CuO@ZnO Nanocomposites with Improved Redox Behavior for High-Performance Supercapacitors
- 1School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
- 2Department of Energy Material Science, Konkuk University, Chungju 27478, Republic of Korea
Abstract
In this work, we employed an easy hydrothermal method to prepare CuO and ZnO, as well as the prepared composite nanostructured electrodes of CuO@ZnO for supercapacitor applications. The systematic electrochemical performance evaluation of the prepared materials was conducted by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). CuO@ZnO nanocomposite reflected the best charge storing behavior with a specific capacitance of 513 F/g, followed by pristine CuO (190 F/g) and ZnO (416 F/g). The composite also demonstrated 25.67 Wh/kg and 400 W/kg for energy density and power density, respectively, suggesting improved electrochemical performance. Besides, the areal and volumetric capacitances were 0.77 F/cm2 and 4.81 F/cm3, respectively, supported by the structural integrity and enhancement in electroactive materials utilization of the electrode material. Kinetic analysis showed that b values of the samples had mixed capacitive/diffusion-controlled charge storage, while higher diffusion coefficients and standard rate constants were apparent for ion transport or redox kinetics. EIS results showed a 2.14 Ω solution resistance, indicative of a decreased electrical resistivity. An asymmetric supercapacitor device fabricated by CuO@ZnO as the positive electrode and activated carbon (AC) as the negative electrode provided the specific capacitance of 48.57 F/g, energy density of 15.17 Wh/kg, and power density of 535 W/kg. After 10,000 cycles, the capacitance of the device was 76%, indicating good long-term stability.
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BibTeX
@article{yewale2026cuozno,
title = {{CuO@ZnO Nanocomposites with Improved Redox Behavior for High-Performance Supercapacitors}},
author = {Manesh A. Yewale and Santosh V. Mohite and S. Otmani and Annu and D. K Shin},
journal = {Materials},
year = {2026},
month = jun,
doi = {10.3390/ma19122460},
url = {https://doi.org/10.3390/ma19122460},
note = {CC BY},
}
RIS
TY - JOUR
TI - CuO@ZnO Nanocomposites with Improved Redox Behavior for High-Performance Supercapacitors
AU - Manesh A. Yewale
AU - Santosh V. Mohite
AU - S. Otmani
AU - Annu
AU - D. K Shin
PY - 2026
DA - 2026/06/09
JO - Materials
DO - 10.3390/ma19122460
UR - https://doi.org/10.3390/ma19122460
AB - In this work, we employed an easy hydrothermal method to prepare CuO and ZnO, as well as the prepared composite nanostructured electrodes of CuO@ZnO for supercapacitor applications. The systematic electrochemical performance evaluation of the prepared materials was conducted by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). CuO@ZnO nanocomposite reflected the best charge storing behavior with a specific capacitance of 513 F/g, followed by pristine CuO (190 F/g) and ZnO (416 F/g). The composite also demonstrated 25.67 Wh/kg and 400 W/kg for energy density and power density, respectively, suggesting improved electrochemical performance. Besides, the areal and volumetric capacitances were 0.77 F/cm2 and 4.81 F/cm3, respectively, supported by the structural integrity and enhancement in electroactive materials utilization of the electrode material. Kinetic analysis showed that b values of the samples had mixed capacitive/diffusion-controlled charge storage, while higher diffusion coefficients and standard rate constants were apparent for ion transport or redox kinetics. EIS results showed a 2.14 Ω solution resistance, indicative of a decreased electrical resistivity. An asymmetric supercapacitor device fabricated by CuO@ZnO as the positive electrode and activated carbon (AC) as the negative electrode provided the specific capacitance of 48.57 F/g, energy density of 15.17 Wh/kg, and power density of 535 W/kg. After 10,000 cycles, the capacitance of the device was 76%, indicating good long-term stability.
SN - 1996-1944
ER -