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Pomegranate-like porous NiCo_(2)Se_(4) spheres with N-doped carbon as advanced anode materials for Li/Na-ion batteries

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Green Energy & Environment 2022年第3期7卷 554-565页

作者： Xin Liu Liwen Yang guobao xu Juexian Cao School of Physics and Optoelectronics&Hunan Institute of Advanced Sensing and Information Technology Xiangtan UniversityXiangtan411105China School of Materials Science and Engineering Xiangtan UniversityXiangtan411105China

Design and preparation of dual-role anode materials with extraordinary performance for rechargeable Li/Na-ion batteries (LIBs/NIBs) remains highly challenging.Herein,three-dimensional (3D) pomegranate-like porous bimetallic NiCo_(2)Se_(4) spheres with N-doped carbon (termed as NC@NiCo_(2)Se_(4)) are synthesized by solvothermal method and annealing.Microstructure investigations reveal that the NC@NiCo_(2)Se_(4) spheres include nano-sized NiCo_(2)Se_(4) particles as inner core and NiCo_(2)Se_(4) with the modification of thin-walled N-doped carbon layer as inner/outer shell.The bimetallic NC@NiCo_(2)Se_(4) spheres possess synergistic interaction of Ni/Co atoms to enhance intrinsic conductivity and electrochemical activity,unique pomegranate-like structure with an inner void space and robust shell to mitigation volume expansion,and intimate contact of N-doped carbon layer to improve interface effect and accelerate conversion kinetics.As anode materials,the NC@NiCo_(2)Se_(4) exhibits superior lithium/sodium storage performances (1401.6 and 794.8 mA h g^(-1)at current density of 0.5 and 5 A g^(-1)after 500 cycles for LIBs as well as 433.9 mA h g^(-1)at 3 A g^(-1)after 1000 cycles and a high capability of 306.6 mA h g^(-1)at 20 A g^(-1)for NIBs).This work represents an impressive strategy for future research of bimetallic selenides as anode materials for advanced high-performance LIBs/NIBs.

关键词： kinetics spheres porous

Gap engineering of sandwich plasmonic gap nanostructures for boosting plasmon-enhanced electrocatalysis

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Nano Research 2023年第7期16卷 8961-8969页

作者： Lu Cheng Fengxia Wu Yu Tian Xiali Lv Fenghua Li guobao xu Hsien-Yi Hsu Yongjun Zhang Wenxin Niu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Yanshan Branch of Beijing Chemical Research Institute SinopecBeijing 102500China University of Science and Technology of China Hefei 230026Chin a 4 School of Energy and Environment Department of Materials Science and EngineeringCity University of Hong KongKowloon TongHong Kong 999077China Shenzhen Research Institute of City University of Hong Kong Shenzhen 518057China Key Laboratory of Functional Polymer Materials and State Key Laboratory of Medicinal Chemical Biology Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China

Plasmonic catalysis is emerging as a dynamic field in heterogeneous catalysis and holds great promise for the efficient utilization of solar energy.Central to the development of plasmonic catalysis is the design of efficient plasmonic nanocatalysts.In this report,plasmonic gap nanostructures(PGNs)on the basis of Au@poly(o-phenylenediamine)(POPD)@Pd sandwich nanostructures are synthesized as plasmonic nanocatalysts by an in-situ reduction synthetic strategy,which allows for the precise engineering of the POPD gap size between plasmonic Au and catalytic Pd components.The introduction of conducting POPD nanogap in PGNs not only effectively enhances their light harvesting capability,but also provides an effective charge transfer channel for harnessing the photogenerated hot charge carriers.In this respect,distinct gap-dependent performances in plasmon-enhanced electrocatalysis of ethanol oxidation reactions(EOR)are demonstrated with the PGN nanocatalysts and over 2.5 folds of enhancement can be achieved.A volcano plot is derived to describe the relationship between the catalytic activities and gap size of the PGN nanocatalysts,which is well explained by the interplay of their light harvesting and charge transport capabilities.These results highlight the importance of gap engineering in PGNs for plasmonic catalysis and offer the promise of developing efficient plasmonic nanocatalysts for other heterogeneous catalytic reactions.

关键词： plasmonic gap nanostructures electrocatalysis ethanol oxidation reactions light harvesting charge transport

Long-term mercury variations in tree rings of the permafrost forest,northeastern China

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Science China Earth Sciences 2022年第7期65卷 1328-1338页

作者： Huhu KANG Xiaohong LIU Junming GUO Qiuliang ZHANG Yabo WANG Jie HUANG guobao xu Guoju WU Wensen GE Shichang KANG State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Geography and Tourism Shaanxi Normal UniversityXi'an 710119China University of Chinese Academy of Sciences Beijing 100049China Forest College Inner Mongolia Agricultural UniversityHohhot 010018China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China

