International Journal of Hydrogen Energy最新文献

{"title":"Improved stabilization mechanisms of CH4+H2 lifted flames using laminar non-premixed jets with fuel dilution","authors":"Dong Seok Jeon,&nbsp;Nam Il Kim","doi":"10.1016/j.ijhydene.2025.150763","DOIUrl":"10.1016/j.ijhydene.2025.150763","url":null,"abstract":"<div><div>The stabilization mechanisms of lifted methane flames were investigated by employing fuel-dilution with hydrogen and various inert gases (He, N₂, and CO₂). The lift-off heights were measured, and the flame shapes were discussed. Representative flame structures were visualized using images obtained simultaneously from shadowgraph and OH-PLIF. When the Schmidt number was larger than unity, ordinary laminar lifted flames with similarity solutions could be formed far downstream using small tubes. Additional laminar lifted flames could be formed when the lift-off heights were smaller than the theoretical laminar mixing core. These were classified into a lower jet velocity (LJV) regime and a higher jet velocity (HJV) regime. In the LJV regime, fuel-dilution helped flame stabilization. In the HJV regime, jet break-up occurred, and the flow transferred to turbulence. Nevertheless, the OH-PLIF image at the flame front showed sharp edge structures in most cases, and the flame stabilization could be explained based on laminar flame theories. Lifted flames could be stabilized more easily in the He-dilution cases. In the LJV regime, lifted stable flames could be explained based on the effective (or local) Schmidt number, considering local concentration, which was larger than unity near the fuel tube. In the HJV regime, flame quenching and flow re-direction in the mixing layer induced lift-off in the N₂- and CO₂-dilution cases. Finally, an improved stabilization map with six modes was proposed for lifted flames in the laminar fuel jets.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150763"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750255","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":"Efficient energy management strategy for reducing the hydrogen consumption of hybrid fuel cell/supercapacitor/battery microgrid","authors":"Ahmed Fathy,&nbsp;Shaher A. Alfayyadh","doi":"10.1016/j.ijhydene.2025.150715","DOIUrl":"10.1016/j.ijhydene.2025.150715","url":null,"abstract":"<div><div>Due to their strong penetration rates in numerous applications, fuel cells (FCs) have attracted a lot of attention in recent years. They are now widely used in numerous applications, such as recharging electric vehicles, clean energy production, and power system backup during emergency situations. However, they respond slowly to loads with a lot of change in their level. This shortage can be solved through integrating supercapacitor (SC) and battery storage with FC, an energy management strategy (EMS) is essential to manage the energy between the considered devices. Therefore, this paper presents an emergency hybrid power system suitable for powering aircraft comprising FC, battery, and SC. Also, an EMS to monitor the energy generation and control the battery and SC charging/discharging as well as reduce the hydrogen consumption is proposed via a new metaheuristic optimization approach named mud ring algorithm (MRA). Reducing the hybrid system's hydrogen consumption is the primary goal. The proposed MRA-based EMS is compared with different reported and conventional strategies like state machine control strategy (SMCS), classical proportional-integral control strategy (CPICS), frequency decoupling and state machine control strategy (FD&amp;SMCS), equivalent consumption minimization strategy (ECMS), external energy maximization strategy (EEMS), and other programmed metaheuristic approaches including grey wolf optimizer (GWO) and skill optimization algorithm (SOA). The suggested MRA outperforms other optimization approaches as it incorporates a multi-resolution adaptive mechanism that alternates between global and local searches on a constant basis, allowing it to avoid local optima and converge faster. Also, life cycle cost and environmental impact analysis is performed to assess the suggested approach. The simulation is implemented using MATLAB software and Simulink environment. In terms of hydrogen consumption, the proposed MRA had the best value of 19.4647 gm, followed by SOA with 19.502 gm and GWO with 19.615 gm. The highest efficiencies are 85.67 %, 84.88 %, and 84.39 % obtained by MRA, GWO, and SOA, respectively. The outcomes demonstrated the suggested MRA-based EMS's suitability and reliability in managing the energy between the considered devices.