International Journal of Hydrogen Energy最新文献

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Enhanced high-performance catalyst of α-MoO3/g-C3N4 composite for electrochemical water splitting and photocatalyst application
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.406
G. Vasanthi , T. Prabhuraj , A. Gomathi , K.A. Ramesh Kumar , P. Maadeswaran
{"title":"Enhanced high-performance catalyst of α-MoO3/g-C3N4 composite for electrochemical water splitting and photocatalyst application","authors":"G. Vasanthi ,&nbsp;T. Prabhuraj ,&nbsp;A. Gomathi ,&nbsp;K.A. Ramesh Kumar ,&nbsp;P. Maadeswaran","doi":"10.1016/j.ijhydene.2025.03.406","DOIUrl":"10.1016/j.ijhydene.2025.03.406","url":null,"abstract":"<div><div>One of the active combinations for improving both photo-electrocatalytic performances by using transition metal oxide-based MoO<sub>3</sub> is a good electrocatalyst and carbon-based g-C<sub>3</sub>N<sub>4</sub> is a good photocatalyst material. Moreover, it is essential for energy conversion and environmental applications due to rapid technological developments and the increasing energy crisis. In this study, we synthesize α-MoO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> composite by a one-step facile hydrothermal method. The physical characterizations are the crystalline structure, surface morphology, chemical composition, and optical properties of the catalyst investigated by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Energy dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), UV–Vis absorption spectroscopy, and X-ray photoelectron spectroscopy (XPS) analysis. The photocatalytic degradation efficiency of ∼88 % is 50 mL of 10 mg/L organic rhodamine B dye degraded under visible light irradiation is attained in 70 min with stirring at 300 rpm speed by the 100 mg α-MoO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> composite. Furthermore, we demonstrate the overall hydrogen and oxygen evaluation reaction, that the electrocatalysts were deposited on a nickel foam substrate in an effective 0.5 M Na<sub>2</sub>SO<sub>4</sub> electrolyte solution. These kinetic performances are examined using linear sweep voltammetry, chronoamperometry, chronopotentiometry, and electrochemical impedance spectroscopy analysis. The results showed that the α-MoO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> composite had a low overpotential of 187.6 mV and 139.3 mV, as well as a small Tafel slope of 126.2 mV/dec and 120.2 mV/dec for OER and HER, compared to bare α-MoO<sub>3</sub> and g-C<sub>3</sub>N<sub>4</sub> catalysts, attained the 10 mA cm<sup>−2</sup> current density for 12 h of stability.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"123 ","pages":"Pages 265-280"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759246","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
Tree-like hierarchical porous anode catalyst layer for efficient proton exchange membrane water electrolyzer by optimization of transportation
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.411
Zhuo-xin Lu , Qi Bao , Shuai-kui Wu , Yan Shi , Tauseef Munawar , Bin Chen , Jia-mei Mo , Hong-yi Tan , Zhi-da Wang , Chang-qing Guo , Mohammad Zhiani , Chang-feng Yan
{"title":"Tree-like hierarchical porous anode catalyst layer for efficient proton exchange membrane water electrolyzer by optimization of transportation","authors":"Zhuo-xin Lu ,&nbsp;Qi Bao ,&nbsp;Shuai-kui Wu ,&nbsp;Yan Shi ,&nbsp;Tauseef Munawar ,&nbsp;Bin Chen ,&nbsp;Jia-mei Mo ,&nbsp;Hong-yi Tan ,&nbsp;Zhi-da Wang ,&nbsp;Chang-qing Guo ,&nbsp;Mohammad Zhiani ,&nbsp;Chang-feng Yan","doi":"10.1016/j.ijhydene.2025.03.411","DOIUrl":"10.1016/j.ijhydene.2025.03.411","url":null,"abstract":"<div><div>The microstructure of the catalyst layer (CL) is a key factor in constructing an effective triple-phase boundaries for the activity presentation of membrane electrode assembly for proton exchange membrane (PEM) water electrolysis. In this work, with TiO<sub>2</sub> nanotube arrays and leached Ni as a template, an IrNiO<sub>x</sub> catalyst layer with tree-like hierarchical pores (TLHP-CL) is developed to achieve full utilization of Iridium. For TLHP-CL structure, the vertically oriented mesopores provide facile mass transport pathways, while the ionomer-free nanopores in the IrNiO<sub>x</sub> sphere provide abundant active sites and hydrophilicity that facilitate active site accessibility. TLHP-CL23 shows 1.63 times enhancement compared to IrO<sub>x</sub> nanoarrays (NAs) CL with similar intrinsic activity in the half-cell study. A prominent single-cell voltage of 1.666 V at 1 A cm<sup>−2</sup> and 1.787 V at 2 A cm<sup>−2</sup> for TLHP-CL23 is achieved. Polarization breakdown shows that with a current density under 2 A cm<sup>−2</sup>, the mass transfer overpotential of TLHP-CL23 is negligible, but it increases rapidly when the applied current density is higher than 2.5 A cm<sup>−2</sup>, showing the mass transfer limitation of nanopores. Also, prominent stability is presented with no significant degradation after 700 h operation under 1.5 A cm<sup>−2</sup>.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"123 ","pages":"Pages 231-237"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759321","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
