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Laser assisted phase transformation of carbon-based transition metal oxide electrode for high-performance supercapacitor application

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Science China Chemistry 2025年

作者： Mingzhen Xiu Jianghong Zhang Yu Lu Xun Cao Kang Huang Siyu Zhu Bowei Zhang Yu Liang Chunwang Zhao junsheng wu Yizhong Huang School of Materials Science and Engineering Nanyang Technological University Energy Research Institute Interdisciplinary Graduate Programme Nanyang Technological University Institute of Sustainability for Chemicals Energy and Environment Agency for Science Technology and ResearchSingapore Institute of Advanced Materials and Technology University of Science and Technology Beijing School of Materials Science and Technology Shenyang University of Chemical Technology School of Materials Science and Hydrogen Energy Foshan University

Transitional metal oxides have a wide range of applications due to their superior *** enhanced performance of metal oxide relies on their desirable oxidation states,which is challenging to achieve and requires complex *** study demonstrates a facile strategy enabling rapid phase transformation of transition metal *** approach involves synthesis of a tetragonal Mn3O4/carbon cloth composite using the liquid plasma discharge deposition （LPDD） technique,followed by laser irradiation with the presence of ethylene glycol under an N2gas *** resulting face-centered cubic MnO/carbon cloth electrode exhibits an excellent capacitance of 1,125 F g-1at 2 A g-1,with remarkable capacitance retention of 95%after10,000 *** approach can be extended to other transition metals including Co,Cu,Cr,Fe,Ni,and *** simulations reveal the significance of ethylene glycol and the underlying mechanism associated with the phase transformation of transition metal *** present study offers a powerful technique for the phase transformation of transition metal oxide which can guide the development of new electrode materials with enhanced electrochemical properties for high-performance energy storage applications.

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Formation of macroporous gel morphology by phase separation in the silica sol-gel system containing nonionic surfactant

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Journal of University of Science and Technology Beijing 2005年第6期12卷 564-571页

作者： junsheng wu Xiaogang Li Wei Du Hua Chen Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

The phase separation and gel formation behavior in an alkoxy-derived silica sol-gel system containing C16EO15 has been investigated. Various gel morphologies similar to other sol-gel systems containing organic additives were obtained by changing the preparation conditions. Micrometer-range interconnected porous gels were obtained by freezing transitional structures of phase separation in the sol-gel process. The dependence of the resulting gel morphology on several important reaction parameters such as the starting composition, reaction temperature and acid catalyst concentration was studied in detail. The experimental results indicate that the gel morphology is mainly determined by the time relation between the onset of phase separation and gel formation.

关键词： silica sol-gel phase separation macroporous gel morphology nonionic surfactant

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A Prediction-Based Multi-Objective VM Consolidation Approach for Cloud Data Centers

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Computers, Materials & Continua 2024年第7期80卷 1601-1631页

作者： Xialin Liu junsheng wu Lijun Chen Jiyuan Hu School of Computer Science Northwestern Polytechnical UniversityXi’an710005China School of Computer Science and Technology Xi’an University of Posts and TelecommunicationsXi’an710021China Shaanxi Key Laboratory of Network Data Analysis and Intelligent Processing Xi’an University of Posts and TelecommunicationsXi’an710021China School of Software and Microelectronics Northwestern Polytechnical UniversityXi’an710005China School of Automation Xi’an University of Posts and TelecommunicationsXi’an710021China

Virtual machine(VM)consolidation aims to run VMs on the least number of physical machines(PMs).The optimal consolidation significantly reduces energy consumption(EC),quality of service(QoS)in applications,and resource *** paper proposes a prediction-basedmulti-objective VMconsolidation approach to search for the best mapping between VMs and PMs with good timeliness and practical *** use a hybrid model based on Auto-Regressive Integrated Moving Average(ARIMA)and Support Vector Regression(SVR)(HPAS)as a prediction model and consolidate VMs to PMs based on prediction results by HPAS,aiming at minimizing the total EC,performance degradation(PD),migration cost(MC)and resource wastage(RW)*** results usingMicrosoft Azure trace show the proposed approach has better prediction accuracy and overcomes the multi-objective consolidation approach without prediction(i.e.,Non-dominated sorting genetic algorithm 2,Nsga2)and the renowned Overload Host Detection(OHD)approaches without prediction,such as Linear Regression(LR),Median Absolute Deviation(MAD)and Inter-Quartile Range(IQR).

