International Journal of Hydrogen Energy最新文献

英文中文

Facile synthesis of α/β-FeOOH-based self-supported hierarchical electrocatalysts on arbitrary metal substrates for efficient and hyper-stable HER, OER, UOR, and overall water splitting: A general strategy

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.391

Ze-Feng Xu, Chuan-Wu Chen, Ya-Nan Jing, Da-Qiang Liu, Hong-Xin Zhang, Qiu-Xia Lin, Lei-Lei Li, Xing-Liang Yin

Slow kinetics of the oxygen evolution reaction (OER) during water electrolysis limits hydrogen evolution reaction (HER) efficiency. Urea oxidation reaction (UOR), with a lower thermodynamic potential (0.37 V vs. RHE) than OER, offers an energy-saving alternative. Designing robust, multifunctional electrocatalysts for hydrogen generation by water electrolysis remains challenging. In this work, a universal two-stage solvothermal strategy was developed to synthesize α/β-FeOOH-based self-supported hierarchical structure catalysts on arbitrary metal substrates, evading polymeric binders. FeOOH/Fe achieves exceptional HER performance, while FeOOH/Ni delivers superior OER/UOR activity, exhibiting extremely-low UOR kinetics with a 12.24 mV·dec⁻¹ Tafel slope. Asymmetric FeOOH/Ni (+)||FeOOH/Fe (−) electrolyzer requires ultralow voltages of 1.799 V (1.0 M KOH), 1.888 V (seawater/1.0 M KOH), and 1.627 V (0.33 M urea/1.0 M KOH) to drive 300 mA cm⁻², surpassing most similar systems. It maintains >9 Faraday efficiency over 100-h at ≥ 300 mA cm⁻², demonstrating industrial-grade stability. The catalysts’ accessible active sites, accelerated charge transfer, rapid kinetics, and superhydrophilicity synergistically enable rapid mass/electron transport and durable operation. This work provides a scalable platform for binder-free electrocatalysts, advancing practical hydrogen production through urea-assisted electrolysis and seawater utilization.

{"title":"Facile synthesis of α/β-FeOOH-based self-supported hierarchical electrocatalysts on arbitrary metal substrates for efficient and hyper-stable HER, OER, UOR, and overall water splitting: A general strategy","authors":"Ze-Feng Xu, Chuan-Wu Chen, Ya-Nan Jing, Da-Qiang Liu, Hong-Xin Zhang, Qiu-Xia Lin, Lei-Lei Li, Xing-Liang Yin","doi":"10.1016/j.ijhydene.2025.04.391","DOIUrl":"10.1016/j.ijhydene.2025.04.391","url":null,"abstract":"<div><div>Slow kinetics of the oxygen evolution reaction (OER) during water electrolysis limits hydrogen evolution reaction (HER) efficiency. Urea oxidation reaction (UOR), with a lower thermodynamic potential (0.37 V vs. RHE) than OER, offers an energy-saving alternative. Designing robust, multifunctional electrocatalysts for hydrogen generation by water electrolysis remains challenging. In this work, a universal two-stage solvothermal strategy was developed to synthesize α/β-FeOOH-based self-supported hierarchical structure catalysts on arbitrary metal substrates, evading polymeric binders. FeOOH/Fe achieves exceptional HER performance, while FeOOH/Ni delivers superior OER/UOR activity, exhibiting extremely-low UOR kinetics with a 12.24 mV·dec<sup>−1</sup> Tafel slope. Asymmetric FeOOH/Ni (+)||FeOOH/Fe (−) electrolyzer requires ultralow voltages of 1.799 V (1.0 M KOH), 1.888 V (seawater/1.0 M KOH), and 1.627 V (0.33 M urea/1.0 M KOH) to drive 300 mA cm<sup>−2</sup>, surpassing most similar systems. It maintains >9 Faraday efficiency over 100-h at ≥ 300 mA cm<sup>−2</sup>, demonstrating industrial-grade stability. The catalysts’ accessible active sites, accelerated charge transfer, rapid kinetics, and superhydrophilicity synergistically enable rapid mass/electron transport and durable operation. This work provides a scalable platform for binder-free electrocatalysts, advancing practical hydrogen production through urea-assisted electrolysis and seawater utilization.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 202-212"},"PeriodicalIF":8.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869187","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 the instability and NO emission of NH3/O2/N2 laminar flame under O2-enriched conditions

