Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.394
Ammar Bin Yousaf , Anton Popelka , Andrey L. Rogach , Peter Kasak
The design of a catalyst plays a significant role in developing high-performance renewable energy materials. Among these, the catalyst engineering for the electrochemical oxidation of fuels at the anode of the fuel cells has drawn focus due to their broad impact on modern research. To this end, major challenges have been considered, including enhanced performance, a durable nature, and the low economic cost of the electrocatalyst material. Handling the mentioned goals, cubic-shaped copper (I) oxide (Cu2O) as catalyst support for the fabrication of low-content PtIr binary alloys has been used to synthesize a catalyst. Among the brief library of the synthesized catalysts series, Pt2Ir1/Cu2O NC has exhibited enhanced oxidation of methanol in a half-cell testing system with high current density (1443 mA/mgPt) and low onset oxidation potential (∼0.45 V vs RHE), thus outperforming commercial Pt/C and PtRu/C electrocatalysts. Additionally, this electrocatalyst exhibited a superior performance in ethanol oxidation reaction with high current density (2190 mA/mgPt), which also exceeded the respective value of the commercial Pt/C (657 mA/mgPt) and other catalysts investigated in this study. The exceptional performance is mainly ascribed to the structural and electronic effects joining strong metal-to-support interactions among the catalyst material, which are also successfully confirmed from materials characterizations.
{"title":"Copper (I) oxide nanocubes loaded with a low-content binary PtIr alloy enable enhanced methanol/ ethanol oxidation","authors":"Ammar Bin Yousaf , Anton Popelka , Andrey L. Rogach , Peter Kasak","doi":"10.1016/j.ijhydene.2025.02.394","DOIUrl":"10.1016/j.ijhydene.2025.02.394","url":null,"abstract":"<div><div>The design of a catalyst plays a significant role in developing high-performance renewable energy materials. Among these, the catalyst engineering for the electrochemical oxidation of fuels at the anode of the fuel cells has drawn focus due to their broad impact on modern research. To this end, major challenges have been considered, including enhanced performance, a durable nature, and the low economic cost of the electrocatalyst material. Handling the mentioned goals, cubic-shaped copper (I) oxide (Cu<sub>2</sub>O) as catalyst support for the fabrication of low-content PtIr binary alloys has been used to synthesize a catalyst. Among the brief library of the synthesized catalysts series, Pt<sub>2</sub>Ir<sub>1</sub>/Cu<sub>2</sub>O NC has exhibited enhanced oxidation of methanol in a half-cell testing system with high current density (1443 mA/mg<sub>Pt</sub>) and low onset oxidation potential (∼0.45 V vs RHE), thus outperforming commercial Pt/C and PtRu/C electrocatalysts. Additionally, this electrocatalyst exhibited a superior performance in ethanol oxidation reaction with high current density (2190 mA/mg<sub>Pt</sub>), which also exceeded the respective value of the commercial Pt/C (657 mA/mg<sub>Pt</sub>) and other catalysts investigated in this study. The exceptional performance is mainly ascribed to the structural and electronic effects joining strong metal-to-support interactions among the catalyst material, which are also successfully confirmed from materials characterizations.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 441-450"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551559","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.2025.02.375
A.P. Voyt , A.P. Baraban , D.I. Elets , I.E. Gabis , M.A. Murzinova , N.I. Sidorov
Vanadium is a promising base for the manufacture of highly permeable hydrogen diffusion filters. In this study, the multi-component alloy V-15 (Cr–Co–Fe–Ni) was investigated and compared with the previously investigated alloy V–15Ni. The V-15 (Cr–Co–Fe–Ni) alloy showed acceptable hydrogen solubility comparable to that of the V–15Ni alloy. Hydrogen solubility parameters were determined in the temperature range 100–600 °C and pressure 0.1–1000 Torr.
The microstructure of the alloy has a dendritic type. The vanadium content varies from 74 to 90 at.%. Nickel forms the largest microsegregations. The most uniformly distributed element is chromium, which dissolves indefinitely in vanadium.
Microcracks were detected in the sample after 92 cycles of hydrogen saturation. They mainly passed through areas of higher vanadium concentration and therefore with the highest equilibrium solubility of hydrogen. We believe that the cause of the cracks is local variations in the concentration of dissolved hydrogen resulting in mechanical stress.