Permafrost is a potential mercury(Hg)pool released by thawing,which can raise the risk of Hg pollution under global warming.Tree rings are useful archives of environment-specific Hg exposure over long periods.We determined Hg concentrations in tree rings of two dominant tree species(Larix gmelinii Rupr.and Pinus sylvestris var.mongolica)at permafrost sites in northeastern China.The biweighted mean Hg concentrations ranged from 0.36 to 3.96 ng g^(-1) from 1840 to 2014.The tree-ring width had no significant influence on the Hg concentration.Larch Hg increased slightly before the 1970 s and peaked in the 1990 s.However,the pine Hg concentration increased continuously until the 1930 s,decreased rapidly until the 1970 s,then rose to a peak in the late 1980 s.The change of Hg concentrations in larch and pine revealed a time offset of 4 to 5 years,which implied possibly high mobility of Hg in pine tree rings.Higher Hg concentrations from 1920 to 1960 and subsequent decreases in isolated permafrost forests revealed the local geographical Hg cycling history.Lower Hg concentrations and faster increases in larch suggest the role of additional winter Hg loading for the evergreen pine and species-specific differences in root absorption in response to melting permafrost.Our results highlight possible geographical impacts on tree-ring Hg records,improve understanding of Hg cycles in permafrost forest,and suggest a need to sample additional species in a range of permafrost environments.

关键词： Tree rings Mercury Long-term variations Larch Pine Geographic environment Permafrost forest

Recent advances in electrochemiluminescence imaging analysis

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eScience 2022年第6期2卷 591-605页

作者： Chengda Meng Sara Knežević Fangxin Du Yiran Guan Frédéric Kanoufi Neso Sojic guobao xu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China University of Science and Technology of Chin1 HefeiAnhui 230026China University of Bordeaux Bordeaux INPCNRSUMR 5255Site ENSCBP33607 PessacFrance UniversitéParis Cité ITODYSCNRSF-75013 ParisFrance

Electrochemiluminescence(ECL)has been widely applied in imaging owing to features that distinguish it from other microscopic techniques and electrochemical methods,including its high signal-to-noise ratio,remarkable sensitivity,wide linear range,high spatiotemporal resolution,and near-zero background light.Imaging technology based on ECL has been used in the fields of immunosensing,pathological cell detection,and drug analysis.Additionally,its simple operation and ability to detect dynamic processes and catalytic sites strengthen its potential for research on material surfaces and interfaces,in vivo biological analysis,and cell visualization.At the same time,the emergence of a variety of nanomaterials and new microscopic analysis equipment has further promoted the development of high-resolution ECL imaging technology.This paper introduces the development of ECL technology and the mechanisms of the main ECL systems.It then describes various forms of ECL imaging methods,and reviews research progress on ECL imaging technology in the fields of single-particle imaging,fingerprint structure analysis,and single-cell microscopic imaging.Finally,the authors offer their views about the prospects for ECL imaging technology.

关键词： Electrochemiluminescence Imaging Single-entity electrochemiluminescence Single-molecule reaction Single cell

Chemiluminescence and electrochemiluminescence applications of metal nanoclusters

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Science China Chemistry 2016年第7期59卷 794-801页

作者： Shuang Han Zhichao Zhang Suping Li Liming Qi guobao xu College of Applied Chemistry Shenyang University of Chemical Technology State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences University of the Chinese Academy of Sciences Chinese Academy of Sciences

Due to strong photoluminescence,extraordinary photostability,excellent biocompatibility,and good water-solubility,metal nanoclusters have attracted enormous attention since discovered.They are found to be novel fluorescence labels for biological applications and environmental monitoring.Recently the chemiluminescence(CL) or electrochemiluminescence(ECL) of metal nanoclusters has received increasing attention.This review covers recent vibrant developments in this field of the past 5 years,and highlights different functions of metal nanoclusters in various CL and ECL systems,such as luminophores,catalysts,and quenchers.Latest synthetic methods of metal nanoclusters used in CL or ECL are also summarized.Furthermore,we discuss some perspectives and critical challenges of this field in the near future.

关键词：电化学发光金属团簇纳米簇应用生物相容性纳米团簇 ECL 光致发光

Increased mercury pollution revealed by tree rings from the China's Tianshan Mountains

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Science Bulletin 2018年第20期63卷 1328-1331页

作者： Huhu Kang Xiaohong Liu Junming Guo guobao xu Guoju Wu Xiaomin Zeng Bo Wang Shichang Kang State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Geography and Tourism Shaanxi Normal UniversityXi'an 710119China University of Chinese Academy of Sciences Beijing 100049China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100049China

Mercury (Hg)can be transported globally by the atmospheric circulation and it accumulates and biomagnifies along food chains [1,2].Due to its threats to human health and wildlife when converted to the neurotoxin methyl mercury,variations in Hg concentration in various ecosystems were paid more attention by scientists recently.Natural processes such as geothermal activities, volcanic activities,and weathering of Hg-containing rocks,can release a mass of Hg to the environment.Anthropogenic emissions had become the main atmospheric pollution source since the Industrial Revolution.A recent study indicated that half of the Hg presented in atmosphere was sourced from human activities and about 73%total mercury was released after 1850[3].Aiming to reduce the impact of Hg to environmental and human health,UNEP (United Nations Environment Programme)passed the Minamata Convention in 2013to limit Hg emission through contro|ling technologies on air pollution.

