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Photo-and Electrocatalytic CO_(2)Reduction Based on Stable Lead-Free Perovskite Cs2PdBr6

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Energy & Environmental Materials 2023年第5期6卷 364-371页

作者： Daofu Wu cheng Wang Benjun huo Ke Hu Xinchun Mao Zhigang Geng Qiang Huang Wenxia Zhang Jie Zeng Xiaosheng Tang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly-Coupled Quantum Matter PhysicsKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei230026China College of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Department of Chemistry Shandong UniversityWeihai 264200China Institute of Materials Chinese Academy of Engineering PhysicsJiangyou 621908China

All-inorganic lead-free palladium(Pd)halogen perovskites with prominent optoelectronic properties provide admirable potential for selective photo-and electroreduction of CO_(2).But it remains unachieved for effectively converting the CO_(2)to CO with high selectivity on Pd-based perovskites driven by solar light or ***,high-quality Cs_(2)PdBr_(6)microcrystals and nanocrystals were synthesized through a facile antisolvent *** all the reported pure-phase perovskites,the Cs_(2)PdBr_(6)nanocrystals synthesized at 50℃performed the highest effectiveness on CO_(2)to CO conversion generating 73.8μmol g^(-1)of CO yield with 100%selectivity under visible light illumination(λ>420 nm)for 3 ***,for the first time,we report a new application of lead-free perovskites,in which they are applied to electrocatalysis of CO_(2)reduction ***,they showed significant electrocatalytic activity(Faradaic yield:78%for CO)and operation stability(10 h).And the surface reaction intermediates were dynamically monitored and precisely unraveled according to the in situ diffuse reflectance infrared Fourier transform spectra *** combination with the density functional theory calculation,the reaction mechanism and pathways were *** work not only provides significant strategies to enhance the photocatalytic performance of perovskites,but also shows excellent potential for their application in electrocatalysis.

关键词： CO_(2)reduction crystallinity lead-free perovskites morphology photocatalysis reaction mechanism

ON THE CONVERGENCE OF THE NONNESTED V-CYCLE MULTIGRID METHOD FOR NONSYMMETRIC AND INDEFINITE SECOND-ORDER ELLIPTIC PROBLEMS

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Journal of Computational Mathematics 2006年第2期24卷 157-168页

作者： huo-yuan Duan Qun Lin LSEC ICMSEC Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

This paper provides a proof for the uniform convergence rate （independently of the number of mesh levels） for the nonnested V-cycle multigrid method for nonsymmetric and indefinite second-order elliptic problems.

关键词： Nonnested V-cycle multigrid method Second-order elliptic problems.

Chiral multiple-resonance thermally activated delayed fluorescence materials based on chiral spiro-axis skeleton for efficient circularly polarized electroluminescence

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Science China Chemistry 2024年第7期67卷 2257-2264页

作者： shi-Quan Song Xiao Han Zhong-Zhong huo Ching-Fai Yip Xian-Fang Hong Meng-Ning Ding You-Xuan Zheng State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Key Laboratory of Mesoscopic Chemistry of Ministry of Education School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Chiral luminescence materials have potential applications in the field of three-dimensional displays due to their circularly polarized luminescence(CPL)***,the further development of circularly polarized organic light-emitting diodes(CP-OLEDs)needs to meet the requirements of high efficiency,high color purity,low cost,and high dissymmetry factor(gPLor gEL),chiral multiple resonance thermally activated delayed fluorescence(MR-TADF)materials are considered as candidates in these ***,based on a pair of chiral spirofluorene precursors,two pairs of high-performance chiral MR-TADF emitters((R/S)-p-Spiro-DtBuCzB and(R/S)-m-Spiro-DtBuCzB)are developed,which exhibit strong emissions peaking at 491 and 502 nm in toluene with full-width at half-maximum values of 25 and 33 nm,*** addition,small singlet–triplet energy gaps of 0.15 and 0.10 eV with high absolute photoluminescence efficiencies of 95.0%and 96.7%are observed for p-Spiro-DtBuCzB and m-Spiro-DtBuCzB molecules,*** based on p-Spiro-DtBuCzB and m-Spiro-DtBuCzB display high maximum external quantum efficiencies of 29.6%and 33.8%,*** importantly,CP-OLEDs present symmetric circularly polarized electroluminescence spectra with|gEL|factors of 3.36×10^(-4)and 7.66×10^(-4)for devices based on(R/S)-p-Spiro-DtBuCzB and(R/S)-m-Spiro-DtBuCzB enantiomers,respectively.