{"title":"Multicomponent alloy V-15(Fe–Co–Cr–Ni) for hydrogen filters: Solubility and structure","authors":"A.P. Voyt , A.P. Baraban , D.I. Elets , I.E. Gabis , M.A. Murzinova , N.I. Sidorov","doi":"10.1016/j.ijhydene.2025.02.375","DOIUrl":"10.1016/j.ijhydene.2025.02.375","url":null,"abstract":"<div><div>Vanadium is a promising base for the manufacture of highly permeable hydrogen diffusion filters. In this study, the multi-component alloy V-15 (Cr–Co–Fe–Ni) was investigated and compared with the previously investigated alloy V–15Ni. The V-15 (Cr–Co–Fe–Ni) alloy showed acceptable hydrogen solubility comparable to that of the V–15Ni alloy. Hydrogen solubility parameters were determined in the temperature range 100–600 °C and pressure 0.1–1000 Torr.</div><div>The microstructure of the alloy has a dendritic type. The vanadium content varies from 74 to 90 at.%. Nickel forms the largest microsegregations. The most uniformly distributed element is chromium, which dissolves indefinitely in vanadium.</div><div>Microcracks were detected in the sample after 92 cycles of hydrogen saturation. They mainly passed through areas of higher vanadium concentration and therefore with the highest equilibrium solubility of hydrogen. We believe that the cause of the cracks is local variations in the concentration of dissolved hydrogen resulting in mechanical stress.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 348-354"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551561","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.2025.03.003
Søren A. Tornøe , John W. Koster , Andy V. Surin , Jacob H. Sands , Nobuhiko P. Kobayashi
Seawater electrolysis preferentially leans towards Chlorine Evolution Reaction (CER) over Oxygen Evolution Reactions (OER) under conventional conditions, but OER becomes more dominant at sufficiently higher current densities. In this study, we evaluated the effector of cylindrical and conical electrode geometries on CER and hydrogen production at high current density (i.e., >1 A cm−2). We found the point of lowest CER within a voltage range of 40 V–90 V. Conical electrodes, optimized to reduce CER, produced a magnitude less chloride (502 ppb) than cylindrical electrodes (1485 ppb) at nearly double the current density (∼12 and ∼6 A cm−2 respectively). However, this reduction in CER with conical electrodes was accompanied by a 25% decrease in hydrogen production. In addition, both cylindrical and conical electrodes were able to heat 500 ml of seawater by approximately 6–7 °C over a 2-min period with cylindrical electrodes heating slightly less than conical electrodes.
{"title":"Seawater electrolysis at ultra-high current density: A comparative analysis of cylindrical versus conical electrodes","authors":"Søren A. Tornøe , John W. Koster , Andy V. Surin , Jacob H. Sands , Nobuhiko P. Kobayashi","doi":"10.1016/j.ijhydene.2025.03.003","DOIUrl":"10.1016/j.ijhydene.2025.03.003","url":null,"abstract":"<div><div>Seawater electrolysis preferentially leans towards Chlorine Evolution Reaction (CER) over Oxygen Evolution Reactions (OER) under conventional conditions, but OER becomes more dominant at sufficiently higher current densities. In this study, we evaluated the effector of cylindrical and conical electrode geometries on CER and hydrogen production at high current density (i.e., >1 A cm<sup>−2</sup>). We found the point of lowest CER within a voltage range of 40 V–90 V. Conical electrodes, optimized to reduce CER, produced a magnitude less chloride (502 ppb) than cylindrical electrodes (1485 ppb) at nearly double the current density (∼12 and ∼6 A cm<sup>−2</sup> respectively). However, this reduction in CER with conical electrodes was accompanied by a 25% decrease in hydrogen production. In addition, both cylindrical and conical electrodes were able to heat 500 ml of seawater by approximately 6–7 °C over a 2-min period with cylindrical electrodes heating slightly less than conical electrodes.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"114 ","pages":"Pages 9-17"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547864","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}
Recently, there has been growing interest in electrolysis under forced periodic dynamic conditions, known as pulsed electrolysis, due to its potential to enhance cell efficiency. In the context of water electrolysis, there is ongoing debate about whether pulsed electrolysis, which involves a superposition of direct current (DC) and alternating current (AC), can improve the efficiency compared to the steady-state (DC) operation. Some studies suggest that pulsed electrolysis enhances process efficiency while others report a decline. Here, we present a compelling argument that pulsed electrolysis consistently deteriorates the efficiency of water electrolysis. A proof using Jensen’s inequality demonstrates that enhancing efficiency under pulsed electrolysis is impossible. The proof employs a common model describing the PEM electrolysis cell. Our findings conclude that steady-state (DC) operation is the optimal operating strategy to minimize specific power consumption and thus maximize the efficiency of water electrolyzers. We expect similar results for other electrolyzer models.
