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Structure and properties of solid-state synthesized poly(3,4-propylenedioxythiophene)/nano-ZnO composite

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Progress in Natural Science:Materials International 2013年第6期23卷 524-531页

作者： Ahmat Ali Ruxangul Jamal weiwei shao Adalet Rahman Yakupjan Osman Tursun Abdiryim Key Laboratory of Petroleum and Gas Fine Chemicals Educational Ministry of ChinaCollege of Chemistry and Chemical EngineeringXinjiang University Key Laboratory of Functional Polymers Xinjiang University

Poly(3,4-propylenedioxythiophene)/nano-Zinic Oxide(PProDOT/ZnO) composites with the content of 3-7 wt%nano-ZnO were synthesized by the solid-state method with FeClas *** structure and morphology of the composites were characterized by Fourier transform infrared(FTIR)spectroscopy,ultraviolet-visible(UV-vis) absorption spectroscopy,X-ray diffraction(XRD) and transmission electron microscopy(TEM).The electrochemical performances of the composites were investigated by galvanostatic charge-discharge,cyclic voltammetry and electrochemical impedance spectroscopy(EIS).The photocatalytic activities of the composites were investigated by the degradation of methylene blue(MB) dyes in aqueous medium under UV light *** results from FTIR and UV-vis spectra showed that the PProDOT/ZnO composites were successfully synthesized by solid-state method,and nano-ZnO had great influences on the conjugation length and oxidation degree of the ***,the PProDOT/5 wt%ZnO had the highest conjugation and oxidation degree among the *** results of XRD analysis indicated that there were some FeCl~- ions as doping agent in the PProDOT matrix,and the content of ZnO had no effect on diffraction pattern of *** studies revealed that the pure PProDOT and composites had similar morphological structure,and all the composites displayed an irregular sponge like *** results of electrochemical tests showed that the PProDOT/5 wt%ZnO had a higher electrochemical activity with a specific capacitance value of 220 F gthan *** results from photocatalytic activities of the composites indicated that the PProDOT/5 wt%ZnO had better photocatalytic activity than other composites.

关键词： Poly(3,4-Propylenedioxythiophene) Nano-Zinc oxide Composite Solid-state method

Probing reaction pathways for H_(2)O-mediated HCHO photooxidation at room temperature

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Nano Research 2021年第5期14卷 1471-1478页

作者： weiwei shao Xiaodong Li Xiaolong Zu Liang Liang Yang Pan Junfa Zhu Chengming Wang Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sciences at Microscale National Synchrotron Radiation LaboratoryHefei Science Center of CASUniversity of Science and Technology of ChinaHefei230026China Institute of Energy Hefei Comprehensive National Science CenterHefei230031China

Photooxidation provides a promising strategy for removing the dominant indoor pollutant of HCHO,while the underlying photooxidation mechanism is still unclear,especially the exact role of H2O ***,we utilize in-situ spectral techniques to unveil the H2O-mediated HCHO photooxidation *** an example,the synthetic defective Bi2WO6 ultrathin sheets realize high-rate HCHO photooxidation with the assistance of H2O at room ***-situ electron paramagnetic resonance spectroscopy demonstrates the existence of•OH radicals,possibly stemmed from H2O oxidation by the photoexcited ***-radiation vacuum ultraviolet photoionization mass spectroscopy and H218O isotope-labeling experiment directly evidence the formed•OH radicals as the source of oxygen atoms,trigger HCHO photooxidation to produce CO2,while in-situ Fourier transform infrared spectroscopy discloses the HCOO*radical is the main photooxidation ***-functional-theory calculations further reveal the•OH formation process is the rate-limiting step,strongly verifying the critical role of H2O in promoting HCHO *** work first clearly uncovers the H2O-mediated HCHO photooxidation mechanism,holding promise for high-efficiency indoor HCHO removal at ambient conditions.

关键词： mechanistic study H_(2)O-mediated HCHO photooxidation room temperature

Precisely quantifying bulk transition metal valence evolution in conventional battery electrode by inverse partial fluorescence yield

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Journal of Energy Chemistry 2022年第6期31卷 363-368,I0010页

作者： Kehua Dai weiwei shao Beibei Zhao Wenjuan Zhang Yan Feng Wenfeng Mao Guo Ai Gao Liu Jing Mao Wanli Yang College of Chemistry Tianjin Normal UniversityTianjin 300387China Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720United States College of Physics and Materials Science Tianjin Normal UniversityTianjin 300387China Energy Storage and Distributed Resources Division Energy Technologies AreaLawrence Berkeley National LaboratoryBerkeleyCA 94720United States School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

Precisely quantifying transition metal(TM) redox in bulk is a key to understand the fundamental of optimizing cathode materials in secondary batteries. At present, the commonly used methods to probe TM redox are hard X-ray absorption spectroscopy(hXAS) and soft X-ray absorption spectroscopy(sXAS).However, they are both facing challenges to precisely quantify the valence states of some transition metals such as Mn. In this paper, Mn-L iPFY(inverse partial fluorescence yield) spectra extracted from Mn-L m RIXS(mapping of resonant inelastic X-ray scattering) is adopted to quantify Mn valence states. Mn-L i PFY spectra has been considered as a bulk-sensitive, non-distorted probe of TM valence ***, the exact precision of this method is still unclear in quantifying practical battery ***, a series of LiMn_(2)O_(4) electrodes with different charge and discharge states are prepared. Based on their electrochemical capacity(generally considered to be very precise), the precision of Mn iPFY in quantifying bulk Mn valence state is confirmed, and the error range is unraveled. Mn-L mRIXS iPFY thus is identified as one of the best methods to quantify the bulk Mn valence state comparing with hXAS and sXAS.