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.379

Wenchao Yang , Guoyan Chen , Haoxin Deng , Jun Song , Tuo Zhou , Xiaoping Wen , Fahui Wang , Chenglong Yu

This study measures the laminar burning velocity (S_L) of NH₃/O₂/N₂ flames with different O₂ enrichment coefficient (Ω) by the constant volume combustion bomb. The flame instability is quantitatively analyzed by linear stability theory, and the effect of Ω on NO formation is analyzed by the mole fraction and production rate. Results indicate that the growth rate of S_L with the increase of Ω is relatively slow at rich burn. Linear stability analysis reveals that hydrodynamic instability persistently affects flame stability with increasing Ω or equivalence ratio, whereas thermal diffusion instability exerts a significant positive effect, which makes the growth rate of disturbance (∑) gradually decrease. The growth rate of NO mole fraction with Ω at lean burn is obviously higher than that at rich burn. Reaction path analysis indicates that O₂ enrichment enhances the importance of the NH₂ → NH → N → N₂ pathway.

{"title":"Study on the instability and NO emission of NH3/O2/N2 laminar flame under O2-enriched conditions","authors":"Wenchao Yang , Guoyan Chen , Haoxin Deng , Jun Song , Tuo Zhou , Xiaoping Wen , Fahui Wang , Chenglong Yu","doi":"10.1016/j.ijhydene.2025.04.379","DOIUrl":"10.1016/j.ijhydene.2025.04.379","url":null,"abstract":"<div><div>This study measures the laminar burning velocity (<em>S</em><sub><em>L</em></sub>) of NH<sub>3</sub>/O<sub>2</sub>/N<sub>2</sub> flames with different O<sub>2</sub> enrichment coefficient (<em>Ω</em>) by the constant volume combustion bomb. The flame instability is quantitatively analyzed by linear stability theory, and the effect of <em>Ω</em> on NO formation is analyzed by the mole fraction and production rate. Results indicate that the growth rate of <em>S</em><sub><em>L</em></sub> with the increase of <em>Ω</em> is relatively slow at rich burn. Linear stability analysis reveals that hydrodynamic instability persistently affects flame stability with increasing <em>Ω</em> or equivalence ratio, whereas thermal diffusion instability exerts a significant positive effect, which makes the growth rate of disturbance (<em>∑</em>) gradually decrease. The growth rate of NO mole fraction with <em>Ω</em> at lean burn is obviously higher than that at rich burn. Reaction path analysis indicates that O<sub>2</sub> enrichment enhances the importance of the NH<sub>2</sub> → NH → N → N<sub>2</sub> pathway.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 156-167"},"PeriodicalIF":8.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869196","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

Enhanced hydroxide conductivity and dimensional stability in quaternized polybenzimidazole-based nanocomposite membranes containing ionic liquid-impregnated covalent organic framework for anion exchange membrane fuel cells

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.319

Li-Cheng Jheng , Wei-Yu Chen , Guan-Lun Huang , Zhi-Ling Zhao , Steve Lien-Chung Hsu , Wen-Ching Ko

Anion exchange membrane fuel cells (AEMFCs) offer a cost-effective alternative to proton exchange membrane fuel cells (PEMFCs), but their performance is often constrained by the low ionic conductivity of anion exchange membranes (AEMs). In this study, we developed a high-performance nanocomposite AEM by incorporating covalent organic framework particles impregnated with imidazolium ionic liquid (Im@COF-LZU1) into a quaternized polybenzimidazole with imidazolium side chains (PBI-Im). The interconnected nanochannels of Im@COF-LZU1 provided additional ion transport pathways, while its rigid framework restricted polymer side-chain mobility, enhancing both hydroxide conductivity and dimensional stability. At an optimal filler content of 5 wt %, the nanocomposite membrane exhibited a hydroxide conductivity of 0.0592 S/cm at 80°C—an 183 % increase over the pristine membrane—along with a high ion exchange capacity (2.89 mmol/g) and a low swelling ratio (3.8 %). Additionally, the membrane demonstrated superior oxidative stability and improved fuel cell performance. These findings suggest that Im@COF-LZU1 is a promising filler for high-performance AEMs used in fuel cell applications.