Modeling adsorption-based hydrogen storage in nanoporous activated carbon beds at moderate temperature and pressure
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.373
Lijin Chen , Valeska P. Ting , Yuxuan Zhang , Shuai Deng , Shuangjun Li , Zhenyuan Yin , Fei Wang , Xiaolin Wang
{"title":"Modeling adsorption-based hydrogen storage in nanoporous activated carbon beds at moderate temperature and pressure","authors":"Lijin Chen ,&nbsp;Valeska P. Ting ,&nbsp;Yuxuan Zhang ,&nbsp;Shuai Deng ,&nbsp;Shuangjun Li ,&nbsp;Zhenyuan Yin ,&nbsp;Fei Wang ,&nbsp;Xiaolin Wang","doi":"10.1016/j.ijhydene.2025.03.373","DOIUrl":"10.1016/j.ijhydene.2025.03.373","url":null,"abstract":"<div><div>This study explores the enhancement of hydrogen storage efficiency in four nanoporous activated carbon using a self-developed adsorption model. Results reveal that, at the macroscopic level, decreasing the temperature, and increasing the pressure, velocity, and bed porosity significantly enhance hydrogen adsorption capacity. At the microscopic level, material properties, including micropore and mesopore volumes and specific surface area are critical for influencing the hydrogen storage capacity. The findings indicate that increasing the micropore-to-total pore volume ratio (from 0.8392 to 0.886) and surface area (from 958 to 2280 m<sup>2</sup>/g) enhances storage efficiency (from 1.2 to 1.9 wt%) at 298 K, 9 MPa. Notably, AC-800 demonstrates superior hydrogen storage capacity (1.9 wt%) due to its well-developed micropores (0.94 cm<sup>3</sup>/g) enabling efficient H<sub>2</sub> adsorption, and its moderate mesopores (0.12 cm<sup>3</sup>/g) providing storage capacity and facilitating compression. This work underscores the need to optimize macro and micro-scale parameters to maximize hydrogen storage in activated carbon beds.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"122 ","pages":"Pages 159-179"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Techno-economic analysis and optimization of agrivoltaic systems for green hydrogen production in diverse climates
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.434
Sina Sadeghi Chamazkoti, Ahmad Hajinezhad, Seyed Farhan Moosavian
{"title":"Techno-economic analysis and optimization of agrivoltaic systems for green hydrogen production in diverse climates","authors":"Sina Sadeghi Chamazkoti,&nbsp;Ahmad Hajinezhad,&nbsp;Seyed Farhan Moosavian","doi":"10.1016/j.ijhydene.2025.03.434","DOIUrl":"10.1016/j.ijhydene.2025.03.434","url":null,"abstract":"<div><div>This study investigates the techno-economic feasibility of green hydrogen production with a PEM electrolyzer integrated with agrivoltaics (APV) across four sites representing Iran's main climatic regions: Behshahr (mild and humid), Zanjan (cold), Isfahan (warm and dry), and Bushehr (warm and humid). Three agrivoltaic configurations—fixed, mono-axial, and vertical—were evaluated, each with three different row spacings (pitches). PVsyst was employed for solar energy generation modeling and shading analysis, AquaCrop was utilized to assess water efficiency and irrigation requirements, and the AgriPV tool was used for crop yield simulation. HOMER Pro simulated the overall system performance, including hydrogen production and economic analysis. The energy generated was allocated to meet water pumping requirements for irrigation, with the remaining energy directed toward hydrogen production. The levelized cost of hydrogen (LCOH) across scenarios ranged from $2.92 to $6.69 per kilogram. The optimal scenario, identified through a multi-criteria decision-making (MCDM) approach, features a fixed agrivoltaic system with a 5-m pitch in Isfahan. Assuming a hydrogen selling price of $4 per kilogram, this 20-year project achieves a payback period of 12 years and a net present value (NPV) of $814,000. Compared to conventional practices, the optimal scenario achieved a 27 % decrease in total tomato crop yield while reducing total water consumption by 40 %. Notably, it demonstrated significant improvements in both energy and agricultural efficiency, as reflected by a land equivalent ratio (LER) of 1.63. Although the cost of hydrogen production was 3 % higher than that of a standard solar hydrogen facility, the agrivoltaic system outperformed in resource efficiency and land productivity, underscoring its potential as a sustainable and integrated solution.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"123 ","pages":"Pages 247-264"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759319","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
