Materials for Renewable and Sustainable Energy最新文献

{"title":"High-performance parameter extraction for solid oxide fuel cells under dynamic conditions using the griffon vulture optimization algorithm","authors":"Manish Kumar Singla,&nbsp;Ramesh Kumar,&nbsp;Pradeep Jangir,&nbsp; Arpita,&nbsp;Gagandeep Berar","doi":"10.1007/s40243-026-00384-4","DOIUrl":"10.1007/s40243-026-00384-4","url":null,"abstract":"<div><p>Solid oxide fuel cells (SOFCs) offer high energy conversion efficiency alongside excellent fuel flexibility. However, their complex underlying electrochemical processes require successful parameter identification so that modeling and control can be achieved. Traditional optimization algorithms on the other hand often face limitations in this problem, such as premature convergence to suboptimal solutions, or an inability to explore the entire solution space. In this manuscript a new metaheuristic based on vulture foraging is derived i.e., Griffon Vulture Optimization Algorithm (GVOA). It is superior in terms of accuracy, stability and computational speed in case of complicated optimization, such as SOFC parameter identification. GVOA’s guided convergence and controlled diversity provide a theoretically sound and practical solution. Because of its efficiency, it can be used for real-time modeling and adaptive control. The GVOA algorithm was successfully used to estimate seven nonlinear model parameters of a simplified SOFC model in ten different operating conditions (varying temperature and pressure), based on simulated V-I data. In comparison with 9 well-known metaheuristic algorithms, such as BKA, AO, LSO, and PEOA, GVOA always gave the lowest minimum mean squared error (MSE) results under any temperature and pressure conditions. Furthermore, it occupied the highest rank in the Friedman test in all situations and had the quickest convergence behaviour. These results validate GVOA’s superior accuracy, stability and speed with respect to the challenging task of identification of SOFC parameters. Theoretically, this is evidence in support of the efficacy of its combination of guided convergence and controlled diversity, and, practically, is a reliable method for modeling and adaptive control of fuel cell systems. Upcoming research will be spread to investigational validation and application to other electrochemical systems.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00384-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vacancy-ordered A2RuBr6 double perovskites as dual-functional visible-light photocatalysts and half-metallic spintronic materials","authors":"Mohamed El Amine El Goutni,&nbsp;Danish Abdullah,&nbsp;Mohammed Batouche,&nbsp;Hela Ferjani,&nbsp;Taieb Seddik,&nbsp;Aarif Ul Islam Shah,&nbsp;Edson L. Meyer","doi":"10.1007/s40243-026-00385-3","DOIUrl":"10.1007/s40243-026-00385-3","url":null,"abstract":"<div><p>This study explores the vacancy-ordered double perovskites A₂RuBr₆ (A = Cs, Rb, K) as novel photocatalysts and spintronic materials, addressing the global climate crisis through sustainable oxidation processes. Employing density functional theory (DFT) with the Wu-Cohen Generalized Gradient Approximation (GGA-WC), Tran-Blaha modified Becke-Johnson (TB-mBJ) potential, and spin-orbit coupling (SOC) within the WIEN2k package, we investigate their structural, electronic, optical, and mechanical properties. Structural analyses reveal a stable cubic Fm-3 m lattice with lattice constants of 10.23–10.58 Å, bulk moduli of 32.06–37.46 GPa, and negative formation energies (–2.61 to − 3.57 eV), confirming thermodynamic and mechanical stability. Electronic properties exhibit direct band gaps of 1.50–1.68 eV (λ ≈ 738–826 nm), enabling efficient absorption deep into the visible-red region and covering ~ 30–35% of the solar spectrum, significantly higher than TiO₂ (Eg ≈ 3.2 eV, λ ≈ 388 nm, ~ 5%) and CdS (Eg ≈ 2.4 eV, λ ≈ 517 nm, ~ 17%). Half-metallic ferromagnetic behavior driven by Ru 4d electrons enhances spin-polarized transport. Optical characteristics include high absorption coefficients (4.25–7.34 × 10⁵ cm⁻¹), low reflectivity (10–14%), and excitonic binding energies of 139–167 meV, promoting efficient charge separation. Band edge positions (EVB: 1.69–1.75 eV; ECB: 0.01–0.25 eV) favor water oxidation, surpassing TiO₂, CdS, and WO₃ in visible-light responsiveness and spin selectivity, though reduction is limited by positive ECB. Mechanical ductility (B/G &gt; 1.88) supports durability. Future research on stability enhancements and experimental validation is essential to realize A₂RuBr₆’s potential in sustainable energy applications.