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Chalcogen-dependent catalytic properties of RuX2 (X = S/Se/Te) nanoparticles decorated carbon nanofibers for hydrogen evolution in acidic and alkaline media

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Nano Research 2024年第4期17卷 2528-2537页

作者： chengkai he Yue Wei Jia Xu Yujie Wei Tao Wang Rongfei Liu Lvlv Ji Zhun Liu Sheng Wang School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics Shaoxing UniversityShaoxing 312000China Zhejiang Kangjiesi New Material Technology Co. LTDZhuji 311800China

Transition metal dichalcogenides(TMDs),with the general formula MX_(2)(M=Mo/W/Fe/Co/Ni,etc.;X=S/Se/Te),have attracted extensive research interests for hydrogen evolution reaction(heR).Compared with numerous studies on noble-metal-free TMDs,the chalcogen-dependent heR catalytic properties of noble-metal-based TMDs are lack of sufficient research ***,a facile electrospinning-assisted synthetic strategy is proposed to synthesize ruthenium dichalcogenides(RuX_(2),X=S/Se/Te)nanoparticles decorated carbon nanofibers(CNFs).Benefiting from the identical nanofibrous morphology and exposed crystal planes of RuX_(2)(111),the catalytic activities of RuX_(2)@CNFs samples were investigated and compared in a fair and direct *** electrochemical measurements coupled with density functional theory calculations were carried out to probe their intrinsic heR catalytic activities,resulting in the catalytic activity order of RuS_(2)@CNFs>RuSe_(2)@CNFs>RuTe_(2)@CNFs in acidic media and that of RuS_(2)@CNFs>RuTe_(2)@CNFs>RuSe_(2)@CNFs in alkaline *** superior catalytic performance of RuS_(2)@CNFs mainly stems from the relative lower heR energy barriers and thereby the higher intrinsic catalytic activity of RuS_(2)(111),leading to ultralow overpotentials of 44 and 9 mV at 10 mA·cm^(-2) in acidic and alkaline media,***_(2)(111)is endowed with the more optimized Gibbs free energy of hydrogen adsorption(ΔGH*)than RuTe_(2)(111),but RuTe_(2)(111)shows enhanced catalytic property for H_(2)O dissociation and OH-desorption than RuSe_(2)(111),therefore,resulting in the altered catalytic activity sequences for RuSe_(2) and RuTe_(2) in acidic and alkaline media.

关键词： hydrogen evolution reaction transition metal dichalcogenides carbon nanofibers electrocatalysis catalytic activity

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Bilayer Structured Nanowire-array and Nanotube-cluster TiO2 Photoanode for Efficient Dye-sensitized Solar Cells

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Chemical Research in Chinese Universities 2015年第3期31卷 412-417页

作者： YU Jun ZHANG chengkai ZHUANG Jia QIN Haiyang he Quangui LIANG Qiumei School of Materials Science and Engineering Southwest Petroleum University Chengdu 610500 P.R.China

Nanowire-array nanotube-cluster bilayer TiO2 films, consisting of nanowire-array at the bottom layer and nanotube-cluster at the top layer were prepared via a two-step hydrothermal method. One step was a growth process and the other was an etching process. Etching process was used to acquire nanowire-array with a small diameter of 20--25 nm of the nanowire and nanotube-cluster. The bilayer nanostructured films were then modified with TiCI4. Villous TiO2 attached to both the inside and outside wails of the nanotube cluster was obtained only by changing the traditional concentration of TiCla-treatment to 0.2 mol/L. The novel bilayer photoanode finally revealed a higher effi- ciency of 5.25% when used in dye-sensitized solar cells（DSSCs）.

关键词： Bilayer structure Etching Titanium oxide Photoanode Dye-sensitized solar cell

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heat shock factor 1 is a direct anti-amyloid factor:connecting neurodegeneration and uncontrolledgrowth

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Neural Regeneration Research 2022年第3期17卷 559-560页

作者： Zijian Tang chengkai Dai Mouse Cancer Genetics Program Center for Cancer ResearchNational Cancer InstituteFrederickMDUSA

Worldwide,more than 40 million people are afflicted with Alzheimer's disease(AD)(Esquerda-Canals et al.,2017).AD is a devastating neurodegenerative disroder characterized by progressive decline in cognitive abilities.A hallmark of AD and other neurodegenerative disorders in humans is the aggregation of proteins into amyloid fibrils and their deposition into plaques and intracellular inclusions(Iadanza et al.)。

