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functional groups to modify g-C3N4 for improved photocatalytic activity of hydrogen evolution from water splitting

Chinese Chemical Letters 2020年第6期31卷 1648-1653页

作者： Fan Yu Laichun Wang Qiuju Xing Dengke Wang Xunheng Jiang Guangchao Li Anmin Zheng Fanrong Ai Jian-Ping Zou Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China School of Mechanical&Electronic Engineering Nanchang UniversityNanchang 330031 China

Rational modification by functional groups was regarded as one of efficient methods to improve the photocatalytic performance of graphitic carbon nitride(g-C3 N4).Herein,g-C3 N4 with yellow(Y-GCN)and brown(C-GCN)were prepared by using the fresh urea and the urea kept for five years,respectively,for the first *** results show that the H2 production rate of the C-GCN is 39.06μmol/h,which is about 5 times of the ***,in terms of apparent quantum efficiency(AQ.E)at 420 nm,C-GCN has a value of 6.3%and nearly 7.3 times higher than that of Y-GCN(0.86%).The results of XRD,IR,DRS,and NMR show,different from Y-GCN,a new kind of functional group of—N=CH—was firstly in-situ introduced into the C-GCN,resulting in good visible light absorption,and then markedly improving the photocatalytic *** calculation also confirms the effect of the—N=CH—group band structure of ***,XPS results demonstrate that the existence of—N=CH—groups in C-GCN results in tight interaction between C-GCN and Pt nanoparticles,and then improves the charge separation and photocatalytic *** present work demonstrates a good example of"defect engineering"to modify the intrinsic molecular structure of g-C3N4 and provides a new avenue to enhance the photocatalytic activity of g-C3N4 via facile and environmental-friendly method.

关键词： functional groups Graphitic carbon nitride Hydrogen evolution Photocatalysis Synthesis

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Manipulating functional groups between polyvinylidene difluoride and nanoparticles for high-performance triboelectric nanogenerator

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Nano Research 2023年第9期16卷 11855-11861页

作者： Zekun Li Lu Zhang Lihao Guo Wenwen Hu Aifang Yu Junyi Zhai CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China School of Advanced Materials and Nanotechnology Interdisciplinary Research Center of Smart SensorsXidian UniversityXi’an 712000China School of Aerospace Science and Technology Xidian UniversityXi’an 712000China

Interface functional groups play an essential role in regulating the electrical properties of bulk *** this work,we designed a novel strategy to explore a new way to enhance triboelectric performance by regulating the functional groups between nano-fillers and polymer matrix without obvious changes in the dielectric *** silica nanoparticles(SNPs)modified perfluoro-silane coupling agents(PFSCAs)with different chain lengths were added to the polyvinylidene difluoride to regulate the transferred charge density(TCD)of triboelectric nanogenerators(TENGs).When the doping concentration of perfluorodecyl modified SNPs is 2.25 wt.%,the nanocomposite film based TENG exhibits the maximum TCD of 166μC/m^(2)and power density of 3.12 W/m^(2)which are 6 times and 39 times as big as those of pure polyvinylidene difluoride(PVDF)*** charge accumulation and decay process show that interface functional groups dominate the performance of ***,a Fermi level model is proposed and why the TCD could be regulated by the concentration of nanoparticles in bulk materials is *** work provides a new concept for understanding the performance of TENG independent dielectric constant and points out a new direction for enhancing TENG’s performance,since wealthy functional groups with selectivity are applicable.

关键词： triboelectric nanogenerators functional groups surface modification interfacial regulation transferred charge density

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Effects of functional groups for CO_(2) capture using metal organic frameworks

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Frontiers of Chemical Science and Engineering 2021年第2期15卷 437-449页

作者： Chenkai Gu Yang Liu Weizhou Wang Jing Liu Jianbo Hu State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemical and Biomolecular Engineering Georgia Institute of TechnologyAtlantaGA 30332-0100USA Henan Key Laboratory of Function-Oriented Porous Materials College of Chemistry and Chemical EngineeringLuoyang Normal UniversityLuoyang 471934China

Metal organic frameworks(MOFs)are promising adsorbents for CO_(2)*** groups on organic linkers of MOFs play important roles in improving the CO_(2) capture ability by enhancing the CO_(2) sorption *** this work,the functionalization effects on CO_(2) adsorption were systematically investigated by rationally incorporating various functional groups including–SO3H,–COOH,–NH_(2),–OH,–CN,–CH_(3) and–F into a MOF-177 template using computational *** of electron density on the functionalized linkers were intensified,introducing significant enhancements of the CO_(2) adsorption ability of the modified *** addition,three kinds of molecular interactions between CO_(2) and functional groups were analyzed and summarized in this ***,our results reveal that–SO_(3)H is the best-performing functional group for CO_(2) capture in MOFs,better than the widely used–NH_(2) or–F *** current study provides a novel route for future MOF modification toward CO_(2) capture.

