Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.452
Mengjie Cao , Shuangde Li , Shikun Wang , Weichen Xu , Xin Zhou , Guangxin Ma , Linfeng Nie , Yunfa Chen
Methane cracking is an efficient and clean method of producing hydrogen. Currently, designing high-performance methane cracking catalysts has become a research hotspot. In this paper, Ni2·7Fe0·3Al, Ni2·7Cr0·3Al and Ni2·7V0·3Al catalysts were obtained by reducing hydrotalcite precursors, and the effects of Fe, Cr and V doping on the methane cracking performance of hydrotalcite-derived NiAl catalysts were investigated. Comparative studies showed that the doping of V and Cr significantly improved the catalytic performance. Especially, the presence of Cr increased the specific surface area of the catalysts, promoted the reduction of Ni species and inhibited the sintering of metals during the reaction, exhibiting optimal catalytic performance. The Ni2·7Cr0·3Al catalyst was stabilized with 75% hydrogen yield over 250 min at 650 °C. In addition, Ni3Al catalysts start reacting with methane at 300 °C, while Ni2·7Cr0·3Al catalyst showed a higher onset temperature than Ni3Al catalyst. There was an induction period between 300 °C and 400 °C, and the H2 yield increased linearly with the temperature after 400 °C. The doping of V and Cr significantly altered the morphology of the deposited carbon, allowing carbon nanotubes to replace carbon particles as the main product.
{"title":"Influence of fe, Cr and V doping on the methane cracking performance of hydrotalcite-derived NiAl catalysts","authors":"Mengjie Cao , Shuangde Li , Shikun Wang , Weichen Xu , Xin Zhou , Guangxin Ma , Linfeng Nie , Yunfa Chen","doi":"10.1016/j.ijhydene.2025.02.452","DOIUrl":"10.1016/j.ijhydene.2025.02.452","url":null,"abstract":"<div><div>Methane cracking is an efficient and clean method of producing hydrogen. Currently, designing high-performance methane cracking catalysts has become a research hotspot. In this paper, Ni<sub>2·7</sub>Fe<sub>0·3</sub>Al, Ni<sub>2·7</sub>Cr<sub>0·3</sub>Al and Ni<sub>2·7</sub>V<sub>0·3</sub>Al catalysts were obtained by reducing hydrotalcite precursors, and the effects of Fe, Cr and V doping on the methane cracking performance of hydrotalcite-derived NiAl catalysts were investigated. Comparative studies showed that the doping of V and Cr significantly improved the catalytic performance. Especially, the presence of Cr increased the specific surface area of the catalysts, promoted the reduction of Ni species and inhibited the sintering of metals during the reaction, exhibiting optimal catalytic performance. The Ni<sub>2·7</sub>Cr<sub>0·3</sub>Al catalyst was stabilized with 75% hydrogen yield over 250 min at 650 °C. In addition, Ni<sub>3</sub>Al catalysts start reacting with methane at 300 °C, while Ni<sub>2·7</sub>Cr<sub>0·3</sub>Al catalyst showed a higher onset temperature than Ni<sub>3</sub>Al catalyst. There was an induction period between 300 °C and 400 °C, and the H<sub>2</sub> yield increased linearly with the temperature after 400 °C. The doping of V and Cr significantly altered the morphology of the deposited carbon, allowing carbon nanotubes to replace carbon particles as the main product.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 366-375"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551557","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.310
Jia Li , Xue-wei Wang , Jia-qian Niu , Shi-qi Li , Cai-wen Guo , Zi-xin Qiu , Shuang Gao
Efficient and stable electrocatalysts are crucial for efficient hydrogen energy production. The rapid detachment of bubbles is an important factor influencing continuous and efficient catalysis. In this study, a unique three-dimensional porous structure was constructed by electrodeposition method to avoid the influence of bubble adhesion on the catalyst. High entropy alloys (HEAs) with porous structures are rich in active sites and thus have excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performances. By controlling the deposition current and time, the microstructure of the HEA presents a feather-like shape, with strong hydrophilicity and rapid bubble release behavior, exposing more active sites and facilitating bubble convergence. The porous structure HEAs provide gas transport channels, creating favorable conditions for rapid bubble detachment. The prepared FeCoNiCuMn HEAs exhibit the overpotentials of 251 mV for the OER and 200 mV for the HER at a current density of 100 mA cm−2 in an alkaline solution, and the corresponding Tafel slopes are 47.93 mV dec−1 and 40.42 mV dec−1, respectively. As the cathode and anode of the electrolyzer, it could achieve a current density of 100 mA cm−2 with a voltage of only 1.75 V. Furthermore, the HEAs show good stability with almost no loss of activity after long-term cycling of 30 h. These results strongly suggest that the rapid detachment of bubbles is contributing to the performance of electrolyzed water. This study provides a feasible approach to enhance the electrocatalytic efficiency and address the bubble detachment issue in the water electrolysis process.
