International Journal of Hydrogen Energy最新文献

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Photocatalytic whole H2O splitting using Bi0-decorated g-C3N4/SrTiO3 sheet-like catalyst under simulated sunlight
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.302
Yen Thi Hoang Le , Jeffrey C.S. Wu , Wen-Yueh Yu , Chun-Lin Yeh , Marjeta Maček Kržmanc
{"title":"Photocatalytic whole H2O splitting using Bi0-decorated g-C3N4/SrTiO3 sheet-like catalyst under simulated sunlight","authors":"Yen Thi Hoang Le ,&nbsp;Jeffrey C.S. Wu ,&nbsp;Wen-Yueh Yu ,&nbsp;Chun-Lin Yeh ,&nbsp;Marjeta Maček Kržmanc","doi":"10.1016/j.ijhydene.2025.04.302","DOIUrl":"10.1016/j.ijhydene.2025.04.302","url":null,"abstract":"<div><div>The production of hydrogen via photocatalytic water splitting presents considerable opportunities for promoting the advancement of renewable energy. We synthesized sheet-liked nanoparticles of g-C<sub>3</sub>N<sub>4</sub>/SrTiO<sub>3</sub> composite exhibited a type II heterojunction for hydrogen production from photocatalytic water splitting reaction. To address the limitation of light absorptivity and enhance the photocatalytic hydrogen evolution rate, noble metals are widely used as cocatalysts even though they are overpriced. Replacing noble metals with earth-abundant metals is indispensable for solar hydrogen's affordable price and up-scale ability. We introduced metallic bismuth decorated in g-C<sub>3</sub>N<sub>4</sub>/SrTiO<sub>3</sub> type II heterojunction by in-situ photoreduction. Under light irradiation, Bi<sup>3+</sup> was reduced to Bi<sup>0</sup> by photogenerated electrons, allowing it to act as a non-noble metal cocatalyst for hydrogen production from photocatalytic whole water splitting under simulated sunlight for the first time. At the optimal amount of bismuth-added (1 mol%), g-C<sub>3</sub>N<sub>4</sub>/SrTiO<sub>3</sub>-based photocatalyst had the most remarkable hydrogen evolution rate, approximately 1800 μmol/g after 5 h under simulated sunlight AM 1.5G, 46-fold higher than the composite catalyst without Bi-decorated. The photocatalytic hydrogen production from deionized water was also conducted, which achieved a noteworthy value of 138.7 μmol/g after 5 h under simulated sunlight. The stability test indicated that 1 %Bi/g-C<sub>3</sub>N<sub>4</sub>/SrTiO<sub>3</sub> could maintain its photocatalytic ability well after four cycles.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 390-401"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876919","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}
引用次数: 0
Hydrogen absorption / desorption behavior in compacted LaNi3·6Mn0·3Al0·4Co0.7 powder
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.272
Sihem Belkhiria , Chaker Briki , Abdelhakim Settar , Abeer M. Beagan , Abdelmajid Jemni
{"title":"Hydrogen absorption / desorption behavior in compacted LaNi3·6Mn0·3Al0·4Co0.7 powder","authors":"Sihem Belkhiria ,&nbsp;Chaker Briki ,&nbsp;Abdelhakim Settar ,&nbsp;Abeer M. Beagan ,&nbsp;Abdelmajid Jemni","doi":"10.1016/j.ijhydene.2025.04.272","DOIUrl":"10.1016/j.ijhydene.2025.04.272","url":null,"abstract":"<div><div>The mechanical behavior of metal hydride powders in storage systems is profoundly influenced by the volumetric changes of individual grains as they expand and contract during reversible hydrogen absorption and desorption. These changes induce mechanical stresses on the storage tank walls. This study examines the expansion and contraction behavior of pellets compacted from LaNi<sub>3</sub><sub>·</sub><sub>6</sub>Mn<sub>0</sub><sub>·</sub><sub>3</sub>Al<sub>0</sub><sub>·</sub><sub>4</sub>Co<sub>0.7</sub> hydride during hydrogen sorption cycles. The experimental investigation focuses on volume evolution, hydrogen storage capacity, temperature effects, and radial deformation of the pellets during absorption and desorption processes. The results reveal that during hydrogenation-dehydrogenation cycles, the compacted LaNi<sub>3</sub><sub>·</sub><sub>6</sub>Mn<sub>0</sub><sub>·</sub><sub>3</sub>Al<sub>0</sub><sub>·</sub><sub>4</sub>Co<sub>0.7</sub> pellet undergoes radial expansion within a stainless steel tank, with a maximum diameter increase of 2.5 % at a pressure of 30 bar and a temperature of 50 °C. Notably, increasing the temperature from 25 °C to 50 °C reduced the hydrogen storage time by 20 %, a result attributed to the alloy's specific reaction kinetics. These insights are crucial for enhancing the design and efficiency of metal hydride-based hydrogen storage systems.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 381-389"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876923","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}
