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Revisiting the anodic stability of nickel-cobalt hydroxide/carbon composite electrodes for rechargeable Ni-Zn battery

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Chinese Chemical Letters 2022年第5期33卷 2648-2652页

作者： Qihang Liu Xiaoli Zhao Xiaowei Yang School of Materials Science and Engineering Interdisciplinary Materials Research CenterTongji UniversityShanghai 201804China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China

Aqueous rechargeable Ni−Zn batteries are considered as a new generation of safe and reliable electro-chemical energy storage system.However,low electronic conductivity of Ni-based cathodes hinders the practical application of Ni-Zn batteries.This problem can be overcome by compositing the Ni-based cath-ode with highly conductive carbon substrates.A chemical oxidation pre-treatment is popularly applied to the carbon substrates to increase their hydrophilicity and thus facilitate the growth of active materials in aqueous systems.However,the anodic stability of the oxidized carbon substrates is greatly challenged,which has never been addressed in previous reports.In this work,we first compared the anodic stabil-ity of carbon fiber paper with and without oxidation treatment and find that carbon substrate with the chemical treatment caused remarkable oxidization current in the required voltage range.To take both anodic stability and fine growth of active materials into account,here we demonstrated a facile physical surface-treatment method of ethanol wetting to replace the chemical treatment.The ethanol infiltration removes gas adsorption on carbon substrates and thus promotes their hydrophilicity.This cost-effective strategy simultaneously achieves a high anodic stability and a fine growth and uniform distribution of nickel-cobalt hydroxide on the carbon microfibers.The resulting Ni-Zn battery provides a high discharge capacity of 219 mAh/g with an operation cell voltage of 1.75 V.

关键词： Rechargeable Ni-Zn battery Nickel-cobalt hydroxide Carbon substrates Anodic stability Affinity

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2D Materials Boost Advanced Zn Anodes:Principles,Advances,and Challenges

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Nano-Micro Letters 2023年第4期15卷 1-22页

作者： Songhe Zheng Wanyu Zhao Jianping Chen Xiaoli Zhao Zhenghui Pan Xiaowei Yang School of Materials Science and Engineering Tongji UniversityShanghai 201804People’s Republic of China School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Aqueous zinc-ion battery(ZIB)featuring with high safety,low cost,environmentally friendly,and high energy density is one of the most promising systems for large-scale energy storage application.Despite extensive research progress made in developing high-performance cathodes,the Zn anode issues,such as Zn dendrites,corrosion,and hydrogen evolution,have been observed to shorten ZIB’s lifespan seriously,thus restricting their practical application.Engineering advanced Zn anodes based on two-dimensional(2D)materials are widely investigated to address these issues.With atomic thickness,2D materials possess ultrahigh specific surface area,much exposed active sites,superior mechanical strength and flexibility,and unique electrical properties,which confirm to be a promising alternative anode material for ZIBs.This review aims to boost rational design strategies of 2D materials for practical application of ZIB by combining the fundamental principle and research progress.Firstly,the fundamental principles of 2D materials against the drawbacks of Zn anode are introduced.Then,the designed strategies of several typical 2D materials for stable Zn anodes are comprehensively summarized.Finally,perspectives on the future development of advanced Zn anodes by taking advantage of these unique properties of 2D materials are proposed.

关键词： Zinc-ion battery Large-scale energy storage application Zn anode Lifespan 2D materials

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Law of iterated logarithm and model selection consistency for generalized linear models with independent and dependent responses

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Frontiers of Mathematics in China 2021年第3期16卷 825-856页

作者： Xiaowei Yang Shuang SONG Huiming ZHANG School of Mathematics and Statistics Chaohu UniversityChaohuHefei238024China Center for Statistical Science Tsinghua UniversityBeijing100084China Department of Industrial Engineering Tsinghua UniversityBeijing100084China Department of Mathematics University of MacaoTaipa MacaoChina UMacao Zhuhai Research Institute Zhuhai519000China

We study the law of the iterated logarithm (LIL) for the maximum likelihood estimation of the parameters (as a convex optimization problem) in the generalized linear models with independent or weakly dependent (ρ-mixing) responses under mild conditions. The LIL is useful to derive the asymptotic bounds for the discrepancy between the empirical process of the log-likelihood function and the true log-likelihood. The strong consistency of some penalized likelihood-based model selection criteria can be shown as an application of the LIL. Under some regularity conditions, the model selection criterion will be helpful to select the simplest correct model almost surely when the penalty term increases with the model dimension, and the penalty term has an order higher than O(log log n) but lower than O(n). Simulation studies are implemented to verify the selection consistency of Bayesian information criterion.

