International Journal of Hydrogen Energy最新文献

{"title":"Construction of covalently and coordination-linked MOF@COF heterojunctions via interfacial engineering for efficient photocatalytic hydrogen evolution","authors":"Qi Qi,&nbsp;Jiawen Liu,&nbsp;Hang Xu,&nbsp;Wei Wen,&nbsp;Zhonghua Li","doi":"10.1016/j.ijhydene.2026.156278","DOIUrl":"10.1016/j.ijhydene.2026.156278","url":null,"abstract":"<div><div>Constructing heterostructures serves as an effective strategy to address the low separation efficiency of photogenerated carriers in covalent organic frameworks (COFs). Herein, we leverage the structural features of TpBpy-COF bearing carbonyl and bipyridine moieties to fabricate covalently linked Zr-MOF-NH₂@COF and coordination-linked Zr-MOF@COF via reactions with UiO-66-NH₂ and UiO-66, respectively. The findings reveal that both Zr-MOF-NH₂@COF and Zr-MOF@COF exhibit excellent photocatalytic hydrogen evolution activity compared with the physically mixed Zr-MOF-NH₂&amp;COF and Zr-MOF&amp;COF composites, owing to the formation of tightly interfaces. In particular, Zr-MOF-NH₂@COF shows obviously improved hydrogen production performance. The optimal sample Zr-MOF–NH₂–10@COF achieves an outstanding hydrogen production rate of 37.67 mmol g⁻¹ h⁻¹, which is 1.3 times that of Zr-MOF@COF. The Zr-MOF-NH₂@COF S-scheme heterojunction facilitates charge separation and boosts photocatalytic H₂ evolution. This work compares covalently and coordination-linked MOF@COF heterostructures to guide interfacial optimization of related photocatalysts.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156278"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148502708","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":"Path-dependent thermodynamic analysis of coupled cooling and ortho-para hydrogen conversion in hydrogen liquefaction","authors":"Xinyu Wei,&nbsp;Jiajia Lai,&nbsp;Shaolong Zhu,&nbsp;Song Fang,&nbsp;Limin Qiu,&nbsp;Kai Wang","doi":"10.1016/j.ijhydene.2026.156177","DOIUrl":"10.1016/j.ijhydene.2026.156177","url":null,"abstract":"<div><div>Hydrogen liquefaction is energy intensive, and ortho-para conversion strongly affects heat release and irreversibility. This study develops a thermodynamically consistent analysis of coupled cooling and ortho-para conversion by aligning hydrogen-isomer reference states, evaluating complete conversion heat, and decomposing sensible and conversion heat along cooling paths. The method quantifies the effects of conversion start temperature and operating pressure. Delaying continuous conversion from 300 K to 160 K increases total exergy destruction by less than 0.02%, whereas starting at 40 K increases it by 12.46%. A start temperature of 100 K retains more than 99.5% of full-range continuous-conversion exergy performance. In the stream-level calculation excluding external feed compression, increasing pressure from 1 MPa to 10 MPa reduces the exergy destruction associated with cooling and ortho-para conversion by 21.33%. Compared with the single-stage isothermal limiting case, ideal continuous conversion reduces the stream-level heat-release-related exergy destruction by 32.05%. These results clarify heat-release redistribution and support thermodynamic evaluation of hydrogen liquefaction processes.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156177"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148502714","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":"Interfacial regulation of Mo-doped BiVO4 heterojunction by coupling amorphous CoWO4 for efficient photoelectrochemical water oxidation","authors":"Yaxin Wang,&nbsp;Yuanqiang Wang,&nbsp;Haozhen Zhu,&nbsp;Jing Li,&nbsp;Yichuan Rui,&nbsp;Chengjie Wang,&nbsp;Dezhi Pan","doi":"10.1016/j.ijhydene.2026.156301","DOIUrl":"10.1016/j.ijhydene.2026.156301","url":null,"abstract":"<div><div>Herein, we engineer a p-n heterojunction photoanode by uniformly depositing amorphous CoWO₄ nanoparticles onto a high-quality Mo-doped BiVO₄ (Mo:BiVO₄) thin film via a facile successive ionic layer adsorption and reaction (SILAR) strategy. Detailed investigations reveal that Mo doping enhances crystallinity, modulates the electronic structure, introduces defect-mediated trapping centers, and improves visible-light absorption for pristine BiVO₄, thereby promoting bulk charge separation. More importantly, the coupled CoWO₄ oxygen evolution cocatalyst (OEC) promotes the directional separation and migration of photogenerated charges, thereby suppressing bulk and surface recombination. Consequently, the optimized FTO/Mo-doped BiVO₄/CoWO₄ photoanode delivers an outstanding photocurrent density of 3.83 mA cm⁻² at 1.23 V vs. RHE, representing a 3.83-fold and 3.19-fold enhancement over pristine BiVO₄ and Mo:BiVO₄, respectively. The composite electrode also exhibits superior applied bias photon-to-current efficiency, a larger electrochemically active surface area, reduced charge transfer resistance, improved charge separation and injection efficiencies, and robust operational stability over 7000 s.