{"title":"Enhanced hydroxide conductivity and dimensional stability in quaternized polybenzimidazole-based nanocomposite membranes containing ionic liquid-impregnated covalent organic framework for anion exchange membrane fuel cells","authors":"Li-Cheng Jheng , Wei-Yu Chen , Guan-Lun Huang , Zhi-Ling Zhao , Steve Lien-Chung Hsu , Wen-Ching Ko","doi":"10.1016/j.ijhydene.2025.04.319","DOIUrl":"10.1016/j.ijhydene.2025.04.319","url":null,"abstract":"<div><div>Anion exchange membrane fuel cells (AEMFCs) offer a cost-effective alternative to proton exchange membrane fuel cells (PEMFCs), but their performance is often constrained by the low ionic conductivity of anion exchange membranes (AEMs). In this study, we developed a high-performance nanocomposite AEM by incorporating covalent organic framework particles impregnated with imidazolium ionic liquid (Im@COF-LZU1) into a quaternized polybenzimidazole with imidazolium side chains (PBI-Im). The interconnected nanochannels of Im@COF-LZU1 provided additional ion transport pathways, while its rigid framework restricted polymer side-chain mobility, enhancing both hydroxide conductivity and dimensional stability. At an optimal filler content of 5 wt %, the nanocomposite membrane exhibited a hydroxide conductivity of 0.0592 S/cm at 80°C—an 183 % increase over the pristine membrane—along with a high ion exchange capacity (2.89 mmol/g) and a low swelling ratio (3.8 %). Additionally, the membrane demonstrated superior oxidative stability and improved fuel cell performance. These findings suggest that Im@COF-LZU1 is a promising filler for high-performance AEMs used in fuel cell applications.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 108-118"},"PeriodicalIF":8.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869194","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

Insights into the role of metal dopant on ammonia decomposition over graphene-supported Ni6, Ni5Pt, and Ni5Rh clusters

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.357

Alfani Yusuf , Reva Budiantono , Firman Bagja Juangsa , Muhammad Aziz , Muhammad Arif Budiyanto , Adhitya Gandaryus Saputro , Muhammad Haris Mahyuddin

Ammonia (NH₃) is a promising hydrogen (H₂) carrier, owing to its high hydrogen content and ease of storage. However, efficient catalytic decomposition of NH₃ to H₂ remains challenging. This study investigates the catalytic activity of graphene-supported Ni₆, Ni₅Pt, and Ni₅Rh clusters for NH₃ decomposition to N₂ and H₂ using density functional theory (DFT) calculations. The results show that the addition of Pt and Rh dopants weakens the adsorption of intermediates formed during the NH₃ dehydrogenation step and slightly increases the activation energies. Interestingly, however, this drawback becomes a key factor in enhancing the activity of the subsequent N–N association and H–H recombination steps, which are critical for the reaction to cycle. Our electronic structure analysis reveals that the decreased activity in the NH₃ dehydrogenation step but increased activity in the N₂ and H₂ formation steps are due to the ligand effect exerted by Pt and Rh. Specifically, since the metal dopants have higher electronegativities than Ni, the number of electrons at the preferred Ni-edge site decreases and eventually weakens the adsorption. Furthermore, the spatially broad nature of the Pt-5d and Rh-4d orbitals delocalizes the cluster's electron distribution, which weakens the 2N and 2H adsorption and thus eases the N₂ and H₂ formation. This study provides insights into the role of noble metal dopants in optimizing Ni-based catalysts for NH₃ decomposition, paving the way for efficient H₂ utility technologies.