{"title":"Enhancement of electrocatalytic efficiency by rapid bubble detachment at electrodeposited feather-like FeCoNiCuMn high-entropy alloy porous structure","authors":"Jia Li , Xue-wei Wang , Jia-qian Niu , Shi-qi Li , Cai-wen Guo , Zi-xin Qiu , Shuang Gao","doi":"10.1016/j.ijhydene.2025.02.310","DOIUrl":"10.1016/j.ijhydene.2025.02.310","url":null,"abstract":"<div><div>Efficient and stable electrocatalysts are crucial for efficient hydrogen energy production. The rapid detachment of bubbles is an important factor influencing continuous and efficient catalysis. In this study, a unique three-dimensional porous structure was constructed by electrodeposition method to avoid the influence of bubble adhesion on the catalyst. High entropy alloys (HEAs) with porous structures are rich in active sites and thus have excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performances. By controlling the deposition current and time, the microstructure of the HEA presents a feather-like shape, with strong hydrophilicity and rapid bubble release behavior, exposing more active sites and facilitating bubble convergence. The porous structure HEAs provide gas transport channels, creating favorable conditions for rapid bubble detachment. The prepared FeCoNiCuMn HEAs exhibit the overpotentials of 251 mV for the OER and 200 mV for the HER at a current density of 100 mA cm<sup>−2</sup> in an alkaline solution, and the corresponding Tafel slopes are 47.93 mV dec<sup>−1</sup> and 40.42 mV dec<sup>−1</sup>, respectively. As the cathode and anode of the electrolyzer, it could achieve a current density of 100 mA cm<sup>−2</sup> with a voltage of only 1.75 V. Furthermore, the HEAs show good stability with almost no loss of activity after long-term cycling of 30 h. These results strongly suggest that the rapid detachment of bubbles is contributing to the performance of electrolyzed water. This study provides a feasible approach to enhance the electrocatalytic efficiency and address the bubble detachment issue in the water electrolysis process.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 385-394"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552505","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.235
Mohammadali Zoljalali, Richard Ahorsu, Francesc Díaz, Magdalena Aguiló, Xavier Mateos
This study focuses on the fabrication of a membraneless electrolyzer using the Tesla valve concept. The designed electrolyzer by utilizing the fluidic forces and tesla valves concept separate the produced H2 and O2 without using a membrane. Elimination of the membrane contributes to increasing the flexibility of the working condition for the electrolyzers and decreases fabrication costs. Tesla valve membranelss electrolyzers can operate at a flow rate of 30 mL h−1 and a current density of 300 mA cm−2. This pumping power is the lowest required pumping power for the reported current density in the literature of membraneles electrolyzers. Furthermore, by increasing the flow rate to 80 mL h−1, this structure works at up to 600 mA cm−2. Additionally, this study demonstrates that by leveraging the diodicity of the Tesla valve and changing the placement of the anode and cathode, the hydrogen production frequency can be increased by an average of 13%.
