Tailored Core-Shell Nanostructure Achieved through Atomic Layer Deposition for Superior Energy Storage Performance Application

A distinctive method was employed to construct ultrathin NiO on phosphorous-doped MnO 2 nanosheets, utilizing a straightforward hydrothermal process to form a Mn precursor on Ni-foam followed by phosphorous doping through a simple solid-state annealing process and ALD technique. The impact of phosphorous doping was examined by varying the annealing temperature, resulting in a significant increase in oxygen vacancies and electrochemical performance. Additionally, the atomic layer deposition of NiO not only improved electrochemical performance but also ensured cycling stability without impeding the system. By adjusting the thickness of the NiO thin films over phosphorous-doped MnO 2 , a notable enhancement in electrochemical performance was achieved, as evidenced by the performance of the solid-state asymmetric device. This hybrid approach is expected to pave the way for novel electrode material designs for high-performance supercapacitors, leveraging electroactive metal oxides through ALD coating.