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PtCu subnanoclusters epitaxial on octahedral PtCu/Pt skin matrix as ultrahigh stable cathode electrocatalysts for room-temperature hydrogen fuel cells

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Nano research 2023年第2期16卷 2252-2258页

作者： Fengling Zhao Lirong Zheng Qiang Yuan Qinghua Zhang Tian Sheng Xiaotong Yang Lin Gu Xun Wang State-Local Joint Laboratory for Comprehensive Utilization of Biomass Center for R&D of Fine ChemicalsCollege of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Lab of Organic Optoelectronics&Molecular Engineering Tsinghua UniversityBeijing 100084China College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241000China Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics Beijing 100190China

Achieving stable surface structures of metal catalysts is an extreme challenge for obtaining long-term durability and meeting industrial application *** report a new class of metal catalyst,Pt-rich PtCu heteroatom subnanoclusters epitaxially grown on an octahedral PtCu alloy/Pt skin matrix(PtCu1.60),for the oxygen reduction reaction(Orr)in an acid *** PtCu1.60/C exhibits an 8.9-fold enhanced mass activity(1.42 A·mgPt^(−1))over that of commercial Pt/C(0.16 A·mgPt^(−1)).The PtCu1.60/C exhibits 140,000 cycles durability without activity decline and surface PtCu cluster stability owing to unique structure derived from the matrix and epitaxial growth pattern,which effectively prevents the agglomeration of clusters and loss of near-surface active *** characterization and theoretical calculations confirm that Pt-rich PtCu clusters favor Orr activity and thermodynamic *** room-temperature polymer electrolyte membrane fuel cells,the PtCu1.60/C shows enhanced performance and delivers a power density of 154.1/318.8 mW·cm^(−2)and 100 h/50 h durability without current density decay in an air/O_(2)feedstock.

关键词： epitaxial growth core–shell nanostructure PtCu alloy oxygen reduction reaction hydrogen fuel cells

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Fluoroethylene carbonate electrolyte additive for improved charge-discharge performance of Co-free high entropy spinel oxide anodes for lithium-ion batteries

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Ceramics International 2024年第16期51卷 22628-22638页

作者： Patra, Jagabandhu Nguyen, Thi Xuyen Panda, Ananya Ting, Jyh-Ming dhaka, rajendra S. Liu, Wei-ren Yang, Chun-Chen Chang, Jeng-Kuei Department of Materials Science and Engineering National Yang Ming Chiao Tung University 1001 University Road Hsinchu30010 Taiwan Research Center National Cheng Kung University 1 University Road Tainan70101 Taiwan Department of Materials Science and Engineering National Cheng Kung University 1 University Road Tainan70101 Taiwan Department of Physics Indian Institute of Technology Delhi Hauz Khas New Delhi110016 India Department of Chemical Engineering Chung Yuan Christian University 200 Chung Pei Road Taoyuan32023 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University 200 Chung Pei Road Taoyuan City32023 Taiwan Battery Research Center of Green Energy Ming Chi University of Technology 84 Gongzhuan Road New Taipei City243303 Taiwan Institute of Materials Science and Engineering National Central University 300 Jhong-Da Road Taoyuan32001 Taiwan

High entropy spinel oxide (HESO) materials have attracted interest as promising anode candidates for lithium-ion batteries (LIBs). Increasing the initial Coulombic efficiency (ICE), longevity, and rate capability of HESO is crucial. The performance of LIBs is heavily influenced by the characteristic of the solid-electrolyte interphase (SEI) formed on the electrode surface, which depends on the electrolyte composition. This study explores how modulating the concentration of fluoroethylene carbonate (FEC) in carbonate-based electrolyte affects the electrochemical properties of (MnFeNiCrCu)3O4 HESO anodes. Notably, the addition of 10 wt% FEC in the electrolyte significantly enhances HESO performance. With 10 wt% FEC, the electrode achieves impressive capacities of 806 and 630 mAh g−1 at 50 and 2000 mA g−1, respectively, with no noticeable capacity degradation after 400 cycles at 500 mA g−1. X-ray photoelectron spectroscopy (XPS) analysis indicates that 5 wt% FEC resulted in inferior passivation, leading to satisfactory performance. However, incorporating optimal FEC (10 wt%) achieves a balance of inorganic and organic SEI components, resulting in superior electrochemical properties. While the inorganic component provides great passivation, an excessive amount of LiF from higher FEC content (15 wt%) makes the SEI brittle and resistive, leading to its breakage during cycling and subsequent capacity decay. Our study offers important insights for improving the performance of HESO anodes for LIBs through electrolyte optimization. © 2024 Elsevier Ltd and Techna Group S.r.l.