关键词： Cathode materials Valence state of transition metals Lithium-ion batteries Mapping of resonant inelastic X-ray scattering Inverse partial fluorescence yield

Urban flood inundation and damage assessment based on numerical simulations of design rainstorms with different characteristics

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Science China(Technological Sciences) 2020年第11期63卷 2292-2304页

作者： MEI Chao LIU JiaHong WANG Hao LI ZeJin YANG ZhiYong shao weiwei DING XiangYi WENG BaiSha YU YingDong YAN DianYi State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China Engineering and Technology Research Center for Water Resources and Hydroecology of the Ministry of Water Resources Beijing 100044China

In the context of global climate change and urbanization,urban flooding is an important type of natural disaster that affects urban development,especially in China,which is experiencing rapid *** the past 10 years,urban flooding events have caused huge disaster losses in Chinese *** has resulted in significant negative effects on the urban infrastructure,socioeconomic systems,and urban residents,thus causing widespread *** have confirmed the change in extreme rainstorms is due to the changing environments in many cities *** studies on the impact of these rainstorms with different characteristics for urban flooding is valuable for coping with unfavorable *** addition,numerical simulations provide an economical and viable means to perform these *** paper presents a numerical model of Xiamen Island in *** were conducted for 12 design rainstorm events with different return periods,rain patterns,and *** results indicate that,in the case of an equal rainfall amount,the rainfall intensity is the key factor that affects the inundated area,depth,and ***,the rainfall intensity is not the only determining factor;the rainfall pattern also affects the *** regard to the rainfall pattern,a higher rainfall peak coefficient usually leads to severe urban inundation and *** a result,the lag time would be shorter,which may further exacerbate the impact of urban flood *** results of this study provide insights into managing flood risks,developing urban flood prevention strategies,and designing flood prevention measures.

关键词： urban flood flood damage assessment flood disaster management numerical simulations design rainstorms

Plastics-to-syngas photocatalysed by Co-Ga2O3 nanosheets

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National Science Review 2022年第9期9卷 230-237页

作者： Jiaqi Xu Xingchen Jiao Kai Zheng weiwei shao Shan Zhu Xiaodong Li Junfa Zhu Yang Pan Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sciences at Microscale National Synchrotron Radiation Laboratory University of Science and Technology of China Key Laboratory of Green Chemistry &Technology Ministry of Education College of Chemistry Sichuan University Institute of Energy Hefei Comprehensive National Science Center

Plastics take hundreds of years to degrade naturally,while their chemical degradation typically requires high temperature and ***,we first utilize solar energy to realize the sustainable and efficient plastic-to-syngas conversion with the aid of water at ambient *** an example,the commercial plastic bags could be efficiently photoconverted into renewable syngas by Co-Ga2O3nanosheets,with hydrogen and carbon monoxide formation rates of 647.8 and 158.3μmol *** situ characterizations and labelling experiments unveil water is photoreduced into hydrogen,while non-recyclable plastics including polyethylene bags,polypropylene boxes and polyethylene terephthalate bottles are photodegraded into carbon dioxide,which is further selectively photoreduced into carbon ***-depth investigation illustrates that the efficiency of syngas production mainly depends on the carbon dioxide reduction process and hence photo catalysts of high carbon dioxide reduction activity should be designed to promote the efficiency of plastic-to-syngas conversion in the *** concept for the photoreforming of non-recyclable plastics into renewable syngas helps to eradicate ’white pollution’ and alleviate the energy crisis simultaneously.

关键词： commercial plastics syngas photoconversion CO2 reduction ambient conditionsion

Metal^(n+)-Metal^(δ+) pair sites steer C-C coupling for selective CO_(2) photoreduction to C_(2) hydrocarbons

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Nano Research 2022年第3期15卷 1882-1891页

作者： weiwei shao Xiaodong Li Juncheng Zhu Xiaolong Zu Liang Liang Jun Hu Yang Pan Junfa Zhu Wensheng Yan Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sciences at Microscale CAS Centre for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

The major obstacle for selective CO_(2)photoreduction to C_(2)hydrocarbons lies in the difficulty of C–C coupling,which is usually restrained by the repulsive dipole–dipole interaction between adjacent carbonaceous ... 详细信息

关键词： C–C coupling pair sites CO_(2)photoreduction ethylene

Toxic Effects of Three Heavy Metallic Ions on Rana zhenhaiensis Tadpoles

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Asian Herpetological Research 2015年第2期6卷 132-142页

