International Journal of Hydrogen Energy最新文献

{"title":"An engineering strategy through support structures to tailor composite membranes with high-performance for alkaline water electrolysis","authors":"Yuanzhong Gao ,&nbsp;Jian You ,&nbsp;Miao Zhang ,&nbsp;Congxiang Li ,&nbsp;Wei Wang ,&nbsp;Mengke Jia ,&nbsp;Yongzhao Li ,&nbsp;Yu Zhang ,&nbsp;Yingzhen Zhang ,&nbsp;Yuekun Lai ,&nbsp;Huaiyin Chen ,&nbsp;Longmin Liu ,&nbsp;Meihua Wu ,&nbsp;Weilong Cai","doi":"10.1016/j.ijhydene.2026.153915","DOIUrl":"10.1016/j.ijhydene.2026.153915","url":null,"abstract":"<div><div>The development of high-performance, durable composite membranes is a critical challenge for advancing green hydrogen production via alkaline water electrolysis (AWE). However, current research predominantly focuses on modifying inorganic materials, while the influence of supporting structures on the structure-performance relationship of composite membranes remains substantially underexplored. Herein, we propose an engineering design strategy for regulating membrane structures through support structures. Simulations and experimental results of water flow within the support structure indicate that the phase inversion rate can be effectively regulated through fibers featuring anisotropic orientation and pore size. The obtained non-woven fabric (NWF) membrane exhibits a gradient-oriented pore structure with a dense skin layer, finger-shaped pore layer, dense support layer, and sponge-shaped pore layer. It exhibits low area resistance (∼0.139 Ω cm²) and high bubble point pressure (BPP) of 6.81 bar. Additionally, the NWF membrane exhibits excellent stability for over 1000 h. Besides, the purity of H₂ and O₂ achieves 99.985% and 99.916% at 2.4 V, respectively. This study provides a reference value for preparing high-performance composite membranes with balanced ion transport and gas barrier capacity.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153915"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catalytic reforming in the process of hydrogen hydrocarbons, such as n-heptan, using catalysts and high temperatures","authors":"Shukur N. Nasirov ,&nbsp;Shikar G. Mamedov ,&nbsp;Sanan R. Neymetov","doi":"10.1016/j.ijhydene.2026.153857","DOIUrl":"10.1016/j.ijhydene.2026.153857","url":null,"abstract":"&lt;div&gt;&lt;div&gt;&lt;strong&gt;Catalytic Reforming of Hydrocarbon Feedstocks for Hydrogen (H&lt;sub&gt;2&lt;/sub&gt;) Production: Thermophysical Optimization Using n-Heptane as a Model Compound.&lt;/strong&gt; The global transition toward sustainable energy systems places hydrogen (H&lt;sub&gt;2&lt;/sub&gt;) at the forefront of scientific and technological innovation. As a clean fuel with high energy density and zero carbon emissions at the point of use, hydrogen (H&lt;sub&gt;2&lt;/sub&gt;) is a key enabler in decarbonizing power generation, transportation, and industrial processes. However, the realization of a hydrogen (H&lt;sub&gt;2&lt;/sub&gt;)-based economy requires scalable, efficient, and regionally adaptable production methods that minimize environmental impact and integrate seamlessly into existing infrastructure. This study presents a comprehensive theoretical and experimental analysis of hydrogen (H&lt;sub&gt;2&lt;/sub&gt;) production via catalytic reforming of hydrocarbon feedstocks, with a focus on n-heptane as a model compound. The research addresses critical challenges in H&lt;sub&gt;2&lt;/sub&gt; generation, including reaction kinetics, heat and mass transfer, catalyst stability, and measurement accuracy under high-temperature and supercritical conditions that promote effective H&lt;sub&gt;2&lt;/sub&gt; release. The selection of n-heptane is based on its well-characterized thermophysical properties and its representativeness of heavier petroleum fractions, ensuring experimental reproducibility and applicability to real-world feedstocks for H&lt;sub&gt;2&lt;/sub&gt; production. Catalytic reforming of n-heptane initiates dehydrogenation reactions, leading to hydrogen (H&lt;sub&gt;2&lt;/sub&gt;) release according to the scheme:&lt;/div&gt;&lt;div&gt;&lt;strong&gt;C&lt;sub&gt;7&lt;/sub&gt;H&lt;sub&gt;16&lt;/sub&gt; → C&lt;sub&gt;7&lt;/sub&gt;H&lt;sub&gt;14&lt;/sub&gt; + H&lt;sub&gt;2&lt;/sub&gt;&lt;/strong&gt;&lt;/div&gt;&lt;div&gt;The objective of this research is to validate the feasibility of producing hydrogen (H&lt;sub&gt;2&lt;/sub&gt;) through thermocatalytic reforming of n-heptane using a custom-designed experimental setup that simulates industrial conditions. The system