关键词： metal-organic frameworks functional groups CO_(2)capture GCMC DFT

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Characterization and comparison of organic functional groups effects on electrolyte performance for vanadium redox flow battery

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Frontiers of Chemical Science and Engineering 2023年第9期17卷 1221-1230页

作者： Ling Ge Tao Liu Yimin Zhang Hong Liu School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan430081China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium ResourcesWuhan University of Science and TechnologyWuhan430081China Collaborative Innovation Center of Strategic Vanadium Resources Utilization Wuhan University of Science and TechnologyWuhan430081China Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource Wuhan University of Science and TechnologyWuhan430081China

The vanadium redox flow battery with a safe and capacity-controllable large-scale energy storage system offers a new method for the *** this case,acetic acid,methane sulfonic acid,sulfonic acid,amino methane sulfonic acid,and taurine are used to overcome the low electrolyte energy density and stability limitations,as well as to investigate the effects of various organic functional groups on the vanadium redox flow *** compared to the pristine electrolyte(0.22 Ah,5.0 Wh·L^(−1),85.0%),the results show that taurine has the advantage of maintaining vanadium ion concentrations,discharge capacity(1.43 Ah),energy density(33.9 Wh·L^(−1)),and energy efficiency(90.5%)even after several *** acetic acid electrolyte is more conducive to the low-temperature stability of the V(II)electrolyte(177 h at−25℃)than pristine(82 h at−2℃).The−SO_(3)H group,specifically the coaction of the−NH_(2)and−SO_(3)H groups,improves electrolyte ***−NH_(2)and−COOH additive groups improved conductivity and electrochemical activity.

关键词： vanadium redox flow battery functional groups organic additives energy density stability

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Submerged vegetation removal promotes shift of dominant phytoplankton functional groups in a eutrophic lake

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Journal of Environmental Sciences 2014年第8期26卷 1699-1707页

作者： Jing Dong Kai Yang Shuangshuang Li Genbao Li Lirong Song State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of Sciences University of Chinese Academy of Sciences Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

Historical data indicate that the dominance of submerged plants in Dianchi Lake in the 1960 s was characterized by low algal density with dominance of non-toxic group J（Scenedesmus,Pediastrum,etc.）. The removal of submerged plants,which began in the 1970 s,resulted in the expansion of bloom-forming Microcystis（group M）. Laboratory experiments suggested that Microcystis aeruginosa was inclined to grow and develop at elevated temperatures. The growth of Scenedesmus obliquus was slower than that of co-cultivated M. aeruginosa in the absence of Ceratophyllum demersum,especially at higher temperatures. The existence of submerged plant C. demersum could inhibit the growth of the harmful algae M. aeruginosa and this inhibitory effect by C. demersum was enhanced with an increase in temperature. Instead,with C. demersum,the growth of S. obliquus was not inhibited,but the co-cultivated M. aeruginosa was eliminated in a short time. Combined with the historical data and laboratory experiments,it was indicated that the submerged plants might play important roles in the dominance of the non-toxic group J in the historical succession. Consequently,the introduction of the submerged plant such as C. demersum might alter the dominant phytoplankton functional groups from M to J and benefit the restoration of the eutrophic lake.