{"title":"Insights into the role of metal dopant on ammonia decomposition over graphene-supported Ni6, Ni5Pt, and Ni5Rh clusters","authors":"Alfani Yusuf , Reva Budiantono , Firman Bagja Juangsa , Muhammad Aziz , Muhammad Arif Budiyanto , Adhitya Gandaryus Saputro , Muhammad Haris Mahyuddin","doi":"10.1016/j.ijhydene.2025.04.357","DOIUrl":"10.1016/j.ijhydene.2025.04.357","url":null,"abstract":"<div><div>Ammonia (NH<sub>3</sub>) is a promising hydrogen (H<sub>2</sub>) carrier, owing to its high hydrogen content and ease of storage. However, efficient catalytic decomposition of NH<sub>3</sub> to H<sub>2</sub> remains challenging. This study investigates the catalytic activity of graphene-supported Ni<sub>6</sub>, Ni<sub>5</sub>Pt, and Ni<sub>5</sub>Rh clusters for NH<sub>3</sub> decomposition to N<sub>2</sub> and H<sub>2</sub> using density functional theory (DFT) calculations. The results show that the addition of Pt and Rh dopants weakens the adsorption of intermediates formed during the NH<sub>3</sub> dehydrogenation step and slightly increases the activation energies. Interestingly, however, this drawback becomes a key factor in enhancing the activity of the subsequent N–N association and H–H recombination steps, which are critical for the reaction to cycle. Our electronic structure analysis reveals that the decreased activity in the NH<sub>3</sub> dehydrogenation step but increased activity in the N<sub>2</sub> and H<sub>2</sub> formation steps are due to the ligand effect exerted by Pt and Rh. Specifically, since the metal dopants have higher electronegativities than Ni, the number of electrons at the preferred Ni-edge site decreases and eventually weakens the adsorption. Furthermore, the spatially broad nature of the Pt-5d and Rh-4d orbitals delocalizes the cluster's electron distribution, which weakens the 2N and 2H adsorption and thus eases the N<sub>2</sub> and H<sub>2</sub> formation. This study provides insights into the role of noble metal dopants in optimizing Ni-based catalysts for NH<sub>3</sub> decomposition, paving the way for efficient H<sub>2</sub> utility technologies.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 168-175"},"PeriodicalIF":8.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869295","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

Morphology engineering of rutile/anatase-TiO2 heterophase junctions for enhanced photoelectrochemical properties

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.184

Qun Liu , Yangdong Zhang , Xingyu Chen , Chunlin Zhao , Xiao Wu , Tengfei Lin , Zedong Xu , Min Gao , Cong Lin

TiO₂ is a promising photoelectrochemical (PEC) material as photoanodes for photoelectric conversion. However, severe charge recombination issues in TiO₂ significantly hinder the PEC efficiency and thus its application. It has been reported that the construction of rutile/anatase (R/A) heterophase junctions benefits fast charge transfer via interfaces and improves the efficiency of conversion. However, the evolution of R and/or A phases and their morphology and phase-transition effect on the PEC properties have not been investigated. In this study, unique TiO₂ heterophase junctions consisting of R-phase nanorods on the titanate-coexisting-phase (CO-phase) truncated octahedral particles were fabricated through a two-step hydrothermal method, where the morphology and phase transition of a titanate-coexisting phase was meticulously controlled and carefully monitored. The heterophase junctions exhibited superior PEC performances with a photocurrent density of 1.62 ± 0.05 mA cm⁻² at 1.23 V, which was 4.3 times and 1.6 times greater than that of pure R phase and R-nanorod/A-nanosheet, respectively. This work demonstrates the potential of morphology engineering and phase transition of photoanodes for highly efficient photoelectric conversion.

{"title":"Morphology engineering of rutile/anatase-TiO2 heterophase junctions for enhanced photoelectrochemical properties","authors":"Qun Liu , Yangdong Zhang , Xingyu Chen , Chunlin Zhao , Xiao Wu , Tengfei Lin , Zedong Xu , Min Gao , Cong Lin","doi":"10.1016/j.ijhydene.2025.04.184","DOIUrl":"10.1016/j.ijhydene.2025.04.184","url":null,"abstract":"<div><div>TiO<sub>2</sub> is a promising photoelectrochemical (PEC) material as photoanodes for photoelectric conversion. However, severe charge recombination issues in TiO<sub>2</sub> significantly hinder the PEC efficiency and thus its application. It has been reported that the construction of rutile/anatase (R/A) heterophase junctions benefits fast charge transfer via interfaces and improves the efficiency of conversion. However, the evolution of R and/or A phases and their morphology and phase-transition effect on the PEC properties have not been investigated. In this study, unique TiO<sub>2</sub> heterophase junctions consisting of R-phase nanorods on the titanate-coexisting-phase (CO-phase) truncated octahedral particles were fabricated through a two-step hydrothermal method, where the morphology and phase transition of a titanate-coexisting phase was meticulously controlled and carefully monitored. The heterophase junctions exhibited superior PEC performances with a photocurrent density of 1.62 ± 0.05 mA cm<sup>−2</sup> at 1.23 V, which was 4.3 times and 1.6 times greater than that of pure R phase and R-nanorod/A-nanosheet, respectively. This work demonstrates the potential of morphology engineering and phase transition of photoanodes for highly efficient photoelectric conversion.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"131 ","pages":"Pages 12-19"},"PeriodicalIF":8.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874430","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