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00385-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Non-stoichiometric Mg-Ni composites for hydrogen storage: role of in-situ Mg2Ni formation in enhancing hydrogen sorption performance","authors":"Babak O’. Shahreza,&nbsp;Julia Ivanisenko,&nbsp;Fjodor Sergejev,&nbsp;Hosseinali Omranpour,&nbsp;Jacques Huot","doi":"10.1007/s40243-026-00378-2","DOIUrl":"10.1007/s40243-026-00378-2","url":null,"abstract":"<div><p>Magnesium-based alloys are promising hydrogen storage materials due to their high capacity but suffer from slow hydrogenation kinetics and high operating temperatures. While high-pressure torsion (HPT) enhances kinetics through microstructural refinement, and nickel addition provides catalytic effects, their combined influence on hydrogen storage performance remains insufficiently characterized. This work investigates Mg-Ni composites with variable Ni content (2–16 at%). After consolidating the powders by HPT and activating them in a Sievert apparatus, in-situ differential scanning calorimetry (DSC) was used to track phase evolution and extract thermodynamic parameters. DSC thermal cycling under hydrogen promoted the in-situ solid-state synthesis of Mg₂Ni from the elemental mixtures. Activation energy analysis revealed systematic reduction with increasing Ni content. While HPT enhanced initial hydrogenation kinetics, thermodynamic parameters (enthalpy, entropy) showed no systematic variation across HPT conditions, as high thermal cycling temperatures (up to 450 °C) led to the annealing of HPT-induced structural defects. The findings demonstrate that compositional tuning through in-situ Mg₂Ni formation dominates hydrogen storage performance, with HPT serving primarily as an initial activation aid.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00378-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148987041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unlocking the potential of the magnesium-based electrode materials for supercapacitive energy storage","authors":"Parisa Salarizadeh,&nbsp;Mohammad Bagher Askari","doi":"10.1007/s40243-026-00383-5","DOIUrl":"10.1007/s40243-026-00383-5","url":null,"abstract":"<div><p>This review provides a critical and forward-looking analysis of recent advancements in magnesium-based electrode materials for supercapacitors, a class of materials distinguished by their unique combination of high theoretical capacity, divalent charge carrier (Mg²⁺), and sustainability profile. Moving beyond a simple summary, the work systematically deconstructs the electrochemical performance and charge storage mechanisms of key material families, including oxides (e.g., MgCo₂O₄, MgO), hydroxides, sulfides, and hybrid composites by linking specific structural modifications (nanostructuring, doping, composite formation) to their resultant impact on conductivity, stability, and capacitance. A central and unique contribution of this review is its structured critical evaluation, which clearly delineates the persistent challenges of poor intrinsic conductivity and ion diffusion kinetics, and their direct consequences on device-level performance. Furthermore, the review merges current literature into actionable, strategic research pathways. It prioritizes advanced material engineering, such as the design of conductive 3D heterostructures and defect-controlled doping, to chart a clear course for overcoming existing limitations. Ultimately, this work positions magnesium-based electrodes not merely as alternatives but as a viable and sustainable platform for next-generation energy storage, provided these focused research directions are pursued.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00383-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148987118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intermediate-temperature molten sodium batteries based on NaI–AlCl3 catholytes and NASICON solid electrolytes","authors":"Benedetta Brancato,&nbsp;Leone Frusteri,&nbsp;Ivan Mastronardo,&nbsp;Claudia D’Urso","doi":"10.1007/s40243-026-00381-7","DOIUrl":"10.1007/s40243-026-00381-7","url":null,"abstract":"<div><p>The rapid expansion of renewable energy technologies requires the development of efficient and reliable stationary energy storage systems. Among emerging alternatives to lithium-ion batteries, molten sodium batteries represent a promising solution due to the abundance of sodium resources, intrinsic safety, and favorable electrochemical characteristics. However, conventional sodium–sulfur and sodium–metal halide batteries operate at elevated temperatures (typically above 270 °C), which increases system complexity, materials degradation, and thermal management requirements. In this work, we investigate the use of NaI–AlCl₃ eutectic mixtures as redox-active catholytes for molten sodium batteries operating at intermediate temperatures. A composition of 60:40 mol % NaI–AlCl₃ was synthesized and integrated into planar laboratory cells employing NASICON solid electrolytes. The electrochemical behavior of the system was evaluated at 150 °C using cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge–discharge testing. The selected eutectic composition exhibited stable molten behavior and reversible electrochemical activity associated with the iodide/triiodide redox couple. Initial impedance measurements revealed a progressive decrease in interfacial resistance during the first hours of operation, attributed to improved wetting of the catholyte within the carbon felt current collector. Galvanostatic cycling performed at a current density of 1.4 mA cm showed stable voltage profiles with an average cell voltage of approximately 3.24 V. The cell maintained an energy efficiency above 95% over 50 cycles, corresponding to more than 1200 h of operation, with negligible voltage drift. These results demonstrate that NaI–AlCl⁻²₃ molten catholytes enable stable sodium battery operation at significantly reduced temperatures compared to conventional molten salt systems. The combination of halide-based eutectic catholytes and NASICON solid electrolytes represents a promising pathway toward safer and more cost-effective stationary energy storage technologies.