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156301"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148502715","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":"Addressing emergency venting safety of hydrogen fuel cell trains: Full-scale experimental study of high-pressure onboard hydrogen storage tank venting","authors":"Yimeng Chen,&nbsp;Lei Xu,&nbsp;Xubin Song,&nbsp;Yankun Li,&nbsp;Wenchao Zhang,&nbsp;Hailong Wang,&nbsp;Xiuhui Jing,&nbsp;Tiancai Ma","doi":"10.1016/j.ijhydene.2026.156143","DOIUrl":"10.1016/j.ijhydene.2026.156143","url":null,"abstract":"<div><div>In emergency scenarios such as onboard fires, hydrogen fuel cell (HFC) trains may rapidly vent large quantities of hydrogen from high-pressure storage tanks, posing potential risks to passengers and surrounding infrastructure. However, existing studies mainly address secondary accidents after jet ignition, while hydrogen diffusion and transient venting flow behavior, particularly in rail-specific environments, remain insufficiently understood. This study conducted full-scale 35 MPa and 70 MPa venting experiments on HFC train storage systems to investigate gas dispersion, thermal responses, and flow dynamics. Results show pronounced anisotropic dispersion; vertical jet inertia drives peak hydrogen concentrations to 13%–23% at the simulated overhead contact line. Concurrently, adiabatic expansion causes rapid, sustained subzero cooling in key components, intensifying at higher pressures. Schlieren imaging captures the jet's transition from an under-expanded supersonic state to a turbulent plume. These mechanistic findings yield targeted safety measures, providing actionable guidelines for safety zoning, vent design, and model validation.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156143"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148502717","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 optimization of an exergy-cascaded hydrogen hub with multi-level heat recovery and high-temperature thermal support: Thermodynamic and exergy assessment, mixed-integer linear programming (MILP)-based co-design, and predictive dynamic operation","authors":"Asli Tiktas,&nbsp;Arif Hepbasli","doi":"10.1016/j.ijhydene.2026.156259","DOIUrl":"10.1016/j.ijhydene.2026.156259","url":null,"abstract":"<div><div>Although prior studies have addressed hydrogen hubs, waste-heat recovery, heat pumps, and multigeneration systems, a unified framework integrating multiple electrolysis technologies, exergy-based thermal allocation, system-level co-design, and dynamic operational validation is still lacking. To address this gap, this study proposes an exergy-cascaded hydrogen hub integrating multi-level heat-pump-assisted low- and medium-temperature heat recovery, thermal storage, and a scenario-level high-temperature thermal support branch for SOEC operation. The low- and medium-temperature branches are modelled as low-to medium-temperature heat-pump-based upgrading stages, whereas the 500–700 °C branch is treated as a technology-neutral high-temperature thermal support pathway rather than as a validated vapor-compression heat pump. Under baseline conditions, the system produces 18.64 kg/h hydrogen, delivers 250 kW district heat and 150 kW high-temperature support, utilizes 237.24 kW of 238.39 kW recoverable heat, and identifies the provision of high-temperature SOEC thermal support as the main exergy penalty.