关键词： VM consolidation prediction multi-objective optimization machine learning

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Galvanic Corrosion of Magnesium Alloy and Aluminum Alloy by Kelvin Probe

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Journal of wuhan University of Technology(Materials Science) 2016年第1期31卷 204-210页

作者：肖葵 DONG Chaofang WEI Dan wu junsheng LI Xiaogang Corrosion and Protetion Center University of Science and Technology Beijing Beijing 100083 China Society Service Center China Association for Science and Technology Beijing 100081 China Ningbo Institute of Material Technology & Engineering Chinese Academy of Sciences Ningbo 315201 China

Galvanic corrosion on samples of AZ91D magnesium alloy coupled with 2A12 aluminum alloy during neutral salt spray test was *** variations of the surface potential were measured using scanning kelvin probe（SKP）.The results showed that galvanic effect on the corrosion of AZ91D magnesium alloy is closely related to the potential difference between the anodic and cathodic *** the initial period,corrosion only occurred in a narrow area at the coupling interface because of the limited distance galvanic ***,the corrosion rate of 2A12 aluminum alloy was accelerated due to its poor stability in strong alkali environment,which was attributed to the strong alkalization caused by the corrosion of AZ91D magnesium *** the increase of the potential of 2A12 aluminum alloy as a result of the continuous covering of corrosion products,the potential difference between the two materials was enlarged,which enhanced the galvanic corrosion.

关键词： magnesium alloy aluminum alloy galvanic corrosion scanning kelvin probe salt spray test

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Corrosion engineering on AlCoCrFeNi high-entropy alloys toward highly efficient electrocatalysts for the oxygen evolution of alkaline seawater

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International Journal of Minerals,Metallurgy and Materials 2023年第10期30卷 1922-1932页

作者： Zhibin Chen Kang Huang Bowei Zhang Jiuyang Xia junsheng wu Zequn Zhang Yizhong Huang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

Seawater splitting is a prospective approach to yield renewable and sustainable hydrogen *** preparation processes and poor repeatability are currently considered to be an insuperable impediment to the promotion of the large-scale production and application of *** the use of intricate instruments,corrosion engineering is an intriguing strategy to reduce the cost and presents considerable potential for electrodes with catalytic *** anode comprising quinary AlCoCrFeNi layered double hydroxides uniformly decorated on an AlCoCrFeNi high-entropy alloy is proposed in this paper via a one-step corrosion engineering method,which directly serves as a remarkably active catalyst for boosting the oxygen evolution reaction(OER)in alkaline ***,the best-performing catalyst exhibited oxygen evolution reaction activity with overpotential values of 272.3 and 332 mV to achieve the current densities of 10 and100 mA·cm^(-2),*** failure mechanism of the obtained catalyst was identified for advancing the development of multicomponent catalysts.

关键词： corrosion engineering oxygen evolution reaction catalysts layered double hydroxides seawater splitting failure mechanism

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Electrochemical behaviors of hierarchical copper nano- dendrites in alkaline media

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Nano Research 2018年第8期11卷 4225-4231页

作者： Bowei Zhang Guang Yang Chaojiang Li Kang Huang junsheng wu Shiji Hao Yizhong Huang School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore Interdisciplinary Graduate School Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive I Singapore 117575Singapore Institute of Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China

In this study, hierarchical copper nano-dendrites （CuNDs） are fabricated via the electrodeposition method. The electrochemical behaviors of the as-obtained hierarchical CuNDs in 0.1 M NaOH aqueous solution are subsequently studied. The CuNDs experience a non-equilibritrm oxidation process when subjected to cyclic voltammetry （CV） measurements. The first oxidation peak O1 in CV is attributed to the formation of an epitaxial Cu20 layer over the surface of the hierarchical CuNDs. However, the second oxidation peak 02 in CV appears unusually broad across a wide potential range. In this region, the reaction process starts with the nucleation and growth of Cu（OH）2 nanoneedles, followed by the oxidation of Cu20. Upon the increase of potential Cu20 is gradually transformed to CuO and Cu（OH）2, forming a dual-layer structure with high productivity of Cu（OH）2 nanoneedles.

关键词： copper nano-dendrites(CuNDs) non-equilibrium oxidation Cu(OH)2 nanoneedles alkaline aqueous solution

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Incorporation of nano/micron-SiC particles in Ni-based composite coatings towards enhanced mechanical and anti-corrosion properties

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 153-160页

作者： Bowei Zhang Qiao Zhang Zhan Zhang Kui Xiao Qiong Yao Guojia Ma Gang Sun junsheng wu Institute for advanced materials and technology University of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Key Laboratory of Space Lauching Site Reliability Technology Haikou 571000China Department of Materials Application Research China Aviation Manufacturing Technology InstituteBeijing 100024China

Ni-based composite coatings incorporated with nano/micron SiC particles were fabricated via electrochemical co-deposition in Watts bath,followed by the evaluation of their mechanical and anti-corrosion *** micrographic observations suggest that the SiC particles with various sizes can be well incorporated to the Ni substrate.X-ray diffraction(XRD)patterns indicate that SiC particles with smaller sizes could weaken the preferential growth of Ni along(200)*** addition,it is found that the incorporated SiC particles with medium micron sizes(8 and 1.5μm)could significantly enhance the micro-hardness of the Ni composite ***,electrochemical measurements demonstrate that micron-sized SiC particles would weaken the corrosion resistance of Ni composite coatings ascribed to the structure defects *** contrast,the combined incorporation of nanosized(50 nm)SiC particles with medium micron(1.5μm)ones is capable of promoting the compactness of the composite coatings,which is beneficial to the long-term corrosion resistance with negligible micro-hardness loss.

