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Palladium single atoms from melting nanoparticles on WO_(3-x) for boosted hydrogen evolution reaction

Journal of Energy Chemistry 2024年第4期91卷 637-644页

作者： Zhongmiao Gong Zhigang Chen Hao li Guang Yang Min Yuan zhiyun li Xueying Wan Yi Cui School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026AnhuiChina i-lab Vacuum Interconnected Nanotech WorkstationSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina School of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China Key Laboratory of Precision and Intelligent Chemistry School of Chemistry and Materials ScienceHefei National Research Center for Physical Sciences at the MicroscaleNational Synchrotron Radiation LaboratorySchool of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

Surface-supported isolated atoms in single-atom catalysts(SACs)grant maximum utilization of metals in heterogeneous ***,we report a feasible pyrolysis strategy to synthesize Pd single atoms by thermally melting Pd nanoparticles on an oxygen-vacancy-rich tungsten-oxide matrix at reduction *** ambient pressure X-ray photoelectron spectroscopy was used to monitor the formation of zero-valence Pd single atoms and the increased metallic feature of WO_(3-x)***,the as-obtained zero-valence Pd single-atom catalyst exhibits a markedly boosted HER activity with a low overpotential(η_(10)=70 mV)at the current density of 10 mA/cm2and a small Tafel slope(b=68 mV/dec),nearly 150 mV and a 3,0-fold enhancement than those of Pd nanoparticles(η_(10)=220 mV,b=133 mV/dec)under the same *** addition,quasi in situ XPS results suggest the hydrogen spillover effect is more likely to occur on Pd single atoms during the electrochemical *** work may pave an interesting route for the rational design of highly-efficient single-atom catalysts,and the elucidation of corresponding enhanced reaction mechanisms by the utilization of advanced characterization techniques.

关键词： Pd WO_(3-x) Single-atom catalysts NAP-XPS HER

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The dynamic surface evolution of halide perovskites induced by external energy stimulation

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National Science Review 2024年第4期11卷 185-194页

作者： Feiyu Cheng Pengdong Wang Chenzhe Xu Qingliang liao Suicai Zhang Haochun Sun Wenqiang Fan Guodong liu zhiyun li Yaping Kong li Wang Fangsen li Zhuo Kang Yue Zhang Academy for Advanced Interdisciplinary Science and Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing Key Laboratory for Advanced Energy Materials and Technologies Key Laboratory of Advanced Materials and Devices for Post-Moore ChipsMinistry of EducationBeijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology Beijing Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

Tracking the dynamic surface evolution of metal halide perovskite is crucial for understanding the corresponding fundamental principles of photoelectric properties and intrinsic instability. However, due to the volatility elements and soft lattice nature of perovskites, several important dynamic behaviors remain unclear. Here, an ultra-high vacuum（UHV） interconnection system integrated by surface-sensitive probing techniques has been developed to investigate the freshly cleaved surface of CH3NH3PbBr3in situ under given energy stimulation. On this basis, the detailed three-step chemical decomposition pathway of perovskites has been clarified. Meanwhile, the evolution of crystal structure from cubic phase to tetragonal phase on the perovskite surface has been revealed under energy stimulation. Accompanied by chemical composition and crystal structure evolution, electronic structure changes including energy level position,hole effective mass, and Rashba splitting have also been accurately determined. These findings provide a clear perspective on the physical origin of optoelectronic properties and the decomposition mechanism of perovskites.

关键词： metal halide perovskite external energy stimulation surface dynamic evolution surface electronic structure ultra-high vacuum interconnection system

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Multi-site Passivation of ZnO Metal Oxides via Biomolecules for Efficient and Highly Stable Organic Solar Cells

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Chinese Journal of Chemistry 2024年第14期42卷 1582-1592页

作者： Irfan Ismail Maria Khalil Xiaomei Gao Xingze Chen Muhammad Jawad Rong Huang zhiyun li Emmanuel Acheampong Tsiwah Wei-shi li Qun Luo Chang-Qi Ma i-Lab&Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)SuzhouJiangsu215123 China University of Chinese Academy of Sciences(UCAS) Beijing100040 China School of Nano-Tech and Nano-Bionics University of Science and Technology of China(USTC)HefeiAnhui230027 China Shanghai Institute of Organic Chemistry(SIOC) Chinese Academy of Sciences(CAS)Shanghai200032 China Vacuum Interconnected Nanotech Workstation(Nano-X) SuzhouJiangsu215123 China