Interplay between renewable energy factor and levelized costs in PV-driven buildings using hydrogen fuel cell system as an energy storage solution
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.263
Aminhossein Jahanbin, Umberto Berardi
{"title":"Interplay between renewable energy factor and levelized costs in PV-driven buildings using hydrogen fuel cell system as an energy storage solution","authors":"Aminhossein Jahanbin,&nbsp;Umberto Berardi","doi":"10.1016/j.ijhydene.2025.03.263","DOIUrl":"10.1016/j.ijhydene.2025.03.263","url":null,"abstract":"<div><div>This study introduces an effective analysis framework for exploring the complex interrelation between the renewable energy factor (REF) and the economic dimensions of a PV-driven microgrid featuring a dual-level storage system that incorporates both hydrogen and electrical energy storage. By establishing a coupled model that integrates dynamic simulations with a statistical multi-objective optimization algorithm, the research aims to achieve optimal component sizing—a critical step in assessing the hybrid system across various REF levels—while effectively reducing the levelized cost of electricity (LCOE). Using the analysis outcomes of a case study, a comprehensive techno-economic assessment facilitates a nuanced evaluation of the interplay between the REF, system economics across various equipment cost quartiles, and grid tariffs, addressing the feasibility of the proposed solution for a sustainable energy transition. The results highlight how grid tariffs and REF jointly influence LCOE values across cost quartiles, impacting hybrid system design and decision-making. An exponential correlation is observed between life cycle cost (LCC) and REF, with the increase in annual operating costs being marginal compared to the initial cost rise. For the net-zero energy case, the LCOE ranges from 0.0380 to 0.1873 $/kWh, while at REF = 0.6, it spans from 0.0461 to 0.1334 $/kWh, reflecting a 71 % larger difference (range). A sensitivity analysis indicates that each 5 % increase in REF leads to an average 20.7 % rise in payback period (PBP) for a given grid tariff.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"122 ","pages":""},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Future of hydrogen energy: The role of environmental policy and political globalization
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.349
Sana Ullah , Sidra Sohail , Muhammad Tariq Majeed , Muhammad Tayyab Sohail
{"title":"Future of hydrogen energy: The role of environmental policy and political globalization","authors":"Sana Ullah ,&nbsp;Sidra Sohail ,&nbsp;Muhammad Tariq Majeed ,&nbsp;Muhammad Tayyab Sohail","doi":"10.1016/j.ijhydene.2025.03.349","DOIUrl":"10.1016/j.ijhydene.2025.03.349","url":null,"abstract":"<div><div>Alternative and carbon-free energy sources are widely recognized as drivers of clean and green ecosystems and sustainable development. Hydrogen energy is gaining popularity as a carbon-free energy source and can replace fossil fuel-based energy sources. Therefore, it is important to estimate the determinants of hydrogen energy. This analysis aims to investigate the effects of environmental policy stringency and political globalization on hydrogen energy in the top seven hydrogen-innovating economies using the CS-ARDL methodology. The long-run results indicate that stringent environmental policies and political globalization positively impact hydrogen energy technology. In contrast, in the short run, only the environmental policy fosters hydrogen technology, whereas the other factors do not exert a significant influence on hydrogen energy technology. In the long run, a 1 % rise in the environmental policy stringency enhances the production of hydrogen-related technologies by 0.212 %, while in the short run, the hydrogen energy technologies improve by 0.20 %. The rise in political globalization by 1 % leads to enhanced development of hydrogen energy by 1.825 %. However, in the short run, we did not find any noticeable influence of political globalization on hydrogen energy. Similarly, with the 1 % rise in economic growth and financial development, hydrogen technology improves by 0.121 % and 2.342 %, in the long-run. Given the positive influence of environmental policy and political globalization on hydrogen energy, the study suggests that policymakers need to design strict environmental policies and encourage international collaboration to develop hydrogen technology.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"122 ","pages":""},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759386","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