引用次数: 0
Experimental investigation of the dynamics of partially premixed hydrogen flames in a lean direct injection (LDI) combustor
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.150
Chinonso Ezenwajiaku , Ramanarayanan Balachandran , Rojhat Dere , Mark Picciani , Andrea Ducci , Midhat Talibi
{"title":"Experimental investigation of the dynamics of partially premixed hydrogen flames in a lean direct injection (LDI) combustor","authors":"Chinonso Ezenwajiaku ,&nbsp;Ramanarayanan Balachandran ,&nbsp;Rojhat Dere ,&nbsp;Mark Picciani ,&nbsp;Andrea Ducci ,&nbsp;Midhat Talibi","doi":"10.1016/j.ijhydene.2025.04.150","DOIUrl":"10.1016/j.ijhydene.2025.04.150","url":null,"abstract":"<div><div>Lean hydrogen combustion is becoming increasingly popular for energy systems targeting decarbonisation using hydrogen. In this work, the characteristics of a partially premixed flame in a hydrogen lean direct injection (LDI) combustor were investigated. A jet-in-crossflow configuration was used in this combustor, with the hydrogen injected inwards through two diametrically opposite holes positioned on the circumference of a circular air channel. Heat release measurements were obtained with OH* chemiluminescence using, (i) photomultiplier tube (PMT), and (ii) intensified CMOS camera, while pressure measurements were conducted with high-sensitivity dynamic pressure transducers. Effects of bulk velocity and global equivalence ratio (<span><math><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>g</mi><mi>l</mi><mi>o</mi><mi>b</mi><mi>a</mi><mi>l</mi></mrow></msub></math></span>) on flame behaviour and acoustic characteristics were studied. The flame images showed changes in the flame lift-off height and flame length as the <span><math><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>g</mi><mi>l</mi><mi>o</mi><mi>b</mi><mi>a</mi><mi>l</mi></mrow></msub></math></span> was varied from rich to lean conditions. Mixture fraction results showed that an increase in both bulk velocity and <span><math><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>g</mi><mi>l</mi><mi>o</mi><mi>b</mi><mi>a</mi><mi>l</mi></mrow></msub></math></span> improved mixing which was attributed to higher momentum flux ratio. High frequency pressure oscillations were observed at the leaner and richer <span><math><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>g</mi><mi>l</mi><mi>o</mi><mi>b</mi><mi>a</mi><mi>l</mi></mrow></msub></math></span> conditions for 40 m/s and only at leaner conditions for 120 m/s. The heat release oscillations were observed to be coupled to the pressure oscillations for the higher frequency modes of the combustor at 40 m/s and 120 m/s. For both velocities, the largest amplitude of oscillations occurred at the <span><math><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>g</mi><mi>l</mi><mi>o</mi><mi>b</mi><mi>a</mi><mi>l</mi></mrow></msub></math></span> conditions with the lowest average flame length.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"129 ","pages":"Pages 279-290"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876918","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}
引用次数: 0
Effect of high temperature and irradiation on the near-surface microstructure of YHx
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.363
Ying Li , Xuyang Shang , Keke Hou , Yajuan Zhong , Jun Lin
{"title":"Effect of high temperature and irradiation on the near-surface microstructure of YHx","authors":"Ying Li ,&nbsp;Xuyang Shang ,&nbsp;Keke Hou ,&nbsp;Yajuan Zhong ,&nbsp;Jun Lin","doi":"10.1016/j.ijhydene.2025.04.363","DOIUrl":"10.1016/j.ijhydene.2025.04.363","url":null,"abstract":"<div><div>To study the microstructural evolution of Yttrium hydride (YH<sub>x</sub>) under operational conditions, the surface phase transformation, morphology, and microstructure of YH<sub>x</sub> samples fabricated by spark plasma sintering (SPS) were characterized after high-temperature proton irradiation and isochronous annealing. Grazing incidence X-ray diffraction (GIXRD) results showed that yttrium oxide formed in all irradiated and annealed samples. Scanning electron microscope (SEM) observations revealed surface blistering, which is related to the irradiation dose. The near-surface microstructure was further characterized by transmission electron microscopy (TEM), which showed the presence of voids near the surface. Irradiated samples exhibited a higher number density of cavities and a reduction in cavity size compared to the isochronous annealing samples. Temperature and irradiation-induced vacancies were found to contribute to increased hydrogen mobility and hydrogen dissociation, as revealed by density functional theory (DFT). The mechanism underlying the evolution of the near-surface microstructure, including void formation and surface blistering, was thereby elucidated.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 304-312"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876922","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}