enables precise control of temperature, pressure, flow rate, and catalyst composition, allowing systematic exploration of reaction regimes and their impact on H&lt;sub&gt;2&lt;/sub&gt; yield and selectivity. Special attention is given to supercritical conditions, which enhance convective heat transfer, accelerate reaction kinetics, and improve energy efficiency, positioning catalytic reforming as a promising alternative to conventional hydrogen (H&lt;sub&gt;2&lt;/sub&gt;) production methods such as steam methane reforming (CH&lt;sub&gt;4&lt;/sub&gt; + H&lt;sub&gt;2&lt;/sub&gt;O → CO + 3H&lt;sub&gt;2&lt;/sub&gt;), water electrolysis (2H&lt;sub&gt;2&lt;/sub&gt;O → 2H&lt;sub&gt;2&lt;/sub&gt; + O&lt;sub&gt;2&lt;/sub&gt;), and biomass gasification. Experiments were conducted in vertical, horizontal, and inclined pipe configurations to investigate the influence of geometry on thermal gradients, fluid dynamics, and catalyst performance in H&lt;sub&gt;2&lt;/sub&gt; evolution. The integration of high-precision thermocouples, pressure sensors, flow meters, and electronic potentiometers enabled real-time dat","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153857"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147424303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Type-II engineered p-Co3O4/n-ZnO heterojunctions: Mechanistic insights into high-efficiency solar-driven hydrogen evolution and dye degradation","authors":"Sandhya S. Gadge ,&nbsp;Muthupandian Ashokkumar ,&nbsp;Ratna Chauhan ,&nbsp;Suresh W. Gosavi","doi":"10.1016/j.ijhydene.2026.153646","DOIUrl":"10.1016/j.ijhydene.2026.153646","url":null,"abstract":"<div><div>Cobalt oxide–zinc oxide (p-Co₃O₄/n-ZnO) nanocomposites with varied molar ratios were successfully synthesized via a facile hydrothermal method and systematically investigated for photocatalytic applications. Comprehensive structural, optical, and surface characterizations using XRD, UV–Vis, Raman, FTIR, FESEM, EDAX, XPS, UPS, BET, and HR-TEM confirmed the formation of well-defined heterojunctions comprising cubic Co₃O₄ and hexagonal ZnO phases. Incorporation of Co₃O₄ induced a pronounced red shift in absorption and band-gap narrowing, rendering the composites highly responsive to visible light. Ultraviolet photoelectron spectroscopy revealed a high work function of 5.90 eV, indicating strong surface electron binding and promoting effective charge separation. Raman spectroscopy validated the interfacial coupling, while HR-TEM provided direct evidence of coherent lattice fringes between ZnO and Co₃O₄, highlighting the robust construction of the heterojunction. FESEM images displayed uniform nanoscale assemblies (&lt;30 nm), and the increased surface area further enhanced photocatalytic activity. Photoluminescence spectroscopy confirmed suppressed recombination of photogenerated charge carriers. Mechanistic studies revealed that the heterojunction operates via a Type-II scheme, effectively preserving highly reducing electrons in the ZnO conduction band and strongly oxidizing holes in the Co₃O₄ valence band, which underpins the enhanced photocatalytic hydrogen evolution and dye degradation. As a result, the optimized composite achieved remarkable photocatalytic efficiency, degrading 91% of orange-red dye within 10 min and exhibiting a 3.2- and 2.4-fold enhancement compared to pristine Co₃O₄ and ZnO, respectively. Moreover, the nanocomposite demonstrated a high hydrogen generation rate of about 2643 μmol h⁻¹g⁻¹ under direct sunlight, governed by pseudo-first-order kinetics. These findings highlight the synergistic role of band-gap tuning, high work function, and interfacial heterojunction engineering, positioning p-Co₃O₄/n-ZnO nanocomposites as promising candidates for sustainable energy and environmental remediation technologies.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153646"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ni nanolayers deposited on Nb2CTx/CNT synergistically enhance alkaline bifunctional HER/OER catalytic activity","authors":"Zengkun You,&nbsp;Tian Tang,&nbsp;Kai Ou,&nbsp;Yuxiang Ni,&nbsp;Yudong Xia,&nbsp;Hongyan Wang","doi":"10.1016/j.ijhydene.2026.153944","DOIUrl":"10.1016/j.ijhydene.2026.153944","url":null,"abstract":"<div><div>The escalating global energy crisis has intensified research efforts toward developing heterogeneous structures capable of addressing the sluggish kinetics of the hydrogen evolution reaction and oxygen evolution reaction in electrocatalysis. In this study, a novel strategy