Combustion and emission characteristics of RCCI engine fueled with hydrogen and karanja biodiesel renewable fuels
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.409
S.P. Wategave , N.R. Banapurmath , K.S. Nivedhitha , Ashok M. Sajjan , M.S. Sawant , IrfanAnjum Badruddin , Sarfaraz Kamangar , R.S. Hosmath
{"title":"Combustion and emission characteristics of RCCI engine fueled with hydrogen and karanja biodiesel renewable fuels","authors":"S.P. Wategave ,&nbsp;N.R. Banapurmath ,&nbsp;K.S. Nivedhitha ,&nbsp;Ashok M. Sajjan ,&nbsp;M.S. Sawant ,&nbsp;IrfanAnjum Badruddin ,&nbsp;Sarfaraz Kamangar ,&nbsp;R.S. Hosmath","doi":"10.1016/j.ijhydene.2025.03.409","DOIUrl":"10.1016/j.ijhydene.2025.03.409","url":null,"abstract":"<div><div>In a diesel engine, heterogeneous combustion is more harmful, noisy, and uncontrollable. Reactivity-controlled compression ignition mode engines that run on low and high reactive fuel combinations are a smart way to deal with this. The current work modifies a diesel engine to run on gaseous fuels in reactivity controlled combustion ignition (RCCI) engine mode, namely. The main fuels are hydrogen enriched CNG (HCNG) and hydrogen (H<sub>2</sub>), while the pilot fuel is a mixture of diesel and Karanja biodiesel (BD20). Determining the operational limitations of HCNG and H<sub>2</sub> fuels for cleaner emissions and quieter combustion is the goal of this study. Additionally, for full load operation, the relative air-fuel ratio (λ), cycle-to-cycle fluctuations, emissions, and combustion noise were examined. With a split injection approach, the common rail direct injection (CRDI) engine is tuned for diesel operation. The knock limitations for the major fuels, HCNG and H<sub>2</sub>, are determined. At injector open time (IOT) 8 ms of LRF, the maximum in-cylinder pressures for HCNG and H<sub>2</sub> are 72 and 76 bar, respectively. Heat release rates of 86 and 87.9 J/deg, respectively, ES75 % and 22 % of LRF HCNG and H<sub>2</sub> were obtained. Using the RCCI mode of a modified diesel engine, an optimal of 75–80 % and 30–40 % ES of HCNG and H<sub>2</sub> LRFs is noted for clean combustion and emissions strategy. At optimum performance HC emissions of 42 and 138 ppm for H<sub>2</sub> and HCNG LRFs respectively were observed. At higher ES of LRF, lower CO emissions of 0.04 and 0.02 % are obtained.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"123 ","pages":"Pages 184-193"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759153","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
Proton conducting Zn-doped BaZr0.1Ce0.7Y0.1Zn0.1O3−δ electrolyte with enhanced ionic conductivity for durable CH4 fueled solid oxide fuel cells
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.365
Jialu Wei, Fanghui Mi, Wei Zhang, Chunwen Sun
{"title":"Proton conducting Zn-doped BaZr0.1Ce0.7Y0.1Zn0.1O3−δ electrolyte with enhanced ionic conductivity for durable CH4 fueled solid oxide fuel cells","authors":"Jialu Wei,&nbsp;Fanghui Mi,&nbsp;Wei Zhang,&nbsp;Chunwen Sun","doi":"10.1016/j.ijhydene.2025.03.365","DOIUrl":"10.1016/j.ijhydene.2025.03.365","url":null,"abstract":"<div><div>BaCeO<sub>3</sub>-based proton conductors exhibit high ionic conductivity but suffer from poor chemical stability and high sintering temperatures, limiting their application in protonic ceramic fuel cells (PCFCs). This study demonstrates that Zn doping in BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.2</sub>O<sub>3−δ</sub> (BZCY) enhances both chemical stability and ionic conductivity. BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Zn<sub>0.1</sub>O<sub>3−δ</sub> (BZCYZn) achieves higher proton conductivities of 0.022 S cm<sup>−1</sup> in humid H<sub>2</sub> and 0.019 S cm<sup>−1</sup> in CH<sub>4</sub> at 750 °C, surpassing those of BZCY. Zn doping improves conductivity in both the bulk and grain boundaries. An anode-supported single cell using BZCYZn as the electrolyte delivers peak power densities of 1324.63 mW cm<sup>−2</sup> in H<sub>2</sub> and 647.49 mW cm<sup>−2</sup> in CH<sub>4</sub>, significantly outperforming BZCY. The electrochemical performance and mass transport properties of BZCYZn are further analyzed using distribution of relaxation times (DRT) analysis.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"122 ","pages":"Pages 180-191"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760025","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
