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Nano Research 2020年第11期13卷 2925-2932页

作者： Xiongyi Liang Xiangxuan Deng Chen Guo chi-man lawrence wu Department of Materials Science and Engineering City University of Hong KongHong KongChina

Conversion of inert N2 molecules into NH3 via electrochemical methods is an environmentally friendly alternative to replace the traditional Haber-Bosch ***,the development of highly efficient catalyst is still ***,we report a density functional theory(DFT)based high-throughput screening to investigate the potential of 23 atomic transition metals(Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,Y,Zr,Nb,Mo,Tc,Ru,Rh,Pd,Ag,Cd,W,Pt and Au)supported on phosphorene monolayer as electrocatalyst for nitrogen reduction reaction(NRR).Our theoretical results demonstrate that V single atom anchoring on phosphorene monolayer exhibits good thermal stability,selectivity and excellent catalytic activity with a low overpotential of 0.18 ***,rational design principles and electronic descriptor between the intrinsic electronic properties and activation barrier have been *** work offers a new promising noble metal-free catalyst for NRR and reveals profound insights into the activity origin to guide further design.

关键词： high-throughput screening density functional theory phosphorene electronic descriptor single atomic catalyst transition metal

Morphology and strain control of hierarchical cobalt oxide nanowire electrocatalysts via solvent effect

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Nano Research 2020年第11期13卷 3130-3136页

作者： Xiuming Bu Xiongyi Liang Kingsley O.Egbo Zebiao Li You Meng Quan Quan Yang Yang Li Kin man Yu chi-man lawrence wu Johnny C.Ho Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SARChina Department of Physics City University of Hong KongKowloonHong KongKowloonHong Kong SARChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SARChina

Designing highly efficient and low-cost electrocatalysts for oxygen evolution reaction is important for many renewable energy *** particular,strain engineering has been demonstrated as a powerful strategy to enhance the electrochemical performance of catalysts;however,the required complex catalyst preparation process restricts the implementation of strain ***,we report a simple self-template method to prepare hierarchical porous Co_(3)O_(4)nanowires(PNWs)with tunable compressive strain via thermal-oxidation-transformation of easily prepared oxalic acid-cobalt nitrate(Co(NO_(3))_(2))composite *** on the complementary theoretical and experimental studies,the selection of proper solvents in the catalyst preparation is not only vital for the hierarchical structural evolution of Co_(3)O_(4) but also for regulating their compressive surface *** of the rich surface active sites and optimized electronic Co d band centers,the PNWs exhibit the excellent activity and stability for oxygen evolution reaction,delivering a low overpotential of 319 mV at 10 mA·cm^(−2)in 1 M KOH with a mass loading 0.553 mg·cm^(−2),which is even better than the noble metal catalyst of RuO_(2).This work provides a cost-effective example of porous Co_(3)O_(4)nanowire preparation as well as a promising method for modification of surface strain for the enhanced electrochemical performance.

关键词： hierarchical structure morphology control compressive strain solvent effect oxygen evolution reaction

Inducing Fe 3d Electron Delocalization and Spin‑State Transition of FeN_(4) Species Boosts Oxygen Reduction Reaction for Wearable Zinc–Air Battery

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Nano-Micro Letters 2023年第4期15卷 23-39页

作者： Shengmei Chen Xiongyi Liang Sixia Hu Xinliang Li Guobin Zhang Shuyun Wang Longtao Ma chi‑man lawrence wu Chunyi Zhi Juan Antonio Zapien Department of Materials Science and Engineering City University of Hong KongHong Kong 999077People’s Republic of China Sustech Core Research Facilities Southern University of Science and Technology1088 Xueyuan BlvdShenzhenGuangdong 518055People’s Republic of China Frontiers Science Center for Flexible Electronics Institute of Flexible ElectronicsNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhenGuangdong518055People’s Republic of China