关键词： Passivation

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Sulfonated Graphene Oxide Linked with Alkali Metal Ions membranes for Proton Conductivity in Hydrogen Production from Water Electrolysis

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SSrN 2024年

作者： Wei-Song, Hung Subrahmanya, T.M. Chi, Yang Jo Nayak, Smrutiranjan Abebe, Shalligito Habetamu Kadja, Grandprix T.M. Hu, Chien-Chieh Lee, Kueir-rarn Lai, Juin-Yih Advanced Membrane Materials Research Center Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan Bandung Institute of Technology Indonesia R&D Center for Membrane Technology Chung Yuan University Chung-Li32023 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan32023 Taiwan

Amid technological advances, rising energy demand, and environmental concerns, countries endorse green energy solutions. Prominent among them is hydrogen production via clean water electrolysis, a key strategy for sustainable development. Herein, to address the limitations of expensive and potentially harmful Nafion membranes, we have developed a new graphene oxide (GO) series membranes (hydrophilic sulfonated GO (GO-SO3H) linked with monovalent alkali metal ions were synthesized to fabricate the membranes) to be used in water electrolysis for hydrogen production by introducing the iodide oxidation reaction (IOr) as an alternative to the traditional oxygen evolution reaction (OEr). Various modifications by sulfuric acid, methanol, and different alkali metal hydroxides (LiOH, NaOH, KOH) result in membranes with distinct properties. Characterization techniques, including ATr-FTIr, SEM, AFM, Xrd, water contact angle (WCA), and electrochemical impedance spectroscopy (EIS), validated the modifications, assessed membrane morphology, interlayer spacing, hydrophilicity, and electrical properties. Among the membranes, GO-SO3K stood out, exhibiting the highest proton conductivity (119.16 mS) and superior potassium ion permeability (20.382 cm/s). Importantly, all GO series membranes demonstrate excellent stability in the electrochemical system. The findings suggested that GO-SO3K holds promise as a potassium ion-conductive membrane for efficient and sustainable hydrogen production, offering a viable alternative to conventional Nafion membranes in water electrolysis applications. © 2024, The Authors. All rights reserved.

关键词： Hydrogen production

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Construction of transfer-free regular through-pore polyimide composite microfiltration membranes via amphiphilic dendron-assisted breath-figure method for water treatment

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Separation and Purification Technology 2023年第1期327卷

作者： Hu, Chien-Chieh Fang, Jia-Ci Jeng, ru-Jong Wu, Chien-Hsin Huang, Ying-Chi Sun, Yi-Ming Lee, Kueir-rarn Lai, Juin-Yih Advanced Membrane Materials Research Center Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei106319 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Chungli32003 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Chungli32023 Taiwan

regular through-pore membranes exhibit extremely high productivity and size-selective capabilities. Previous studies have demonstrated that the use of a polymer alone on a solid substrate surface hinders the formation of regular through-pore membranes. In this study, amphiphilic dendrons were used as surfactants to concentrate the functional groups and strengthen the weak bonding forces between the molecules, which is conducive to the formation of regular through-pores in the membrane. The amphiphilic dendrons were mixed with commercial-grade polyimide (PI) using chloroform as the solvent, and the solution was evenly coated on the surface of the filter paper. Using the breath-figure method, an ultrathin regular through-pore PI layer was formed directly on the surface of the filter paper. The SEM image shows that regular through-pores were formed only on the surface of the substrate. The preparation process used in this study eliminates the need to transfer ultrathin and weak membranes to the substrate surface, which simplifies the membrane-making process. Pure water and yeast solution filtration tests were conducted on the composite membrane prepared with a 5 mg/ml dendron solution. A pure water permeance of 118,826 L m-2h−1 bar−1 (LMH/bar) was obtained, the yeast solution permeance and rejection are 17,410 LMH/bar and 92.85 %, respectively. The yellow, turbid, muddy water was successfully purified to clean water. The original performance of the fouled membrane was restored after only 30 s of water flushing. This study proposes a new approach to fabricate high-efficiency regular through-pore PI composite microfiltration membranes. © 2023 Elsevier B.V.

