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Influence of pore size optimization in catalyst layer on the mechanism of oxygen transport resistance in PEMFCs

Progress in Natural Science:materials International 2020年第6期30卷 839-845页

作者： Shumeng Guan Fen Zhou Jinting Tan Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Provincial Key Laboratory of Fuel Cells Wuhan University of Technology

In PEMFC, the oxygen transport resistance severely hinders the cell from achieving high performance. In this paper, pore-forming agent was used to optimize the pore size distribution of the catalyst layer(CL), and to study its effect on the mechanism of oxygen transport resistance, including molecular diffusion resistance, Knudsen diffusion resistance, and local O2resistance in CL. The results showed that with the pore formation the cell performance had a significant improvement at high current density, mainly due to its better oxygen transport properties, especially under low platinum conditions. The addition of pore-forming agent moved the pore diameter toward a larger pore diameter with a range from 70 to 100 nm, and also obtaining a higher cumulative pore volume. It was found that the increase of the cumulative pore volume and larger pore size were conducive to the diffusion of oxygen molecules in CL, and the resistance caused by which was the dominant part in total transport resistance. Further tests indicated that the improvement of molecular diffusion resistance was much larger than that of Knudsen diffusion resistance in the catalyst layer after pore formed. In addition, the optimized pore structure will also get a higher number of effective pores, which resulted in an increased effective area of the ionomer on the Pt surface. The higher effective area of the ionomer was particularly beneficial for the reduction of local O2resistance with low Pt loading.

关键词： Pore size optimization Pore-forming agent Oxygen transport resistance PEMFC

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Effect of Particle Size on Silicon Nitride Ceramic Slurry by Stereolithography

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Journal of Wuhan University of technology(materials Science) 2023年第3期38卷 514-519页

作者：汪春柳 ZHANG Jinyong 雷丽文 School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070China

The effects of particle size,gradation and solid loading of silicon nitride (Si_(3)N_(4)) on the rheological behavior and curing properties of ceramic slurry are studied by stereolithography (SLA).The results show that the particle size of Si_(3)N_(4) powder has a signif icant influence on the rheological properties and stability of the *** m_(D50=1.3μm):m_(D50=2.3μm)=3:7,the slurry viscosity is low and the sedimentation is *** most important thing is that with the increase of the solid loading of the slurry,the viscosity of the slurry increases,the stability becomes higher,and the curing thickness *** curing thickness of Si_(3)N_(4) ceramic slurry with solid loading of 50 vol% can reach nearly 50μ*** above results finally show that the process optimizes the formulation of the slurry in rheological and curing properties.

关键词： silicon nitride stereolithography dispersion stability

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Functionalized carbon nanotubes interconnected with metal-organic frameworks for in-situ solar-driven evaporation and salt recovery from seawater

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Water Research 2025年 282卷 123643页

作者： Asghar, Muhammad Sohail Irshad, Muhammad Sultan Arshad, Naila Huwayz, Maryam Al Alomar, Muneerah Maqsood, Ghazala Ali, Muhammad Atif Ghanzanfar, Uzma Sabir, Muhammad Li, Jinhua Dao, Van-Duong Ho, Nang Xuan Wang, Xianbao Guo, Zhiguang Ministry of Education Key Laboratory of Green Preparation and Application for Functional Materials School of Materials Science and Engineering Hubei University Wuhan430062 China Ministry of Education Key Laboratory of Green Preparation and Application for Functional Materials School of New Energy and Electrical Engineering Hubei University Wuhan430062 China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen518060 China Department of Physics College of Science Princess Nourah bint Abdulrahman University P. O. Box 84428 Riyadh11671 Saudi Arabia Department of Physics University of Wah Wah Cantt47040 Pakistan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Faculty of Biotechnology Chemistry and Environmental Engineering Phenikaa University Hanoi100000 Viet Nam Faculty of Vehicle and Energy Engineering PHENIKAA University Hanoi Viet Nam