Inducing state transitions in algae for efficient photosynthetic hydrogen production

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.349

Shangsong Li, Zhengyu Tao, Luxuan Li, Song Lin, Yan Huang, Rui Nie, Xiaoman Liu, Xin Huang

The growing energy crisis and environmental pollution have driven the need for green energy solutions. Biological photosynthetic hydrogen production holds great promise but is hindered by low hydrogen production efficiency. This study proposed a dark adaptation strategy to enhance algal hydrogen production, achieving a high average hydrogen production rate of 19.42 μmol H₂ (mg chlorophyll)⁻¹h⁻¹. Dark adaptation activates hydrogenases and shifts the light-harvesting complex II from PS II to PS I, enhancing hydrogen production. By applying dark adaptation every 25 days, continuous hydrogen generation was sustained for over 150 days, yielding 3.81 L of H₂ in a 50 mL photoreactor. This efficient and scalable method advances algae-based green energy, promoting its commercial application and accelerating the transition to sustainable energy.

引用次数: 0

A review of catalytic hydrogen production using metallic membrane reactors

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.323

Peijun Li, Tao Li, Rui Xiao

Hydrogen is as an abundant, and environmentally friendly energy carrier, which sparks considerable interest in its production, purification, transport/storage and utilization. Among various hydrogen purification technologies, metallic membranes for hydrogen separation hold enormous potential for obtaining ultra-pure hydrogen, while integrated membrane reactors can help overcome thermodynamic limitations of hydrogen production via catalytic reactions. This review article comprehensively examines state-of-the-art metallic (Pd-based, nickel-based and vanadium-based) membranes for hydrogen separation, covering both preparation techniques and optimization strategies. In addition, membrane reactors coupled with hydrogen separation membrane were introduced, featuring three typical catalytic reactions including water-gas shift, reforming reactions, and dehydrogenation reactions. Moreover, a comparative analysis of the pros and cons of major metallic membranes (Pd, Ni) has been conducted, along with a discussion of existing challenges and future prospects. This review aims to provide a valuable reference for the development and application of metallic membranes and relevant membrane reactors.

{"title":"A review of catalytic hydrogen production using metallic membrane reactors","authors":"Peijun Li, Tao Li, Rui Xiao","doi":"10.1016/j.ijhydene.2025.04.323","DOIUrl":"10.1016/j.ijhydene.2025.04.323","url":null,"abstract":"<div><div>Hydrogen is as an abundant, and environmentally friendly energy carrier, which sparks considerable interest in its production, purification, transport/storage and utilization. Among various hydrogen purification technologies, metallic membranes for hydrogen separation hold enormous potential for obtaining ultra-pure hydrogen, while integrated membrane reactors can help overcome thermodynamic limitations of hydrogen production via catalytic reactions. This review article comprehensively examines state-of-the-art metallic (Pd-based, nickel-based and vanadium-based) membranes for hydrogen separation, covering both preparation techniques and optimization strategies. In addition, membrane reactors coupled with hydrogen separation membrane were introduced, featuring three typical catalytic reactions including water-gas shift, reforming reactions, and dehydrogenation reactions. Moreover, a comparative analysis of the pros and cons of major metallic membranes (Pd, Ni) has been conducted, along with a discussion of existing challenges and future prospects. This review aims to provide a valuable reference for the development and application of metallic membranes and relevant membrane reactors.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 176-190"},"PeriodicalIF":8.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869192","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

The role of Pt-black in achieving ultra-low iridium loadings for proton exchange membrane electrolyzers