{"title":"Membraneless electrolyzer designed using the tesla valve concept for hydrogen production","authors":"Mohammadali Zoljalali, Richard Ahorsu, Francesc Díaz, Magdalena Aguiló, Xavier Mateos","doi":"10.1016/j.ijhydene.2025.02.235","DOIUrl":"10.1016/j.ijhydene.2025.02.235","url":null,"abstract":"<div><div>This study focuses on the fabrication of a membraneless electrolyzer using the Tesla valve concept. The designed electrolyzer by utilizing the fluidic forces and tesla valves concept separate the produced H<sub>2</sub> and O<sub>2</sub> without using a membrane. Elimination of the membrane contributes to increasing the flexibility of the working condition for the electrolyzers and decreases fabrication costs. Tesla valve membranelss electrolyzers can operate at a flow rate of 30 mL h<sup>−1</sup> and a current density of 300 mA cm<sup>−2</sup>. This pumping power is the lowest required pumping power for the reported current density in the literature of membraneles electrolyzers. Furthermore, by increasing the flow rate to 80 mL h<sup>−1</sup>, this structure works at up to 600 mA cm<sup>−2</sup>. Additionally, this study demonstrates that by leveraging the diodicity of the Tesla valve and changing the placement of the anode and cathode, the hydrogen production frequency can be increased by an average of 13%.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 535-549"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552194","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}
The problem of absorption of new energy, such as wind and solar power, into the power system is becoming increasingly serious. How to improve the economic benefits of hydrogen energy system while using it to help the absorption of new energy is a practical problem that needs to be addressed in the development of hydrogen-electric coupling. The paper proposes a method for optimizing the capacity of a hydrogen energy system through the cooperative operation of alkaline electrolyzers and proton exchange membrane electrolyzers. First, a wind-solar-hydrogen energy system is constructed, and the mechanisms of each component are analyzed. Second, considering the operational characteristics of the electrolyzer, a power distribution strategy for the hybrid electrolyzers is proposed. Subsequently, the optimal configuration model of wind-solar-hydrogen energy system is established with the maximum profit of the system as the optimization objective. Finally, an industrial park system in northwest China is taken as an example to verify the feasibility of the optimal configuration method. The results indicate that the coordinated operation of alkaline electrolyzers and proton exchange membrane electrolyzers significantly enhances the absorption of wind-solar power in the power system, demonstrating promising application potential.
{"title":"Optimal configuration method of hydrogen energy system for coordinated operation of multi-type electrolyzers for new energy consumption","authors":"Xie Jinyong, Zhang Yi, Xiang Mengru, Zhang Minghui","doi":"10.1016/j.ijhydene.2025.02.438","DOIUrl":"10.1016/j.ijhydene.2025.02.438","url":null,"abstract":"<div><div>The problem of absorption of new energy, such as wind and solar power, into the power system is becoming increasingly serious. How to improve the economic benefits of hydrogen energy system while using it to help the absorption of new energy is a practical problem that needs to be addressed in the development of hydrogen-electric coupling. The paper proposes a method for optimizing the capacity of a hydrogen energy system through the cooperative operation of alkaline electrolyzers and proton exchange membrane electrolyzers. First, a wind-solar-hydrogen energy system is constructed, and the mechanisms of each component are analyzed. Second, considering the operational characteristics of the electrolyzer, a power distribution strategy for the hybrid electrolyzers is proposed. Subsequently, the optimal configuration model of wind-solar-hydrogen energy system is established with the maximum profit of the system as the optimization objective. Finally, an industrial park system in northwest China is taken as an example to verify the feasibility of the optimal configuration method. The results indicate that the coordinated operation of alkaline electrolyzers and proton exchange membrane electrolyzers significantly enhances the absorption of wind-solar power in the power system, demonstrating promising application potential.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 564-574"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552199","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.03.021
Xianghui Liu , Pinghui Lin , Jiaqi Qian , Haipeng Zhang , Na Ai , Chengzhi Guan , Xin Wang , Yanqun Shao , San Ping Jiang , Kongfa Chen
The adoption of oxide precursor substrate can simplify the preparation process and reduce the cost of metal-supported solid oxide fuel cells (MS-SOFCs). However, the drastic shrinkage of oxide substrate during reduction can cause structural damage of MS-SOFCs. Herein, yttria-stabilized zirconia (YSZ) is incorporated to tailor the physical properties of NiFe substrate and structural stability of MS-SOFCs. The results show that the incorporation of YSZ phase leads to significantly suppressed sintering and grain growth during high temperature sintering and reduction processes as well as mitigated shrinkage of substrate and improved flatness of single cell during reduction process. The incorporation of YSZ phase also significantly enhances the mechanical strength and maintains acceptable electrical conductivity of the substrate. The single cell with the incorporation of 15 wt% YSZ phase into the NiFe substrate produces a peak power density of 1.02 W cm−2 at 750 °C with no noticeable degradation during the galvanostatic test at 650 °C for 100 h. The present work provides a new strategy for the development of a NiFe metal substrate for robust MS-SOFCs.