for the design of highly efficient bifunctional electrocatalysts was proposed. Uniform Ni nanolayers were successfully deposited on Nb₂CT_x/CNT hybrid supports through a combination of CVD and magnetron sputtering techniques. The resulting Ni/Nb₂CT_x/CNT@NF catalyst demonstrated exceptional electrocatalytic performance in 1 M KOH. For HER, it achieved remarkably low overpotentials of 41 mV@10 mA cm⁻² and 196 mV@100 mA cm⁻². Similarly, for OER, the catalyst exhibited outstanding activity with overpotentials of 299 mV@20 mA cm⁻² and 337 mV@50 mA cm⁻². Furthermore, the catalyst maintained stable performance at 20 mA cm⁻² for 48 h without significant degradation, highlighting its excellent long-term stability. The superior catalytic performance can be attributed to several key factors: (1) The uniform distribution of Ni nanolayers enhances intrinsic conductivity and increases the density of active sites; (2) The incorporation of CNTs expands the reaction interface, facilitating charge and mass transfer; and (3) The electronic interaction between Nb₂CT_x and Ni further optimizes the catalytic kinetics.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153944"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular insights into combustion inhibition of hydrogen-doped methane by perfluoro-2-methyl-3-pentanone","authors":"Yuyu Wang ,&nbsp;Yutong Chen ,&nbsp;Yong Pan ,&nbsp;Xin Zhang","doi":"10.1016/j.ijhydene.2026.153913","DOIUrl":"10.1016/j.ijhydene.2026.153913","url":null,"abstract":"<div><div>Hydrogen-doped methane (CH₄/H₂) represents a promising clean fuel; however, it presents notable safety hazards owing to the broad flammability range and low ignition energy of H₂. Effective combustion inhibition is crucial for safe utilization. Herein, reactive force field molecular dynamics (ReaxFF MD) simulations are used to elucidate the atomic-scale inhibition mechanism of perfluoro-2-methyl-3-pentanone (C₆F₁₂O) on its combustion. It is found that with the addition of C₆F₁₂O from 0% to 13%, the apparent activation energy is increased from 162.65 to 172.92 kJ/mol, and the heat release is reduced. Approximately 37.8% of C₆F₁₂O decomposes into ·C₃F₇ and C₂F₅ĊO, further generating ·F and ·CF₃, which effectively scavenge the critical ·H and ·OH to form stable HF and CF₂O. The inhibition effect exhibits a clear temperature dependence, with the optimal concentration identified as 7% at 2400 K. These findings provide novel molecular-level insights into the radical-interrupting mechanism of C₆F₁₂O for safer H₂-enriched fuel systems.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153913"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eucalyptus gasification-driven energy system for sustainable hydrogen-rich synthesis gas and energy Production: Modeling, analysis, and AI-based multi-objective optimization","authors":"Delina Sangsefidi,&nbsp;Parisa Mojaver","doi":"10.1016/j.ijhydene.2026.153939","DOIUrl":"10.1016/j.ijhydene.2026.153939","url":null,"abstract":"<div><div>This study presents a biomass-driven hybrid energy system designed to enhance efficiency while reducing environmental impacts through a comprehensive thermodynamic, economic, and environmental assessment framework. The proposed system integrates an air-fed eucalyptus gasifier with a supercritical carbon dioxide Brayton cycle, an organic Rankine cycle, and heat recovery units to simultaneously produce syngas, electricity, heated water, and heated air. The system is modeled and simulated using Engineering Equation Solver, and the results are validated against available literature data. In addition to conventional energy analysis, detailed exergy, exergo-economic, and environmental analyses are conducted to identify thermodynamic irreversibility, cost formation mechanisms, and CO₂ emission characteristics using power-based, heat-based, and outputs-based indicators. Second-order regression-based machine learning models are developed to enable an accurate and computationally efficient six-objective optimization, targeting electrical efficiency, thermal efficiency, cold gas efficiency, total power output, heated water, and heated air. The optimization results indicate an optimal gasification temperature of 864.6 °C and a supercritical carbon dioxide Brayton cycle compression ratio of 2.86, yielding a maximum total power output of 163.6 kW, an electrical efficiency of 7.7%, a thermal efficiency of 4.0%, a cold gas efficiency of 80.6%, a heated water of 345 L/s, and a heated air of 112 m³/s. The combined integration of advanced thermodynamic analyses with AI-assisted optimization provides a novel and holistic framework for the design and sustainability-oriented optimization of biomass-based hybrid energy systems.