关键词： chiral spiro-axis skeleton-based material multiple resonance thermally activated delayed fluorescence circularly polarized electroluminescence dissymmetry factor external quantum efficiency

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Recent advances in theoretical models of respiratory mechanics

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Acta Mechanica Sinica 2012年第1期28卷 1-7页

作者： Bo huo Rui-Rong Fu Key Laboratory of Microgravity&Center for Biomechanicsand Bioengineering Institute of Mechanics Chinese Academy of Sciences100190 BeijingChina

As an important branch of biomedical engineering, respiratory mechanics helps to understand the physiology of the respiratory system and provides fundamental data for developing such clinical technologies as ventilators. To solve different clinical problems, researchers have developed numerous models at various scales that describe biological and mechanical properties of the respiratory system. During the past decade, benefiting from the continuous accumulation of clinical data and the dramatic progress of biomedical technologies （e.g. biomedical imaging）, the theoretical modeling of respiratory mechanics has made remarkable progress regarding the macroscopic properties of the respiratory process, complexities of the respiratory system, gas exchange within the lungs, and the coupling interaction between lung and heart. The present paper reviews the advances in the above fields and proposes potential future projects.

关键词： Respiratory mechanics Biomechanics Gas exchange

Simulating Carbon Sequestration and GHGs Emissions in Abies fabric Forest on the Gongga Mountains Using a Biogeochemical Process Model Forest-DNDC

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Journal of Mountain Science 2008年第3期5卷 249-256页

作者： LU Xuyang cheng Genwei XIAO Feipeng huo Changfu Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

The process-oriented model Forest-DNDC describing biogeochemical cycling of C and N and GHGs （greenhouse gases） fluxes （CO2, NO and N2O） in forest ecosystems was applied to simulate carbon sequestration and GHGs emissions in Abies fabric forest of the Gongga Mountains at southeastern edge of the Tibetan Plateau. The results indicated that the simulated gross primary production （GPP） of Abies fabric forest was strongly affected by temperature. The annual total GPP was 24,245.3 kg C ha^-1 yr^-1 for 2005 and 26,318.8 kg C ha^-1 yr^-1 for 2006, respectively. The annual total net primary production （NPP） was 5,935.5 and 4,882.2 kg C ha^-1 yr^-1 for 2005 and 2006, and the annual total net ecosystem production （NEP） was 4,815.4 and 3,512.8 kg C ha^-1 yr^-1 for 2005 and 2006, respectively. The simulated seasonal variation in CO2 emissions generally followed the seasonal variations in temperature and precipitation. The annual total CO2 emissions were 3,109.0 and 4,821.0 kg C ha^-1 yr^-1 for 2005 and 2006, the simulated annual total N2O emissions from forest soil were 1.47 and 1.36 kg N ha^-1 yr^-1 for 2005 and 2006, and the annual total NO emissions were 0.09 and o.12 kg N ha^-1 yr^-1 for 2005 and 2006, respectively.

关键词： Carbon sequestration Forest-DNDC GHGs Abiesfabric forest Gongga Mountains

Probing the mechanosensitivity in cell adhesion and migration: Experiments and modeling

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Acta Mechanica Sinica 2013年第4期29卷 469-484页

作者： Bao-Hua Ji Bo huo Biomechanics and Biomaterials Laboratory School of Aerospace Engineering Beijing Institute of Technology

Cell adhesion and migration are basic physiolog- ical processes in living organisms. Cells can actively probe their mechanical micro-environment and respond to the ex- ternal stimuli through cell adhesion. Cells need to move to the targeting place to perform function via cell migration. For adherent cells, cell migration is mediated by cell-matrix adhesion and cell-cell adhesion. Experimental approaches, especially at early stage of investigation, are indispensable to studies of cell mechanics when even qualitative behaviors of cell as well as fundamental factors in cell behaviors are unclear. Currently, there is increasingly accumulation of ex- perimental data of measurement, thus a quantitative formula- tion of cell behaviors and the relationship among these fun- damental factors are highly needed. This quantitative under- standing should be crucial to tissue engineering and biomed- ical engineering when people want to accurately regulate or control cell behaviors from single cell level to tissue level. In this review, we will elaborate recent advances in the ex- perimental and theoretical studies on cell adhesion and mi- gration, with particular focuses laid on recent advances in experimental techniques and theoretical modeling, through which challenging problems in the cell mechanics are sug- gested.