{"title":"Modulating the structural stability of NiFe metal-supported solid oxide fuel cells","authors":"Xianghui Liu , Pinghui Lin , Jiaqi Qian , Haipeng Zhang , Na Ai , Chengzhi Guan , Xin Wang , Yanqun Shao , San Ping Jiang , Kongfa Chen","doi":"10.1016/j.ijhydene.2025.03.021","DOIUrl":"10.1016/j.ijhydene.2025.03.021","url":null,"abstract":"<div><div>The adoption of oxide precursor substrate can simplify the preparation process and reduce the cost of metal-supported solid oxide fuel cells (MS-SOFCs). However, the drastic shrinkage of oxide substrate during reduction can cause structural damage of MS-SOFCs. Herein, yttria-stabilized zirconia (YSZ) is incorporated to tailor the physical properties of NiFe substrate and structural stability of MS-SOFCs. The results show that the incorporation of YSZ phase leads to significantly suppressed sintering and grain growth during high temperature sintering and reduction processes as well as mitigated shrinkage of substrate and improved flatness of single cell during reduction process. The incorporation of YSZ phase also significantly enhances the mechanical strength and maintains acceptable electrical conductivity of the substrate. The single cell with the incorporation of 15 wt% YSZ phase into the NiFe substrate produces a peak power density of 1.02 W cm<sup>−2</sup> at 750 °C with no noticeable degradation during the galvanostatic test at 650 °C for 100 h. The present work provides a new strategy for the development of a NiFe metal substrate for robust MS-SOFCs.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"114 ","pages":"Pages 1-8"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547872","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.482
Jinghong Wang , Bo Chen , Qingzhao Li , Hongcheng Lu , Jialin Wu , Juncheng Jiang , Zhe Yang
To explore the effects and underlying mechanisms of C6F12O and CO2 on the explosion suppression of hydrogen compressed natural gas(HCNG), this study investigates its deflagration characteristics under various hydrogen concentrations (0–30%) and equivalence ratios ( = 0.6–1.4) by using CHEMKIN. A suppression mechanism for C6F12O to HCNG combustion, consisting of 222 species and 1744 reactions is proposed. Findings show that, C6F12O outperforms CO2 in flame suppression, demonstrating 2.25 times greater flame thickness inhibition, 5 times reduction in laminar burning velocity, 6.57 times lower adiabatic flame temperature, and 5 times more effectiveness in reducing heat release rate. Further analysis demonstrated that the adiabatic flame temperature linearly correlated with the volume fractions of C6F12O and CO2. Furthermore, the flame thickness, laminar burning velocity, maximum heat release rate, adiabatic flame temperature, sensitivity factors, and molar fractions of reactive radicals decreased with increasing the proportion of C6F12O and CO2. The results show that CO2 primarily acts through physical dilution, whereas C6F12O dominates through chemical suppression, as free radicals are captured by fluorides. The C6F12O's major suppression reactions are: R830:CFO + HCO + HF, R833:CF3+OCF2O + F, and R925:CF2+OHCF:O + HF. Findings will provide new insights for the prevention of HCNG explosions and reduce hazardous effects.
{"title":"Inhibition effect and kinetics studies on the deflagration characteristics of hydrogen compressed natural gas (HCNG) by C6F12O and CO2","authors":"Jinghong Wang , Bo Chen , Qingzhao Li , Hongcheng Lu , Jialin Wu , Juncheng Jiang , Zhe Yang","doi":"10.1016/j.ijhydene.2025.02.482","DOIUrl":"10.1016/j.ijhydene.2025.02.482","url":null,"abstract":"<div><div>To explore the effects and underlying mechanisms of C<sub>6</sub>F<sub>12</sub>O and CO<sub>2</sub> on the explosion suppression of hydrogen compressed natural gas(HCNG), this study investigates its deflagration characteristics under various hydrogen concentrations (0–30%) and equivalence ratios (<span><math><mrow><mi>φ</mi></mrow></math></span> = 0.6–1.4) by using CHEMKIN. A suppression mechanism for C<sub>6</sub>F<sub>12</sub>O to HCNG combustion, consisting of 222 species and 1744 reactions is proposed. Findings show that, C<sub>6</sub>F<sub>12</sub>O outperforms CO<sub>2</sub> in flame suppression, demonstrating 2.25 times greater flame thickness inhibition, 5 times reduction in laminar burning velocity, 6.57 times lower adiabatic flame temperature, and 5 times more effectiveness in reducing heat release rate. Further analysis demonstrated that the adiabatic flame temperature linearly correlated with the volume fractions of C<sub>6</sub>F<sub>12</sub>O and CO<sub>2</sub>. Furthermore, the flame thickness, laminar burning velocity, maximum heat release rate, adiabatic flame temperature, sensitivity factors, and molar fractions of reactive radicals decreased with increasing the proportion of C<sub>6</sub>F<sub>12</sub>O and CO<sub>2</sub>. The results show that CO<sub>2</sub> primarily acts through physical dilution, whereas C<sub>6</sub>F<sub>12</sub>O dominates through chemical suppression, as free radicals are captured by fluorides. The C<sub>6</sub>F<sub>12</sub>O's major suppression reactions are: R830:CFO + H<img>CO + HF, R833:CF<sub>3</sub>+O<img>CF<sub>2</sub>O + F, and R925:CF<sub>2</sub>+OH<img>CF:O + HF. Findings will provide new insights for the prevention of HCNG explosions and reduce hazardous effects.