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Cu single atoms embedded on hollow g-C_(3)N_(4)nanospheres with enhanced charge transfer and separation for efficient photocatalysis

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Chinese Chemical Letters 2024年第2期35卷 455-459页

作者： linlin zhang Jianjun Liao Yakun Li Wei Sun Chengjun Ge Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province School of Ecology and EnvironmentHainan UniversityHaikou 570228China Shandong Ocean Chemical Industry Scientific Research Institute Weifang 262737China

Establishing an effective charge transfer mechanism in carbon nitride(g-C_(3)N_(4))to enhance its photocatalytic activity remains a limiting ***,the combination design of a single Cu atom with hollow g-C_(3)N_(4)nanospheres(Cu-N_(3)structure)has been proven to offer significant opportunities for this crucial ***,this structure endows two pathways for charge transfer in the reaction,namely,the N atoms in the three-dimensional planar structure are only bonded with a single Cu atom,and charge transfer occurs between the plane and the layered structure due to the bending of the interlayered g-C_(3)N_(4)hollow ***,Cu-N_(3)and hollow nanosphere structures have been certified to greatly enhance the efficiency of photogenerated carrier separation and transfer between the layers and planes by ultrafast spectral *** a result,this catalyst possesses unparalleled photocatalytic ***,the hydrogen production rate up to 2040μmol h^(−1) g^(−1),which is 51 times that of pure C_(3)N_(4)under visible light *** photocatalytic degradation performance of tetracycline and oxidation performance of benzene is also expressed,with a degradation rate of 100%,a conversion of 97.3%and a selectivity of 99.9%.This work focuses on the structure-activity relationship to provide the possibilities for the development of potential photocatalytic materials.

关键词： g-C_(3)N_(4) Cu single atom Hollow nanospheres Charge transfer pathways Photocatalytic hydrogen production

Oxidation and detection of L-cysteine using a modified Au/Nafion/glass carbon electrode

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Science China Chemistry 2011年第3期54卷 521-525页

作者： WANG XueJi zhang LiLi MIAO LiXiao KAN MeiXiu KONG linlin zhang HuiMin School of Science Beijing Institute of Technology Beijing 100081 China

In this work,the electrochemical oxidation of L-cysteine(CySH)was investigated on a composite film modified electrode with Au nanoparticles dispersed in the fluorocarbon polymer(Nafion).The excellent electrocatalytic effect on CySH oxidation was attributed to the role of Au *** voltammetric studies revealed two anodic peaks for the oxidation of CySH in the pH range of 2.0–*** electrode was used to detect cysteine at pH 2.0 and pH *** pH 2.0,a determination range of 3.0–50.0?mol/L was obtained with the detection sensitivity of 22.7A/(mmol L1),while at pH 7.0,a determination range of 2.0–80.0mol/L was obtained with the detection sensitivity of 4.08A/(mmol L1).The detection limits were estimated to be as low as 1.0?mol/L at both pH 7.0 and pH ***,at pH 7.0,the interferences of ascorbic acid and uric acid were reduced for the detection of *** made the Au/Nafion/GC electrode a promising candidate for efficient electrochemical sensors for the detection of CySH.

关键词： L-cysteine composite film gold nanoparticles Nafion detection

Phenylhydrazone anions excitation for the photochemical carbonylation of aryl iodides with aldehydes

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Chinese Chemical Letters 2024年第4期35卷 346-351页

作者： Lei Shen Yang zhang linlin zhang Chuanwang Liu Zhixian Ma Kangjiang Liang Chengfeng Xia Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of EducationYunnan Provincial Center for Research&Development of Natural ProductsSchool of PharmacyYunnan UniversityKunming 650500China

Spectroscopic investigations discovered that the in-situ generated phenylhydrazone anion was significantly bathochromically shifted to visible light region for photoactivation under irradiation. The photoexcited phenylhydrazone anion was potential to reduce aryl iodides via single electron transfer process for the subsequent radical chain reaction. A redox-neutral photochemical carbonylation of aryl iodides was developed on basis of the special spectroscopic features of phenylhydrazone anion. This protocol provided a convenient and efficient synthetic tool for accessing carbonylation products under redox neutral conditions without the need of transition-metals.