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00381-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A nanogenerator review of current trends, advancement and future directions","authors":"Arguine Tes Raj,&nbsp;Binola K Jebalin I. V.,&nbsp;Ancy Michel,&nbsp;Angelin Delighta .A,&nbsp;Maria E. Messing,&nbsp;D. Nirmal","doi":"10.1007/s40243-026-00379-1","DOIUrl":"10.1007/s40243-026-00379-1","url":null,"abstract":"<div><p>Nanogenerators are significant in the era of the emerging biodegradable energy harvesting systems, Internet of Things (IoT) application and wearable gadgets, where battery replacement and external power supply are challenging. The rise in energy demand coupled with concerns regarding environmental contamination caused by fossil fuel-based energy generation has spurred research and development of novel sustainable methods for energy harvesting. Nanogenerators increase the operational life of IoT devices by providing sustainable power source. Various nanogenerators like the piezoelectric nanogenerator, triboelectric nanogenerator, thermoelectric nanogenerator, pyroelectric nanogenerator and hybrid nanogenerator are used for sophisticated detection of systems in various fields that are small, inexpensive and environmentally benign. Generally, the choice of a nanogenerator depends on its intended application and the environment in which it will operate. Due to high output and different applications in different conditions and frequency ranges, triboelectric nanogenerators are extensively investigated. Piezoelectric nanogenerators have properties that are well-suited for wearable electronics and environmental sensing. Various studies have reported nanogenerators with high open-circuit voltages of 18 kV, 10 kV, 753 V and 578 V. and short-circuit currents of 348, 320 and 63.3 μA. Nanogenerator also have high operational lifetimes of 3,960,000, 1,260,000, 860,000 and 90,000 cycles. This review presents a comprehensive analysis of the state-of-the-art in green energy technologies focusing on the cutting-edge advancements in nanogenerator principles, simulations, material selection and applications in the emerging field of nanoscale energy conversion.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 2","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00379-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lead-free K2MnTlH6 double perovskite solar cells with WS2/CBTS interfaces achieving > 29% efficiency: a comprehensive SCAPS-1D simulation study","authors":"Okba Saidani,&nbsp;Abderrahim Yousfi,&nbsp;Mahmood M. S. Abdullah,&nbsp;Hamad A. Al-Lohedan,&nbsp;Samir Benaniba,&nbsp;Rabah Boubaaya,&nbsp;Mokhtar Djendel,&nbsp;Abdelhalim Brahimi,&nbsp;Mekuria Tsegaye Alemu","doi":"10.1007/s40243-026-00382-6","DOIUrl":"10.1007/s40243-026-00382-6","url":null,"abstract":"<div><p>This study investigates the double-perovskite hydride K₂MnTlH₆ as a promising and previously unexplored absorber for perovskite solar cells (PSCs) using the SCAPS-1D simulator. Key parameters including the electron-transport layer (WS₂), hole-transport layer (CBTS), absorber thickness, defect density, and doping concentration are systematically optimized. Results show that WS₂ and CBTS provide favorable band alignment and efficient carrier extraction, enhancing the open-circuit voltage (V_OC), short-circuit current density (J_SC), fill factor (FF), and overall power conversion efficiency (PCE). Interfacial defect densities at the WS₂/K₂MnTlH₆ and K₂MnTlH₆/CBTS interfaces are analyzed to elucidate recombination and charge-transfer behavior. Additional evaluations of series resistance, shunt resistance, and operating temperature assess device performance under realistic conditions. The optimized configuration achieves a V_OC of 1.13 V, J_SC of 34.74 mA/cm², FF of 83.56%, and a PCE of 29.41%, confirming K₂MnTlH₆ as a strong candidate for next-generation, environmentally friendly PSCs.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00382-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Agricultural waste derived biomass electrode material: recent advancements on processing, synthesis, properties and electrochemical energy storage application","authors":"Stephen O. Oyetoro,&nbsp;Akinlolu Akande,&nbsp;Joshua T. Adeleke,&nbsp;Yetunde A. Ajayeoba,&nbsp;Awodugba Ayodeji,&nbsp;Saheed A. Adewinbi","doi":"10.1007/s40243-026-00380-8","DOIUrl":"10.1007/s40243-026-00380-8","url":null,"abstract":"<div><p>Agricultural biomass offers a sustainable and cost-effective precursor for synthesizing activated carbon (AC) electrodes in energy storage systems, addressing both the global energy crisis and the environmental challenges of fossil-based materials. Biomass-derived carbons have gained increasing attention for supercapacitor applications due to their natural abundance, tunable porosity, and excellent electrochemical properties. This review critically examines recent progress in processing routes, activation strategies, and structure-property relationships of AC derived from agricultural wastes. Emphasis is placed on emerging approaches such as heteroatom doping, template-assisted activation, and composite design that enhance energy density and cycling stability. The novelty of this work lies in its integrated analysis of synthesis–performance correlations and the identification of future pathways toward scalable, green production of high-performance, biomass-derived AC electrodes for next-generation supercapacitors.