{"title":"Efficiency improvement by pulsed water electrolysis: An unjustified hope","authors":"Simon Puteanus , Tamara Miličić , Ute Feldmann , Tanja Vidaković-Koch","doi":"10.1016/j.ijhydene.2025.02.348","DOIUrl":"10.1016/j.ijhydene.2025.02.348","url":null,"abstract":"<div><div>Recently, there has been growing interest in electrolysis under forced periodic dynamic conditions, known as pulsed electrolysis, due to its potential to enhance cell efficiency. In the context of water electrolysis, there is ongoing debate about whether pulsed electrolysis, which involves a superposition of direct current (DC) and alternating current (AC), can improve the efficiency compared to the steady-state (DC) operation. Some studies suggest that pulsed electrolysis enhances process efficiency while others report a decline. Here, we present a compelling argument that pulsed electrolysis consistently deteriorates the efficiency of water electrolysis. A proof using Jensen’s inequality demonstrates that enhancing efficiency under pulsed electrolysis is impossible. The proof employs a common model describing the PEM electrolysis cell. Our findings conclude that steady-state (DC) operation is the optimal operating strategy to minimize specific power consumption and thus maximize the efficiency of water electrolyzers. We expect similar results for other electrolyzer models.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 478-484"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552391","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}
Pub Date : 2025-03-05DOI: 10.1016/j.ijhydene.2025.02.476
Ryun-Ho Kwak, Sojin Jung, Tae-Yoon Park, Sung-Min Park, Hyung-Ki Park
This study investigated the microstructural features and hydrogen storage properties of TiFe-based quaternary alloys, where Fe in the TiFe0.8Mn0.2 alloy was additionally substituted with the transition metals of V, Cr, Co, Ni, and Cu (TiFe0.7Mn0.2X0.1 (X = V, Cr, Co, Ni, Cu)). The TiFe0.8Mn0.2 alloy exhibited a dual-phase microstructure consisting of the B2 and C14 Laves phases. The substitution of Fe with V, Cr, and Ni increased the Laves phase percentage, while the formation of the Laves phase was suppressed in alloys with Co and Cu substitutions. In all the alloys, a small amount of the Ti2Fe phase was precipitated. The room-temperature activation properties of the alloys were evaluated. The TiFe0.7Mn0.2Cr0.1 alloy, with the highest Laves phase percentage, exhibited the fastest first hydrogenation kinetics, while the kinetics slowed as the Laves phase percentage decreased. The TiFe0.7Mn0.2Co0.1 and TiFe0.7Mn0.2Cu0.1 alloys, which did not form the Laves phase, displayed slower kinetics; however, the room-temperature activation was still achievable due to the formation of the Ti2Fe phase. The hydrogen storage properties of the alloys were examined. The TiFe0.7Mn0.2V0.1 and TiFe0.7Mn0.2Co0.1 alloys exhibited similar hydrogen absorption and desorption behaviors to the TiFe0.8Mn0.2 alloy, while the other alloys showed steeper plateau pressure slopes. The effective hydrogen storage capacities were evaluated under conditions of hydrogen absorption up to 10 bar at 30 °C and hydrogen desorption down to 2 bar at 70 °C. The TiFe0.7Mn0.2V0.1 alloy exhibited a similar effective hydrogen storage capacity to the TiFe0.8Mn0.2 alloy, whereas the storage capacity of the TiFe0.7Mn0.2Co0.1 alloy was reduced. These analyses confirmed that substituting Fe with V in the TiFe0.8Mn0.2 alloy enhanced first hydrogenation kinetics while maintaining excellent effective hydrogen storage capacity.
