Abstract
Copper oxide is considered as an alternative electrode material for supercapacitors due to its low cost, chemical stability and high theoretical specific capacitance. In the present work, nanostructured copper oxide (CuO) films are prepared by radio-frequency (RF) magnetron sputtering, and the influence of the substrate temperature on the microstructure and supercapacitive properties was studied. The copper oxide films prepared at 350 °C exhibit a predominant (1¯11) orientation corresponding to the monoclinic Cu(II)O phase with a crystallite size of 24 nm. The surface of the film consists of uniformly distributed oval-like grains providing a high surface roughness of 45 nm. The films exhibit an optical bandgap of 1.68 ± 0.01 eV and an electrical conductivity of 0.4 S cm−1 at room temperature. The as-prepared CuO films deliver a discharge specific capacitance of 387 mF cm−2 (375 F g−1) at a current density of 1 mA cm−2 with excellent cyclic capacitance retention of 95% (367 mF cm−2) even after 1000 cycles. Hence, these films are potential electrodes for micro-supercapacitors.
Highlights
The spectacular development of the microelectronic industry is day-by-day downscaling its products for a wide range of applications such as medical implants, micro-sensors, self-powered integrated circuits or micro-electro-mechanical systems (MEMS)
The structural properties of the RF sputtered cupric oxide (CuO) films were investigated by XRD
In In this work, we have shown the influence of the substrate temperature on the morthis work, we have shown the influence of the substrate temperature on the morphology of sputtered copper oxide(II)
Summary
The spectacular development of the microelectronic industry is day-by-day downscaling its products for a wide range of applications such as medical implants, micro-sensors, self-powered integrated circuits or micro-electro-mechanical systems (MEMS). Intensive investigations are in progress for the development of two complementary electrochemical energy storage devices, viz., Li-ion microbatteries and micro-supercapacitors. The efficiency of micro-supercapacitors is mainly dependent on suitable electrode materials that facilitate the ion motion between the electrode surface and electrolyte to generate high capacitance and store energy through faradaic redox reactions. Due to their high oxidation states, transition metal oxides (TMOs) demonstrate efficient redox charge storage, meaning that they could satisfy the needs of high energy density and power density [8,9].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