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150715"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750424","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":"Magnetic field-enhanced hydrogen electrocatalysis: Unveiling the role of electrolyte concentration","authors":"Konrad Eiler ,&nbsp;Jordi Sort ,&nbsp;Eva Pellicer","doi":"10.1016/j.ijhydene.2025.150601","DOIUrl":"10.1016/j.ijhydene.2025.150601","url":null,"abstract":"<div><div>The hydrogen evolution reaction at Ni foam electrodes is enhanced by magnetic fields of up to 12 kOe applied perpendicular to the electric field. While in 1 M KOH, the beneficial change in overpotential at an applied field is on the order of 10 mV, the effect increases drastically when the concentration of OH<span><math><msup><mrow></mrow><mrow><mo>−</mo></mrow></msup></math></span> is reduced to 0.1 M and 0.01 M, respectively, leading to a change in overpotential of up to 200 mV at the lowest concentration of OH<span><math><msup><mrow></mrow><mrow><mo>−</mo></mrow></msup></math></span>, making the reaction significantly more energy-efficient. The addition of KCl as a supporting electrolyte effectively suppresses adverse effects originating from the low conductivity of 0.01 M KOH while preserving the advantageous effects of the magnetic field. Finally, the effects are studied in neutral 1 M KCl, likewise leading to an improvement in HER of up to 200 mV in overpotential, and in filtered seawater, where the overpotential improves by 28 mV when applying 12 kOe. The effects of magnetic fields on HER are shown to be reversible, and scale with the magnitude of the field. In addition to chronopotentiometry at −10 mA where magnetic field pulses generate a pulse in the HER overpotential, measurements are complemented by linear sweep voltammetry and electrochemical impedance spectroscopy.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150601"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750426","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":"Modulation of the electronic structure of AuIr alloy anchor on vacancy–deficient Nb2O5-x as OER electrocatalyst for PEM water electrolysis","authors":"Guoxiang Wang,&nbsp;Taipu Chen,&nbsp;Dahui Fang,&nbsp;Jinkai Hao,&nbsp;Zhigang Shao","doi":"10.1016/j.ijhydene.2025.150177","DOIUrl":"10.1016/j.ijhydene.2025.150177","url":null,"abstract":"<div><div>The development of highly active and stable catalysts of oxygen evolution reaction (OER) plays a crucial role in proton-exchange-membrane water electrolysis (PEMWE). Herein, an electronic modulate was used to fabricate oxygen defect-rich and supported metal catalysts AuIr/Nb₂O_5-x, and it promoted the sluggish kinetics and low efficiencies of OER with the interaction between oxygen defects and the active sites. The Nb–O defect with an electron redistribution and manipulated active electronic state tailored the OER performance. The Ir actively exposed the AuIr/Nb₂O_5-x-500 catalyst, which exhibited a low overpotential of 230 mV and maintained an excellent stability for 200 h at the current density of 10 mA cm⁻² in 0.5 M H₂SO₄ electrolyte. Furthermore, the PEMWE using AuIr/Nb₂O_5-x-500 as the anode revealed a high water-splitting performance (1.61 V @ 0.5 A cm⁻²&amp; 1.70 V @ 1 A cm⁻²). In-situ Raman spectra and theoretical calculations revealed the electronic structure of AuIr/Nb₂O_5-x-500 and the mechanism of OER processes, which rationalized the improved performance through the synergistic effect of metal–support interaction and defect effect.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150177"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750430","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":"First-principles investigation of the hydrogen storage potential of Rb2AlInH6 double perovskite hydride","authors":"Yuchen Jiang ,&nbsp;Asghar Hussain ,&nbsp;Muhammad Khuram Shahzad ,&nbsp;Abhinav Kumar ,&nbsp;Bhavesh Kanabar ,&nbsp;M.M. Rekha ,&nbsp;T. Krithiga ,&nbsp;Jajneswar Nanda ,&nbsp;Vivek Kumar Pandey ,&nbsp;Vineet Tirth ,&nbsp;Mohamed Hussien","doi":"10.1016/j.ijhydene.2025.150730","DOIUrl":"10.1016/j.ijhydene.2025.150730","url":null,"abstract":"<div><div>The future applications of perovskite hydride materials in hydrogen storage, a vital constituent of renewable energy systems, have drawn a lot of interest. In this research work, CASTEP software is used to investigate optoelectronic, structural, mechanical, thermodynamic, and H storage features of Rb₂AlInH₆ hydride alloys. Rb₂AlInH₆ has space group 225 (Fm-3m) based on its structural properties, and its optimal lattice parameters and volume are 8.64 Å and 645.52 