{"title":"Microstructural feature and hydrogen storage properties of TiFe0.7Mn0.2X0.1 (X = V, Cr, Co, Ni, Cu) hydrogen storage alloy","authors":"Ryun-Ho Kwak, Sojin Jung, Tae-Yoon Park, Sung-Min Park, Hyung-Ki Park","doi":"10.1016/j.ijhydene.2025.02.476","DOIUrl":"10.1016/j.ijhydene.2025.02.476","url":null,"abstract":"<div><div>This study investigated the microstructural features and hydrogen storage properties of TiFe-based quaternary alloys, where Fe in the TiFe<sub>0</sub><sub>.</sub><sub>8</sub>Mn<sub>0.2</sub> alloy was additionally substituted with the transition metals of V, Cr, Co, Ni, and Cu (TiFe<sub>0</sub><sub>.</sub><sub>7</sub>Mn<sub>0.2</sub>X<sub>0.1</sub> (X = V, Cr, Co, Ni, Cu)). The TiFe<sub>0</sub><sub>.</sub><sub>8</sub>Mn<sub>0.2</sub> alloy exhibited a dual-phase microstructure consisting of the B2 and C14 Laves phases. The substitution of Fe with V, Cr, and Ni increased the Laves phase percentage, while the formation of the Laves phase was suppressed in alloys with Co and Cu substitutions. In all the alloys, a small amount of the Ti<sub>2</sub>Fe phase was precipitated. The room-temperature activation properties of the alloys were evaluated. The TiFe<sub>0</sub><sub>.</sub><sub>7</sub>Mn<sub>0</sub><sub>.</sub><sub>2</sub>Cr<sub>0.1</sub> alloy, with the highest Laves phase percentage, exhibited the fastest first hydrogenation kinetics, while the kinetics slowed as the Laves phase percentage decreased. The TiFe<sub>0</sub><sub>.</sub><sub>7</sub>Mn<sub>0</sub><sub>.</sub><sub>2</sub>Co<sub>0.1</sub> and TiFe<sub>0</sub><sub>.</sub><sub>7</sub>Mn<sub>0</sub><sub>.</sub><sub>2</sub>Cu<sub>0.1</sub> alloys, which did not form the Laves phase, displayed slower kinetics; however, the room-temperature activation was still achievable due to the formation of the Ti<sub>2</sub>Fe phase. The hydrogen storage properties of the alloys were examined. The TiFe<sub>0</sub><sub>.</sub><sub>7</sub>Mn<sub>0</sub><sub>.</sub><sub>2</sub>V<sub>0.1</sub> and TiFe<sub>0</sub><sub>.</sub><sub>7</sub>Mn<sub>0</sub><sub>.</sub><sub>2</sub>Co<sub>0.1</sub> alloys exhibited similar hydrogen absorption and desorption behaviors to the TiFe<sub>0</sub>.<sub>8</sub>Mn<sub>0.2</sub> alloy, while the other alloys showed steeper plateau pressure slopes. The effective hydrogen storage capacities were evaluated under conditions of hydrogen absorption up to 10 bar at 30 °C and hydrogen desorption down to 2 bar at 70 °C. The TiFe<sub>0</sub><sub>.</sub><sub>7</sub>Mn<sub>0</sub><sub>.</sub><sub>2</sub>V<sub>0</sub><sub>.</sub><sub>1</sub> alloy exhibited a similar effective hydrogen storage capacity to the TiFe<sub>0</sub><sub>.</sub><sub>8</sub>Mn<sub>0.2</sub> alloy, whereas the storage capacity of the TiFe<sub>0</sub><sub>.</sub><sub>7</sub>Mn<sub>0</sub><sub>.</sub><sub>2</sub>Co<sub>0.1</sub> alloy was reduced. These analyses confirmed that substituting Fe with V in the TiFe<sub>0</sub><sub>.</sub><sub>8</sub>Mn<sub>0.2</sub> alloy enhanced first hydrogenation kinetics while maintaining excellent effective hydrogen storage capacity.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"113 ","pages":"Pages 485-494"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552516","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}
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}
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