Electrochemical synthesis of iron-based superconductor FeSe films

The superconducting FeSe films were successfully fabricated using the electrochemical synthesis. The composition ratio of Fe and Se can be controlled by the electric potential and pH value. We found that the FeSe films deposited at the electric potential -1.75 V and pH 2.3 show the superconducting transition at 3.5 K. The establishment of this electrochemical synthesis technique will provide many advantages for application.Comment: 15 pages, 6 figure

Synthesis and characterization of CuO@NiO/g-C3N4 nanocomposite for photocatalytic and electrochemical application

In this work, pristine g-C3N4 and CuO@NiO/g-C3N4 nancomposite (NC’s) were created and examined for their application in dye degradation and as supercapacitors. The physical, chemical and optical properties of the synthesized material were determined using XRD, HR-SEM, EDX, TEM, XPS, Raman, UV-DRS, PL and BET studies. The CuO@NiO/g-C3N4 NC’s had higher photocatalytic degradation efficiency (98.38 %) at pH 10 ± 0.1 with velocity constant, k = 0.074 min−1 than pure g-C3N4 (75.1 %; k = 0.023 min−1) against rhodamine-B (RhB). The CuO@NiO/g-C3N4 NC’s shows a higher capacitance value of 170.17 F/g than pure g-C3N4 (135.04 Fg−1) at 0.1 A/g in 2 M KOH. The CuO@NiO/g-C3N4 NC’s show 90 % electrochemical property retention even after 2000 GCD cycles, which is one of the primary advantages of long-term applications. The conductivity of the CuO@NiO/g-C3N4 NC’s shows σ = 3.72 × 10−3 S/cm determined by EIS analysis. Due to the CuO@NiO/g-C3N4 nanohybrid outstanding performance in both photocatalysis and electrocatalysis, it has become known as a promising, long-lasting catalyst

Photocatalytic degradation efficiency of Rhodamine-B for CuO/CdO nanosheets attained through simple co-precipitation method

In the present investigation, the growth of CuO/CdO nanosheets by simple coprecipitation method and characterized by XRD, SEM with EDX, TEM, UV–visible and PL. The incorporation of the non-ionic surfactant Triton X-100 blend with CuO/CdO resulted in hexagonal shaped grains with a nanoporous structure. The pristine CuO and CdO display monoclinic and cubic phases, respectively, whereas the CuO/CdO exhibits a combination of two phases, as proven by XRD analysis. According to TEM analysis the CuO/CdO composite particle size was reduced in the range between 20 and 50 nm resulting, the bandgap value is decreased around 1.26 eV due to size effect. The photocatalytic activity against Rhodamine-B (RhB) showed a 94 % degradation efficiency as compared to pristine CuO (71.42 %) and CdO (77.83 %). Furthermore, the CuO/CdO nanocomposite catalyst dosage increasing the degradation efficiency was found to be 97.62 %. Although the nitration process is more efficient at pH 6, the degradation efficiency for CuO, CdO, and CuO/CdO was found to be 75.74, 85.96 %, and 99.88 % at pH 6. In acidic solution, the reusability of CuO/CdO was outstanding with a 95.80 % degradation efficiency after five successive cycles

Structure, morphology, composition, optical properties of CuO/NiO nanocomposite for electrochemical energy storage devices

A CuO/NiO nanocomposite synthesized using a simple co-precipitation process was employed to produce a high-performance electrochemical supercapacitor. The crystal nature, particle, composition, chemical state, and optical properties were investigated using powder XRD, TEM, EDX, FTIR, XPS, and UV–visible spectroscopy respectively. The electrochemical properties of CV, GCD and EIS are measured in 1 M NaOH. At a 0.5 Ag−1 current density, the CuO/NiO composites exhibit greater capacitance (290.56 Fg-1) when compared to the individual compounds of CuO (165.20 Fg−1) and NiO (190.34 Fg−1). After 2000 cycles the CuO/NiO electrode was excellent 90% of capacity retention. The Ragone plot discovers better energy density of 4.24Wh kg−1 and power density of 10.67 kW kg−1 were provided by the CuO/NiO nanocomposites. The maximal ionic conductivity for the CuO/NiO nanocomposite is 3.56 10-4 S/cm based on the Cole-Cole plot. Furthermore, galvanostatic charge–discharge (GCD), peak current, dielectric properties of dielectric constant and electric modulus are discussed in this work. These results have indicated that the CuO/NiO nanocomposite is an excellent material for supercapacitor electrode construction

Influence of solution pH dependency on structure, optical with photoelectrochemical characteristics of SILAR deposited copper oxide thin films

Photoelectrochemical (PEC) technology is a promising approach for converting solar energy into chemical energy, offering significant potential for renewable energy applications. In this work, the CuO thin film was fabricated with different pH value in between 8.5 ± 0.1 and 10.5 ± 0.1 via Successive Ionic Layer Adsorption and Reaction (SILAR) method. The Effect of pH on thickness, structural, morphological, elemental composition and optical properties were investigated by using stylus profilometry, XRD, SEM, TEM, EDX, UV–vis and PL. The XRD results showed that as the pH increased, the crystallite size increased from 19.24 nm to 25.62 nm, with a monoclinic phase along the (111) direction. The CuO film deposited at pH value 10.5 ± 0.1 exhibit well defined identical particle with its size in the range between 200 and 300 nm was confirmed by SEM and TEM analysis. As the pH increased from 8.5 ± 0.1 to 10.5 ± 0.1, the CuO film bandgap (Eg) value reduced from 1.52 eV to 1.42 eV with indirect transition. The CuO photocathode deposited at pH 10.5 ± 0.1 shows maximum photocurrent density of 1.45 mA/cm2 at −0.1 V vs. RHE in 0.5 M Na2SO4 solution. Furthermore, the Electrochemical Impedance Spectroscopy (EIS) analysis shows, the CuO (pH 10.5 ± 0.1) electrode have higher conductivity value of 0.6862 S/cm compared CuO at pH 8.5 ± 0.1 (0.2779 S/cm) and CuO at pH 9.5 ± 0.1 (0.4646 S/cm) electrodes

Effect of substrate on electroplated copper sulphide thin films

Copper Sulphide thin films have been prepared on different substrates using electrodeposition technique. X-ray diffraction analysis showed that the prepared films possess polycrystalline in nature with cubic structure. Microstructural parameters such as crystallite size, strain and dislocation density are determined using X-ray diffraction data. Film composition and surface morphology have been analyzed using Scanning electron microscopy and Energy dispersive analysis by X-rays. Optical absorption analysis showed that the prepared films possess band gap value in the range between 2.2 and 2.4 eV for films obtained on different substrates