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Article Abstract
Microsupercapacitors (MSCs) have emerged as promising miniaturized energy-storage devices for self-powered electronics. However, their practical adoption is hindered by insufficient energy density, poor stability, and short lifespan, necessitating solutions for improved practicability. Herein, we report a novel microwire embedded NiSe/MoSe (NMS) heterostructure MSC that addresses these challenges through photoenhanced energy storage. The device showcases a remarkable performance with a volumetric capacitance of ∼1014 F cm, an energy density of ∼140 mWh cm, and a power density of ∼1.6 W cm. Density functional theory calculations reveal 33-fold higher quantum capacitance and 16-fold lower OH ion adsorption energy compared to pristine monometallic counterparts. Notably, the device powers a red light-emitting diode for 3 min after 1 min of charging, supports a healthcare monitoring device for up to 6 h, and retains ∼100% capacitance over 60000 cycles with 95% Columbic efficiency. Overall, this strategy offers a viable pathway to improve the MSC performance for next-generation microelectronics and biomedical applications.
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