关键词： Microfiltration

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A Novel Clover-Like Cofs membrane Fabricated Via One-Step Interfacial Polymerization for dye/Salt Separation

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SSrN 2022年

作者： Fang, Yin-Xin Lin, Yu-Fei Xu, Zhen-Liang Mo, Jia-Wei Li, Ping-Ping State Key Laboratory of Chemical Engineering Membrane Science and Engineering R&D Lab Chemical Engineering Research Center School of Chemical Engineering East China University of Science and Technology 130 Meilong Road Shanghai200237 China

Covalent organic frameworks (COFs) membranes have exhibited great applications in wastewater treatment due to their highly ordered porous architecture. Currently, numerous studies have focused on the hexagonal-structured COFs synthesized with linear C2 and C3 precursor. However, the C2 monomer is limited-variety and high-cost. Herein, a novel clover-like structure COFs membrane is successfully fabricated for the first time. Meta-position monomer m-phenylenediamine (MPd) and 1,3,5-triformylbenzene (TFB) are used to synthesize the clover-like COFs membrane by interfacial polymerization (IP) method on the nylon substrate directly. The optimized MPd-TFB/Nylon membrane shows excellent water permeance of 94.4 L m-2 h-1 bar-1, which is higher than hexagonal-structured COFs membrane, in Congo red (Cr) and NaCl mixed solution The rejections are 98.6% for Cr and 2.9% for NaCl. This work opens a novel route for designing the COFs membrane with clover-like channels, manifesting the usage of linear C2 monomers is unnecessary. Besides, it has been found that the unique clover-like structure can improve the water molecular transport path under the same dye molecules deposition situation compared with hexagonal structure COFs membrane. © 2022, The Authors. All rights reserved.

关键词： membranes

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CFd Simulation and Experimental Verification of Protein Adsorption on Ni(Ⅱ) – HFM Module

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SSrN 2022年

作者： Wu, Jiaojie Wei, Yongming Li, Shuqin Zhou, Junjie Xu, Zhenliang State Key Laboratory of Chemical Engineering Membrane Science and Engineering R&D Lab Chemical Engineering Research Center School of Chemical Engineering East China University of Science and Technology 130 Meilong Road Shanghai200237 China

Immobilized metal affinity chromatography (IMAC) provides specific purification of proteins containing histidine tags through high affinity with transition metal chelators, which has various applications in biological protein separation. Most chromatographic separations currently use the fixed bed. In this form, the internal flow has a high pressure drop, uneven solution flow, and pore blockage, etc., which reduces the separation efficiency greatly. Therefore, this study uses hollow fiber membranes (HFM) with micron-scale inner diameters as the base, thus reducing the operating pressure and significantly enhancing the mass transmission. Batch adsorption experiments were performed using flat plate membranes to obtain the thermodynamic and kinetic model parameters of the reaction to use in the dynamic column breakthrough simulation. The numerical simulation was based on a single HFM model and established a mathematical model for computational fluid dynamics (CFd) in ANSYS Fluent. The model accuracy was validated by combining the simulation with experiments. The effects of different module and process parameters on the breakthrough curve was investigated by varying the parameters such as flow rate, initial feed concentration and HFM inner diameter. The design parameters and operating conditions contributing for the module utilization were obtained. © 2022, The Authors. All rights reserved.

关键词： Adsorption

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regulation of Surface Hydrophilicity in Amphiphilic dendron/Polyimide regular Through-Pore Composite membranes Via Grafting Modification for the development of Versatile Oil-Water Separation membranes

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SSrN 2025年

作者： Hu, Chien-Chieh Jeng, ru-Jong Sung, Cai-Syuan Wu, Chien-Hsin Huang, Ying-Chi Chang, Huai-Che Lee, Kueir-rarn Lai, Juin-Yih Advanced Membrane Materials Research Center Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei106319 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Chung Li32023 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Chungli32003 Taiwan