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156259"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148529656","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":"Effect of H2 and HHO enrichment on self-excited thermoacoustic instabilities in a swirl-stabilized partially premixed combustor","authors":"Manish Singh,&nbsp;Raad Rizza,&nbsp;Sudipto Mukhopadhyay,&nbsp;Midhat Talibi,&nbsp;Ramanarayanan Balachandran","doi":"10.1016/j.ijhydene.2026.156178","DOIUrl":"10.1016/j.ijhydene.2026.156178","url":null,"abstract":"<div><div>Green hydrogen produced via water electrolysis is a promising pathway for sustainable electricity generation using gas turbines. The hydrogen (H₂) and oxygen (O₂) produced are typically stored separately, though the gases can also be utilized as hydroxy gas (a stoichiometric H₂-O₂ mixture, HHO). This study experimentally investigates the influence of H₂ and HHO enrichment (0%–50% by volume) in natural gas (CH₄) on the onset and characteristics of self-excited thermoacoustic instabilities (TAI) in a swirl-stabilized, partially premixed combustor. Flame structures were resolved via OH<span><math><msup><mrow></mrow><mrow><mo>∗</mo></mrow></msup></math></span> chemiluminescence imaging using an intensified charge-coupled device (ICCD) camera. Combustor dynamics were characterized using high-frequency pressure measurements and OH<span><math><msup><mrow></mrow><mrow><mo>∗</mo></mrow></msup></math></span> chemiluminescence. Three distinct combustion regimes were observed for both enrichments: stable (0%–15%), intermittent (20%–45%), and limit-cycle oscillation (LCO) at 50% enrichment. Frequency shift was observed for higher H₂ enrichment cases but not in HHO enrichment cases. Under limit-cycle conditions, HHO enrichment produces a dual-peak periodic structure, unlike H₂ enrichment. The fuel-line signal for HHO lacks the third harmonic (<span><math><mrow><mn>3</mn><msub><mrow><mi>f</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></math></span>) as compared to H₂ fuel line due to frequency-dependent thermoviscous attenuation along the fuel-line wall and higher acoustic impedance of the HHO mixture. For comparable H₂ fractions, CH₄-HHO blends, exhibit earlier onset of intermittency and limit-cycle oscillations than CH₄-H₂ blends, highlighting the significant role of oxygen in combustion dynamics.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156178"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148529659","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":"Tuning product selectivity in CH4 nanosecond pulsed plasma: Insights in the reaction pathways by a two-zone global plasma model","authors":"Stein Maerivoet,&nbsp;Thomas Fontaine,&nbsp;Matthias Albrechts,&nbsp;François Reniers,&nbsp;Rony Snyders,&nbsp;Annemie Bogaerts","doi":"10.1016/j.ijhydene.2026.156215","DOIUrl":"10.1016/j.ijhydene.2026.156215","url":null,"abstract":"<div><div>We developed a two-zone global plasma model to investigate the formation pathways of C₂ hydrocarbons and H₂ in a CH₄ nanosecond pulsed plasma. The model does not only solve the classical species mass balance equations, but also the energy balance equations for heavy species, and the mass and energy exchange, accounting for gas heating and pressure rise during the plasma pulse. Our results reveal that the interplay between gas temperature and electron impact dissociation critically influences product selectivity. Longer pulse durations favor the formation of unsaturated hydrocarbons, whereas shorter pulse durations promote more saturated products. Excessively long pulses, however, lead to significant electron impact dissociation of C₂H₂, which may contribute to soot formation. Preheating the gas mixture for short (&lt;30 ns) pulse durations shift selectivity toward C₂H₄ and C₂H₂. These insights highlight the importance of pulse parameters and preheating strategies in controlling product selectivity in nanosecond pulsed plasmas.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156215"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148502674","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":"Comprehensive parametric effects on oxygen-enriched ammonia Wankel rotary engine combustion and emission behaviors","authors":"Hao Meng,&nbsp;Shanshan Guo,&nbsp;Baodong Ma,&nbsp;Qiang Zhan,&nbsp;Chao Ma,&nbsp;Changwei Ji,&nbsp;Du Wang","doi":"10.1016/j.ijhydene.2026.156269","DOIUrl":"10.1016/j.ijhydene.2026.156269","url":null,"abstract":"<div><div>Ammonia, as a carbon-free fuel with well-established global storage and transportation infrastructure, offers a viable zero-carbon pathway for Wankel rotary engine (WRE). The present work systematically investigates the coupled effects of oxygen enrichment (40%–100%), excess oxygen ratio (λ = 0.9–4.0) and engine speed (1500–5500 r/min) on the combustion