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153939"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Membrane-integrated process for simultaneous biogas upgrading and hydrogen storage via methanol","authors":"Luigi Marsico ,&nbsp;Adele Brunetti ,&nbsp;Enrico Catizzone ,&nbsp;Massimo Migliori ,&nbsp;Giuseppe Barbieri","doi":"10.1016/j.ijhydene.2026.153938","DOIUrl":"10.1016/j.ijhydene.2026.153938","url":null,"abstract":"<div><div>This work presents the design of a membrane-integrated process for biogas valorisation and renewable hydrogen storage via CO₂-to-methanol conversion. The process maximizes CO₂ utilisation by incorporating H₂ from renewable sources, while simultaneously separating methane from biogas to produce a stream suitable for direct injection into the natural gas grid. Membrane units are integrated upstream and downstream of the methanol synthesis reactor: upstream membranes allow to obtain a CO₂-rich stream for methanol production and a CH₄-rich stream compliant with grid specifications, while downstream membranes recover unreacted CO₂ and H₂ for recycling, minimizing emissions and hydrogen losses.</div><div>The system is analysed in a step/stage configuration using performance maps from a validated one-dimensional model, accounting for the selectivity and permeance of a polyimide membrane. Results show that biogas can be fully valorised, achieving 98.5% CH₄ recovery with molar purity ≥97.5% and ∼97% CO₂ conversion to methanol, with nearly complete utilisation of renewable hydrogen. This membrane-integrated approach provides an effective strategy for coupling biogas upgrading with renewable hydrogen storage, enabling sustainable energy storage in the form of methanol e-fuels and contributing to carbon-neutral energy pathways.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153938"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CuO/NiFe2O4 composite as a bifunctional electrocatalyst for alkaline water splitting in hydrogen generation application","authors":"Thangesh Thanesh ,&nbsp;Anuradha Ramani ,&nbsp;Nagarajan Srinivasan ,&nbsp;Sabarinathan Venkatachalam","doi":"10.1016/j.ijhydene.2026.153910","DOIUrl":"10.1016/j.ijhydene.2026.153910","url":null,"abstract":"<div><div>The growing scarcity of conventional energy sources increases the need for sustainable alternatives, and hydrogen emerges as a promising option despite challenges in production, storage, and distribution. This study presents a transition-metal-oxide (TMO) composite, CuO/NiFe₂O₄ (CuNiFe), which functions as a bifunctional electrocatalyst for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in alkaline medium. The catalyst requires overpotentials of 123 mV for HER and 378 mV for OER at 10 mA cm⁻². Its HER Tafel slope of 104 mV dec⁻¹ indicates that the rate-limiting step is electrochemical adsorption, which is consistent with the Volmer–Heyrovsky pathway under alkaline conditions. An alkaline electrolyser assembled with CuNiFe electrodes operates at 1.69 V to reach 10 mA cm⁻² in 1 M KOH. These results demonstrate that CuNiFe offers an efficient, noble-metal-free route for sustainable hydrogen production.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153910"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated modeling, screening, and optimization of the hydrogen-coke trade-off in catalytic methane pyrolysis within a fixed-bed reactor","authors":"Mahdi Abdi-Khanghah,&nbsp;Solmaz Rajabi-Firoozabadi,&nbsp;Jue Zhu","doi":"10.1016/j.ijhydene.2026.153844","DOIUrl":"10.1016/j.ijhydene.2026.153844","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Methane (CH&lt;sub&gt;4&lt;/sub&gt;) pyrolysis is a promising route to produce CO&lt;sub&gt;2&lt;/sub&gt;-free “turquoise” hydrogen (H&lt;sub&gt;2&lt;/sub&gt;), but its efficiency is hampered by coke deposition, which deactivates catalysts and clogs reactors. This study presents a novel integrated computational fluid dynamics, Plackett–Burman design, and response surface methodology (CFD-PBD-RSM) framework for optimizing CH&lt;sub&gt;4&lt;/sub&gt; pyrolysis reactors, achieving maximum H&lt;sub&gt;2&lt;/sub&gt; production while minimizing coke deposition. CFD accurately models the complex dynamics of coke deposition, which are crucial for understanding CH&lt;sub&gt;4&lt;/sub&gt; pyrolysis. The