Innovative solutions are needed to meet global water demand and to ensure the sustainable management of saline water resources. Indeed, solar-driven interfacial evaporation systems hold great environmental significance as they offer a sustainable and eco-friendly solution to several pressing issues. Herein, a 3D umbrella-shaped hybrid solar evaporator is innovatively developed by functionalized carbon nanotubes interlinked with metal-organic framework (MOF) nanocubes ZIF-67@CNT is sequentially anchored on cotton fabric with a centralized water supply. Combining these two materials results in a remarkable synergy, where the MOFs may trap and release water molecules (5.75 gg-1), and the CNTs facilitate broadband solar absorption (95 %). The hybrid solar evaporator endows solitary heat accumulation (49.5 °C) under 1k Wm-2 solar irradiance owing to its effective thermal management supported by centralized wicks-inspired water supply as compared to the conventional direct contact structures. More importantly, an efficient evaporation rate (2.1 kg m-2 h-1) was achieved, along with 99.9 % rejection efficacy and sustained reproducibility under natural conditions. Meanwhile, the system effectively concentrates and recovers salts from the brine stream, reducing waste and minimizing environmental impact. The sustainable utilization of solar energy reduces the energy cost associated with desalination, contributing to the economic viability of this technology. © 2025 Elsevier Ltd

关键词： Seawater

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Au23（CR）14 nanocluster restores fibril Aβ's unfolded state with abolished cytotoxicity and dissolves endogenous Aβplaques

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National Science Review 2020年第4期7卷 763-774页

作者： Wenkang Zhang Guanbin Gao Zhongjie Ma Zhuoying Luo Meng He Taolei Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology

The misfolding of amyloid-β（Aβ） peptides from the natural unfolded state to β-sheet structure is a critical step, leading to abnormal fibrillation and formation of endogenous Aβ plaques in Alzheimer's disease（AD）. Previous studies have reported inhibition of Aβ fibrillation or disassembly of exogenous Aβ fibrils in vitro. However, soluble Aβ oligomers have been reported with increased cytotoxicity; this might partly explain why current clinical trials targeting disassembly of Aβ fibrils by anti-Aβ antibodies have failed so *** we show that Au23（CR）14(a new Au nanocluster modified by Cys-Arg（CR） dipeptide) is able to completely dissolve exogenous mature Aβ fibrils into monomers and restore the natural unfolded state of Aβ peptides from misfolded β-sheets. Furthermore, the cytotoxicity of Aβ40fibrils when dissolved by Au23（CR）14is fully abolished. More importantly, Au23（CR）14is able to completely dissolve endogenous Aβ plaques in brain slices from transgenic AD model mice. In addition, Au23（CR）14has good biocompatibility and infiltration ability across the blood–brain barrier. Taken together, this work presents a promising therapeutics candidate for AD treatment, and manifests the potential of nanotechnological approaches in the development of nanomedicines.

关键词： gold nanoclusters Alzheimer’s disease restores fibril Aβ’s unfolded state abolished cytotoxicity dissolves endogenous Aβ plaques

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A few-shot deep learning framework for predicting high-velocity impact response of ultra-high molecular weight polyethylene fiber-reinforced composites

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Aerospace Science and technology 2025年 163卷

作者： Ji, Haibo Zhang, Yongqian Wang, Xin Qin, Liutong Yue, Zengshen Li, Bingyang Li, Zhen Meng, Han Wang, Pengfei Zhang, Rui Lu, Tian Jian State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China Advanced Materials and Energy Center China Academy of Aerospace Science and Innovation Beijing100088 China Shanghai Aerospace Control Technology Institute Shanghai201109 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Hom Hong Kong Kowloon999077 China College of Engineering Peking University Beijing100871 China

