commercialized carbon fiber yarns to fabricate wearable energy storage devices. The thus-fabricated hybrid supercapacitors exhibit excellent flexibility with a capacitance retention of 96% after 5000 bending-unbending cycles, and good weavability with a high volumetric capacitance of 36.3 F cm-3 at a current density of 0.4 A cm-3 , and an energy density of 11.3 mWh cm-3 at a power density of 0.3 W cm-3 . As a demonstration of practical application, a red light emitting diode can be lighted up by three hybrid devices connected in series.
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