引用次数: 0
Hydrogen storage of Mg–3Zn–1Ca-0.5Mn industrial scale magnesium ring processed by hot upsetting and radial axial ring rolling
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.122
H. Vafaeenezhad , B. Nateq , M. Mahmoudi , M. Fesahat , Sh Azizpour
{"title":"Hydrogen storage of Mg–3Zn–1Ca-0.5Mn industrial scale magnesium ring processed by hot upsetting and radial axial ring rolling","authors":"H. Vafaeenezhad ,&nbsp;B. Nateq ,&nbsp;M. Mahmoudi ,&nbsp;M. Fesahat ,&nbsp;Sh Azizpour","doi":"10.1016/j.ijhydene.2025.04.122","DOIUrl":"10.1016/j.ijhydene.2025.04.122","url":null,"abstract":"<div><div>An industrial plastic deformation method involving large strain induction, known as ring rolling (RR), was applied after initial upsetting to produce an ultra-fine-grained Mg ring part with superior hydrogen storage capabilities at industrial scale. The microstructure evolution and hydrogen storage characteristics of the Mg–3Zn–1Ca-0.5Mn alloy (ZX31) were analyzed to establish a correlation between grain structure and hydrogen storage behavior. The enhanced hydrogen storage performance of the ring-rolled material was compared to the upset-only condition using Sievert testing. Results revealed that hydrogen absorption and desorption kinetics are governed by the level of plastic strain and the associated microstructure/substructure modifications induced during processing. Grain refinement achieved through hybrid hot upsetting-ring rolling promoted the formation of effective interfaces, leading to improved hydrogen uptake kinetics. Transmission electron microscopy (TEM) of the severely deformed samples showed the development of dislocation substructures, highlighting their critical role in controlling hydrogen storage performance. Finally, the relationship between hydrogen storage and release kinetics and the microstructure-substructure features was discussed.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 440-451"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876924","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}
引用次数: 0
Study on hydraulic fracturing in natural gas hydrate reservoir based on thermo-hydraulic-mechanical-chemistry coupled damage model and experiment
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.264
Feifei Wang , Zhenqing Wang , Zizhen Wang , Di Zhang
{"title":"Study on hydraulic fracturing in natural gas hydrate reservoir based on thermo-hydraulic-mechanical-chemistry coupled damage model and experiment","authors":"Feifei Wang ,&nbsp;Zhenqing Wang ,&nbsp;Zizhen Wang ,&nbsp;Di Zhang","doi":"10.1016/j.ijhydene.2025.04.264","DOIUrl":"10.1016/j.ijhydene.2025.04.264","url":null,"abstract":"<div><div>Hydraulic fracturing technology is a promising method for reservoir stimulation. The initiation and propagation of hydraulic fractures in gas hydrate reservoirs is a complex multi-physical field coupling process. Firstly, a thermo-hydraulic-mechanical-chemistry (THMC) coupled damage model has been established, the initiation and propagation of micro cracks and fractures are described with the damage variable <em>D</em> and its evolution, and the maximum tensile stress criterion and Mohr-Coulomb criterion are selected as the damage criteria. Then, hydraulic fracturing process in gas hydrate reservoirs are numerically simulated using the THMC coupling damage model to explore the synergistic mechanisms of multi-physical field coupling during fracture initiation and propagation. Finally, artificial samples simulating marine hydrate sediments are prepared for large-scale hydraulic fracturing experiments, and expanded simulations are conducted to examine influence of the key factors on hydraulic fracturing. (i) Validity of the modeling method has been verified with the experiment result. (ii) Hydraulic fractures in marine hydrate sediments has been examined to propagate along the direction of maximum horizontal stress. (iii) A smaller horizontal stress difference, a higher injection rate of fracturing fluid, or a higher fracturing fluid viscosity will accelerate the fracture initiation and propagation. (iv) Increasing the fracturing fluid injection rate have no significant impact on the breakdown pressure. This research provides theoretical guidance and design recommendations for hydraulic fracturing in gas hydrate reservoirs.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 360-372"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876765","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}