Ultra-high molecular weight polyethylene (UHMWPE) fiber-reinforced composites have been extensively employed in aerospace situations requiring outstanding impact resistance. In real scenarios, high-velocity impactors may strike the UHMWPE laminates from diverse angles, possibly resulting in unpredictable protection performance changes. However, when considering this issue, existing experimental and simulation methods are resource-intensive, while theoretical approaches lack broad applicability. To this end, this study establishes a deep learning framework, trained on a small dataset, to predict not only the ballistic limit but also the penetration process of the UHMWPE composite plates subjected to oblique impact by flat-nosed projectiles. The effectiveness of the deep learning model is fully validated by both experimental observations and numerical simulations. It is demonstrated that the model consisting of CNN, BiLSTM, and Attention mechanism captures the ballistic limit velocities, contact force histories, and residual velocity evolutions with a reasonable correlation (i.e., the average R² ≥ 0.97) using only 30 samples, addressing the challenge of limited experimental data in ballistic research. Additionally, the prediction time of the current model is significantly reduced to 20.7 s, compared to the hours required for conventional experimental or computational efforts. Based on the model, it is indicated that for the UHMWPE composites of any thickness, the ballistic limit initially decreases and then increases with the impact angle;the physical mechanism underlying this non-monotonic trend is attributed to the nonlinear variation in the contact force histories. Overall, by revealing the mechanisms governing angle-dependent ballistic performance, this paper provides a novel data-driven approach and new physical insights for optimizing impact-resistance materials and structures based on the UHMWPE composites. © 2025

关键词： Fiber reinforced plastics

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Rapid fabrication and thermoelectric performance of SnTe via non-equilibrium laser 3D printing

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Rare Metals 2018年第4期37卷 300-307页

作者： Tian-Le Chen Chuang Luo Yong-Gao Yan Ji-Hui Yang Qing-Jie Zhang Ctirad Uher Xin-Feng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Materials Science and Engineering University of Washington Department of Physics University of Michigan

Thermoelectric technologies based on Seebeck and Peltier effects, as energy techniques able to directly convert heat into electricity and vice versa, hold promise for addressing the global energy and environmental problems. The development of efficient and low-cost thermo- electric modules is the key to their large-scale commercial applications. In this paper, using a non-equilibrium laser 3D printing technique, we focus an attention on the fabrication of mid-temperature p-type SnTe thermoelectric materials. The influence of laser power, scanning speed and layer thickness on the macro-defects, chemical and phase composition, microstructure and thermoelectric performance was systematically investigated. First and foremost, the processing parameter window for printing a highquality layer is determined. This is followed by the finite element method used to simulate and verify the influence of the laser-induced molten pool temperature distribution on the final composition and microstructure. Finally, the high-performance SnTe layer with 10 mm × 10 mm in area is produced within seconds with room temperature Seebeck coefficient close to that of SnTe manufactured by the traditional methods. Consequently, this work lays a solid foundation for the future fabrication of thermoelectric modules using laser non-equilibrium printing techniques.

关键词： Selective laser melting Laser non-equilibriumheating SnTe compound Thermoelectric performance

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Study on the thermodynamics and kinetics in the combustion reaction between titanium and boron powders

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key Engineering materials 2007年 351卷 189-194页

作者： Wang, K. Fu, Z.Y. Wang, W.M. Wang, Y.C. Wang, H. Zhang, J.Y. Zhang, Q.J. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Combustion synthesis of titanium diboride(TiB2) from titanium(Ti) and boron(B) powders was studied by theoretical calculation and experimental analysis. In high temperature range or in low temperature range, the calculated activation energies are 140KJ/mol or 355KJ/mol respectively, which is described by a change from dissolution-precipitation controlled process to diffusion-controlled process. With the increase of particle size of the raw materials, combustion temperature and propagating rate will both reduce. The propagating rate decreases with the addition of diluents. Further increase of diluents may result in a stop of the combustion wave halfway or even a failure of ignition.

