Materials Science for Energy Technologies最新文献

The enhancement of photocatalytic reactivity through the internal electric field has received much attention. The combination of the piezoelectric effect and the photo-exiting process facilitates the segregation of the photogenerated carriers, thereby boosting the piezo-photocatalytic activity. We have constructed g-C₃N₄/Ag/ZnO tri-component composites; with various g-C₃N₄ precursors to achieve reliable photo/piezo-photocatalysis for H₂ production and Rhodamine B (RhB) dye degradation. We observed that urea-based g-C₃N₄/Ag/ZnO (UCAZ) tri-components exhibit a superior H₂ production rate of 1125.5 μmol h⁻¹ g⁻¹ under photocatalytic conditions. When piezoelectric-potential was introduced into the photocatalysis reaction via ultrasonic, the H₂ rate increased dramatically to 1637.5 μmol h⁻¹ g⁻¹, which is approximately 145% greater than that light irradiation alone.

Similarly, the catalytic decomposition ratio of Rhodamine B (RhB) under the coexistence of ultrasound and light, and degradation efficiency reached 99% in 120 min, which is higher than the value of (42%, 0.0031 min⁻¹) for piezo-catalysis and (80%, 0.01 min⁻¹) for photocatalysis condition alone. The rate constant under synergistic simulation reaches 0.021 min⁻¹, which is 200% and 645% times higher than the sole light and ultrasonic illumination. Additionally, RhB degradation of all the tri-components was performed under solar light (Sunlight) and ultrasound irradiation, and efficiency reached 99.5% in 45 min with a rate constant of 0.06 min⁻¹, which is 300% higher than the piezo-photocatalytic under LED source. The enhanced performance of the g-C₃N₄/Ag/ZnO tricomponent is attributed to the high specific surface area (168 m² g⁻¹) and synergetic effect of piezo catalysis and photocatalysis.

In the present study, a binary biofuel blend was prepared by blending soy methyl ester (SME100) and methyl oleate (MO) SME50-M50 with diesel. The physiochemical properties of blended fuels were also investigated. The performance and emissions characteristics of all fuel blends were estimated using a common-rail direct injection (CRDI) engine. The outcomes demonstrate a reduction in brake-specific fuel consumption (BSFC) when enriched biodiesel is used in comparison to SME100, nonetheless by the virtue of viscosity and heating value there is an increase in the BSFC value when compared to diesel. The average BSFC values were obtained as 5.3% (E25), 10.6% (E50), 17.5% (E75), 30% (SME100) and 14.9% (SME50-M50) higher than that of diesel. BTE was found to be highest for E25 and lowest for SME100 among all the blends. NOx emissions with blended biodiesel were slightly higher than diesel on account of MO being unsaturated, resulting in shorter ignition delay. The average NOx values obtained were higher than that of diesel and the corresponding values are 2.91% (E25), 4.1% (E50), 5.8% (E75), 8.3% (SME100) and 15.8% (SME50-M50). As a result of the increased oxygen content of the fuel, the concentrations of UHC and CO depreciated with the rise in concentration of soy methyl ester and MO (SME50-M50). Currently, Euro 6.2, which is the most recent emission regulation, uses 10% biofuel (B10); however, the results of this study establishes that E25, as an alternate fuel, complies with the contemporary engines without requiring any engine modifications.