关键词： Submerged vegetation Phytoplankton functional groups

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Overstory functional groups indicate the legacy of land use in a secondary tropical forest in southwestern China

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Journal of Forestry Research 2024年第5期35卷 91-105页

作者： Yun Deng Wenfu Zhang Min Cao Jinlong Dong Hui Chen Xiaobao Deng Jiajia Liu Xiaoyang Song Shangwen Xia Liqing Sha Shengdong Yuan Luxiang Lin CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303People’s Republic of China Center for Plant Ecology Core Botanical GardensChinese Academy of SciencesMengla 666303People’s Republic of China National Forest Ecosystem Research Station at Xishuangbanna Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303People’s Republic of China Department of Life Sciences Fudan UniversityShanghai 570228People’s Republic of China Department of Life Sciences University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

Anthropogenic disturbances are widespread in tropical forests and influence the species composition in the ***,the impacts of historical disturbance on tropical forest overstory recovery are unclear due to a lack of disturbance data,and previous studies have focused on understory *** this study,the purpose was to deter-mine the influence of historical disturbance on the diver-sity,composition and regeneration of overstory species in present *** the 20-ha Xishuangbanna tropical sea-sonal rainforest dynamics plot in southwestern China,the historical disturbance boundaries were delineated based on panchromatic photographs from *** that drove species clustering in the overstory layer(DBH≥40 cm)were analyzed and the abundance,richness and composition of these species were compared among different tree groups based on multiple regression tree *** coefficient of variation of the brightness value in historical panchro-matic photographs from 1965 was the primary driver of spe-cies clustering in the overstory *** abundance and richness of overstory species throughout the regeneration process were similar,but species composition was always *** the proportion of large-seeded and vigorous-sprouting species showed no significant differ-ence between disturbed and undisturbed forests in the tree-let layer(DBHfunctional group composition in the overstory and the recovery of overstory species was *** group composi-tion can better indicate the dynamics of overstory species replacement during secondary succession.

关键词： Historical disturbance Legacy effects Secondary forests Overstory species functional groups

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Nb_(2)CT_(x) MXene: High capacity and ultra-long cycle capability for lithium-ion battery by regulation of functional groups

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Journal of Energy Chemistry 2021年第2期30卷 387-395,I0013页

作者： Jiabao Zhao Jing Wen Junpeng Xiao Xinzhi Ma Jiahui Gao Lina Bai Hong Gao Xitian Zhang Zhiguo Zhang Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025HeilongjiangChina School of Instrumentation Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

MXenes are well known for their potential application in supercapacitors due to their high-rate intercalation pseudocapacitance and long ***,the reported low capacity of pristine MXenes hinders their practical application in lithium-ion *** this work,a robust strategy is developed to control the functional groups of Nb_2 CT_x *** capacity of pristine Nb_2 CT_x MXene can be significantly increased by Li~+ intercalation and surface *** specific capacity of the treated Nb_2 CT_x is up to 448 mAh g^(-1) at 0.05 A g^(-1),and at a large current density of 2 A g^(-1) remains a high reversible capacity retention rate of 75% after an ultra-long cycle of 2000 *** values exceed most of the reported pristine MXenes(including the most studied Ti_3 C_2 T_x) and carbon-based *** demonstrates that this strategy has great help to improve the electrochemical performance of pristine MXene,and the results enhance the promise of MXenes in the application of lithium-ion batteries.

关键词： MXene Nb_(2)CT_(x) functional groups Lithium-ion batteries

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Biomass Allocation Patterns of Alpine Grassland Species and functional groups along a Precipitation Gradient on the Northern Tibetan Plateau

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Journal of Mountain Science 2013年第6期10卷 1097-1108页

作者： WU Jian-shuang SHEN Zhen-xi ZHANG Xian-zhou SHI Pei-li Lhasa National Ecological Research Station Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of sciences

Variations in the fractions of biomass allocated to functional components are widely considered as plant responses to resource availability for grassland plants. Observations indicated shoots isometrically relates to roots at the community level but allometrically at the species level in Tibetan alpine grasslands. These differences may result from the specific complementarity of functional groups between functional components, such as leaf, root, stem and reproductive organ. To test the component complementary responses to regional moisture variation, we conducted a multi-site transect survey to measure plant individual size and component biomass fractions of common species belonging to the functional groups： forbs, grasses, legumes and sedges on the Northern Tibetan Plateau in peak growing season in 2010. Along the mean annual precipitation （MAP） gradient, we sampled 7o species, in which 2o are in alpine meadows, 20 in alpine steppes, 15 in alpine desert-steppes and 15 in alpine deserts, respectively. Our results showed that the size of alpine plants is small with individual biomass mostly lower than 1.0 g. Plants keep relative conservative component individual responses moisture functional fractions across alpine grasslands at the level. However, the complementary between functional components to variations specifically differ among groups. These results indicate that functional group diversity may be an effective tool for scaling biomass allocation patterns from individual up to community level. Therefore, it is necessary andvaluable to perform intensive and systematic studies on identification and differentiation the influences of compositional changes in functional groups on ecosystem primary services and processes.