关键词： mercury pollution tree rings Tianshan Mountains

Electrochemiluminescence Imaging Techniques for Analysis and Visualizing

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Journal of Analysis and Testing 2020年第2期4卷 76-91页

作者： Tadesse Haile Fereja Fangxin Du Chao Wang Dmytro Snizhko Yiran Guan guobao xu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun 130022JilinPeople’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Department of Pharmacy College of Medicine and Health SciencesAmbo UniversityP.O.Box 19AmboEthiopia University of Science and Technology of China No.96Jin Zhai Road Baohe DistrictHefei 230026AnhuiPeople’s Republic of China Laboratory of Analytical Optochemotronics Kharkiv National University of Radio Electronics14 Nauka AveKharkiv 61166Ukraine

Electrochemiluminescence(ECL)-based imaging analysis is a dominant method to inspect the electrode composition,to study electrochemical reaction kinetics at a microscopic level,and also a rapid emerging technology in bioanalysis with high spatiotemporal resolutions,high-throughput and visualization characteristics.In comparison with other imaging microscopes,an optical excitation is not involved in imaging,thus the approach is free from background noise resulting in a low detec-tion limit.In this review work,the principle of ECL,its unique natures compared to other luminescence techniques were briefed at first.Then after,the progress and basic principles of ECL imaging were summarized.Furthermore,recent and representative advances of ECL imaging for visualizing and sensing applications were reviewed.Finally,the perspectives in ECL imaging for further perspective were discussed.

关键词： Electrogenerated chemiluminescence Coreactants Electrochemiluminescence imaging Bioanalysis

Ratiometric fluorescence detection of bleomycin based on proximity-dependent fluorescence conversion of DNA-templated silver nanoclusters

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Chinese Chemical Letters 2021年第2期32卷 906-909页

作者： Lingyuan Liu Shuyun Zhu Jing Sun Meng Xia Xian’en Zhao guobao xu College of Chemistry and Chemical Engineering Qufu Normal UniversityQufu 273165China Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810001China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

We design a ratiometric fluo rescent sensing platform for bleomycin(BLM) by using proximity-dependent DNA-templated silver nanoclusters(DNA-AgNCs) probe.This ratiometric sensing system is constructed with DNA-AgNCs as single fluorophore.The proposed strategy is based on the two following facts:(1) a covert DNA can approach and transform the DNA-AgNCs with green emission(G-DNA-AgNCs) into red emission through hybridization reaction.(2) The specific cleavage of the convert DNA by BLM in the presence of Fe(Ⅱ) inhibits the discoloration of G-DNA-AgNCs.Thus,benefiting from the specific recognition of BLM and unique properties of G-DNA-AgNCs,a hignly-sensitive ratiometric sensor for BLM has been successfully developed.The detection limit is as low as 30 pmol/L.This label-free fluorescence probe possesses advantages of convenient synthetic process and low cost.Moreover,this ratiometric method has been applied to the detection of BLM in human serum samples,illustrating a promising tool for analysis of BLM in cancer therapy.

关键词： Ratiometric nanosensor DNA-templated silver nanoclusters Fluorescence transformation Bleomycin DNA scission

Boric Acid-Based Dual Modulation Photoluminescent Glucose Sensor Using Thioglycolic Acid-Capped CdTe Quantum Dots

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Journal of Analysis and Testing 2017年第4期1卷 291-297页

作者： Saadat Majeed WenyueGao Jianping Lai Chao Wang JianpingLi Zhongyuan Liu guobao xu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun 130022JilinPeople’s Republic of China University of Chinese Academy of Sciences Chinese Academy of SciencesNo.19A YuquanluBeijing 100049China Division of Analytical Chemistry Institute of Chemical SciencesBahauddin Zakariya UniversityMultan 60800Pakistan College of Chemistry and Bioengineering Guilin University of TechnologyGuilin 541004People’s Republic of China

Most luminescent glucose sensors based on the interaction of glucose with organic boric acids or borates.Herein,a new luminescent glucose sensor is designed using thioglycolic acid-capped CdTe quantum dots in the presence of cheap inorganic boric acid.Both peak position and intensities change upon the addition of glucose because of the interaction of boric acid with glucose and thioglycolic acid-capped CdTe quantum dots,which enables glucose detection by either color change or intensity change.The luminescent intensities change linearly with glucose concentrations in the ranges from 0.03 to 1 mM and 1–25 mM with a detection limit of 10μM(S/N=3).Moreover,glucose concentrations can be conveniently detected by color change in the range from 1 mM–25 mM.It displays a highly selective response to glucose over other interfering but biologically important saccharides,amino acids,and common ions.Graphical Abstract A thioglycolic acid-capped CdTe QD-based sensor can detect glucose with wide linear range by change in intensity or color in the presence of cheap inorganic boric acid.

关键词： CdTe quantum dots Glucose sensor Thioglycolic acid