关键词： Generalized linear models(GLMs) weighted scores method non-natural link function model selection consistency weakly dependent

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Bilayer borophene:an efficient catalyst for hydrogen evolution reaction

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Frontiers of Chemical Science and Engineering 2024年第3期18卷 13-23页

作者： Na Xing Nan Gao Panbin Ye Xiaowei Yang Haifeng Wang Jijun Zhao College of Sciences/Xinjiang Production&Construction Corps Key Laboratory of Advanced Energy Storage Materials and Technologies Shihezi UniversityShihezi832000China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)Dalian University of TechnologyDalian116024China School of Materials Science and Engineering Taizhou UniversityTaizhou318000China

The electrocatalytic hydrogen evolution reaction is a crucial technique for green hydrogen production.However,finding affordable,stable,and efficient catalyst materials to replace noble metal catalysts remains a significant challenge.Recent experimental breakthroughs in the synthesis of two-dimensional bilayer borophene provide a theoretical framework for exploring their physical and chemical properties.In this study,we systematically considered nine types of bilayer borophenes as potential electrocatalysts for the hydrogen evolution reaction.Our first-principles calculations revealed that bilayer borophenes exhibit high stability and excellent conductivity,possessing a relatively large specific surface area with abundant active sites.Both surface boron atoms and the bridge sites between two boron atoms can serve as active sites,displaying high activity for the hydrogen evolution reaction.Notably,the Gibbs free energy change associated with adsorption for these bilayer borophenes can reach as low as−0.002 eV,and the Tafel reaction energy barriers are lower(0.70 eV)than those on Pt.Moreover,the hydrogen evolution reaction activity of these two-dimensional bilayer borophenes can be described by engineering their work function.Additionally,we considered the effect of pH on hydrogen evolution reaction activity,with significant activity observed in an acidic environment.These theoretical results reveal the excellent catalytic performance of two-dimensional bilayer borophenes and provide crucial guidance for the experimental exploration of multilayer boron for various energy applications.

关键词： bilayer borophene hydrogen evolution reaction work function pH effect

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Polymeric microneedle-mediated sustained release systems: Design strategies and promising applications for drug delivery

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Asian Journal of Pharmaceutical Sciences 2022年第1期17卷 70-86页

作者： Li yang Yao yang Hongzhong Chen Lin Mei xiaowei Zeng Institute of Pharmaceutics School of Pharmaceutical Sciences(Shenzhen)Sun Yat-sen UniversityShenzhen 518107China Tianjin Key Laboratory of Biomedical Materials Key Laboratory of Biomaterials and Nanotechnology for Cancer ImmunotherapyInstitute of Biomedical EngineeringChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300192China

Parenteral sustained release drug formulations, acting as preferable platforms for longterm exposure therapy, have been wildly used in clinical practice. However, most of these delivery systems must be given by hypodermic injection. Therefore, issues including needle-phobic, needle-stick injuries and inappropriate reuse of needles would hamper the further applications of these delivery platforms. Microneedles (MNs) as a potential alternative system for hypodermic needles can benefit from minimally invasive and self-administration. Recently, polymeric microneedle-mediated sustained release systems (MN@SRS) have opened up a new way for treatment of many diseases. Here, we reviewed the recent researches in MN@SRS for transdermal delivery, and summed up its typical design strategies and applications in various diseases therapy, particularly focusing on the applications in contraception, infection, cancer, diabetes, and subcutaneous disease. An overview of the present clinical translation difficulties and future outlook of MN@SRS was also provided.

关键词： Transdermal drug delivery Microneedles Sustained release Long-term exposure therapy

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Engineering graphene for high-performance supercapacitors: Enabling role of colloidal chemistry

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Journal of Energy Chemistry 2018年第1期27卷 1-5页

作者： Ke Zhang Xiaowei Yang Dan Li Department of Materials Science and Engineering Monash University School of Materials Science and Engineering Tongji University Department of Chemical Engineering The University of Melbourne

The high electrical conductivity and high specific surface area of graphene are traditionally regarded as the most intriguing features for its promise as the electrode material for supercapacitors. In this perspective, we highlight that from the engineering point of view, the unique colloidal chemistry of chemically functionalized graphene is the key property that has made graphene stand out as a promising nanoscale building block for constructing unique nanoporous electrodes for capacitive energy storage, We present several examples to demonstrate bow the non-covalent colloidal forces between graphene sheets can be harnessed to engineer the nanostructure of graphene-based bulk electrodes for supercapacitors based on both the electrical double layer storage and the redox reaction or pseudo-capacitance mechanisms. The colloidal engineering strategy can be extended to enable other nanomaterials to achieve high energy storage performance.

关键词： Graphene Colloidal chemistry Supercapacitors Nanoporous structure Two-dimensional materials

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Optimizing the cleanliness in multi-segment disk amplifiers based on vector flow schemes

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High Power Laser Science and Engineering 2018年第1期6卷 1-6页

作者： Zhiyuan Ren Jianqiang Zhu Zhigang Liu Xiaowei Yang Key Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800 China

The objective of maintaining the cleanliness of the multi-segment disk amplifier in Shenguang-II(SG-II) is to reduce laser-induced damage for optics. The flow field of clean gas, which is used for the transportation of contaminant particles,is a key factor affecting the cleanliness level in the multi-segment disk amplifier. We developed a gas–solid coupling and three-dimensional flow numerical simulation model. The three-dimensional and two-phase flow model is verified by the flow-field smog experiment and the particle concentration measurement experiment with the 130-disk amplifier in SG-II. By optimizing the boundary conditions with the same flow rate, the multi-inlet vector flow scheme can not only effectively reduce the purging time, but also prevent the reverse diffusion of contaminant particles in the multi-segment disk amplifier and the deposition of contaminant particles on the surface of the Nd:glass.