关键词： Biomass fractions Complementaryresponse functional components functional groups Changtang Plateau

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Spatiotemporal Patterns and Dynamics of Species Richness and Abundance of Woody Plant functional groups in a Tropical Forest Landscape of Hainan Island,South China

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Journal of Integrative Plant Biology 2008年第5期50卷 547-558页

作者： Zhi-Dong Zhang Run-Guo Zang Yao-Dong Qi Key Laboratory of Forest Ecology and Environment the State Forestry Administration Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry Beijing 100091 China Yantai Institute of Coastal Zone Research for Sustainable Development the Chinese Academy of Sciences Yantai 264003 China

Tropical forests are among the most species-diverse ecosystems on Earth. Their structures and ecological functions are complex to understand. functional group is defined as a group of species that play similar roles in an ecosystem. The functional group approach has been regarded as an effective way of linking the compositions of complex ecosystems with their ecological functions. To understand the variation of functional groups in species-rich ecosystems after disturbance, the present study investigated the spatial pattern and temporal dynamics of woody plants in a typically fragmented natural forest landscape of Hainan Island in South China. The study area was classified into eight landscape types based on vegetation type, disturbance manner and the time of recovery. The woody plant species were aggregated into seven functional groups based on the growth form, successional status and plant size. The results gained from the present study showed that all functional groups, except for the emergent and canopy tree species, were present in all eight landscape types. Each landscape type had different numbers of dominant functional groups. There are similar species richness and stem abundance structure among functional groups between mid-successional clear cut lowland rainforest and old growth tropical coniferous forest. This similarity exists in selective logged lowland rainforest and old-growth lowland rainforest, as well as among landscape types of montane rainforest. The functional groups with the same successional status had similar patterns of species richness and stem abundance ratios among different landscape types. The variation patterns of functional groups along the successional stages in terms of species richness and stem abundance among the tropical lowland rainforest landscape types were more similar to each other than those in the tropical montane rainforest landscape types. This study provides further support for the competition-colonization tradeoff and

关键词： forest landscape types functional groups Hainan Island recovery dynamics spatial variation species diversity stem abundance tropical forests,

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Seed germination traits of two plant functional groups in the saline deltaic ecosystems

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Journal of Plant Ecology 2011年第3期4卷 169-177页

作者： Xiao-dong Zhang Wen-ting Xu Bo Yang Ming Nie Bo Li Coastal Ecosystems Research Station of the Yangtze River Estuary Ministry of Education Key Laboratory for Biodiversity Science and Ecological EngineeringInstitute of Biodiversity ScienceFudan University220 Handan RoadShanghai 200433People’s Republic of China

Aims Salt stress resulting from soil salinization is one of the driving forces of the land degradation throughout the *** modern Yellow River delta is one of the most saline areas in *** can be an effective way to restore the salinized ecosystems,which requires selecting appropriate plant *** study explored the germination responses of common plant species from contrasting habitats in the Yellow River delta to varying salinity,offering experimental information for ecosystem restoration in the Yellow River *** In this study,15 common plant species from the Yellow River delta were divided into two groups(high-salinity and low-salinity groups)by their natural habitats using Canonical Correlation *** of each species were treated with five salinity levels(0,5,10,20 and 30 ppt),using a randomized complete block design,and germinated seeds were counted and removed daily for 28 days to calculate the final germination proportion and mean time to *** germination responses of seeds to salinity treatments were compared between the two *** Findings In relation to salinity,seed germination behavior of the test species was closely related to the salinity level of the habitats over which they were *** from the habitats with higher salinity had generally higher final germination proportion but shorter mean time to germination than those from the habitats with lower salinity in all of five salinity treatments *** final germination proportion and mean time to germination of low-salinity group species were more sensitive to salinity than those of high-salinity group *** the species with high final germination proportion and short mean time to germination is important for restoration of salinized land.

关键词： deltaic ecosystems functional groups germination traits restoration salinity

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