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Phosphorus incorporation activates the basal plane of tungsten disulfide for efficient hydrogen evolution catalysis

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Nano Research 2022年第4期15卷 2855-2861页

作者： Fan wang Shuwen Niu Xinqi Liang gongming wang Minghua Chen Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) Harbin University of Science and TechnologyHarbin 150080China Department of Chemistry University of Science and Technology of ChinaHefei 230026China

The basal planes of transition metal dichalcogenides are basically inert for catalysis due to the absence of adsorption and activation sites,which substantially limit their catalytic ***,a facile strategy to activate the basal plane of WS_(2) for hydrogen evolution reaction(HER)catalysis by phosphorous-induced electron density modulation is *** optimized P doped WS_(2)(P-WS_(2))nanowires arrays deliver a low overpotential of 88 mV at 10 mA·cm^(-2)with a Tafel slope of 62 mV·dec^(-1)for HER,which is substantially better than the pristine counterpart.X-ray photoelectron spectroscopy confirms the surface electron densities of WS_(2) have been availably manipulated by P ***,density functional theory(DFT)studies further prove P doping can redistribute the density of states(DOS)around EF,which endow the inert basal plane of PWS_(2) with edge-like catalytic activity toward hydrogen evolution *** work offers a facile and effective approach to modulate the catalytic surface of WS_(2) toward highly efficient HER catalysis.

关键词： tungsten disulfide electronic structure modulator orbital orientation density of states redistribution hydrogen evolution reaction

A nearest neighbor search algorithm of high-dimensional data based on sequential NPsim matrix

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High Technology Letters 2016年第3期22卷 241-247页

作者：李文法 wang gongming Ma Nan Liu Hongzhe Beijing Key Laboratory of Information Service Engineering Beijing Union University National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of Sciences

Problems existin similarity measurement and index tree construction which affect the performance of nearest neighbor search of high-dimensional data. The equidistance problem is solved using NPsim function to calculate similarity. And a sequential NPsim matrix is built to improve indexing performance. To sum up the above innovations,a nearest neighbor search algorithm of high-dimensional data based on sequential NPsim matrix is proposed in comparison with the nearest neighbor search algorithms based on KD-tree or SR-tree on Munsell spectral data set. Experimental results show that the proposed algorithm similarity is better than that of other algorithms and searching speed is more than thousands times of others. In addition,the slow construction speed of sequential NPsim matrix can be increased by using parallel computing.

关键词： nearest neighbor search high-dimensional data similarity indexing tree NPsim KD-tree SR-tree Munsell

Effect of olfactory ensheathing cell transplantation on myelin repair and motor function in a rat model of experimental allergic encephalomyelitis

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Neural Regeneration Research 2009年第4期4卷 281-285页

作者： Yifeng Du Shougang Guo Feng Jin Minzhong wang gongming wang Department of Neurology Provincial Hospital Affiliated to Shandong University Jinan 25002 1 Shandong Province China Department of Neurosurgery Affiliated Hospital of Jining Medical University Jining 272029 Shandong Province China Department of Anesthesiology Provincial Hospital Affiliated to Shandong University Jinan 250021 Shandong Province China

BACKGROUND： Olfactory ensheathing cell transplantation can activate axonal regeneration and enhance myelin repair, which are beneficial for treating demyelinating diseases. OBJECTIVE： To explore the effects of olfactory ensheathing cell transplantation on myelin repair, synaptophysin expression, and motor function in a rat model of experimental allergic encephalomyelitis. DESIGN, TIME AND SETTING： A randomized, controlled experiment was performed at the Laboratory of Provincial Hospital affiliated to Shandong University between August 2006 and September 2007. MATERIALS： Dibenzylamine （Hoechst 33342）, luxol fast blue, and rabbit anti-rat synaptophysin antibody were provided by Sigma, USA. METHODS： Olfactory ensheatbing cells extracted from neonatal Wistar rats were cultured for 10-14 days and labeled with dibenzylamine. Spinal cord extracted from a healthy guinea pig was homogenized and equally mixed with complete Freund＇s adjuvant; thereafter, the mixture was intracutaneously injected into two posterior voix pedis of healthy male Wistar rats to establish models of experimental allergic encephalomyelitis. Rats were randomly divided into a control encephalomyelitis group and an olfactory ensheathing cell transplantation group, 36 rats in each group. Physiological saline （2 μ L） or an olfactory ensheathing cell suspension （2 μ L） was separately injected along lateral cerebral ventricle at day 7 post-model induction. MAIN OUTCOME MEASURES： The migration and distribution of olfactory ensheathing cells were observed under fluorescence microscopy; myelin repair was detected using hematoxylin-eosin staining and luxol fast blue staining; synaptophysin expression was measured using immunohistochemical staining; motor function was evaluated using a motor function scale. RESULTS： Olfactory ensheatbing cells could survive in vivo and migrate to the distal end of the transplant focus and spinal cord, and survived 21 days. Hematoxylin-eosin staining and luxol fast blue staining in