phasing, performance and pollutant emissions of ammonia-fueled WREs. Results indicate that oxygen enrichment level is the dominant parameter governing the combustion performance: pure oxygen enables a combustion efficiency exceeding 95% across the full tested operating range, and reduces unburned NH3 slip by over 6 orders of magnitude under lean burn conditions. Significant sensitivity differences are observed between CA0-10 and CA10-90 to operating parameters, with high-speed in-cylinder turbulence effectively compensating for the inherently low laminar burning velocity of ammonia. NOx emissions exhibit a strongly non-monotonic variation trend, and a trade-off between efficiency improvement and NOx control exists under high oxygen enrichment conditions.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156269"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148529660","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-effect synergistic design of high-performance Sr0.9Ce0.1Ti0.3Fe0.6Ni0.1O3-δ anode for SOFCs: In situ exsolution and electronic structure modulation","authors":"Jiehui Liu,&nbsp;Zhao Xin,&nbsp;Ping Lei,&nbsp;Yu Peng,&nbsp;Zhe Lv","doi":"10.1016/j.ijhydene.2026.156284","DOIUrl":"10.1016/j.ijhydene.2026.156284","url":null,"abstract":"<div><div>Achieving both high catalytic activity and stability in single-phase solid oxide fuel cell (SOFC) anodes is challenging. Herein, we designed A-site Ce-doped Sr_1-x CexTi_0.3Fe_0.6Ni_0.1O_3-δ (x = 0–0.2) multiphase nanocomposite anodes comprising a perovskite matrix, Ruddlesden–Popper phase, CeO₂, and exsolved Ni–Fe alloy nanoparticles. Experiments and density functional theory (DFT) confirm that Ce doping modulates the electronic structure, enhancing H₂ adsorption on B–O surfaces. Synergistically, the CeO₂(111) plane provides hydrogen dissociation sites, while Fe sites in the Ni–Fe alloy act as catalytic centers. This multiphase synergetic effect remarkably decreases the anode polarization resistance of Sr_0.9Ce_0.1Ti_0.3Fe_0.6Ni_0.1O_3-δ at 850 °C by 45% compared with SrTi_0.3Fe_0.6Ni_0.1O_3-δ, reaching 0.30 Ω cm² in wet H₂. Moreover, the power density of single-cell is increased by 28% to 0.87 W cm⁻², and the long-term stability for 68 h is also improved. This work demonstrates A-site Ce doping and multiphase engineering as effective strategies to enhance SOFC anode kinetics.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156284"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148502673","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":"Optimizing directed charge transfer in a cascade Z-scheme heterojunction for efficient CO2 photoreduction and degradation of highly toxic organic pollutants","authors":"Muhammad Zaka Ansar,&nbsp;Nazma Faqir,&nbsp;Wajid Ali,&nbsp;Wang Ke,&nbsp;Abdul Qayum,&nbsp;Sharafat Ali,&nbsp;Ahmad Yar,&nbsp;Imran Murtaza","doi":"10.1016/j.ijhydene.2026.156294","DOIUrl":"10.1016/j.ijhydene.2026.156294","url":null,"abstract":"<div><div>Solar-driven conversion of CO₂ into high-value chemicals and fuels is critically important for effective utilization of CO₂ resources and reducing reliance on fossil fuels. Nevertheless, the sluggish separation of photogenerated electron-hole-pairs remains a significant challenge, severely constrains overall photocatalytic activity. In this work, a 2D/2D/2D cascade Z-scheme SnO₂–NiFe₂O₄/g-C₃N₄ (SO–NFO/CN) heterojunction was rationally designed with a proper energy platform to achieve highly efficient directed charge transfer and sustain strong redox ability. In this cascade Z-scheme, SnO₂ serves as an energy platform, favoring directional charge transfer. The optimized 6SO–5NFO/CN heterojunction offers higher CO₂ reduction rates of CO (53 μmolg⁻¹h⁻¹) and CH₄ (10 μmolg⁻¹h⁻¹) 32.5-fold higher than pure CN. Optimized photocatalyst also delivered significantly improved photoactivity for highly concentrated (40-ppm) pollutants: 2,4-DCP and BPA with 6.25 and 5-fold enhancements respectively. Our analysis reveals that synergistic effect originates from the Z-scheme, energy platform, and 2D-morphology which accelerate charge transfer, extend lifetime, and preserve strong redox ability, thereby significantly boost photoactivity.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"253 ","pages":"Article 156294"},"PeriodicalIF":9.2,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148502677","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}