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 523-534"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552252","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.457
Ruikang Li , Zhenmin Luo , Tao Wang , Anning Zhou , Jingxiang Hao , Yutao Guo
In view of the shortcomings of the research on the chemiluminescence intensity of OH in the flame propagation process of H2/CH4 mixtures explosion, especially the emission of OH at different positions during the flame propagation process of H2/CH4 explosion. A 20 L horizontal duct was used, combined with a high-speed camera and a transient spectrum test system, to study the characteristics of chemiluminescence emissions of OH measured at different positions during flame propagation H2/CH4 mixtures explosion under different volume fraction of H2(α) and different equivalence ratios(φ), and the relationship between chemiluminescence emissions and flame propagation. The experimental results show that the main wavelength of chemiluminescence emissions of OH is 308.9 nm, and its intensity is the largest and is most affected by the increase of α and φ. The large amount of afterglow emission during the convective motion of the flame flow field is an important reason why the emissions intensity at the second position is higher than at other positions. With the increase of α, the maximum emissions intensity of OH increases continuously and begins to increase abruptly at α = 0.6. When α changes, the maximum explosion pressure is closely related to the maximum emissions intensity of OH. The oscillation phenomenon increases the emissions intensity of OH at the 4th position when the explosion pressure decreases at the 2nd position, and when the explosion pressure at the 4th position decreases, the emissions intensity of OH at the 2nd position increases. The emissions of distorted 'Tulip' flame radicals mainly come from the flame front and afterglow emission, while the emissions of typical 'Tulip' flame radicals are more from afterglow emission. The research results can provide an experimental basis for the study of chemiluminescence emissions, and provide a theoretical basis for the development of targeted spraying inhibitors.
{"title":"Chemiluminescence emissions of OH measured at different positions during flame propagation of H2/CH4 mixtures explosion","authors":"Ruikang Li , Zhenmin Luo , Tao Wang , Anning Zhou , Jingxiang Hao , Yutao Guo","doi":"10.1016/j.ijhydene.2025.02.457","DOIUrl":"10.1016/j.ijhydene.2025.02.457","url":null,"abstract":"<div><div>In view of the shortcomings of the research on the chemiluminescence intensity of OH in the flame propagation process of H<sub>2</sub>/CH<sub>4</sub> mixtures explosion, especially the emission of OH at different positions during the flame propagation process of H<sub>2</sub>/CH<sub>4</sub> explosion. A 20 L horizontal duct was used, combined with a high-speed camera and a transient spectrum test system, to study the characteristics of chemiluminescence emissions of OH measured at different positions during flame propagation H<sub>2</sub>/CH<sub>4</sub> mixtures explosion under different volume fraction of H<sub>2</sub>(α) and different equivalence ratios(φ), and the relationship between chemiluminescence emissions and flame propagation. The experimental results show that the main wavelength of chemiluminescence emissions of OH is 308.9 nm, and its intensity is the largest and is most affected by the increase of α and φ. The large amount of afterglow emission during the convective motion of the flame flow field is an important reason why the emissions intensity at the second position is higher than at other positions. With the increase of α, the maximum emissions intensity of OH increases continuously and begins to increase abruptly at α = 0.6. When α changes, the maximum explosion pressure is closely related to the maximum emissions intensity of OH. The oscillation phenomenon increases the emissions intensity of OH at the 4th position when the explosion pressure decreases at the 2nd position, and when the explosion pressure at the 4th position decreases, the emissions intensity of OH at the 2nd position increases. The emissions of distorted 'Tulip' flame radicals mainly come from the flame front and afterglow emission, while the emissions of typical 'Tulip' flame radicals are more from afterglow emission. The research results can provide an experimental basis for the study of chemiluminescence emissions, and provide a theoretical basis for the development of targeted spraying inhibitors.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 420-428"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552397","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.420