关键词： olfactory ensheathing cells transplantation experimental allergic encephalomyelitis myelin synaptophysin

A multi-target stance detection based on Bi-LSTM network with position-weight

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High Technology Letters 2020年第4期26卷 442-447页

作者： Xu Yilong Li Wenfa wang gongming Huang Lingyun Smart City College Beijing Union UniversityBeijing 100101P.R.China College of Robotics Beijing Union UniversityBeijing 100101P.R.China Tianyuan Network Co. Ltd.Beijing 100193P.R.China Beijing Tianyuan Network Co. Ltd.Beijing 100193P.R.China Chinatelecom Information Development Co. Ltd.Beijing 100093P.R.China

In the task of multi-target stance detection,there are problems the mutual influence of content describing different targets,resulting in reduction in *** solve this problem,a multi-target stance detection algorithm based on a bidirectional long short-term memory(Bi-LSTM)network with position-weight is ***,the corresponding position of the target in the input text is calculated with the ultimate position-weight ***,the position information and output from the Bi-LSTM layer are fused by the position-weight fusion ***,the stances of different targets are predicted using the LSTM network and softmax *** multi-target stance detection corpus of the American election in 2016 is used to validate the proposed *** results demonstrate that the Bi-LSTM network with position-weight achieves an advantage of 1.4%in macro average F1 value in the comparison of recent algorithms.

关键词： long short-term memory(LSTM) multi-target natural language processing stance detection

Phosphorene:a Potential 2D Material for Highly Efficient Polysulfide Trapping and Conversion

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Chemical Research in Chinese Universities 2020年第4期36卷 631-639页

作者： PEI Zhibin LIU Yun SUN Da ZHU Zixuan wang gongming Key Laboratory of Engineering Dielectric and Applications Ministry of EducationHarbin University of Science and TechnologyHarbin 150080P.R.China School of Environment and Energy South China University of TechnologyGuangzhou 510640P.R.China Hefei National Laboratory for Physical Science at Microscale and Department of Chemistry University of Science&Technology of ChinaHefei 230026P.R.China

Effectively trapping lithium polysulfide species and accelerating the reaction conversion kinetics are the main strategies to improve the performance of lithium-sulfur(Li-S)*** the researchers found in 2014 that two-dimensional(2D)phosphorene nanosheets could be exfoliated from the bulk black phosphorus,numerous researches have been devoted to exploring the phosphorene with unique properties for the application in Li-S batteries In this *** summarize the recent theoretical and experimental progress of phosphorene for Li-S ***-sides,we also introduce the relationship between the interfacial interaction on phosphorene and the performance enhancement of Li-S ***,future challenges and remaining opportunities for phosphorene in Li-s batteries are finally discussed.

关键词： Phosphorene Lithium-sulfur battery Shuttle effect Catalytic conversion Enhanced redox kinetics

Quantitative defect regulation of heterostructures for sulfur catalysis toward fast and long lifespan lithium-sulfur batteries

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Nano Research 2022年第9期15卷 7925-7932页

作者： Saisai Qiu Xinqi Liang Shuwen Niu Qingguo Chen gongming wang Minghua Chen Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China Hefei National Laboratory for Physical Science at the Microscale Department of ChemistryUniversity of Science&Technology of ChinaHefei 230026China

The advancement of lithium-sulfur(Li-S)batteries is severely retarded by lithium polysulfides(LiPSs)shuttling behavior and sluggish redox ***,the heterogeneous composite with defective Bi_(2)Se_(3−x)nanosheets and porous nitrogen-doped carbon(Bi_(2)Se_(3−x)/NC)is prepared by selenizing bismuth metal-organic frameworks as a multifunctional sulfur *** highly efficient immobilization-conversion on LiPSs is realized by the synergistic effect of structure construction strategy and defect *** is found that Bi_(2)Se_(3−x)with the suitable amount of selenium vacancies achieves the best electrochemical performance due to the advantages of its structure and *** results confirm the intrinsic correlation between defects and catalysis,which are revealed by computational and experimental *** to these superiorities,the developed sulfur electrodes exhibited admirable stability and a fairly lower capacity decay rate of approximately 0.0278%per cycle over 1,000 cycles at a 3 C *** at the high sulfur loading of 6.2 mg·cm^(−2),the cathode still demonstrates a high discharge capacity of 455 mAh·g^(−1)at 1 *** work may enlighten the development of mechanism investigation and design principles regarding sulfur catalysis toward high-performance Li-S batteries.

