Preparation of Magnesium Oxide (MgO) thin films by spray pyrolysis and its capacitive characterizations

Abstract

Magnesium oxide (MgO) electrodes for the supercapacitor applications have been prepared using automatic spray pyrolysis technique. 100 ml of 1 M aqueous Mg(NO3)2.6H2O solution was sprayed at 2 ml/min was on to the stainless SS substrate heated to 673 K. The prepared electrodes were analysed structurally by XRD, FESEM, EDX, and contact angle measurement, functional group by FTIR and electrochemically by cyclic voltammetric analyses (CV), electrochemical impedance spectroscopy (EIS) and the galvanostatic charge discharge (GCD) technique. Different peaks in XRD pattern coincide with the standard database of JCPDS 01-1235 indicating the formation of MgO. The formation of crystalline MgO has further been corroborated by EDX. The formation of MgO was studied the molecular interactions between the metal, oxygen and carbon elements though FTIR analysis. Peaks in the CV curves confirm the redox behavior of the MgO during the CV. The measured SC was as high as 202.36 Fg -1 . Superb electrochemical stability is observed at 100 mV/s scan rate. Using charge-discharge. GCD analyses show different behavior from the normal capacitors. The charging and discharging times were found nearly same for different applied currents. The observed maximum SC was 163.55 Fg -1 which is comparable with that obtained by CV.

Influence of Thickness on Some Physical Characterization for Nanostructured MgO Thin Films

“…The results revealed that with the increase of MgO film thickness at (400 and 600 nm); the characteristic peaks of MgO became sharper and more intense [23]. The XRD Parameters of synthesized MgO nanoparticles was determined by Scherrer's equation at different thicknesses (200, 400, and 600 nm) to be (20.79, 19.83, and 18.99 nm) of the MgO nanoparticles respectively [24,25], the crystalline size of a film decreases with increasing thickness. This is because as the thickness of the film increases, the number of grain boundaries in the film increases, which reduces the average grain size [26,27], this is because the surface energy of the particle increases with decreasing size, which causes the lattice parameter to contract.…”

Biochar produced from waste‐based feedstocks: Mechanisms, affecting factors, economy, utilization, challenges, and prospects

“…The products found in the concrete and liquid phases are known as biochar and bio‐oil, respectively, while different synthesis gases can be found in the gaseous phase (Wang & Wang, 2019). Other applications of pyrolysis include biofuel production (Mohamed & Li, 2023), design of recycling processes for waste cable sheath (Meng et al., 2022), production of activated carbon, preparation of vegetable glycerine (AlGemayel et al., 2023), fabrication of thin films of magnesium oxide (MgO) (Mhetre et al., 2022), production of propylene glycol (AlGemayel et al., 2022), liquid petrochemicals (Singh, 2022), and treatment of waste polymers (Pan et al., 2021). Figure 4 presents a flow diagram of the pyrolysis method and its by‐products.…”

Cobalt hydroxide‐based electrodes for supercapacitors: Synthesis, characterization, and electrochemical performance optimization

“…The films behaved in a pseudo‐capacitive, uniform, and porous manner. The automatic spray pyrolysis process was used to create magnesium oxide (MgO) electrodes for supercapacitor applications 21,22 …”

“…The automatic spray pyrolysis process was used to create magnesium oxide (MgO) electrodes for supercapacitor applications. 21,22 Supercapacitors are highly promising electrochemical devices that utilize electrolyte polarization to store energy. They exhibit superior energy densities and longterm rate performance, allowing them to endure approximately 1000 cycles of charging and discharging.…”