12/25/2023 0 Comments Cuo oxygen chargeNevertheless, it will be useful to prepare cost-effective, multi-functional electrode materials with reasonably good performance capabilities in order to further develop advanced supercapacitors and DMFCs.Īmong various factors, a relatively high-cost, complex-fabrication and the low-activity of electrode materials are the main obstacles for using supercapacitors and DMFCs in large-scale applications 6, 7. Direct methanol fuel cells (DMFCs) have also attracted a considerable amount of interest due to the abundance of their raw materials, high power density, fast recharge, and low operating temperatures 2, 6. Recently, there has been an increased interest in supercapacitors because they possess a higher energy density and power density than batteries, fast charging/discharging rates, and a long cycle life 3, 4, 5. The rapid depletion of fossil fuels and the ever-increasing concern over environmental pollution has motivated intensive research and development of novel materials to improve the performance of advanced energy devices 1, 2. The results show that the Cu 2O and CuO electrodes are electro-catalytically active and highly stable. Cyclic voltammetry and chronoamperometry are used to study the electrochemical energy conversion properties of the films via methanol electro-oxidation. The electrochemical analysis reveals that the Cu 2O and CuO electrodes have high specific capacitances of 215 and 272 F/g in 6 M KOH solution with a capacity retention of about 80% and 85% after 3000 cycles, respectively. The electrochemical energy storage properties of the films are investigated by carrying out cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy tests. X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscope studies reveal that granular, single-phase Cu 2O and CuO can be obtained by controlling the oxygen flow rate. The obtained films are characterized in terms of their structural, morphological, and compositional properties. This work reports on the concurrent electrochemical energy storage and conversion characteristics of granular copper oxide electrode films prepared using reactive radio-frequency magnetron sputtering at room temperature under different oxygen environments.
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