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.249

Hongjie Liao , Sandor Hollo , Zebai Chen , Ja-Yeon Choi , Kyoung Bai , Shaoyi Xu , Katie Pei , Ye Peng , Dustin Banham

Proton exchange membrane water electrolyzers (PEMWEs) are a promising technology for generating clean hydrogen. However, their reliance on high contents of costly iridium (Ir) presents a significant economic barrier. Reducing loadings from conventional values of ∼1–2 mg_Ir cm⁻² to <0.3 mg_Ir cm⁻² has been highly challenging due to a loss of continuity in the anode layer at such low loadings. This study explores the addition of platinum (Pt) to the anode layer to improve electronic connectivity. We conduct a detailed investigation into the required Pt loadings to ensure sufficient electronic pathways. While previous work indicated a loading of 1 mg_Pt cm⁻² is necessary to overcome low Ir loading limitations, it is shown here that for a 0.1 mg_Ir cm⁻² anode layer, a loading of only 0.3 mg_Pt cm⁻² can enable a full electronic connection within the anode layer, with higher loadings having no additional kinetic/conductivity benefit and in fact resulting in larger mass transfer (MT) losses. Finally, we provide a brief cost analysis to determine under which scenarios this strategy is economically viable.

{"title":"The role of Pt-black in achieving ultra-low iridium loadings for proton exchange membrane electrolyzers","authors":"Hongjie Liao , Sandor Hollo , Zebai Chen , Ja-Yeon Choi , Kyoung Bai , Shaoyi Xu , Katie Pei , Ye Peng , Dustin Banham","doi":"10.1016/j.ijhydene.2025.04.249","DOIUrl":"10.1016/j.ijhydene.2025.04.249","url":null,"abstract":"<div><div>Proton exchange membrane water electrolyzers (PEMWEs) are a promising technology for generating clean hydrogen. However, their reliance on high contents of costly iridium (Ir) presents a significant economic barrier. Reducing loadings from conventional values of ∼1–2 mg<sub>Ir</sub> cm<sup>−2</sup> to <0.3 mg<sub>Ir</sub> cm<sup>−2</sup> has been highly challenging due to a loss of continuity in the anode layer at such low loadings. This study explores the addition of platinum (Pt) to the anode layer to improve electronic connectivity. We conduct a detailed investigation into the required Pt loadings to ensure sufficient electronic pathways. While previous work indicated a loading of 1 mg<sub>Pt</sub> cm<sup>−2</sup> is necessary to overcome low Ir loading limitations, it is shown here that for a 0.1 mg<sub>Ir</sub> cm<sup>−2</sup> anode layer, a loading of only 0.3 mg<sub>Pt</sub> cm<sup>−2</sup> can enable a full electronic connection within the anode layer, with higher loadings having no additional kinetic/conductivity benefit and in fact resulting in larger mass transfer (MT) losses. Finally, we provide a brief cost analysis to determine under which scenarios this strategy is economically viable.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"130 ","pages":"Pages 139-146"},"PeriodicalIF":8.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869198","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

Direct seawater electrolysis: Breaking the dependency on noble metal-based electrocatalysts

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.387

Mi Gyoung Lee, Seoungyeon Kim, Yelin Lee

The scarcity of freshwater in renewable energy sources has prompted research into direct seawater electrolysis to generate carbon-neutral hydrogen. While current approaches rely heavily on precious metal-based electrocatalysts, the complex composition of seawater presents significant challenges including competitive chlorine evolution reactions, low catalytic efficiency, and electrode corrosion, necessitating technological breakthroughs for practical direct seawater electrolysis. In this review, we discuss the fundamental principles, key challenges, and recent advances in the rational design of electrocatalysts for direct seawater electrolysis. In particular, we categorize state-of-the-art strategies for designing noble metal-free electrocatalysts tailored to the oxygen evolution reaction and hydrogen evolution reaction in natural seawater. We then, put forward an outlook on future directions, emphasizing the need for durable and efficient electrocatalysts to enhance the techno-economic viability of this emerging field. This review provides perspectives that support the advancement of seawater electrolysis toward sustainable energy conversion and environmental protection.