关键词： Watts bath Ni coating SiC particles corrosion resistance electrodeposition

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Flexible Au micro-array electrode with atomic-scale Au thin film for enhanced ethanol oxidation reaction

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Nano Research 2021年第1期14卷 311-319页

作者： Xun Cao Dongdong Peng Cao wu Yongmin He Chaojiang Li Bowei Zhang Changcun Han junsheng wu Zheng Liu Yizhong Huang College of Sciencey Hubei University of Technology 28 Nanli RoadHongshan DistrictWuhan 430068China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore International Laboratory for Insulation and Energy Efficiency Materials College of Materials Science and TechnologyNanjing University of Aeronautics and Astronautics29 Jiangjun AvenueJiangning DistrictNanjing 211100China School of Mechanical Engineering Beijing Institute of Technology5 South Zhongguancun StreetHaidian DistrictBeijing 100081China Institute for Advanced Materials and Technology University of Science and Technology Beijing30 Xueyuan RoadHaidian DistrictBeijing 100083China

The catalysis of Au thin film could be improved by fabrication of array structures in large *** this work,nanoimprint lithography has been developed tofabricate flexible Au micro-array(MA)electrodes with~100%*** electron microscopy characterisations have directly visualised the atomic-scale three-dimensional(3D)nanostructures with a maximum depth of 6 atomic ***-situ observation unveils the crystal growth in the form of *** double layer capacitance brings about large number of active sites on the Au thin film and has a logarithmic relationship with mesh *** testing shows that the Au MAs perform much better ethanol oxidation reaction than the planar sample;MAs with higher mesh grade have a greater active site utilisation ratio(ASUR),which is important to build electrochemical double layer for efficient charge *** improvement on ASUR is expected for greater electrocatalytic performance and potential application in direct ethanol fuel cell.

关键词： atomic-scale three-dimensional(3D)nanostructures atomic-scale active sites in-situ observations flexible electrode ethanol oxidation reaction active site utilisation ratio

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Cobalt tungsten phosphide with tunable W-doping as highly efficient electrocatalysts for hydrogen evolution reaction

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Nano Research 2021年第11期14卷 4073-4078页

作者： Bowei Zhang Chaojiang Li Jun Hu Dongdong Peng Kang Huang junsheng wu Zhong Chen Yizhong Huang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore639798Singapore School of mechanical engineering Beijing Institute of TechnologyZhongguancun AvenueHaidian districtBeijing100081China School of Chemical Engineering Northwest UniversityXi’an710069China

It has been of interest in seeking electrocatalysts that could exercise equally high-efficient and durable hydrogen evolution upon nonselective electrolytes in both acidic and alkaline environments. Herein, we report a facile strategy to fabricate cobalt tungsten phosphides (CoxW2−xP2/C) hollow polyhedrons with tunable composition based on metal-organic frameworks (MOFs) template method. By the deliberate control of W doping, the synthesized catalyst with the composition of Co0.9W1.1P2/C is found to be able to achieve a current density of 10 mA·cm^(−2) at overpotentials of 35 and 54 mV in acidic and alkaline media, respectively. This combined electrochemical property stands atop the state-of-the-art electrocatalyst counterparts. To unveil the peculiar behavior of the structure, density functional theory (DFT) calculation was implemented and reveals that the surface W-doping facilitates the optimization of hydrogen absorption free energy (ΔGH*) as well as the thermodynamic and kinetics barriers for water dissociation, which is coupled with the hollow structure of Co-W phosphides, leading to the prominent HER catalytic performance.

关键词： cobalt tungsten phosphide W-doping tunable composition hydrogen evolution reaction acid and alkaline media

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Secondary phase precipitate-induced localized corrosion of pure aluminum anode for aluminum–air battery

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 977-987页

作者： Bowei Zhang Hezu Wang Yan Su Wenguang Yang Xuelong Hao Zequn Zhang Fengqin Wang Wei Xue junsheng wu Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Southwest Institute of Technology and Engineering Chongqing 400039China National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials Guobiao(Beijing)Testing&Certification Co.Ltd.Beijing 101407China

Understanding the influence of purities on the electrochemical performance of pure aluminum(Al)in alkaline media for Al–air batteries is ***,we comprehensively investigate secondary phase precipitate(SPP)-induced localized corrosion of pure Al in NaOH solution mainly based on quasi-in-situ and cross-section observations under scanning electron microscopy coupled with finite element *** experimental results indicate that Al–Fe SPPs appear as clusters and are coherent with the Al *** alkaline media,Al–Fe SPPs exhibit more positive potentials than the substrate,thus aggravating localized galvanic corrosion as cathodic ***,finite element simulation indicates that the irregular geometry coupled with potential difference produces the non-uniform current density distribution inside the SPP cluster,and the current density on the Al substrate gradually decreases with distance.

关键词： aluminum secondary phase precipitates cluster corrosion alkaline

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