Jiancheng Yang , Haojun Yang , Tao Xing , Yongming Sun , Bin Qu , Lianhua Li , Ying Li , Ying Guo , Feng Zhen , Yuwan Pang
In this study, the high performance hydrogenotrophic methanogenic bacteria were domesticated at different H2/CO2 molar ratios, and the influence of the addition of high performance hydrogenotrophic methanogenic bacteria on the methanogenic performance of the anaerobic digestion (AD) system and the change of microbial community structure were investigated. 16s rDNA showed that Methanobrevibacter was the dominant methanogenic bacterium at different methane production experiment results showed H2/CO2 molar ratios, and the maximum cumulative methane production of 220.87 ± 6.55 mL/g VS was obtained in the bioaugmentation experiments when using a domesticating agent with an H2/CO2 molar ratio of 4. In addition, the domesticating agent enhanced the hydrolysis and acidification steps, and changed the microbial community structure. This study demonstrated the potential of different H2/CO2 molar ratios for the domestication of high-performance hydrogen-based methanogenic bacteria.It would lay the foundation for the development of high-load anaerobic digestion in the future, and had great significance for the efficient and stable operation of biogas and biogas engineering.
{"title":"Insight into the mechanisms of methane production enhancement by bioaugmentation with H2/CO2 in anaerobic digestion","authors":"Jiancheng Yang , Haojun Yang , Tao Xing , Yongming Sun , Bin Qu , Lianhua Li , Ying Li , Ying Guo , Feng Zhen , Yuwan Pang","doi":"10.1016/j.ijhydene.2025.02.420","DOIUrl":"10.1016/j.ijhydene.2025.02.420","url":null,"abstract":"<div><div>In this study, the high performance hydrogenotrophic methanogenic bacteria were domesticated at different H<sub>2</sub>/CO<sub>2</sub> molar ratios, and the influence of the addition of high performance hydrogenotrophic methanogenic bacteria on the methanogenic performance of the anaerobic digestion (AD) system and the change of microbial community structure were investigated. 16s rDNA showed that <em>Methanobrevibacter</em> was the dominant methanogenic bacterium at different methane production experiment results showed H<sub>2</sub>/CO<sub>2</sub> molar ratios, and the maximum cumulative methane production of 220.87 ± 6.55 mL/g VS was obtained in the bioaugmentation experiments when using a domesticating agent with an H<sub>2</sub>/CO<sub>2</sub> molar ratio of 4. In addition, the domesticating agent enhanced the hydrolysis and acidification steps, and changed the microbial community structure. This study demonstrated the potential of different H<sub>2</sub>/CO<sub>2</sub> molar ratios for the domestication of high-performance hydrogen-based methanogenic bacteria.It would lay the foundation for the development of high-load anaerobic digestion in the future, and had great significance for the efficient and stable operation of biogas and biogas engineering.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 340-347"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551555","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.485
Rajangam Vinodh, Bruno G. Pollet
Creating affordable and efficient catalyst for water splitting is essential for sustainable hydrogen production. This study presents a nickel-doped vanadium pentoxide (Ni–V2O5) electrocatalyst synthesized via a hydrothermal method, demonstrating enhanced oxygen evolution reaction (OER) activity. Comprehensive characterization reveals that Ni incorporation into V2O5 enhances conductivity and increases active sites, contributing to improved catalytic performance. Electrochemical analyses, such as linear sweep voltammetry (LSV), Tafel slope measurements, and electrochemical impedance spectroscopy (EIS), demonstrate the superior performance of Ni–V2O5 compared to undoped V2O5. The Ni–V2O5 electrocatalyst achieves a low overpotential of 309 mV at +20 mA cm−2 and a Tafel slope of 24 mV dec−1, underscoring its promise as a robust electrocatalyst for practical water splitting applications.