关键词： Organic anion Hydrazone Carbonylation Visible light Single electron transfer

Self-Powered Implantable Skin-Like Glucometer for Real-Time Detection of Blood Glucose Level In Vivo

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Nano-Micro Letters 2018年第2期10卷 151-161页

作者： Wanglinhan zhang linlin zhang Huiling Gao Wenyan Yang Shuai Wang Lili Xing Xinyu Xue College of Sciences Northeastern University College of Life and Health Sciences Northeastern University

Implantable bioelectronics for analyzing physiological biomarkers has recently been recognized as a promising technique in medical treatment or diagnostics. In this study, we developed a self-powered implantable skinlike glucometer for real-time detection of blood glucose level in vivo. Based on the piezo-enzymatic-reaction coupling effect of GOx@ZnO nanowire, the device under an applied deformation can actively output piezoelectric signal containing the glucose-detecting information. No external electricity power source or battery is needed for this device, and the outputting piezoelectric voltage acts as both the biosensing signal and electricity power. A practical application of the skin-like glucometer implanted in mouse body for detecting blood glucose level has been simply demonstrated. These results provide a new technique path for diabetes prophylaxis and treatment.

关键词： Diabetes Biosensor Electronic-skin Self-powered Glucose detection Implantable electronics

A novel rat tail disc degeneration model induced by static bending and compression

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Animal Models and Experimental Medicine 2021年第3期4卷 261-267页

作者： Yichao Ji Pengfei Zhu linlin zhang Huilin Yang Department of Orthopaedic Surgery The First Affiliated Hospital of Soochow UniversitySuzhouP.R.China

Background:A new rat tail intervertebral disc degeneration model was established to observe the morphologic and biologic changes of static bending and compression applied to the ***:In total,20 Sprague-Dawley rats with similar weight were randomly di-vided into 4 *** 1 served as a control group for a baseline assessment of normal *** 2 underwent a sham surgery,using an external device to bend the vertebrae of coccygeal *** 3 and 4 were the loaded groups,and exter-nal devices were instrumented to bend the spine with a compression level of 1.8 N and 4.5 N,*** resonance imaging(MRI),histological,and quanti-tative real-time PCR(qRT-PCR)analysis were performed on all animals on day 14 of the ***:Magnetic resonance imaging and histological results showed that the changes of intervertebral disc degeneration increased with the size of compression *** architecture disorganizations in nucleus pulposus and annulus fibro-sus were found on both of the convex and concave side in the groups of 1.8 N and 4.5 *** upregulation of MM-3,MM-13,and collagen 1-α1 mRNA expression and a downregulation of collagen 2-α1 and aggrecan mRNA expression were observed in the sham and loading *** changes were found between the loading groups,whereas the sham group showed similar results to the control ***:Static bending and compression could induce progressive disc degen-eration,which could be used for biologic study on disc degeneration promoted by static complex loading.

关键词： animal model annulus fibrosus bending and compression disc degeneration nucleus pulposus

The near-inertial waves observed east of the Philippines

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Journal of Oceanology and Limnology 2022年第5期40卷 1889-1908页

作者： Shengming YUAN Xiaomei YAN linlin zhang Bing YANG Chongguang PANG Dunxin HU Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China College of Earth Science University of Chinese Academy of SciencesBeijing 100049China

Based on mooring observations from Aug.1,2016 to Dec.14,2017,the characteristics and underlying mechanisms of near-inertial waves(NIWs)observed east of the Philippines were *** strong NIW events were investigated in *** NIWs in EventⅠwere induced by typhoon Lan and had the strongest magnitudes of 0.35 m/*** maximum near-inertial kinetic energy(NIKE)was shown at the ocean *** NIW in EventⅡwas stimulated by a moderate cyclonic wind with the extreme NIKE located at about 110-m *** existence of a cyclonic eddy during EventsⅠandⅡled to a blue shift of near-inertial *** EventⅢ,the surface near-inertial signals were also induced by local weak wind,whereas the real generation mechanisms for the subsurface NIWs remain *** particular,during EventⅢ,there was a nonlinear wave-wave interaction between NIWs and semidiurnal(D)tides,which further induced strong D±f ***,the NIWs in the three events exhibited distinct vertical *** NIWs in EventsⅠandⅡwere dominated by lower mode s with elevated NIKE well confined to the upper 250 m and 270 m,*** contrast,the NIW EventⅢwas dominated by higher modes and the NIWs penetrated downward beyond 360 *** deep penetration of NIWs could be attributed to the weak wind stress curl and positive sea level anomalies associated with an anticyclonic *** addition,the three NIW events had e-folding timescales of less than 7 days.