引用次数: 0
Impact of temperature and gas composition on hydrogen-based zinc recovery from electric arc furnace dust
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.366
Manuel Leuchtenmüller, Aaron Keuschnig
{"title":"Impact of temperature and gas composition on hydrogen-based zinc recovery from electric arc furnace dust","authors":"Manuel Leuchtenmüller,&nbsp;Aaron Keuschnig","doi":"10.1016/j.ijhydene.2025.04.366","DOIUrl":"10.1016/j.ijhydene.2025.04.366","url":null,"abstract":"<div><div>Steel galvanization, essential for corrosion protection, results in zinc-enriched waste streams during recycling, presenting both environmental challenges and opportunities for resource recovery. Electric arc furnace dust (EAFD), generated at rates of 15–25 kg per ton of recycled steel, contains up to 40 % Zn and represents a significant secondary Zn resource. The current industrial practice relies on the Waelz process, which successfully recovers Zn but fails to recover Fe, generates substantial slag (700 kg per ton EAFD), and emits over 2000 kg CO<sub>2</sub> per ton of recovered Zn.</div><div>Here, we demonstrate that hydrogen-based direct reduction of EAFD enables efficient Zn recovery while significantly reducing environmental impact but requires precise temperature control between 900 and 1200 °C. This research is the first to systematically explore the temperature and gas composition dependencies in hydrogen-based EAFD reduction, offering novel insights into optimizing recovery processes. Through a systematic investigation of reduction kinetics and microstructural evolution, we demonstrate that reaction rates decrease by two orders of magnitude within a narrow 50 °C temperature window due to particle sintering and micro-pore collapse. These findings reveal a critical trade-off between kinetic enhancement and structural degradation.</div><div>The identified mechanisms indicate that optimal reduction requires a precise balance between kinetic acceleration below 1150 °C (showing a five-fold increase in mass loss rates) and the prevention of structural degradation above this critical threshold. Process efficiency is further controlled by reaction-generated H<sub>2</sub>O, creating local thermodynamic barriers that require careful management. These findings establish temperature control as the key parameter for maximizing Zn and Fe recovery efficiency, providing critical guidance for the industrial implementation of hydrogen-based EAFD treatment.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 434-439"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876768","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}
引用次数: 0
NiFe and NiCo core-shell nanoparticles supported on graphene as efficient catalysts for oxygen evolution reaction
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.381
Miriam López García , González-Ingelmo María , Oleg Usoltsev , Freddy E. Oropeza , Janis Timoshenko , Beatriz Roldan Cuenya , Ricardo Santamaría , Clara Blanco , Victoria G. Rocha
{"title":"NiFe and NiCo core-shell nanoparticles supported on graphene as efficient catalysts for oxygen evolution reaction","authors":"Miriam López García ,&nbsp;González-Ingelmo María ,&nbsp;Oleg Usoltsev ,&nbsp;Freddy E. Oropeza ,&nbsp;Janis Timoshenko ,&nbsp;Beatriz Roldan Cuenya ,&nbsp;Ricardo Santamaría ,&nbsp;Clara Blanco ,&nbsp;Victoria G. Rocha","doi":"10.1016/j.ijhydene.2025.04.381","DOIUrl":"10.1016/j.ijhydene.2025.04.381","url":null,"abstract":"<div><div>The development of inexpensive and abundant catalysts for water electrolysis is underway and a wide variety of transition metal-based carbon composites are being explored for the redox reactions involved in the electrochemical cycle of water, being Oxygen Evolution Reaction (OER) the bottleneck of this process. Herein, NiFe and NiCo core-shell nanoparticles supported on graphene 3D aerogels were developed for Oxygen Evolution Reaction. These hybrids were synthesised via freeze-casting method and thermal reduction, enabling an ultra-dispersion of the nanoparticles along the graphene oxide flakes, precise control over the nanoparticle size, and forming an active core-shell structure. The as-processed NiFe and NiCo core-shell nanoparticles consistently maintaining a low metal content of 10 wt% supported on graphene were successfully tested for OER and compared to the current state-of-the-art (NiFe Layered Double Hydroxides), obtaining overpotentials ranging from 400 to 450 mV at 10 mA cm<sup>−2</sup>, a Tafel slope of 84.8 mV dec<sup>−1</sup> and great stability over 12 h.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 313-323"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876777","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}