作者： Li WEI Guohua DING Sainan GUO Meiling TONG Wenjun CHEN Jon FLANDERS weiwei shao Zhihua LIN College of Ecology Lishui University School of Biological Sciences Bristol Life Sciences Building University of Bristol

Heavy metal pollution is widespread in some areas of China and results in contamination of land, water, and air with which all living organisms interact. In this study, we used three heavy metallic ions （Cu^2＋, Pb^2＋ and Zn^2＋） to assess their toxicity effects on mortality, blood biomarker and growth traits （body length and body mass） of Rana zhenhaiensis tadpoles. The results showed that the toxicity levels of the three metallic ions were different when conducted with different experiment designs. For acute toxicity tests, Cu^2＋ was the most toxic with the highest tadpole mortality. The mortalities of tadpoles showed significant differences among the treatments at the same exposure time endpoints （24, 48, 72 and 96h）. Results from repeated measures ANOVA indicated that metallic ion concentration, exposure time and their interactions significantly affected the mortalities of R. zhenhaiensis tadpoles. Also, the toxicity effects of all binary combinations of the three metallic ion treatments showed synergism. The half lethal concentrations （LCs0） decreased with increasing exposure time during the experimental period, and the safe concentration （SC）values of Cu^2＋, Pb^2＋ and Zn^2＋ were different from each other. Combined and compared LC50 values with previous data reported, it is suggestes that the toxicity levels of metal pollution to anuran tadpoles should be species-and age-related. For blood biomarker tests, Zn^2＋ was the most toxic with the highest total frequencies of abnormal erythrocytic nucleus. All three metallic ions caused higher abnormal erythrocytic nucleus compared with control groups. In a chronic toxicity test, Pb^2＋ was the most toxic with lowest growth traits. Survival rate （except for 18 days）, total body length and body mass showed significant differences among the treatments. These findings indicated that tadpoles of R. zhenhaiensis should be as a bioindicator of heavy metals pollution.

关键词： Acute toxicity micronuclcus chronic toxicity growth metal pollution Rana zhenhaiensis

A MATCH MADE IN MALAYSIA

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China Report ASEAN 2019年第5期4卷 32-33页

作者： shao weiwei Pan Yingqiu 不详

As the sun dipped below the skyline of buildings composing the Xiamen University Malaysia Campus, Zhang Ke walked Limi Cally back to her car. They were not teachers or students at the satellite campus of Xiamen University, based in its namesake city in southeastern China’s Fujian Province, but builders of the second phase of the campus.

关键词： buildings Xiamen University Malaysia Campus China’s Fujian

Characterization and spatial analysis of coseismic landslides triggered by the Luding Ms 6.8 earthquake in the Xianshuihe fault zone, Southwest China

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Journal of Mountain Science 2024年第1期21卷 160-181页

作者： GUO Changbao LI Caihong YANG Zhihua NI Jiawei ZHONG Ning WANG Meng YAN Yiqiu SONG Deguang ZHANG Yanan ZHANG Xianbing WU Ruian CAO Shichao shao weiwei Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesBeijing 100081China Research Center of Neotectonism and Crustal Stability China Geological SurveyBeijing 100081China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Sichuan Institute of Geological Survey Chengdu 610081China

On September 5, 2022, a magnitude Ms 6.8 earthquake occurred along the Moxi fault in the southern part of the Xianshuihe fault zone located in the southeastern margin of the Tibetan Plateau,resulting in severe damage and substantial economic loss. In this study, we established a coseismic landslide database triggered by Luding Ms 6.8 earthquake, which includes 4794 landslides with a total area of 46.79 km^(2). The coseismic landslides primarily consisted of medium and small-sized landslides, characterized by shallow surface sliding. Some exhibited characteristics of high-position initiation resulted in the obstruction or partial obstruction of rivers, leading to the formation of dammed lakes. Our research found that the coseismic landslides were predominantly observed on slopes ranging from 30° to 50°, occurring at between 1000 m and 2500 m, with slope aspects varying from 90° to 180°. Landslides were also highly developed in granitic bodies that had experienced structural fracturing and strong-tomoderate weathering. Coseismic landslides concentrated within a 6 km range on both sides of the Xianshuihe and Daduhe fault zones. The area and number of coseismic landslides exhibited a negative correlation with the distance to fault lines, road networks, and river systems, as they were influenced by fault activity, road excavation, and river erosion. The coseismic landslides were mainly distributed in the southeastern region of the epicenter, exhibiting relatively concentrated patterns within the IX-degree zones such as Moxi Town, Wandong River basin, Detuo Town to Wanggangping Township. Our research findings provide important data on the coseismic landslides triggered by the Luding Ms 6.8 earthquake and reveal the spatial distribution patterns of these landslides. These findings can serve as important references for risk mitigation, reconstruction planning, and regional earthquake disaster research in the earthquake-affected area.

关键词： Luding earthquake Coseismic landslides Remote sensing interpretation Spatial distribution Xianshuihe fault Earthquake fault