Two-dimensional Ni(OH)₂ nanoplates for flexible on-chip microsupercapacitors

On-chip microsupercapacitors (MSCs) compatible with on-chip geometries of integrated circuits can be used either as a separate power supply in microelectronic devices or as an energy storage or energy receptor accessory unit. In this work, we report the fabrication of flexible two-dimensional Ni(OH)₂ nanoplates-based MSCs, which achieved a specific capacitance of 8.80 F/cm³ at the scan rates of 100 mV/s, losing only 0.20% of its original value after 10,000 charge/discharge cycles. Besides, the MSCs reached an energy density of 0.59 mWh/cm³ and a power density up to 1.80 W/cm³, which is comparable to traditional carbon-based devices. The flexible MSCs exhibited good electrochemical stability when subjected to bending at various conditions, illustrating the promising application as electrodes for wearable energy storage. [Figure not available: see fulltext.]