A quaternary alloy （Al-5.0Cu-0.35Mn-0.25Ti, wt.%）, having a similar chemical component with ZL205A, was prepared using a controlled diffusion solidification （CDS） process and a conventional casting process. The ef...A quaternary alloy （Al-5.0Cu-0.35Mn-0.25Ti, wt.%）, having a similar chemical component with ZL205A, was prepared using a controlled diffusion solidification （CDS） process and a conventional casting process. The effect of the casting process on microstructure and hardness was investigated. The grain morphology and casting defects of the al oy prepared via the conventional casting and CDS were observed and compared at various pouring temperatures. Results show that the CDS process can al eviate the hot tearing defects and reduce the density of porosity, while getting rid of the riser that is general y used for feeding during conventional casting. Structure observations show that the grain morphology of the conventional cast al oy is mainly dendritic, and the grain size decreases when the pouring temperature is decreased, while the CDS cast al oy consists of a large number of spherical grains, which can decrease the thermal cracking tendency and segregation defect, and enhance the hardness of the alloy.展开更多
Metal-supported solid oxide fuel cells(MS-SOFCs)have recently gained significant attention as an advanced SOFC technology,owing to their excellent mechanical robustness,ease of handling,and high manufacturability.The ...Metal-supported solid oxide fuel cells(MS-SOFCs)have recently gained significant attention as an advanced SOFC technology,owing to their excellent mechanical robustness,ease of handling,and high manufacturability.The use of metal substrates enables improved durability under thermal and redox cycling,and allows for thinner electrolyte layers,contributing to enhanced performance.However,their fabrication typically requires high-temperature sintering to ensure adequate material properties and adhesion,as most SOFC components are ceramic.These high-temperature processes can lead to undesirable effects,including metal support oxidation,chemical side reactions,and accelerated particle growth,which degrade cell performance.This study introduces an ultra-fast sintering approach for MS-SOFC fabrication by directly integrating stainless-steel metal supports with nickel-yttria-stabilized zirconia(Ni-YSZ)composite anode active layers.The application of flash light sintering-an innovative ultra-fast technique-effectively suppressed Ni catalyst particle growth,expanding the electrochemical reaction area while minimizing material diffusion between the metal support and anode layer.As a result,the fabricated cells achieved a stable open-circuit voltage(OCV)exceeding 1 V at 650℃ and a peak power density of 412 mW/cm^(2),representing an approximately 426.3% performance improvement over conventionally sintered cells.This research presents a transformative strategy for SOFC manufacturing,addressing the challenges of conventional long-duration heat treatments and demonstrating significant potential for advancing energy conversion technologies.展开更多
Structural manipulation of graphene oxide (GO) building blocks has been widely researched. Concerning GO membranes for separation applications, the validity and maintenance of their microscopic structures in the chemi...Structural manipulation of graphene oxide (GO) building blocks has been widely researched. Concerning GO membranes for separation applications, the validity and maintenance of their microscopic structures in the chemical environment are pivotal for effective separation at the molecular scale. Cationic interactions with both aromatic rings and oxygenated functional groups of GO make metal ions intriguing for physically and chemically structural reinforcement. By filtrating GO suspension through the substrate loaded with cations, stacking o f GO nanosheets and diffusion of cations steadily evolve simultaneously in an aqueous environment without flocculation. Thus, thin and homogeneous GO membrane is obtained. Divalent and monovalent cations were studied regarding their interactions with GO, and the performance of correspondingly functionalized membranes was evaluated. The divalent cation-stabilized membranes have favorable stability in the separation of water/ethanol. This facile fabrication and functionalization method may also be applicable for structure construction of other two-dimensional materials.展开更多
文摘A quaternary alloy （Al-5.0Cu-0.35Mn-0.25Ti, wt.%）, having a similar chemical component with ZL205A, was prepared using a controlled diffusion solidification （CDS） process and a conventional casting process. The effect of the casting process on microstructure and hardness was investigated. The grain morphology and casting defects of the al oy prepared via the conventional casting and CDS were observed and compared at various pouring temperatures. Results show that the CDS process can al eviate the hot tearing defects and reduce the density of porosity, while getting rid of the riser that is general y used for feeding during conventional casting. Structure observations show that the grain morphology of the conventional cast al oy is mainly dendritic, and the grain size decreases when the pouring temperature is decreased, while the CDS cast al oy consists of a large number of spherical grains, which can decrease the thermal cracking tendency and segregation defect, and enhance the hardness of the alloy.
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(RS-2024-00395914)the Korea Institute of Energy Technology Evaluation and Planning(KETEP)granted financial resource from the Ministry of Trade,Industry&Energy,Republic of Korea(20213030030040 and 20212020800090).
文摘Metal-supported solid oxide fuel cells(MS-SOFCs)have recently gained significant attention as an advanced SOFC technology,owing to their excellent mechanical robustness,ease of handling,and high manufacturability.The use of metal substrates enables improved durability under thermal and redox cycling,and allows for thinner electrolyte layers,contributing to enhanced performance.However,their fabrication typically requires high-temperature sintering to ensure adequate material properties and adhesion,as most SOFC components are ceramic.These high-temperature processes can lead to undesirable effects,including metal support oxidation,chemical side reactions,and accelerated particle growth,which degrade cell performance.This study introduces an ultra-fast sintering approach for MS-SOFC fabrication by directly integrating stainless-steel metal supports with nickel-yttria-stabilized zirconia(Ni-YSZ)composite anode active layers.The application of flash light sintering-an innovative ultra-fast technique-effectively suppressed Ni catalyst particle growth,expanding the electrochemical reaction area while minimizing material diffusion between the metal support and anode layer.As a result,the fabricated cells achieved a stable open-circuit voltage(OCV)exceeding 1 V at 650℃ and a peak power density of 412 mW/cm^(2),representing an approximately 426.3% performance improvement over conventionally sintered cells.This research presents a transformative strategy for SOFC manufacturing,addressing the challenges of conventional long-duration heat treatments and demonstrating significant potential for advancing energy conversion technologies.
基金financially supported by the National Natural Science Foundation of China (21476107, 21490585, 21776125 and 51861135203)the Innovative Research Team Program by the Ministry of Education of China (IRT17R54)the Topnotch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)
文摘Structural manipulation of graphene oxide (GO) building blocks has been widely researched. Concerning GO membranes for separation applications, the validity and maintenance of their microscopic structures in the chemical environment are pivotal for effective separation at the molecular scale. Cationic interactions with both aromatic rings and oxygenated functional groups of GO make metal ions intriguing for physically and chemically structural reinforcement. By filtrating GO suspension through the substrate loaded with cations, stacking o f GO nanosheets and diffusion of cations steadily evolve simultaneously in an aqueous environment without flocculation. Thus, thin and homogeneous GO membrane is obtained. Divalent and monovalent cations were studied regarding their interactions with GO, and the performance of correspondingly functionalized membranes was evaluated. The divalent cation-stabilized membranes have favorable stability in the separation of water/ethanol. This facile fabrication and functionalization method may also be applicable for structure construction of other two-dimensional materials.