ZnO nanoparticles(nps)among metal oxide(MOs)are proven to be essential electron transporting layers(ETLs)applied in organic solar cells(OSCs).However,intrinsic defects,interfacial charge recombination,and catalytic behavior towards the active layer restrict the applications of ZnO nps for efficient and long-term stable *** commonly available biomolecule cytidine 5'-monophosphate(CMP-OH)with phosphonic acid,its salt cytidine 5'-monophosphate disodium salt(CMP-ONa)with a phosphate group as an anchoring group and conjugated terminal functional in both analogous molecules provide carrier transfer bridge at bottom interface of the active *** theoretical investigations and characterizations have discovered the multi-site coordination of CMP-OH towards acceptor molecules and ZnO *** dual-side alignment of CMP analogous molecules hinders interfacial charge recombination and enhances charge transfer potential at ***,PM6:L8-BO-based OSCs with modified ETL obtain 18.13%efficiency,12%higher than that of unmodified *** higher efficiency,CMP-OH-based OSC devices illustrate remarkably improved thermal stability for 500 h at 85℃with 72%of initial PCE and operation stability for 2000 h with 90.1%of initial *** work reveals the passivation mechanism of multi-anchoring groups towards MOs and single-functional groups towards the active layer to optimize the interface for efficient and highly stable OSCs.

关键词： Organic solar cells Nanoparticles Nucleotides Interfacial interactions Surface chemistry Multi-site passivation

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黎曼流形上的非精确信赖域算法

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石河子大学学报（自然科学版） 2024年第3期42卷 390-396页

作者：李祉赟王湘美贵州大学数学与统计学院贵州贵阳550025

为求解黎曼流形上的大规模可分离问题,Kasai等人在(Advances of the neural information processing systems, 31, 2018)中提出了使用非精确梯度和非精确Hessian的黎曼信赖域算法,并给出了该算法的迭代复杂度(只有证明思路,没有具体证明... 详细信息

为求解黎曼流形上的大规模可分离问题,Kasai等人在(Advances of the neural information processing systems, 31, 2018)中提出了使用非精确梯度和非精确Hessian的黎曼信赖域算法,并给出了该算法的迭代复杂度(只有证明思路,没有具体证明)。我们指出在该文献的假设条件下,按照其思路不能证明出相应的结果。本文提出了不同的参数假设,并证明了算法具有类似的迭代复杂度。

关键词：黎曼流形非精确信赖域算法迭代复杂度拉回映射

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阿尔塔斯水电站泥沙淤积计算与分析

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浙江水利科技 2024年第3期52卷 52-56页

作者：李志赟新疆水利水电勘测设计研究院有限责任公司新疆乌鲁木齐830000

阿尔塔斯水电站是喀拉喀什河梯级开发方案中的第八座水电站,以水力发电为主。为协调水库泥沙淤积与水库兴利效益之间的关系,确定工程规模,开展水库泥沙淤积计算分析是十分必要的。建立一维非均匀流不平衡输沙数学模型,根据实测断面、入... 详细信息

阿尔塔斯水电站是喀拉喀什河梯级开发方案中的第八座水电站,以水力发电为主。为协调水库泥沙淤积与水库兴利效益之间的关系,确定工程规模,开展水库泥沙淤积计算分析是十分必要的。建立一维非均匀流不平衡输沙数学模型,根据实测断面、入库水沙系列等资料,计算分析水电站建成后不同时期的泥沙淤积及其分布,论证水库泥沙调度运行水位。结果表明:水库运行30 a时,死库容淤积量占初始死库容的73.3%,调节库容减少33.0%;汛期不降低水位调度运行,多年平均年发电量比降低死水位运行多145.8%。

关键词：阿尔塔斯水电站一维水沙模型泥沙淤积淤积形态泥沙调度运行水位

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不同菠萝叶渣添加量对赤灵芝发酵基质营养成分及体外抗氧化活性研究