关键词： cleanliness computational fluid dynamics flow field multi-segment disk amplifier vector flow

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Predicting the Mechanical Behavior of a Bioinspired Nanocomposite through Machine Learning

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1299-1313页

作者： Xingzi yang Wei Gao Xiaodu Wang xiaowei Zeng Department of Mechanical Engineering University of Texas at San AntonioSan AntonioTX78249USA Department of Mechanical Engineering Texas A&M UniversityCollege StationTX77843USA

The bioinspired nacre or bone structure represents a remarkable example of tough,strong,lightweight,and multifunctional structures in biological materials that can be an inspiration to design bioinspired high-performance materials.The bioinspired structure consists of hard grains and soft material interfaces.While the material interface has a very low volume percentage,its property has the ability to determine the bulk material response.Machine learning technology nowadays is widely used in material science.A machine learning model was utilized to predict the material response based on the material interface properties in a bioinspired nanocomposite.This model was trained on a comprehensive dataset of material response and interface properties,allowing it to make accurate predictions.The results of this study demonstrate the efficiency and high accuracy of the machine learning model.The successful application of machine learning into the material property prediction process has the potential to greatly enhance both the efficiency and accuracy of the material design process.

关键词： Bioinspired nanocomposite computational model machine learning finite element material interface

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Precision motion control for electro-hydraulic axis systems under unknown time-variant parameters and disturbances

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Chinese Journal of Aeronautics 2024年第1期37卷 463-471页

作者： Xiaowei Yang Yaowen GE Wenxiang DENG Jianyong YAO School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

This article focuses on asymptotic precision motion control for electro-hydraulic axis systems under unknown time-variant parameters,mismatched and matched disturbances.Different from the traditional adaptive results that are applied to dispose of unknown constant parameters only,the unique feature is that an adaptive-gain nonlinear term is introduced into the control design to handle unknown time-variant parameters.Concurrently both mismatched and matched disturbances existing in electro-hydraulic axis systems can also be addressed in this way.With skillful integration of the backstepping technique and the adaptive control,a synthesized controller framework is successfully developed for electro-hydraulic axis systems,in which the coupled interaction between parameter estimation and disturbance estimation is avoided.Accordingly,this designed controller has the capacity of low-computation costs and simpler parameter tuning when compared to the other ones that integrate the adaptive control and observer/estimator-based technique to dividually handle parameter uncertainties and disturbances.Also,a nonlinear filter is designed to eliminate the“explosion of complexity”issue existing in the classical back-stepping technique.The stability analysis uncovers that all the closed-loop signals are bounded and the asymptotic tracking performance is also assured.Finally,contrastive experiment results validate the superiority of the developed method as well.

关键词： Adaptive control Asymptotic convergence Electro-hydraulic axis system Precision motion control Unknown time-variant parameters and disturbances

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Integration of PV and Battery Storage for Catenary Voltage Regulation and Stray Current Mitigation in MVDC Railways

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 585-594页

作者： Salman Aatif Xiaowei Yang Hai Hu Santa Kumar Maharjan Zhengyou He the School of Electrical Engineering Southwest Jiaotong UniversityChengduChina the Department of Electrical Engineering(Bannu Campus) University of Engineering&Technology(UET)PeshawarPakistan

Innovative advancement in power electronics is reshaping the conventional high-voltage transmission systems and has also opened a new paradigm for researchers to consider its benefits in the railway electrification system(RES).In this regard,the medium-voltage direct current RES(MVDC-RES)is a key area of interest nowadays.In this paper,a secondary energy source(SES)consisting of renewable energies(REs)and energy storage systems(ESSs)is proposed to solve the issues of catenary voltage regulation,rail potential,and stray current in the MVDC-RES.Some of the major integration topologies of the SES are analyzed for MVDC-RES and the most effective one is proposed and implemented.The voltage at the point of connection(PoC)of the SES is used as a reference for controlling different operation modes of REs and ESSs.Moreover,feedforward control is used at the ESS converter to attain the quick response from the batteries for the desired operation.The proposed scheme improves the catenary voltage,and reduces the rail potential and stray current.Besides,the scheme provides higher energy density and reduces line losses.Simulation results are provided to validate the operation modes and advantages of the proposed scheme.

关键词： Medium-voltage direct current(MVDC)railway railway electrification system(RES) catenary voltage regulation stray current photovoltaic(PV) energy storage

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