Transition metal-nitrogen-carbon materials(M-N-Cs),particularly Fe-N-Cs,have been found to be electroactive for accelerating oxygen reduction reaction(ORR)*** substantial efforts have been devoted to design Fe-N-Cs with increased active species content,surface area,and electronic conductivity,their performance is still far from ***,there is limited research about regulation on the electronic spin states of Fe centers for Fe-N-Cs electrocatalysts to improve their catalytic ***,we introduce Ti_(3)C_(2) MXene with sulfur terminals to regulate the electronic configuration of FeN_(4) species and dramatically enhance catalytic activity toward *** MXene with sulfur terminals induce the spin-state transition of FeN_(4) species and Fe 3d electron delocalization with d band center upshift,enabling the Fe(II)ions to bind oxygen in the end-on adsorption mode favorable to initiate the reduction of oxygen and boosting oxygen-containing groups adsorption on FeN_(4) species and ORR *** resulting FeN_(4)-Ti_(3)C_(2)Sx exhibits comparable catalytic performance to those of commercial *** developed wearable ZABs using FeN_(4)-Ti_(3)C_(2)Sx also exhibit fast kinetics and excellent *** study confirms that regulation of the electronic structure of active species via coupling with their support can be a major contributor to enhance their catalytic activity.

关键词： Fe 3d electron delocalization Spin-state transition Oxygen reduction reaction Wearable zinc-air batteries

Theoretical Insight into Organic Dyes Incorporating Triphenylamine-Based Donors and Binary π-Conjugated Bridges for Dye-Sensitized Solar Cells

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Theoretical Insight into Organic Dyes Incorporating Tripheny...

Compression Creep Behavior of High Volume Fraction of SiC Particles Reinforced Al Composite Fabricated by Pressureless Infiltration

第一届新型太阳能电池暨钙钛矿太阳能电池学术研讨会

作者： Yang Shao Shuxian Wei Xiaoqing Lu Xiaofan Shi Zhigang Deng Zigang Zhao Lianming Zhao Wenyue Guo chi-man lawrence wu College of Science China University of Petroleum Department of Physics and Materials Science City University of Hong Kong

The design of light-absorbent sensitizers with sustainable and environment-friendly material is one of the key issues for the future development of dye-sensitized solar cells(DSSCs). In our work, a series of organic sensitizers incorporating alkoxy-substituted triphenylamine(tpa) donors and binary π-conjugated bridges were investigated using density functional theory(DFT) and time-dependent DFT(TD-DFT). Molecular geometry, electronic structure, and optical absorption spectra are analyzed in the gas phase, chloroform and dimethylformamide(DMF) solutions. Our results show that properly choosing the heteroaromatic atoms and/or adding one more alkoxy-substituted tpa group can fine adjust the molecular orbital energy. The solvent effect renders the HOMO-LUMO gaps of the tpa-based sensitizers decrease in the sequence of DMF solution < chloroform solution < gas phase. The absorption spectra are assigned to the ligand-to-ligand charge transfer(LLCT) characteristics via transitions mainly from tpa, 3,4-ethylenedioxythiophene(edot) and alkyl-substituted dithienosilole(dts) groups to edot, dts and cyanoacrylic acid groups. The binary π-conjugated bridges play different roles in balancing the electron transfer and recombination for the different tpa-based sensitizers. The protonation/deprotonation effect has great effect on the HOMO-LUMO gaps, and thus has great influence on the bands at the long wavelength region, but little influence on the bands at the short wavelength region.

关键词： organic dyes triphenylamine(tpa)-based donors binary π-conjugated bridges theoretical investigation

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chinese Journal of Aeronautics 2007年第2期20卷 115-119页

作者： XU Fu-min wu lawrence chi-man HAN Guang-wei TAN Yi State Key Laboratory of Materials Modification by Laser Ion and Electron Beams School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Department of Physics and Materials Science City University of Hongkong Kowloon HK SAR China Central Iron and Steel Research Institute Beijing 100081 China

The compression creep deformation of the high volume fraction of SiC particles reinforced AI-Mg-Si composite fabricated by pressure-less infiltration was investigated. The experimental results show that the creep stress exponents are very high at temperatures of 673 K, 723 K and 773 K, and if taking the threshold stress into account, the true stress exponent of minimum creep strain rate is still approximately 5, although the volume fraction of reinforcements is very high. The creep strain rate in the high volume fraction reinforced aluminum alloy matrix composites is controlled by matrix lattice diffusion. It is found that the creep-strengthening effect of high volume fraction of silicon carbide particles is significant, although the particles do not form effective obstacles to dislocation motion.