The rapid advancement of industrial processes has led to the substantial release of oily wastewater into the environment, posing a severe threat to ecological systems. Therefore, the development of highly efficient oil-water separation membranes is of critical importance. In this study, a casting solution was prepared by dissolving C18 polyurethane/malonamide dendron and polyimide (PI) in chloroform. This solution was then applied to the filter paper via drop-casting. The surface of the filter paper was subsequently treated using the breath-figure method, facilitating the formation of a regular through-pore composite membrane. The membrane surface incorporates azetidine-2,4-dione, a functional moiety presented in the C18 polyurethane/malonamide dendron, which undergoes a ring-opening reaction with primary amine-functionalized compounds. Hydrophilic branched polyethyleneimine (PEI) or hydrophobic octadecylamine can be covalently attached to the membrane surface, enabling the fabrication of membranes tailored for either oil-in-water or water-in-oil emulsion separation. This tunable surface chemistry, combined with the highly ordered through-pore structure, enables the development of versatile oil-water separation composite membranes with ultra-high permeance and excellent rejection. The degree of membrane hydrophilicity or hydrophobicity can be precisely modulated by adjusting parameters such as grafting density, molecular weight of the grafted compound, and reaction duration. Under optimized conditions, modification with branched polyethyleneimine (PEI 10000) for 6 h resulted in a membrane with high hydrophilicity and underwater superoleophobicity, achieving an oil-in-water emulsion permeance of 49,518.4 LMH/bar and a rejection of 99.1%. Conversely, the original regular through-pore composite membrane demonstrated a water-in-oil emulsion permeance of 380,520.8 LMH/bar with a rejection of 96.1%. These findings highlight the potential of integrating regular through-por

关键词： Grafting (chemical)

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Fabrication of Ag nanostar and PEI-based SErS substrate for sensitive and rapid detection of SO2: Application for detection of sulfite residues in beer

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Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy 2023年第1期302卷

作者： Leshe Kitaw, Sintayehu Fentahun darge, Haile dagnew Addisu, Kefyalew Thankachan, darieo Wondwosen Ahmed, Yohannis Sheng Chen, Yu Tegenu, Hailemichael Candra, Andy Wu, Tsung-Yun Gou, Yu-Xuan Tsai, Hsieh-Chih Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei 106 Taiwan Advanced Membrane Materials Center National Taiwan University of Science and Technology Taipei 106 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Taoyuan 320 Chungli Taiwan Department of Material Science and Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan

Because of sulfite's potential toxicity, there is a growing concern about detecting and controlling its concentration in foods, alcoholic beverages, pharmaceuticals, and environmental samples to ensure public health. A branched polyethyleneimine-coated silver nano-star (AgNS@PEI) surface-enhanced raman scattering (SErS) substrate was synthesized in this study for use as a sensitive, simple, rapid, stable, and reproducible non-destructible sulfite detection analytical technique. The seed morphology of the nano-star was created by using hydroxylamine (NH2OH) solution as a primary reducing agent, followed by a slow secondary reduction by trisodium citrate dihydrate (HOC(COONa)(CH2COONa)2 2H2O), resulting in the complete growth of the silver nano-star. For extra stability and selective absorption of sulfur dioxide from the headspace extraction of SO2 from sulfites, the nano-stars were thin coated with branched polyethyleneimine (b-PEI). The results showed that the thin-coated plasmonic substrates selectively absorb sulfur dioxide molecules, allowing sulfites in beer samples to be detected with a detection limit of 0.48 mg/L. Furthermore, the PEI-coated silver nano-star demonstrated increased stability and reproducibility, allowing for longer use of the substrate. recovery experiments with recovery rates ranging from 95 to 112% and relative standard deviations ranging from 1.55 to 8.1% demonstrated that headspace extraction, selective SO2 absorption by the synthesized substrate, and subsequent SErS detections were reliable and valid for practical applications. Finally, this study developed an SO2-sensitive, selective, and robust Si@AgNS@PEI substrate for effective SErS detection and monitoring of sulfite levels in real-world environmental samples. © 2023

关键词： Surface scattering

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rock mass joint set identification at draa Sfar mine in Morocco through stereographic projection and K-means clustering

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Mediterranean Geoscience reviews 2024年第1期6卷 49-56页