{"title":"Facile and cost-effective nickel-anchored nanofibril V2O5 electrocatalyst for efficient oxygen evolution reaction","authors":"Rajangam Vinodh, Bruno G. Pollet","doi":"10.1016/j.ijhydene.2025.02.485","DOIUrl":"10.1016/j.ijhydene.2025.02.485","url":null,"abstract":"<div><div>Creating affordable and efficient catalyst for water splitting is essential for sustainable hydrogen production. This study presents a nickel-doped vanadium pentoxide (Ni–V<sub>2</sub>O<sub>5</sub>) electrocatalyst synthesized via a hydrothermal method, demonstrating enhanced oxygen evolution reaction (OER) activity. Comprehensive characterization reveals that Ni incorporation into V<sub>2</sub>O<sub>5</sub> enhances conductivity and increases active sites, contributing to improved catalytic performance. Electrochemical analyses, such as linear sweep voltammetry (LSV), Tafel slope measurements, and electrochemical impedance spectroscopy (EIS), demonstrate the superior performance of Ni–V<sub>2</sub>O<sub>5</sub> compared to undoped V<sub>2</sub>O<sub>5</sub>. The Ni–V<sub>2</sub>O<sub>5</sub> electrocatalyst achieves a low overpotential of 309 mV at +20 mA cm<sup>−2</sup> and a Tafel slope of 24 mV dec<sup>−1</sup>, underscoring its promise as a robust electrocatalyst for practical water splitting applications.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 395-405"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552197","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.479
Yuyi Liu, Diansen Yang, Yuna Cai
Underground hydrogen storage allows hydrogen to be stored as an energy carrier in subsurface formations and extracted when needed, enabling effective energy management. However, the understanding of hydrogen-water flow behavior, as well as the changes in storage capacity and recovery rates during multiple injection and production cycles, remains insufficient. In this study, we conducted numerical simulations using the Level Set method based on microfluidic systems. We discussed the influence characteristics of the key variables common in subsurface problems or those that are difficult to control experimentally, including pore structure, wettability, and flow rate. The flow patterns, initial and residual hydrogen saturation, and hydrogen recovery rates during injection and production processes were analyzed. Our results indicate that, for the injection process, due to the combined effects of high injection pressure, capillary action, and residual hydrogen, the flow channels at thin throats, high wettability and low flow rates situations gradually narrow within cycles, revealing significant flow instability. Additionally, under conditions of high wettability and low flow rate, the initial saturation and recovery rate of hydrogen are relatively low and decrease significantly with each injection cycle. When the contact angle is 40°, the initial saturation drops from 50% to 20%, and the recovery rate decreases from 90% to 50%. When the flow rate is 2 mL/h, the initial saturation declines from 69% to 61%, while the recovery rate decreases from 86% to 61%. For the production process, much higher residual saturation from 10% to 24% is observed only at low flow rates (2 mL/h) due to capillary characteristics. These findings can optimize the injection and production processes, providing technical support for Underground hydrogen storage and ensuring long-term stable operation.
{"title":"Numerical study on hydrogen-water flow in the microfluidic model for underground hydrogen storage in aquifers","authors":"Yuyi Liu, Diansen Yang, Yuna Cai","doi":"10.1016/j.ijhydene.2025.02.479","DOIUrl":"10.1016/j.ijhydene.2025.02.479","url":null,"abstract":"<div><div>Underground hydrogen storage allows hydrogen to be stored as an energy carrier in subsurface formations and extracted when needed, enabling effective energy management. However, the understanding of hydrogen-water flow behavior, as well as the changes in storage capacity and recovery rates during multiple injection and production cycles, remains insufficient. In this study, we conducted numerical simulations using the Level Set method based on microfluidic systems. We discussed the influence characteristics of the key variables common in subsurface problems or those that are difficult to control experimentally, including pore structure, wettability, and flow rate. The flow patterns, initial and residual hydrogen saturation, and hydrogen recovery rates during injection and production processes were analyzed. Our results indicate that, for the injection process, due to the combined effects of high injection pressure, capillary action, and residual hydrogen, the flow channels at thin throats, high wettability and low flow rates situations gradually narrow within cycles, revealing significant flow instability. Additionally, under conditions of high wettability and low flow rate, the initial saturation and recovery rate of hydrogen are relatively low and decrease significantly with each injection cycle. When the contact angle is 40°, the initial saturation drops from 50% to 20%, and the recovery rate decreases from 90% to 50%. When the flow rate is 2 mL/h, the initial saturation declines from 69% to 61%, while the recovery rate decreases from 86% to 61%. For the production process, much higher residual saturation from 10% to 24% is observed only at low flow rates (2 mL/h) due to capillary characteristics. These findings can optimize the injection and production processes, providing technical support for Underground hydrogen storage and ensuring long-term stable operation.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 406-419"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552392","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}
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