关键词： lithium-sulfur(Li-S)batteries lithium polysulfides(LiPSs) shuttle effect redox kinetics selenium vacancy sulfur catalysis

Constructing high coordination number of Ir-O-Ru bonds in IrRuO_(x)nanomeshes for highly stable acidic oxygen evolution reaction

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Nano Research 2024年第6期17卷 5073-5079页

作者： Ge Yu Ruilong Li Yida Zhang Xingen Lin gongming wang Xun Hong Center of Advanced Nanocatalysis(CAN) Department of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026China National Synchrotron Radiation Laboratory(NSRL) University of Science and Technology of ChinaHefei 230029China

IrRu bimetallic oxides are recognized as the promising acidic oxygen evolution reaction(OER)catalysts,but breaking the trade-off between their activity and stability is an unresolved ***,addressing the issues of mass transport obstruction of IrRu bimetallic oxides under high current remains a challenge for the development of proton exchange membrane water electrolysis(PEM-WE).Herein,we prepared an IrRuO_(x)nanomeshes(IrRuO_(x)NMs)with high coordination number(CN)of Ir-O-Ru bonds in a mixed molten salt with high solubility of the Ir/Ru precursor.X-ray absorption spectroscopy analysis revealed that the IrRuO_(x)NMs possess high coordination number of Ir-O-Ru bonds(CNIr-O-Ru=5.6)with a distance of 3.18Å.Moreover,the nanomesh structures of IrRuO_(x)NMs provided hierarchical channels to accelerate the transport of oxygen and water,thus further improving the electrochemical ***,the IrRuO_(x)NMs as OER catalysts can simultaneously achieve high activity and stability with low overpotential of 196 mV to reach 10 mA·cm^(−2)and slightly increase by 70 mV over 650 h *** electrochemical mass spectrometry tests suggest that the preferred OER mechanism for IrRuO_(x)NMs is the adsorbent evolution mechanism,which is beneficial for the robust structural stability.

关键词： oxygen evolution reaction IrRuO_(x) Ir-O-Ru bonds two-dimensional(2D)nanomesh proton exchange membrane device mass transport

Manipulating photogenerated electron flow in nickel single‐atom catalysts for photocatalytic CO_(2) reduction into tunable syngas

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Carbon Energy 2024年第8期6卷 205-213页

作者： Yida Zhang Qingyu wang Lihui Wu Haibin Pan Chengyuan Liu Yue Lin gongming wang Xusheng Zheng National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiAnhuiChina College of Chemistry and Materials Science University of Science and Technology of ChinaHefeiAnhuiChina Department of Chemistry Hefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefeiAnhuiChina

The key to designing photocatalysts is to orient the migration of photogenerated electrons to the target active sites rather than dissipate at inert ***,we demonstrate that the doping of phosphorus(P)significantly enriches photogenerated electrons at Ni active sites and enhances the performance for CO_(2) reduction into *** photocatalytic CO_(2) reduction,Ni single‐atom‐anchored P‐modulated carbon nitride showed an impressive syngas yield rate of 85μmol gcat^(−1)h^(−1) and continuously adjustable CO/H_(2) ratios ranging from 5:1 to 1:2,which exceeded those of most of the reported carbon nitride‐based single‐atom *** studies reveal that P doping improves the conductivity of catalysts,which promotes photogenerated electron transfer to the Ni active sites rather than dissipate randomly at low‐activity nonmetallic sites,facilitating the CO_(2)‐to‐syngas photoreduction process.

关键词： carbon nitride CO_(2) photoreduction electron flow Ni single atoms syngas

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High Technology Letters 2017年第2期23卷 179-184页

作者：李文法 wang gongming Li Ke Huang Su Beijing Key Laboratory of Information Service Engineering Beijing Union University National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of Sciences

The performance of conventional similarity measurement methods is affected seriously by the curse of dimensionality of high-dimensional *** reason is that data difference between sparse and noisy dimensionalities occupies a large proportion of the similarity,leading to the dissimilarities between any results.A similarity measurement method of high-dimensional data based on normalized net lattice subspace is *** data range of each dimension is divided into several intervals,and the components in different dimensions are mapped onto the corresponding *** the component in the same or adjacent interval is used to calculate the *** validate this method,three data types are used,and seven common similarity measurement methods are *** experimental result indicates that the relative difference of the method is increasing with the dimensionality and is approximately two or three orders of magnitude higher than the conventional *** addition,the similarity range of this method in different dimensions is [0,1],which is fit for similarity analysis after dimensionality reduction.

关键词： high-dimensional data the curse of dimensionality similarity normalization subspace NPsim