关键词： near-inertial wave(NIW) generation mechanism dynamic characteristic

Clinical and translational values of spatial transcriptomics

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Signal Transduction and Targeted Therapy 2022年第5期7卷 1396-1412页

作者： linlin zhang Dongsheng Chen Dongli Song Xiaoxia Liu Yanan zhang Xun Xu Xiangdong Wang Zhongshan Hospital Department of Pulmonary and Critical Care MedicineInstitute for Clinical ScienceShanghai Institute of Clinical BioinformaticsShanghai Engineering Research for AI Technology for Cardiopulmonary DiseasesShanghai 200000China Suzhou Institute of Systems Medicine Suzhou 215123 JiangsuChina Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua UniversityShenzhen 518055China BGI-Shenzhen Shenzhen 518083China

The combination of spatial transcriptomics(ST)and single cell RNA sequencing(scRNA-seq)acts as a pivotal component to bridge the pathological phenomes of human tissues with molecular alterations,defining in situ intercellular molecular communications and knowledge on spatiotemporal molecular *** present article overviews the development of ST and aims to evaluate clinical and translational values for understanding molecular pathogenesis and uncovering disease-specific biomarkers.

关键词： alterations translational Clinical

Automatic Detection of Weld Defects in Pressure Vessel X-Ray Image Based on CNN

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Wuhan University Journal of Natural Sciences 2022年第6期27卷 489-498页

作者： XIAO Wenkai FENG Xiang NAN Shuiyu zhang linlin Department of Computer Science and Engineering.East China University of Science and Technology Shanghai 200237China Shanghai Engineering Research Center of Smart Energy Shanghai 201103China Shanghai Aino Industrial Technology CO..LTD.Shanghai 201612 China

The visual automatic detection method based on artificial intelligence has attracted more and more attention. In order to improve the performance of weld nondestructive defect detection,we propose DRepDet(Dilated RepPoints Detector). First, we analyze the weld defect dataset in detail and summarize the distribution characteristics of weld defect data, that is, the defect scale is very different and the aspect ratio distribution range is large. Second, according to the distribution characteristics of defect data, we design DResBlock module, and introduce dilated convolution with different dilated rates in the process of feature extraction to expand the receptive field and improve the detection performance of large-scale defects. Based on DResBlock and anchor-free detection framework RepPoints, we design DRepDet. Extensive experiments show that our proposed detector can detect 7 types of defects. When using combined dilated rate convolution network in detection, the AP50 and Recall50 of big defects are improved by 3.1% and 3.3% respectively, while the performance of small defects is not affected, almost the same or slightly improved. The final performance of the whole network is improved a large margin,with 6% AP50 and 4.2% Recall50 compared with Cascade RCNN and 1.4% AP50 and 2.9% Recall50 compared with RepPoints.

关键词： nondestructive testing depth learning weld defect detection convolutional neural networks dilated convolution

Field-assisted conductive substrate sparks the redox kinetics of Co_(9)S_(8) in Li-and Na-ion batteries

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Journal of Energy Chemistry 2023年第12期87卷 114-122,I0005页

作者： Huanhuan Li Yuxin Chen Huiqin Chen Yantao Wang Jinlong Li Yanping Zheng linlin zhang Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007HenanChina Henan Key Laboratory of Advanced Nylon Materials and Application School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina Tonghua Normal University Tonghua 134002JilinChina

As a promising candidate electrode material in both Li-and Na-ion batteries(L/SIBs),the application of Co_(9)S_(8) is being hindered by its unsatisfactory electrochemical performance caused by the sluggish ion diffusion kinetics and drastic volume ***,a hybrid material composed of Co_(9)S_(8-x),N-doped carbon foam that seeded with Co nanoparticles(Co_(9)S_(8-x)@Co-NC) is ***,theoretical and experimental results imply that a built-in electric field at the interface of Co and NC is observed due to the variation of Fermi levels,forming rich Mott-Schottky-like heterointerfaces,which can significantly enhance the charge transfer capability between the active materials of Co_(9)S_(8) and conductive NC ***,the sulfur defects in Co_(9)S_(8-x)can not only effectively lower the energy barrier of the ion diffusion and charge transfer processes,but also endow the target sample with more storage/adsorption/active sites for Li^(+)/Na^(+) ions,thus improving the rate performance of the Co_(9)S_(8-x)@Co-NC *** a result,the Co_(9)S_(8-x)@Co-NC exhibits fast surface-controlled redox kinetics and robust cycling *** instance,the Co_(9)S_(8-x)@Co-NC displays impressive Li-storage properties in both half and full cells with a high reversible capacity of 1007.4 mA h g^(-1)at 0.1 A g^(-1)after 100 cycles and superior rate capability up to 5 A g^(-1).Moreover,based on these comprehensive merits,the Co_(9)S_(8-x)@Co-NC composite shows decent electrochemical performance(472.2 and 311.1 mA h g^(-1)at 0.1 and 10 A g^(-1),respectively) as an anode for *** work presents an effective strategy for the construction of Mott-Schottky-like heterointerfaces in Co_(9)S_(8) based materials and provides specific inspiration for future works designing high-performance electrodes via interfacial engineering.

关键词： Sulfur defects Mott-Schottky-like heterointerfaces Sodium lon Battery Anode Full cell