关键词： composite creep SiC aluminum

Trained immunity and macrophage reprogramming in allergic disorders

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Cellular & Molecular Immunology 2023年第9期20卷 1084-1086页

作者： Pei-chi Chen Miao-Hsi Hsieh Wen-Shuo Kuo lawrence Shih-Hsin wu Jiu-Yao Wang Center for Allergy Immunologyand Microbiome(A.M.)China Medical University HospitalTaichungTaiwanChina Department of Nursing National Tainan Junior College of NursingTainanTaiwanChina school of Chemistry and Materials Science Nanjing University of Information Science and TechnologyNanjingChina Graduate Institute of Biomedical Sciences China Medical UniversityTaichungTaiwanChina Department of Allergy Immunologyand Rheumatology(AIR)China Medical University Children's HospitalTaichungTaiwanChina

"Practice is the hardest part of learning,and training is the essence of transformation."Ann Voskamp,One Thousand Gifts:A Dare to Live Fully Right Where YouAre Early-life exposure to environmental allergens and viral infections can lead to trained immunity and macrophage polarization resulting in an augmented type 2 immune response in allergic ***,the detailed mechanism is unknown.

关键词： immunity allergic macrophage

Warm up, cool down, and tearing apart in NK cell memory

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Cellular & Molecular Immunology 2018年第12期15卷 1095-1097页

作者： lawrence Shih-Hsin wu Jiu-Yao Wang Graduate Institute of Medical Sciences China Medical UniversityTaichungTaiwanChina Department of Pediatrics Center for Allergy and Clinical Immunology ResearchCollege of MedicineNational Cheng Kung University HospitalTainanTaiwanChina

“Memories warm you up from the *** they also tear you apart.”―Haruki Murakami,Kafka on the *** of the characteristics of the human immune system,in addition to the recognition of nonself pathogens and the tolerance of self-antigens,is its memory response to previously encountered pathogens and the mounting of a stronger,faster secondary response against these same antigens.A long-held paradigm in immunologic study in vertebrates is that immune memory is restricted to the adaptive immune response via memory T and B cells,which possess two distinct features:specificity(recognizing pathogen antigen fragments through surface receptors)and longevity(proliferation and long-term survival after the first encounter).1–3 Unlike adaptive immunity,the innate immune system exhibits a rapid response against pathogens and transforming cells without a previous encounter,and this response depends on a series of default genes and proteins expressed on cell surfaces and in the cytoplasm that recognize the pathogen-associated molecular patterns(PAMPs)of ***,it was surprising to find several models of pathogen infections in invertebrates,including insects,worms,and jawless fish,that lack fully developed adaptive immunity but possess the features of antigen specificity and longevity likely involving phagocytic cells that can“recall”prior infection with limited *** fact,immune memory has recently been described in vertebrate myeloid lineages,4 in which epigenetic changes are proposed to occur in macrophages previously stimulated through pattern recognition receptors.

关键词： specificity immunity likely

Disease tolerance to infection: the immune defense strategy of mitoribosome targeting

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Cellular & Molecular Immunology 2021年第7期18卷 1626-1627页

作者： lawrence Shih-Hsin wu Jiu-Yao Wang Graduate Institute of Biomedical Sciences China Medical UniversityTaichungTaiwanChina Center for Allergy and Clinical Immunology Research(ACIR) College of MedicineNational Cheng Kung University HospitalTainanTaiwanChina Department of Pediatric Allergy and Clinical Immunology Children’s HospitalChina Medical UniversityTaichungTaiwanChina