Å³, respectively. Gravimetric measurements of Rb₂AlInH₆ hydrides demonstrate a storage capacity of 2.19 wt%. The computed electronic features of Rb₂AlInH₆ hydrides with bandgap 0.132 eV show that they are semiconductors. Under mechanical features, the elastic constants, bulk modulus (24.07), shear modulus (14.95) Poisson's ratio (0.24), anisotropy (0.711), micro hardness (2.596), and Pugh's ratio (1.61) of Rb₂AlInH₆ are computed. The Born conditions for the elastic parameters <span><math><mrow><mo>(</mo><msub><mi>C</mi><mrow><mi>i</mi><mi>j</mi></mrow></msub><mo>)</mo></mrow></math></span> show that Rb₂AlInH₆ is stable mechanically, although positive phonon frequencies and formation energy (−1.021 eV/atom) express that the hydride is dynamically stable. The brittle behavior is exposed by the Cauchy's pressure (C = −1.19). Rb₂AlInH₆ hydride is disguised to be electrically conductive by its electronic properties. Our outcomes offer awareness into the potential applications of Rb₂AlInH₆ perovskite hydride material for H storage.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150730"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750433","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":"Hydrothermally synthesized binder free nickel oxide (NiO) with different morphologies on nickel foam in hydrogen evolution reaction","authors":"Sajjad Sayyar,&nbsp;Samira Yousefzadeh","doi":"10.1016/j.ijhydene.2025.150498","DOIUrl":"10.1016/j.ijhydene.2025.150498","url":null,"abstract":"<div><div>The intrinsic barriers of alkaline hydrogen evolution reaction (HER) and the scarcity of platinum-group metals demand electrocatalysts that balance activity, durability, and cost. This work presents nickel oxide/nickel foam (NiO/NF) electrodes with different morphologies (nanoporous, nanoparticle and nanograin) that synthesized by hydrothermal technique. Based on the results, nanoporous NiO/NF surpassed nanoparticle and nanograin NiO/NF in HER performance. The nanoporous NiO/NF exhibited an overpotential of 185 mV at −10 mA cm, a Tafel slope of 82.7mV dec⁻¹, and an electrochemical surface area (ECSA) of 299 cm². The interconnected pore network of the nanoporous NiO/NF provide active sites while electrochemical activation removes passivation layers, for further enhancing activity. These results highlight morphological engineering as a critical strategy for developing efficient, non-precious HER electrocatalysts and advancing scalable water electrolysis.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150498"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750429","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":"Spatial charge separation in dual-functional NiPc/ZnIn2S4 photocatalysis for hydrogen production and selective oxidation","authors":"Shuai Wang ,&nbsp;Yang Yang ,&nbsp;Changhao Yao ,&nbsp;Yuying Fan ,&nbsp;Jianan Liu ,&nbsp;Baojiang Jiang","doi":"10.1016/j.ijhydene.2025.150776","DOIUrl":"10.1016/j.ijhydene.2025.150776","url":null,"abstract":"<div><div>Hydrogen evolution coupled with selective alcohol oxidation presents an energy-efficient approach for the simultaneous generation of clean energy and the synthesis of high-value chemicals. However, the efficiency of such processes is often limited by rapid charge recombination and the scarcity of dual-functional active sites in conventional photocatalysts. In this study, we propose a rationally designed heterostructure that integrates ZnIn₂S₄ nanosheets with nickel phthalocyanine (NiPc) via an electrostatic assembly strategy. In situ X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations confirm the strong electronic interaction between ZnIn₂S₄ and NiPc, which facilitates photogenerated charge migration. Specifically, ZnIn₂S₄ acts as the oxidation-active site for alcohol dehydrogenation, while NiPc serves as a reduction cocatalyst to promote proton reduction. The spatial separation of redox-active centers effectively minimizes charge recombination and enhances interfacial electron-proton transfer. The optimized NiPc/ZnIn₂S₄ composite demonstrates exceptional performance, achieving a hydrogen production rate of 18.2 mmol g⁻¹ h⁻¹ and a benzaldehyde production rate of 15.3 mmol g⁻¹ h⁻¹ under simulated sunlight. Notably, the composite exhibits a remarkable apparent quantum efficiency of 10.4 % at 420 nm. This work highlights a spatial charge separation paradigm for dual-functional photocatalysis for simultaneous energy production and chemical synthesis.