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四川农业大学学报 2024年第1期42卷 197-206页

作者：刘义军李盖林丽静刘佳梦陈嘉恩黎智韵陈港华南理工大学轻工科学与工程学院广州510641 中国热带农业科学院农产品加工研究所海南省果蔬贮藏与加工重点实验室广东湛江524001 广东收货罐头食品有限公司广东湛江524100

【目的】揭示不同菠萝叶渣添加量对赤灵芝发酵基质营养成分和体外抗氧化活性的影响,为菠萝叶渣的开发利用提供了新的基础数据支撑。【方法】采用全自动氨基酸分析仪、OPLA-DA结合S-plot等仪器和方法分析发酵基质中粗纤维、多糖、总萜、... 详细信息

【目的】揭示不同菠萝叶渣添加量对赤灵芝发酵基质营养成分和体外抗氧化活性的影响,为菠萝叶渣的开发利用提供了新的基础数据支撑。【方法】采用全自动氨基酸分析仪、OPLA-DA结合S-plot等仪器和方法分析发酵基质中粗纤维、多糖、总萜、水解氨基酸和游离氨基酸等营养成分,以及赤灵芝发酵基质水提物的羟基自由基清除能力差异、DPPH自由基清除能力和总抗氧化能力等体外抗氧化活性的变化规律进行分析。【结果】菠萝叶渣胁迫下促进赤灵芝发酵基质中粗纤维降解、释放多糖含量;对赖氨酸和甘氨酸代谢路径具有显著的调节作用含量;游离氨基酸中肌氨酸、a-氨基己二酸呈现出增加的趋势,其他氨基酸整体上呈现出下降的趋势。其中天冬氨酸和苏氨酸等8种游离氨基酸含量差异显著,且不同菠萝叶渣添加量下,存在特异性氨基酸成分;菠萝叶渣有助于提高赤灵芝发酵基质水提物的羟基自由基清除能力和总抗氧化能力,降低DPPH自由基清除能力。【结论】不同菠萝叶渣添加量对赤灵芝发酵基质粗纤维、氨基酸组成以及相关代谢路径具有不同的调节作用。

关键词：菠萝叶渣灵芝抗氧化活性发酵

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Interfacial dynamics of GaP/Si(100) heterostructure grown by molecular beam epitaxy

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Journal of Semiconductors 2022年第12期43卷 32-38页

作者： Tieshi Wei Xuefei li zhiyun li Wenxian Yang Yuanyuan Wu Zhiwei Xing Shulong Lu Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China Vacuum Interconnected Nanotech Workstation(NANO-X) Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

The atomic structure and surface chemistry of GaP/Si(100)heterostructure with different pre-layers grown by molecu-lar beam epitaxy are *** is found that GaP epilayer with Ga-riched pre-layers on Si(100)substrate has regular surface mor-phology and stoichiometric abrupt heterointerfaces from atomic force microscopes(AFMs)and spherical aberration-corrected transmission electron microscopes(ACTEMs).The interfacial dynamics of GaP/Si(100)heterostructure is investigated by X-ray photoelectron spectroscopy(XPS)equipped with an Ar gas cluster ion beam,indicating that Ga pre-layers can lower the inter-face formation energy and the bond that is formed is more *** results suggest that Ga-riched pre-layers are more con-ducive to the GaP nucleation as well as the epitaxial growth of GaP material on Si(100)substrate.

关键词： XPS interfacial dynamics GaP/Si(100)heterostructure MBE

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Recent development on COX-2 inhibitors as promising anti-inflammatory agents:The past 10 years

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Acta Pharmaceutica Sinica B 2022年第6期12卷 2790-2807页

作者： Zhiran Ju Menglan li Junde Xu Daniel C.Howell zhiyun li Fen-Er Chen Institute of Pharmaceutical Science and Technology Zhejiang University of TechnologyHangzhou 310014China Engineering Center of Catalysis and Synthesis for Chiral Molecules Fudan UniversityShanghai 200433China Shanghai Engineering Center of Industrial Asymmetric Catalysis for Chiral Drugs Shanghai 200433China Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of TechnologyHangzhou 310014China