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引用次数: 0

Enhanced high-purity syngas production and sustainable chemicals synthesis via chemical looping dry reforming of methane

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy

Pub Date : 2025-04-25 DOI: 10.1016/j.ijhydene.2025.04.271

Tianlong Yang , Yu Xin , Jinrui Zhang , Taixiu Liu , Mingkai Liu , Ruqi Zhang , Ying Pan , Hongguang Jin

Dry reforming of methane (DRM) utilizes two major greenhouse gases, CO₂ and CH₄, to produce syngas (CO and H₂), which is an important chemical intermediate resource for high-value chemicals synthesis. However, conventional DRM faces challenges such as catalyst deactivation, low product selectivity, and an unsuitable syngas ratio for downstream chemicals synthesis. To address these limitations, we propose a chemical looping dry reforming of methane (CLDRM) method, which achieves high methane conversion, superior syngas selectivity, and high-purity syngas for chemicals synthesis. In this study, 100 cycles of experiments were carried out using the LaFe_0.8Al_0.2O₃ oxygen carrier. The results showed 88.3 % CH₄ conversion, over 99 % CO selectivity, and a syngas yield of 8.1 mmol/g with an H₂/CO ratio of 2 during the methane partial oxidation (POx) step. In the CO₂ splitting step, the system achieved 81.3 % CO₂ conversion with a CO yield of 2.6 mmol/g. The energy upgrade factor during the cycle reached 1.98. Furthermore, the performance of the proposed CLDRM-based chemicals production system was analyzed, taking acetic acid synthesis as a typical case. The new system achieved energy and exergy efficiencies of 62.9 % and 65.4 %, respectively, representing improvements of 11.5 % and 12.2 % compared to the conventional DRM system. Additionally, the new system reduced methane consumption by 8.84 % while increasing the CO₂ fixation rate by 50.54 %. In summary, the proposed CLDRM process offers a promising pathway for CO₂ reduction and cleaner utilization of CH₄ for high-value chemicals production, supporting the transition to a more sustainable and low-carbon future.

{"title":"Enhanced high-purity syngas production and sustainable chemicals synthesis via chemical looping dry reforming of methane","authors":"Tianlong Yang , Yu Xin , Jinrui Zhang , Taixiu Liu , Mingkai Liu , Ruqi Zhang , Ying Pan , Hongguang Jin","doi":"10.1016/j.ijhydene.2025.04.271","DOIUrl":"10.1016/j.ijhydene.2025.04.271","url":null,"abstract":"<div><div>Dry reforming of methane (DRM) utilizes two major greenhouse gases, CO<sub>2</sub> and CH<sub>4</sub>, to produce syngas (CO and H<sub>2</sub>), which is an important chemical intermediate resource for high-value chemicals synthesis. However, conventional DRM faces challenges such as catalyst deactivation, low product selectivity, and an unsuitable syngas ratio for downstream chemicals synthesis. To address these limitations, we propose a chemical looping dry reforming of methane (CLDRM) method, which achieves high methane conversion, superior syngas selectivity, and high-purity syngas for chemicals synthesis. In this study, 100 cycles of experiments were carried out using the LaFe<sub>0.8</sub>Al<sub>0.2</sub>O<sub>3</sub> oxygen carrier. The results showed 88.3 % CH<sub>4</sub> conversion, over 99 % CO selectivity, and a syngas yield of 8.1 mmol/g with an H<sub>2</sub>/CO ratio of 2 during the methane partial oxidation (POx) step. In the CO<sub>2</sub> splitting step, the system achieved 81.3 % CO<sub>2</sub> conversion with a CO yield of 2.6 mmol/g. The energy upgrade factor during the cycle reached 1.98. Furthermore, the performance of the proposed CLDRM-based chemicals production system was analyzed, taking acetic acid synthesis as a typical case. The new system achieved energy and exergy efficiencies of 62.9 % and 65.4 %, respectively, representing improvements of 11.5 % and 12.2 % compared to the conventional DRM system. Additionally, the new system reduced methane consumption by 8.84 % while increasing the CO<sub>2</sub> fixation rate by 50.54 %. In summary, the proposed CLDRM process offers a promising pathway for CO<sub>2</sub> reduction and cleaner utilization of CH<sub>4</sub> for high-value chemicals production, supporting the transition to a more sustainable and low-carbon future.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"129 ","pages":"Pages 265-278"},"PeriodicalIF":8.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869829","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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