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150776"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750431","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":"Impact of hydrogen exposure on the integrity of shale caprock for underground hydrogen storage","authors":"U.C. Iyare,&nbsp;A. Zandanel,&nbsp;C.W. Neil,&nbsp;B. K C,&nbsp;M. Rock,&nbsp;W. Li,&nbsp;L.P. Frash,&nbsp;R.P. Currier,&nbsp;T. German,&nbsp;M.R. Gross","doi":"10.1016/j.ijhydene.2025.150706","DOIUrl":"10.1016/j.ijhydene.2025.150706","url":null,"abstract":"<div><div>Underground hydrogen storage (UHS) in geological formations is a promising solution for large-scale, long-term energy storage, but its success depends on the integrity of the caprock seals. This study investigates how hydrogen (H₂) exposure affects the geochemical and geomechanical responses of four potentially sealing shales (Tumey, Kreyenhagen, Santos, and Wolfcamp shales), selected for their varied mineralogy, lithology, and organic content. Shale samples were exposed for 30 days to H₂-saturated brine under high-pressure, high-temperature conditions in a batch reactor. Samples were characterized before and after exposure to H₂ using scanning electron microscopy (SEM), X-ray fluorescence (XRF) and X-ray diffraction (XRD), along with ultrasonic velocity measurements to assess changes in dynamic elastic properties. SEM revealed minor surface alterations, including localized calcite dissolution in Kreyenhagen and Santos shales and minor surface cracking in Tumey shale. After H₂-brine exposure, dynamic Young's modulus decreased by 16.6 % (Tumey), 9.0 % (Kreyenhagen), 15.5 % (Santos), and 3.1 % (Wolfcamp). However, argon-brine control experiments showed equal or greater reductions in Young's modulus of 26.9 % (Tumey), 13.1 % (Kreyenhagen), 5.6 % (Santos), and 6.0 % (Wolfcamp). These results indicate that the H₂-induced geomechanical weakening is minimal, and that brine-rock disequilibrium, not hydrogen reactivity is the primary driver of observed changes. These findings also suggest that H₂ does not significantly compromise caprock mechanical integrity under the tested conditions. This study supports the viability of using shales with a range of organic content as effective caprock seals for UHS and provides critical insight for assessing the long-term safety of such storage sites.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"161 ","pages":"Article 150706"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757637","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":"Retraction notice to: “Evaluating sustainable energy pathways: Economic perspective on advanced hydrogen production” [Int J Hydrogen Energy 93 (2024) 1462–1473]","authors":"Muhammad Khalid Anser ,&nbsp;Ali Sajid ,&nbsp;Rubab Javid ,&nbsp;Azer Dilanchiev ,&nbsp;Zahoor Ahmed","doi":"10.1016/j.ijhydene.2025.150800","DOIUrl":"10.1016/j.ijhydene.2025.150800","url":null,"abstract":"","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150800"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144758018","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":"Multi-objective parameter optimization and performance evaluation of indirect precooled engine with multi-branch closed Brayton cycle","authors":"Zhu Lan,&nbsp;Chengkun Lv,&nbsp;Chen Kong,&nbsp;Ziao Wang,&nbsp;Juntao Chang","doi":"10.1016/j.ijhydene.2025.150702","DOIUrl":"10.1016/j.ijhydene.2025.150702","url":null,"abstract":"<div><div>Indirect precooled engines (IPE) with a multi-branch closed Brayton cycle (MBCBC) have potential performance advantages in air-breathing hypersonic propulsion due to complex cycle configurations. This paper conducts a design performance evaluation and cycle parameter optimization for the IPE with MBCBC. A mathematical model is established, and a composite optimization framework integrating sensitivity analysis and multi-objective optimization (MOP) is proposed. Sensitivity analysis results identify the optimal design parameters as: air precooling temperature, helium-air mass flow ratio, flow distribution ratio of the tandem cooling-compression system, and helium compressor pressure ratio. Under identical hydrogen consumption, MOP increases specific thrust by 3.329 % and specific impulse by 3.071 %. But the further performance improvement is limited by hydrogen path components and overall work capacity. A comparison of MOP results demonstrates that the composite optimization framework enhances convergence and can provide critical design insights for performance improvement of other systems with complex cycle configurations.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"162 ","pages":"Article 150702"},"PeriodicalIF":8.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750254","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}