Cyclooxygenases play a vital role in inflammation and are responsible for the production of *** cyclooxygenases are described,the constitutive cyclooxygenase-1 and the inducible cyclooxygenase-2,for which the target inhibitors are the non-steroidal anti-inflammatory drugs(NSAIDs).Prostaglandins are a class of lipid compounds that mediate acute and chronic *** are the most frequent choices for treatment of ***,currently used anti-inflammatory drugs have become associated with a variety of adverse effects which lead to diminished output even market ***,more studies have been carried out on searching novel selective COX-2 inhibitors with safety *** this review,we highlight the various structural classes of organic and natural scaffolds with efficient COX-2 inhibitory activity reported during *** will be valuable for pharmaceutical scientists to read up on the current chemicals to pave the way for subsequent research.

关键词： Inflammation Cyclooxygenase Prostaglandins Adverse effects COX-2 inhibitors

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切线模量法计算筏板基础沉降的分块网格尺寸分析

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广东水利水电 2024年第6期 1-6页

作者：廖汉阳杨光华姜燕李志云华南理工大学土木与交通学院广州510640 广东省水利水电科学研究院广州510635 广东省岩土工程技术研究中心广州510635

切线模量法计算筏板基础沉降时需对板底土层在水平面上进行分块网格的划分,而在实际应用之中,网格尺寸与基础形状、基础尺寸以及人为的选取都有关系,为了探究在实际应用之中网格尺寸大小对于沉降计算结果的影响,该文针对一均匀深厚土层... 详细信息

切线模量法计算筏板基础沉降时需对板底土层在水平面上进行分块网格的划分,而在实际应用之中,网格尺寸与基础形状、基础尺寸以及人为的选取都有关系,为了探究在实际应用之中网格尺寸大小对于沉降计算结果的影响,该文针对一均匀深厚土层上的矩形筏板基础,将筏板分别视为柔性板与弹性板进行沉降计算分析,得到了网格尺寸对于沉降结果的影响在柔性板时可以忽略,在弹性板且荷载处于正常使用范围之内时可以忽略的结论,说明了切线模量法计算筏板基础沉降是一种较为实用的方法。

关键词：筏板基础切线模量法网格尺寸沉降计算

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Growth,coalescence,and etching of two-dimensional overlayers on metals modulated by near-surface Ar nanobubbles

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Nano Research 2022年第3期15卷 2706-2714页

作者： Wei Wei Jiaqi Pan Haiping lin Chanan Euaruksakul zhiyun li Rong Huang li Wang Zhujun Wang Qiang Fu Yi Cui Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Synchrotron light Research Institute Nakhon Ratchasima 30000Thailand School of Physical Science and Technology Shanghai Tech UniversityShanghai 200031China Scientific Center for Optical and Electron Microscopy ETH Zürich8093 ZürichSwitzerland State Key Laboratory of Catalysis iChEMDalian Institute of Chemical Physicsthe Chinese Academy of SciencesDalian 116023China

The synthesis of high-quality ultrathin overlayers is critically dependent on the surface structure of substrates,especially involving the overlayer–substrate *** using in situ surface measurements,we demonstrate that the overlayer–substrate interaction can be tuned by doping near-surface Ar *** interfacial coupling strength significantly decreases with near-surface Ar nanobubbles,accompanying by an“anisotropic to isotropic”growth *** the substrate containing near-surface Ar,the growth front crosses entire surface atomic steps in both uphill and downhill directions with no difference,and thus,the morphology of the two-dimensional(2D)overlayer exhibits a ***,the round-shaped 2D overlayers coalesce seamlessly with a growth acceleration in the approaching direction,which is barely observed in the synthesis of 2D *** can be attributed to the immigration lifetime and diffusion rate of growth species,which depends on the overlayer–substrate interaction and the surface ***,the“round to hexagon”morphological transition is achieved by etching-regrowth,revealing the inherent growth kinetics under quasi-freestanding *** findings provide a novel promising way to modulate the growth,coalescence,and etching dynamics of 2D materials on solid surfaces by adjusting the strength of overlayer–substrate interaction,which contributes to optimization of large-scale production of 2D material crystals.

关键词： two dimensional materials overlayer–substrate interaction near-surface Ar nanobubbles evolution behavior surface dynamics

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