关键词： Reaction kinetics

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Preparation of Nano-sized Zirconium Carbide Powders through a Novel Active Dilution Self-propagating High Temperature synthesis Method

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Journal of Wuhan University of technology(materials Science) 2015年第4期30卷 729-734页

作者：达奥运龙飞 WANG Jilin XING Weihong WANG Yang ZHANG Fan 王为民 FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Lab of New Processing Technology for Nonferrous Metals & Materials Ministry of Education China Guilin University of Technology

High quality nano-sized zirconium carbide （ZrC） powders were successfully fabricated via a developed chemical active dilution self-propagating high-temperature synthesis （SHS） method assisted by ball milling pretreatment process using traditional cheap zirconium dioxide powder （ZrO2）, magnesium powder （Mg） and sucrose （C12H22Oll） as raw materials. FSEM, TEM, HRTEM, SAED, XRD, FTIR and Raman, ICP- AES, laser particle size analyzer, oxygen and nitrogen analyzer, carbon/sulfur determinator and TG-DSC were employed for the characterization of the morphology, structure, chemical composition and thermal stability of the as-synthesized ZrC samples. The as-synthesized samples demonstrated high purity, low oxygen content and evenly distributed ZrC nano-powders with an average particle size of 50nm. In addition, the effects of endothermic rate and the possible chemical reaction mechanism were also discussed.

关键词： zirconium carbide ZrC self-propagating high-temperature synthesis active dilution nano-powders ball milling

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Enhanced performance of solid-state Li–O_2 battery using a novel integrated architecture of gel polymer electrolyte and nanoarray cathode

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Rare Metals 2018年第6期37卷 527-535页

作者： Liang Xiao Er-Wei Li Jing-Yu Yi Wen Meng Bo-Hua Deng Jin-Ping Liu School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The present work proposes a novel strategy to fabricate an integrated architecture of gel polymer electrolyte （GPE）-nanoarray cathode for lithium-O2 batteries （LOBs）. As a proof-of-concept experiment, the photo-initiated in situ polymerization of GPE was carried out via incorporating the precursor solution in advance into a self- standing binder-free oxygen electrode of Co3O4 nanosheets array grown on carbon cloth （Co3O4@CC）, forming an integrated GPE-Co3O4@CC architecture. The performance of the solid-state LOBs using the GPE-Co3O4@CC assembly is greatly enhanced compared to the counterparts with a traditional cell structure, in which GPE was sandwiched by a lithium metal and a cathode. The enhanced performance is ascribed to the combination of the in situ polymerization of GPE and the versatile structure of nanoarray electrode, which results in abundant interfacial contacts between GPE and electrode. This work presents an alternative way to develop high-performance solid-state LOBs by combining the advantages of both gel polymer electrolytes and nanoarray electrodes.

关键词： Solid-state Li-O2 battery Gel polymer electrolyte Co3O4 nanosheet Nanoarray electrode Electrolyte-cathode interface

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Ultra-Thin Carbon-Doped Bi_(2)WO_(6) Nanosheets for Enhanced Photocatalytic CO_(2) Reduction

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Transactions of Tianjin University 2021年第4期27卷 338-347页

作者： Han Li Junchao Zhang Jiaguo Yu Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The photocatalytic reduction of CO_(2) is a promising strategy to generate chemical ***,this reaction usually suf-fers from low photoactivity because of insuffi cient light absorption and rapid charge *** engineering has become an eff ective approach to improve the photocatalytic ***,ultra-thin(~4.1 nm)carbon-doped Bi_(2)WO_(6) nanosheets were prepared via hydrothermal treatment followed by *** ultra-thin nanosheet structure of the cata-lyst not only provides more active sites but also shortens the diff usion distance of charge carriers,thereby suppressing charge ***,carbon doping could successfully extend the light absorption range of the catalyst and remarkably promote charge separation,thus inhibiting *** a result,the as-prepared Bi_(2)WO_(6) photocatalyst with ultra-thin nanosheet structure and carbon doping exhibits enhanced photocatalytic CO_(2) reduction performance,which is twice that of pristine ultra-thin Bi_(2)WO_(6) *** study highlights the importance of defect engineering in photocatalytic energy conversion and provides new insights for fabricating effi cient photocatalysts.

关键词： Defect engineering Bi_(2)WO_(6)nanosheet Charge separation Light absorption

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