关键词： amyloid al. Alzheimer

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Dual loop feedback pre-distortion in satellite communication

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Journal of Systems Engineering and Electronics 2013年第4期24卷 586-591页

作者： chengkai Tang Baowang Lian Yi Zhang School of Electronics and Information Northwestern Polytechnical University

Since the satellite communication goes in the trend of high-frequency and fast speed, the coefficients updating and the precision of the traditional pre-distortion feedback methods need to be further improved. On this basis, this paper proposes dual loop feedback pre-distortion, which uses two first-order Volterra filter models to reduce the computing complexity and a dynamic error adjustment model to construct a revised feedback to ensure a better pre-distortion performance. The computation complexity, iterative convergence speed and precision of the proposed method are theoretically analyzed. Simulation results show that this dual loop feedback pre-distortion can speed the updating of coefficients and ensure the linearity of the amplifier output.

关键词： satellite communication pre-distortion Volterra filter dual loop feedback mean square error.

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Bilayered nanosheets used for complex topography wound anti‑infection

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Bio-Design and Manufacturing 2020年第4期3卷 373-382页

作者： chengkai Xuan Xuemin Liu Chen Lai Xuetao Shi Peking University Shenzhen Institute Peking UniversityShenzhenPeople’s Republic of China School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640People’s Republic of China National Engineering Research Center for Tissue Restoration and Reconstruction South China University of TechnologyGuangzhou 510006People’s Republic of China Guangzhou Regenerative Medicine and health Guangdong Laboratory Guangzhou 510005People’s Republic of China

There is a consensus that the prevention of wound infection should be achieved in the following ways:(1)closing the wound to protect it from extra infection;(2)an antibacterial agent that could kill endogenous ***,existing bulk two-dimensional antibacterial materials show inefficient adhesion to wounds with complex morphology and thus cause the prevention of wound *** the thickness of bulk two-dimensional materials to less than 100 nanometres endows them with great flexibility,which could allow them to adhere to wounds with complex morphology by only physical ***,a broad-spectrum and efficient antimicrobial peptide(AMP)was introduced to biocompatible methacrylated gelatine(GelMA)with multiple modification sites,which served as an inner antibacterial *** being combined with a biodegradable and good mechanical poly-l-lactide(PLLA)outer layer through plasma-treatment-assisted spin coating,we finally constructed bilayered antibacterial nanosheets with a thickness of approximately 80 *** bilayered nanosheets possess good adhesion to surfaces with complex topography and thus achieve better wound closure than other bulk two-dimensional ***,this AMP-grafted conjugation shows minimal cytotoxicity compared with Ag^+antibacterial agents,and the antibacterial rate of nanosheets is dependent on the graft rate of *** suggest that this bilayered antibacterial nanosheet might be an advanced anti-infection dressing for wound treatment in clinical settings.

关键词： Nanosheet Adhesive Complicated topography Antimicrobial

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The combined effects of quantum and strong coupling on the nonlinear collective excitation in quantum dusty plasmas

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Communications in Theoretical Physics 2024年第10期76卷 135-140页

作者： chengkai Li Youyou Kang Yunliang Wang Department of Physics School of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China

The quantum hydrodynamic model for electrons and ions and the generalized hydrodynamic model for the strongly coupled dust particles are proposed in the strongly coupled quantum dusty plasma, where the combined quantum effects of quantum diffraction, quantum statistic pressure,as well as electron exchange and correlation effects are all considered in the quantum hydrodynamic model. The shear and bulk viscosity effects are included in the viscoelastic relaxation, which leads to the decay of the dust-ion-acoustic waves. The approximate time-dependent solitary solution is obtained by the momentum conservation law in the presence of viscosity.