Research has been carried out on indicator electrodes (1) PVA-Enzyme/PVC-KTpClPB, sensitivity 19,069 mV/decade, detection range 1.10⁻⁵–5.10⁻⁴ M, detection limit 1.10–5 M. The width of the peak UV–vis absorbance is narrow (2) PVA-Enzyme/GA-2.9 %/PVC-KTpClPB wide UV–vis absorbance peak but the absorbance peak decreased, (3) PVA-Enzyme/GA-2.9 %/PVC-KTpClPB-o-NPOE XRD analysis amorphous spectral pattern appeared (4) PVA-Enzyme/GA-2.9 %/PPy + H₂SO₄/PVC-KTpClPB-o-NPOE (5) PVA-Enzyme/GA-2.9 %/PPy + Sulfonic Acid/PVC-KTpClPB-o-NPOE, amorphous spectrum pattern in (4) and (5) were greatly reduced for the enzyme variation of 0.6 g in 0.5 mL (50 % water + 50 % alcohol). GA plays a role in increasing the detection range, o-NPOE forms amorphous, enzyme variations increase the intensity of the XRD spectrum pattern. The method of developing a gradual modification of the indicator electrode membrane by cross-linking GA, o-NPOE, conductive polymer. The best results were obtained at the indicator electrode PVA-Enzyme/GA-2.9 %/PPy + Sulfonic Acid/PVC-KTpClPB-o-NPOE. Analysis of the linear curve of the sample EI₅-1 with a sensitivity of 41.56 mV/decade, a detection range of 10⁻⁴–10⁻¹ M and a detection limit of 10⁻⁴ M, R² = 97.51 %. The best indicator electrode is EI₅-1.

Quantum dots play an important role in third-generation photovoltaics. The key focus on quantum dots is due to their cost effect, capacity to work in diffused light, ease of fabrication, light weight, and flexibility which pique curiosity to further research. The incorporation of quantum dots into photovoltaics results in theoretically high thermodynamic conversion efficiencies of up to 40%, but in practise, the efficiencies are lower than those of dye-sensitized solar cells. Recent developments of different components like photoanode, quantum dot sensitizer, electrolyte, and counter electrode were discussed in detail. It was observed that by changing the synthesis methods, the adhesion properties might vary, which leads to enhancing the photovoltaic properties such as power conversion efficiency (PCE), open circuit voltage (Voc), short circuit current (Jsc), and fill factor (FF). The first report on the efficiency of Quantum Dot Sensitized Solar Cells (QDSSCs) was 0.12%. As of today, the efficiency is reported as 18.1 %, and further, the researchers are working to improve the efficiency of QDSSCs.

Optimizing electrocatalytic activity and recognizing the most reactive sites for oxygen evolution reaction (OER) electrocatalysts are valuable to the order of renewable power. In this research article, we explored an innovative in-situ annealing technique for constructing iron carbide nanoparticles (Fe₃C NPs) encapsulated via nitrogen and phosphorous doped bamboo-shape carbon nanotubes (NP-CNTs) for OER. Interestingly, the constructed Fe₃C NPs@NP-CNT-800 composite exhibited remarkable electrochemical operation and offered a stable current density of 10 mA/cm² at a lower overpotential (280 mV) in an alkaline solution. Furthermore, an innovative Fe₃C NPs@N,P-CNT-800 hybrid surpassed the standard RuO₂ electrocatalyst in terms of OER performance and showed negligible degradation in chronoamperometric (21 h) and chronopotentiometry (3000 cycles) analyses. The remarkable performance and stability are ascribed to the Fe₃C NPs, novel tubular bamboo-like morphology of its carbon materials, and heteroatom doping, which contribute to the electrochemical interfaces, large surface area, active catalytic sites, and rapid charge transfer kinetics.

Sodium-ion batteries (SIBs) are gaining increasing attention as a promising alternative to lithium-ion batteries (LIBs) for grid-scale energy storage applications. This is due to the abundance and low cost of sodium resources. Among the key components of SIBs, cathode materials play a critical role in determining performance and overall cost. Phosphate framework materials have become an attractive option for electrode materials in SIBs due to their high structural stability, facile reaction mechanism, and rich structural diversity. In this review, we discuss recent advances in the exploration of phosphate framework materials, including fluorophosphates, pyrophosphates, and carbonphosphates. Additionally, we highlight the relationship between the materials' structure, composition, and performance. Furthermore, we examine Morocco's potential to leverage its rich phosphate resources for the development of a sustainable and economically viable energy storage industry. As one of the world's largest producers and exporters of phosphate, the research and development of sodium ion phosphate batteries in Morocco has the potential to promote the growth of the renewable energy sector and reduce dependence on fossil fuels.