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00380-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From atoms to systems: machine learning in the clean energy materials revolution","authors":"Marco Fronzi,&nbsp;Catherine Stampfl,&nbsp;Enrico Traversa","doi":"10.1007/s40243-026-00374-6","DOIUrl":"10.1007/s40243-026-00374-6","url":null,"abstract":"<div><p>Machine learning (ML) has become a pervasive tool in clean-energy materials research, accelerating virtual screening, inverse design, catalyst discovery, process optimisation, and autonomous experimentation across a range of domains. This review offers a systematic and deliberately critical assessment of what that acceleration has and has not yet delivered. Across twelve application domains spanning CO<span>(_2)</span> reduction, hydrogen evolution, nitrogen reduction, ML interatomic potentials, generative inverse design, battery lifetime prediction, sustainable manufacturing, critical-material recycling, and operando characterisation, we introduce the Materials–ML Maturity Matrix (M4) to rate each domain on four dimensions: data reliability, model robustness, experimental and industrial readiness, and generalisation stability. No domain currently achieves high ratings on all four dimensions simultaneously. Four findings emerge from this analysis. First, ML performance outside training distributions is consistently and substantially lower than benchmark results indicate. Second, experimental validation rates for ML-generated candidates remain below 5–10% in inverse-design workflows, and adsorption-energy predictions in catalysis routinely diverge from experiment by more than 0.3 eV. Third, cross-facility reproducibility of autonomous laboratory results has not been established at scale. Fourth, no ML-designed material has yet outperformed the state of the art across the combined metrics of activity, selectivity, stability, and cost in any application area reviewed. Battery lifetime prediction and manufacturing optimisation represent genuinely mature and industrially relevant applications. NRR catalysis and fully autonomous discovery remain at an early, largely conceptual stage. The most binding constraints across domains are infrastructural—data quality, benchmark integrity, and uncertainty quantification—rather than architectural. A five-year priority roadmap grounded in the M4 analysis identifies the interventions most likely to convert ML’s demonstrated acceleration into genuine transformation of clean-energy materials development.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00374-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis, optical bandgap analysis, and refractive index study of Ba0.5Sr0.5Fe12O19 hexaferrite via sol–gel auto-combustion for multifunctional optoelectronic applications","authors":"Ala Ben Abderrazak Hajji,&nbsp;Ahmed Dhahri,&nbsp;Omar Radhi Alzoubi,&nbsp;Radhia Dhahri,&nbsp;Essebti Dhahri,&nbsp;Benilde F. O. Costa","doi":"10.1007/s40243-026-00369-3","DOIUrl":"10.1007/s40243-026-00369-3","url":null,"abstract":"<div><p>During the last few years, new materials for multifunctional optoelectronic applications have been developed with the aim of generating eco-friendly and renewable solar energy, therefore reducing the cost of electricity production and improving luminous efficiency through a simple manufacturing process. In the present work, the nano powder Ba_0.5Sr_0.5Fe₁₂O₁₉ hexaferrite sample was successfully synthetized via the sol gel auto-combustion process and was characterised by room temperature X-ray diffraction (XRD) and UV–Visible-NIR spectroscopy. The structural study proved that the studied sample crystallises according to the hexagonal system with the (P6₃/mmc) space group. The spectral behaviour of absorbance proves that the studied sample exhibits a broad absorption in the UV–Visible light region as well as a tunable direct optical gap of 1.81 eV. Further analysis of the extinction coefficient, refractive index, dispersion parameters, optical dielectric constant, nonlinear optical parameters as well as optical conductivity were highlighted and investigated in order to undertake a deeper and better insight into the optoelectronic behaviour of hexaferrite compound. The obtained results place emphasis on a powerful luminous efficiency as well as the suitability of the studied Ba_0.5Sr_0.5Fe₁₂O₁₉ hexaferrite compound for the manufacture of optoelectronic devices.</p></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"15 3","pages":""},"PeriodicalIF":6.6,"publicationDate":"2026-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-026-00369-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}