“In the practice of tolerance,one’s enemy is the best teacher”.-Sayings of *** survive an infection,two evolutionarily conserved defense strategies are required for infected host *** strategy in volves acquiri ng resista nee by reduci ng pathogen load via pathoge n recog nition,signaling tran sducti on pathways,and effector *** strategy involves increasing disease tolerance by eliciting tissue damage control mechanisms,which adjust the metabolic output of host tissue in response to different forms of stress and ***,in recent research,disease tolera nee is regarded as an in here nt comp onent of immunity,which does not exert a direct impact on pathogens but is essential to limit the health and fitness costs of infection;however,its molecular bases remain poorly understood.

关键词： infection damage immunity

Morphology and orientation evolution of Cu_(6)Sn_(5)grains on(001)Cu and(011)Cu single crystal substrates under temperature gradient

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Journal of Materials Science & Technology 2021年第36期95卷 29-39页

作者： Yuanyuan Qiao Xiaoying Liu Ning Zhao lawrence C M wu Chunying Liu Haitao Ma School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China Department of Materials Science and Engineering City University of Hong KongHong Kong Special Administrative RegionChina

The morphology and orientation evolution of Cu_(6)Sn_(5)grains formed on(001)Cu and(011)Cu single crystal substrates under temperature gradient(TG)were *** initial orientated prism-type Cu_(6)Sn_(5)grains transformed to non-orientated scallop-type after isothermal ***,the Cu_(6)Sn_(5)grains with strong texture were revealed on cold end single crystal Cu substrates by imposing *** Cu_(6)Sn_(5)grains on(001)Cu grew along their c-axis parallel to the substrate and finally merged into one grain to form a fully IMC joint,while those on(011)Cu presented a strong texture and merged into a few dominant Cu_(6)Sn_(5)grains showing about 30°angle with the *** merging between neighboring Cu_(6)Sn_(5)grain pair was attributed to the rapid grain growth and grain boundary ***,a model was put forward to describe the merging *** different morphology and orientation evolutions of the Cu_(6)Sn_(5)grains on single crystal and polycrystal Cu substrates were revealed based on crystallographic relationship and Cu *** method for controlling the morphology and orientation of Cu_(6)Sn_(5)grains is really benefitial to solve the reliability problems caused by anisotropy in 3 D packaging.

关键词： 3D packaging Single crystal Cu Temperature gradient Orientation Disregistry Grain boundary migration

New Organic Dyes Based on Biarylmethylene-Bridged Triphenylamine for Dye Sensitized Solar Cell

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chinese Journal of Chemistry 2015年第8期33卷 925-933页

作者： Fei wu Haitao Liu lawrence Tien Lin Lee Tao Chen Min Wang Linna Zhu Faculty of Materials and Energy Southwest University Chongqing 400715 China Department of Physics The Chinese University ofHong Kong Shatin New Territories Hong Kong China

Three new organic dyes were synthesized and characterized for applications in dye-sensitized solar cells （DSSCs）. In these dyes, diarylmethylene-bridged triphenylarnine is the donor, and different acceptors and vinyl- thiophene are designed to get TBA-1, TBA-2 and TBA-3. Their photophysical, electrochemical and photovoltaic properties were investigated, and the effects of the acceptor structures as well as the linkage on these properties were evaluated. Results demonstrated that the vinylthiophene linkage between the donor and the acceptor is favor- able for improving light harvesting ability of TBA-2. In addition, the electrochemical impedance spectroscopy ex- periments suggest larger Rrec and longer electron lifetime of TBA-2. Therefore, it outperforms the other dyes, exhib- iting the highest power conversion efficiency of 3.87%, with Jsc of 8.25 mAocm-2 and Voc of 666 mV. Unfortunately, the TBA-3 with three acceptor groups only shows efficiency of 3.52%, indicating that the design of increasing ac- ceptor groups plays little role on enhancing the solar cell efficiency.

关键词： diarylmethylene-bridged triphenylamine dye-sensitized solar cells acceptor rhodanine-3-acetic acid