引用次数: 0
On-board hydrogen-rich syngas production via waste heat recovery from compression-ignition engines: maximizing hydrogen content with novel multi-objective algorithms
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.261
Ümit Ağbulut , Petr Vozka , Hüseyin Bakır , Nathan A. Brieu , Fikret Polat , Suat Sarıdemir
{"title":"On-board hydrogen-rich syngas production via waste heat recovery from compression-ignition engines: maximizing hydrogen content with novel multi-objective algorithms","authors":"Ümit Ağbulut ,&nbsp;Petr Vozka ,&nbsp;Hüseyin Bakır ,&nbsp;Nathan A. Brieu ,&nbsp;Fikret Polat ,&nbsp;Suat Sarıdemir","doi":"10.1016/j.ijhydene.2025.04.261","DOIUrl":"10.1016/j.ijhydene.2025.04.261","url":null,"abstract":"<div><div>A significant portion of fuel energy in internal combustion engines is lost as waste heat, yet limited efforts have been made to recover it effectively. This research explores the utilization of exhaust heat from a diesel engine to produce H<sub>2</sub>-rich syngas through the methanol-steam reforming (MSR) process. The engine operates at varying loads (15, 30, 45, and 60 Nm) while maintaining a constant speed of 2000 rpm. Exhaust heat is redirected to an MSR reactor, where the methanol-to-water (MtW) molar ratio is adjusted (0.5, 1, 1.5, and 2). Results reveal that the highest hydrogen content in syngas (70.3 %) is achieved at an engine load of 30 Nm and an MtW ratio of 1. To further optimize hydrogen production, three novel algorithms (DSC-MOPSO, MOSPO, and MOGWO) are applied to key operation parameters. Optimization increases hydrogen content to 72.5 % with DSC-MOPSO, 72.4 % with MOSPO, and 72.1 % with MOGWO, with error margins below 0.7 %.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 411-422"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876833","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}
引用次数: 0
Degradation behaviour of HVOF sprayed CoNiCrAlY coating in high-temperature ammonia environment towards its applicability in ammonia fueled gas turbines
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-27 DOI: 10.1016/j.ijhydene.2025.04.277
Tina Ghara , Seiji Kuroda , Takashi Yanagisawa , Mohammed Shahien , Masato Suzuki , Takahiro Inoue , Kentaro Shinoda
{"title":"Degradation behaviour of HVOF sprayed CoNiCrAlY coating in high-temperature ammonia environment towards its applicability in ammonia fueled gas turbines","authors":"Tina Ghara ,&nbsp;Seiji Kuroda ,&nbsp;Takashi Yanagisawa ,&nbsp;Mohammed Shahien ,&nbsp;Masato Suzuki ,&nbsp;Takahiro Inoue ,&nbsp;Kentaro Shinoda","doi":"10.1016/j.ijhydene.2025.04.277","DOIUrl":"10.1016/j.ijhydene.2025.04.277","url":null,"abstract":"<div><div>Corrosive nature of ammonia may restrict its widespread application as an alternative carbon-free fuel in gas turbines. Hence, understanding of the ammonia related degradation of thermally sprayed coatings used in the turbine components is essential. This work deals with the degradation behaviour of High-Velocity Oxy-Fuel (HVOF) sprayed CoNiCrAlY coating in ammonia environment at temperatures from 500 °C to 800 °C. The coatings are exposed to 10 % NH<sub>3</sub> gas flow for 4 h. A gradual increase in weight gain of the specimens is identified with the temperature due to diffusion of nitrogen. The two phase (γ-Co,Ni and β-NiAl) structure of the coating near the surface has changed to an internal nitrided layer consisting of CrN/Cr<sub>2</sub>N, AlN, γ-Co/Ni, and β-NiAl phases after the ammonia exposure test, resulting in reduction of the availability of oxide formers such as atomic Cr and Al near the surface. The rise in temperature has led to a linear increase in the thickness of the nitrided layer from around 4.5 μm–9 μm. Stress assisted diffusion of Co and Ni from the nitrided layer to the surface through the diffusional creep mechanisms followed by reaction with the atomic nitrogen at the surface to form Ni<sub>3</sub>N and Co<sub>2</sub>N phases has resulted in the formation of Co/Ni depleted region near the coating surface. The mechanism of degradation and effects of alloying elements are elucidated in detail. Such nitridation of CoNiCrAlY coating may deteriorate its strength and oxidation resistance, necessitating the development of environmental barrier for impeding ammonia corrosion.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 345-359"},"PeriodicalIF":8.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876835","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}
引用次数: 0
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