作者： Clero, Kaoutar Ed-diny, Said Achalhi, Mohammed Cherkaoui, Mouhamed Benzakour, Intissar Soror, Tarik rziki, Said El Fkihi, Sanaa Nadour, Mohamed Tagemouati, Hicham Bourzeix, François National School of Mines of Rabat (ENSMR) Hadj Ahmed Cherkaoui Avenue Agdal Rabat Morocco Moroccan Foundation for Advanced Science Innovation and Research (MASCIR) Mohamed Al Jazouli Street Madinat Al Irfane Rabat Morocco REMINEX Engineering R&D and Project Management BP 469 Marrakech Morocco National School of Computer Science and Systems Analysis (ENSIAS) IRDA Team Rabat IT Center ADMIR Lab Université Mohammed V Rabat Morocco

rock mass joint set identification, crucial for geological and geotechnical studies, is often based on stereographic projection. However, the related software programs can eventually present some access limitations. Therefore, with the development of the Artificial Intelligence field and the sharp increase in Machine Learning and deep Learning applications, this study aims to suggest an alternative solution for rock mass joint sets identification based on the K-means clustering algorithm, an unsupervised Machine Learning model that aims to structure unlabeled data into different clusters based on their patterns. The study includes a comparative analysis of joint set clustering using the K-means model and the stereographic projection. The two methods are applied to the structural data of the draa Sfar deep underground mine in Morocco. The results show the concordance of the joint set clustering using both stereographic projection and the K-means model, highlighted by the mean dip and dip direction obtained values. This concordance confirms that K-means clustering allows identifying rock mass joint sets if access to stereographic projection automated tools is limited. However, using K-means clustering for this purpose requires applying preprocessing methods such as the elbow method or the silhouette score to identify the clusters' number previously. In conclusion, unsupervised learning can be an alternative for identifying rock mass joint sets as long as enough and suitable structural data are accessible. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Artificial intelligence K-means clustering rock mass joint set Stereographic projection Structural geology Unsupervised learning

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Investigating the impact of metal ion variations in terephthalate metal–organic frameworks on the organic solvent nanofiltration performance of mixed matrix membranes

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Journal of membrane science 2024年 700卷

作者： Ajebe, Eyasu Gebrie Hu, Chien Chieh Lugito, Graecia Hu, Chun-Po Hung, Wei-Song Lee, Kueir-rarn Lai, Juin-Yih Graduate Institute of Applied Science and Technology Advanced Membrane Materials Research Center National Taiwan University of Science and Technology Taipei Taiwan Chemical Engineering Study Program Faculty of Industrial Technology Institut Teknologi Bandung West Java Indonesia Nanyang Technological University 1 Cleantech Loop Singapore R&D Center for Membrane Technology Chung Yuan University Chungli Taoyuan Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chungli Taoyuan Taiwan

Nano-fillers integrated into mixed matrix membranes (MMMs) present promising alternatives for organic solvent nanofiltration (OSN). In this work, our objective is to enhance OSN performance by incorporating terephthalate metal-organic frameworks (M-BdC, where M = Zr or Cu) into a P84 matrix to fabricate M-BdC/P84 composite MMMs. This work focuses on the influence of metal cluster variation on particle size, pore size distribution, and specific surface area of M-BdC, while systematically investigating the impact of M-BdC addition on OSN performance and underlying separation mechanisms. The synthesized membranes underwent comprehensive characterization using SEM, Xrd, ATr-FTIr, contact angle, zeta potential, and thermogravimetric analysis. Significantly, all MMMs exhibited superior permeance and methyl blue (MB) rejection compared to P84 membranes. This enhancement is attributed to the improved interfacial contact between M-BdC and P84, as well as their effective dispersion within the membrane matrix. Interestingly, comparative analysis between Cu-BdC/P84 and Zr-BdC/P84 MMMs revealed the latter's superior permeance, attributed to its larger pore size and surface area. The resulting MMMs demonstrated outstanding MB rejection (>96.7%) with ethanol permeance of 21.5 and 19.0 LMH/Bar for Zr-BdC/P84 and Cu-BdC/P84 MMMs, respectively. Furthermore, the stable performance of M-BdC-based MMMs during prolonged MB/ethanol operation underscores their potential significance in the field of OSN, providing valuable insights for future membrane design and application. © 2024 Elsevier B.V.

关键词： Organometallics

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