关键词： quantum plasma strongly coupled plasma dusty plasma

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Using deep neural networks coupled with principal component analysis for ore production forecasting at open-pit mines

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 727-740页

作者： chengkai Fan Na Zhang Bei Jiang Wei Victor Liu Department of Civil and Environmental Engineering University of AlbertaEdmontonAlbertaT6G 2E3Canada Department of Mathematical and Statistical Sciences University of AlbertaEdmontonAlbertaT6G 2G1Canada

Ore production is usually affected by multiple influencing inputs at open-pit ***,the complex nonlinear relationships between these inputs and ore production remain *** becomes even more challenging when training data(*** haulage information and weather conditions)are *** machine learning(ML)algorithms,deep neural network(DNN)is a superior method for processing nonlinear and massive data by adjusting the amount of neurons and hidden *** study adopted DNN to forecast ore production using truck haulage information and weather conditions at open-pit mines as training *** the prediction models were built,principal component analysis(PCA)was employed to reduce the data dimensionality and eliminate the multicollinearity among highly correlated input *** verify the superiority of DNN,three ANNs containing only one hidden layer and six traditional ML models were established as benchmark *** DNN model with multiple hidden layers performed better than the ANN models with a single hidden *** DNN model outperformed the extensively applied benchmark models in predicting ore *** can provide engineers and researchers with an accurate method to forecast ore production,which helps make sound budgetary decisions and mine planning at open-pit mines.

关键词： Oil sands production Open-pit mining Deep learning Principal component analysis(PCA) Artificial neural network Mining engineering

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Analytical model of friction behavior during polymer scratching with conical tip

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Friction 2019年第5期7卷 466-478页

作者： chengkai JIANG Han JIANG Jianwei ZHANG Guozheng KANG Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Engineering Southwest Jiaotong University

To investigate the effects of the contact geometry, interfacial friction, and substrate recovery on the behavior of polymer scratching using a conical tip, an analytical model is proposed. The normal stress acting on the contact surface between the tip and the substrate is described as a function of the included angle θ, representing the angle between two planes across the axis of the conical tip, and the attack angle β, representing the angle between the conical surface and the substrate material surface. The effects of the rear contact geometry on the scratch friction between the tip and substrate, represented by recovery angle φ, owing to the instantaneous elastic recovery of the polymer substrate, are also introduced. Validated by the experimental and numerical results from the literature, the proposed analytical model can describe well the scratch coefficient of friction(SCOF), which is defined as the ratio of the tangential force to the normal force. Meaningful guidance is provided to understand the scratch friction behavior.

关键词： polymer scratch contact geometry elastic recovery scratch coefficient of friction

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A moving object segmentation algorithm for static camera via active contours and GMM

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Science in China(Series F) 2009年第2期52卷 322-328页

作者： WAN chengkai YUAN BaoZong MIAO ZhenJiang Institute of Information Science Beijing Jiaotong University Beijing 100044 China

Moving object segmentation is one of the most challenging issues in computer vision. In this paper, we propose a new algorithm for static camera foreground segmentation. It combines Gaussian mixture model （GMM） and active contours method, and produces much better results than conventional background subtraction methods. It formulates foreground segmentation as an energy minimization problem and minimizes the energy function using curve evolution method. Our algorithm integrates the GMM background model, shadow elimination term and curve evolution edge stopping term into energy function. It achieves more accurate segmentation than existing methods of the same type. Promising results on real images demonstrate the potential of the presented method.

关键词： moving object segmentation active contours GMM, level set

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Interfacial design of silicon/carbon anodes for rechargeable batteries:A review

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Journal of Energy Chemistry 2023年第1期76卷 576-600,I0014页

作者： Quanyan Man Yongling An chengkai Liu hengtao Shen Shenglin Xiong Jinkui Feng Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061ShandongChina School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100ShandongChina Shenzhen Institute of Shandong University Shenzhen 518057GuangdongChina

Silicon(Si)has been studied as a promising alloying type anode for lithium-ion batteries due to its high specific capacity,low operating potential and abundant ***,huge volume expansion during alloying/dealloying processes and low electronic conductivity of Si anodes restrict their electrochemical ***,carbon(C)materials with special physical and chemical properties are applied in Si anodes to effectively solve these *** review focuses on current status in the exploration of Si/C anodes,including the lithiation mechanism and solid electrolyte interface formation,various carbon sources in Si/C anodes,such as traditional carbon sources(graphite,pitch,biomass),and novel carbon sources(MXene,graphene,MOFs-derived carbon,graphdiyne,etc.),as well as interfacial bonding modes of Si and C in the Si/C ***,we summarize and prospect the selection of carbonaceous materials,structural design and interface control of Si/C anodes,and application of Si/C anodes in all-solid-state lithium-ion batteries and sodium-ion batteries et *** review will help researchers in the design of novel Si/C anodes for rechargeable batteries.

关键词： Silicon/carbon anodes Lithium-ion batteries Interfacial reaction Carbon sources Interface bonding

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