关键词： Cell mechanics ~ Cell adhesion. Cell migration.Modeling ~ Mechanobiology

Bandgap Properties for the Folded S-Type Periodic Structure:Numerical Simulation and Experiment

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Acta Mechanica Solida Sinica 2023年第5期36卷 624-632页

作者： Tongtong huo Zhijing Wu Fengming Li College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China

The central wavelength of the first Bragg scattering bandgap is approximately twice that of the ***,a low-frequency Bragg scattering bandgap with a small structural dimension for phononic crystals is difficult to *** this study,a folded S-type periodic structure is developed to reduce the dimension in the direction of vibration suppression by folding unit *** to the foregoing,an improved folded S-type periodic structure with different unit cell arrangements is designed to widen the bandgap frequency *** band diagrams and frequency responses are calculated based on the Bloch theory and using the finite element ***,a prototype of the improved folded S-type periodic structure is fabricated using a three-dimensional printing technique,and a vibration experiment is *** verify the vibration reduction performance of the structure,numerical simulation and experimental results are *** type of folded periodic structure can effectively reduce dimensions to satisfy the dimension requirements pertaining to the direction of vibration ***,the foregoing can aid in promoting the use of elastic bandgap structures in engineering.

关键词： Folded S-type periodic structure Bandgap Vibration reduction Finite element method Vibration experiment

Rainfall amount determines annual herb controls over soil seed bank and its similarity with vegetation in the Tengger Desert

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Ecological Processes 2022年第1期11卷 27-37页

作者： Ya‑Fei shi Zeng‑Ru Wang Bing‑Xin Xu Jian‑Qiang huo Rui Hu Yang Zhao Zhi‑Shan Zhang Shapotou Desert Research and Experiment Station Northwest Institute of Eco‑Environment and ResourcesChinese Academy of SciencesLan‑zhou 730000Gansu ProvincePeople’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China State Key Laboratory of Grassland Agro‑Ecosystems Key Laboratory of Grass‑land Livestock Industry InnovationMinistry of Agriculture and Rural AffairsEngineering Research Center of Grassland IndustryMinistry of EducationCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730020Gansu ProvincePeople’s Republic of China

Background:Soil seed banks may offer great potential for maintaining and restoring desert ecosystems that have been degraded by climate change and anthropogenic ***,few studies have explored the year‑to‑year dynamics in the species composition(richness and abundance)of these desert soil seed ***,we conducted a 4‑year study to assess the effects of environmental factors(meteorology and microtopography)and aboveground vegetation on the soil seed bank of the Tengger Desert,***:We found the seed bank was dominated by annual herb species both in species richness and *** rainfall in the growing season increased the number of seeds in the soil seed bank,and quadrat micro‑elevation had a negative effect on soil seed bank *** species composition in the seed bank had significantly larger between‑year similarity than that in the aboveground vegetation due to the dominance of annual herb *** different life forms,the species composition of annual herbs showed distinctly larger temporal similarity between the aboveground vegetation and the seed bank compared with perennial herbs and ***:Our findings highlight that the combined effects of environmental factors and plant life forms deter‑mine the species composition(especially the abundance)of soil seed banks in ***,if degraded desert ecosystems are left to regenerate naturally,the lack of shrub and perennial herb seeds could crucially limit their *** intervention and management may have to be applied to enhance the seed abundance of perennial lifeforms in degraded deserts.

关键词： Desert ecosystem Seed bank dynamics Rainfall Plant type Vegetation regeneration Annual herbs

Stability of perfect and imperfect cylindrical shells under axial compression and torsion

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Journal of Central South University 2014年第4期21卷 1264-1274页

作者：袁喆霍世慧耿小亮 School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Architectural Engineering College Xi'an Peihua University

Stability analyses of perfect and imperfect cylindrical shells under axial compression and torsion were presented. Finite element method for the stability analysis of perfect cylindrical shells was put forward through comparing critical loads and the first buckling modes with those obtained through theoretical analysis. Two typical initial defects, non-circularity and uneven thickness distribution, were studied. Critical loads decline with the increase of non-circularity, which exist in imperfect cylindrical shells under both axial compression and torsion. Non-circularity defect has no effect on the first buckling mode when cylindrical shell is under torsion. Unfortunately, it has a completely different buckling mode when cylindrical shell is under axial compression. Critical loads decline with the increase of thickness defect amplitude, which exist in imperfect cylindrical shells under both axial compression and torsion, too. A greater wave number is conducive to the stability of cylindrical shells. The first buckling mode of imperfect cylindrical shells under torsion maintains its original shape, but it changes with wave number when the cylindrical shell is under axial compression.

关键词： stability cylindrical shell non-circularity thickness distribution axial compression torsion