Plackett–Burman Design (PBD) provides efficient and rapid screening of process variables, identifying those with the greatest impact on the two key responses (the amount of produced coke and H&lt;sub&gt;2&lt;/sub&gt; concentration). The PBD was employed to screen eleven process variables, highlighting the most significant factors. Following this, RSM, using a central composite design (CCD), was applied for multi-objective optimization. Four key factors, temperature, catalyst loading, bed porosity, and CH&lt;sub&gt;4&lt;/sub&gt; partial pressure, were evaluated through CFD simulations to optimize both H&lt;sub&gt;2&lt;/sub&gt; production and coke deposition. The CFD model quantified the underlying trade-off that raising the reactor temperature from 837 K to 913 K intensified axial H&lt;sub&gt;2&lt;/sub&gt; production, elevating the outlet concentration from 0.28 mol m&lt;sup&gt;−3&lt;/sup&gt; to 2.02 mol m&lt;sup&gt;−3&lt;/sup&gt;. However, this simultaneously accelerated coking, increasing bed porosity loss from 3.0 % to 12.5 % and advancing the porosity-loss front toward the reactor outlet. The simulations indicated that at temperature = 880–900 K, catalyst loading = 300–350 kg m&lt;sup&gt;−3&lt;/sup&gt;, bed porosity = 0.42–0.46, and CH&lt;sub&gt;4&lt;/sub&gt; partial pressure = 0.75–0.85, the H&lt;sub&gt;2&lt;/sub&gt; concentration can be maximized while maintaining coke deposition within a controllable range. Two operational scenarios were derived from the CCD optimization. In first scenario, corresponding to maximum outlet H&lt;sub&gt;2&lt;/sub&gt; concentration (3.21–3.24 mol m&lt;sup&gt;−3&lt;/sup&gt;) controlled coke deposition (0.019 kg) was achieved at a temperature of 912.5 K, bed porosity = 0.35, CH&lt;sub&gt;4&lt;/sub&gt; partial pressure = 0.70 atm, and catalyst loading = 250 kg m&lt;sup&gt;−3&lt;/sup&gt;. In second scenario, which minimized coke formation (0.012 kg) while maintaining acceptable outlet H&lt;sub&gt;2&lt;/sub&gt; concentration (1.85–1.89 mol m&lt;sup&gt;−3&lt;/sup&gt; (occurred at a temperature = 854 K, bed porosity = 0.45, CH&lt;sub&gt;4&lt;/sub&gt; partial pressure = 0.875 lg, and catalyst loading = 250 kg m&lt;sup&gt;−3&lt;/sup&gt;. Both CCD-derived optimization scenarios were validated using CFD simulation. The CFD model confirmed that the developed hybrid model accurately predicts the responses. The findings offer a critical pathway for scaling up methane pyrolysis, directly addressing the key technical barrier of coke deposition to advance the industrial realization of turquoise hydro","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153844"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and thermodynamic analysis of a solar power plant for hydrogen generation with other beneficial outputs for a residential society","authors":"Yunus Emre Yuksel ,&nbsp;Fatih Yilmaz ,&nbsp;Murat Ozturk","doi":"10.1016/j.ijhydene.2026.153940","DOIUrl":"10.1016/j.ijhydene.2026.153940","url":null,"abstract":"<div><div>In this study, a comprehensive thermodynamic analysis of an integrated solar tower-based multigeneration system planned for the purpose of electricity, hydrogen, heating, cooling and freshwater production. The design of the system consists of a solar tower receiver with Rankine and Organic Rankine power cycles, a hydrogen production and storage unit, an absorption refrigeration system and a freshwater production plant. In the analysis part of the study, a detailed thermodynamic analysis is performed and to see the effects of basic design parameters such as reference temperature, solar irradiance, molten-salt temperature and electrolyzer efficiency, parametric analyses were calculated. For the basic design parameters, the overall energetic and exergetic efficiencies were found to be 55.29% and 51.18%. The overall exergy destruction rate of the system was calculated as 12.3 MW, mainly occurred in Rankine and hydrogen sub-plants. The results of parametric studies show that increasing solar irradiance and molten-salt temperatures have positive effects on system performance. In addition, improvement on electrolyzer efficiency makes hydrogen production more and decreases electricity consumption of the unit. The study implies that solar tower plants are useful for electricity production by high temperatures and also waste heat of each unit enables multiple production.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"216 ","pages":"Article 153940"},"PeriodicalIF":8.3,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}