Investigate the frequency and intensity of knock zone in hydrogen engine under different operating conditions through experimentation and machine learning method
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.393
Nguyen Xuan Khoa, Chu Duc Hung, Nguyen Thanh Vinh, Le Huu Chuc, Ta Duc Quyet, Nguyen Tuan Nghia
{"title":"Investigate the frequency and intensity of knock zone in hydrogen engine under different operating conditions through experimentation and machine learning method","authors":"Nguyen Xuan Khoa,&nbsp;Chu Duc Hung,&nbsp;Nguyen Thanh Vinh,&nbsp;Le Huu Chuc,&nbsp;Ta Duc Quyet,&nbsp;Nguyen Tuan Nghia","doi":"10.1016/j.ijhydene.2025.03.393","DOIUrl":"10.1016/j.ijhydene.2025.03.393","url":null,"abstract":"<div><div>This study focuses on determining the Knock Index (KI) to analyze the frequency and intensity of engine knocking. Additionally, it provides solutions for optimizing working conditions to limit the occurrence of knocking. The research employs the Gradient Boosting Regressor (GBR) algorithm model and data collected from experiments, using the following input parameters: engine speed, injection timing, and injection pressure. A GBR-based Knock Index prediction model has been successfully developed, achieving high accuracy with: Coefficient of Determination (R<sup>2</sup>) = 0.993, Mean Absolute Error (MAE) = 10.447, Root Mean Square Error (RMSE) = 13.506. The model has been used to investigate the influence of input parameters on the likelihood of knocking. The results indicate that the knocking phenomenon occurs with high frequency and intensity when the engine operates under the following conditions: engine speed less than 1000 rounds per minute (rpm), ignition advance angle of −15 to −25° (deg) After Top Dead Center (ATDC), and fuel injection timing between −80 and −90 deg ATDC and −100 to −150 deg ATDC. Furthermore, the research shows that the maximum KI reaches 750 (indicative of super knocking) under specific conditions: an engine speed of 600 rpm, ignition advance angle of −20 deg ATDC, low injection pressure, and a fuel injection angle of 110 deg ATDC.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"123 ","pages":"Pages 173-183"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759152","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 engineering in PHE-graphene monolayer via potassium (K) decoration
IF 8.1 2区 工程技术
International Journal of Hydrogen Energy Pub Date : 2025-04-03 DOI: 10.1016/j.ijhydene.2025.03.288
José A.S. Laranjeira , Nicolas F. Martins , Lingyu Ye , Julio R. Sambrano , Xihao Chen
{"title":"Hydrogen storage engineering in PHE-graphene monolayer via potassium (K) decoration","authors":"José A.S. Laranjeira ,&nbsp;Nicolas F. Martins ,&nbsp;Lingyu Ye ,&nbsp;Julio R. Sambrano ,&nbsp;Xihao Chen","doi":"10.1016/j.ijhydene.2025.03.288","DOIUrl":"10.1016/j.ijhydene.2025.03.288","url":null,"abstract":"<div><div>The increasing demand for ecofriendly and efficient energy sources accelerates the transition from fossil fuels to hydrogen (H<sub>2</sub>), which requires advances in production, transportation, and storage technologies. This study investigates the functionalization of PHE-graphene via potassium (K) decoration. A comprehensive analysis of the K@PHE-graphene system revealed a transition from metallic to semiconductor character due to charge transfer from K adatoms (+0.89<span><math><mrow><mo>|</mo><mi>e</mi><mo>|</mo></mrow></math></span>). Molecular dynamics simulations confirmed the retention of K atoms at their preferred adsorption sites, ensuring the structural integrity of the substrate. K@PHE-graphene complex has an exceptional adsorption capacity of 7.47 wt%, exceeding the DOE target of 5.5 wt%. Thermodynamic analysis also highlighted an optimal storage conditions, achieving maximum capacity between 100-150 K at low pressures (0–20 atm) and maintaining efficiency at higher pressures (40–60 atm) even at elevated temperatures. These findings establish K@PHE-graphene as a promising candidate for reversible hydrogen storage applications.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"123 ","pages":"Pages 139-149"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759150","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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