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Nano-Au-decorated hierarchical porous cobalt sulfide derived from ZIF-67 toward optimized oxygen evolution catalysis:Important roles of microstructures and electronic modulation

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Carbon Energy 2024年第5期6卷 1-14页

作者： Hongyu Gong Guanliang Sun Wenhua Shi Dongwei Li Xiangjun Zheng Huan Shi Xiu Liang Ruizhi Yang Changzhou Yuan Department of New Energy Materials School of Environmental and Chemical EngineeringJiangsu University of Science and TechnologyZhenjiangJiangsuChina Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)JinanShandongChina Shandong Saikesaisi Hydrogen Energy Co. Ltd.JinanShandongChina Department of Materials Science and Engineering School of Materials Science&EngineeringUniversity of JinanJinanShandongChina Department of New Energy Science and Engineering College of EnergySoochow Institute for Energy and Materials InnovationsSoochow UniversitySuzhouJiangsuChina

Enhancing both the number of active sites available and the intrinsic activity of Co-based electrocatalysts simultaneously is a desirable ***,a ZIF-67-derived hierarchical porous cobalt sulfide decorated by Au nanoparticles(NPs)(denoted as HP-Au@CoxSy@ZIF-67)hybrid is synthesized by low-temperature sulfuration *** well-defined macroporous-mesoporous-microporous structure is obtained based on the combination of polystyrene spheres,as-formed CoxSy nanosheets,and ZIF-67 *** novel three-dimensional hierarchical structure significantly enlarges the three-phase interfaces,accelerating the mass transfer and exposing the active centers for oxygen evolution *** electronic structure of Co is modulated by Au through charge transfer,and a series of experiments,together with theoretical analysis,is performed to ascertain the electronic modulation of Co by ***,HP-Au@CoxSy@ZIF-67 catalysts with different amounts of Au were synthesized,wherein Au and NaBH4 reductant result in an interesting“competition effect”to regulate the relative ratio of Co^(2+)/Co^(3+),and moderate Au assists the electrochemical performance to reach the highest ***,the optimized HP-Au@CoxSy@ZIF-67 exhibits a low overpotential of 340 mV at 10 mA cm^(-2)and a Tafel slope of 42 mV dec-1 for OER in 0.1 M aqueous KOH,enabling efficient water splitting and Zn-air battery *** work here highlights the pivotal roles of both microstructural and electronic modulation in enhancing electrocatalytic activity and presents a feasible strategy for designing and optimizing advanced electrocatalysts.

关键词： Au nanoparticles cobalt sulfide electronic modulation hierarchical porous structure oxygen evolution reaction

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Oxygen-defects evolution to stimulate continuous capacity increase in Co-free Li-rich layered oxides

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Journal of Energy Chemistry 2023年第7期82卷 259-267,I0006页

作者： Yibin Zhang Xiaohui Wen Zhepu Shi Bao Qiu Guoxin Chen Zhaoping Liu Ningbo Institute of Materials Technology and Engineering(NIMTE) Chinese Academy of Sciences(CAS)Ningbo 315201ZhejiangChina School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315201ZhejiangChina Department of Chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham Ningbo Chin1Ningbo 315199ZhejiangChina

Though oxygen defects are associated with deteriorated structures and aggravated cycling performance in traditional layered cathodes,the role of oxygen defects is still ambiguous in Li-rich layered oxides due to the involvement of oxygen ***,a Co-free Li-rich layered oxide Li_(1.286)Ni_(0.071)Mn_(0.643)O_(2)has been prepared by a co-precipitation method to systematically investigate the undefined effects of the oxygen defects.A significant O_(2)release and the propagation of oxygen vacancies were detected by operando differential electrochemical mass spectroscopy(DEMS)and electron energy loss spectroscopy(EELS),*** transmission electron microscopy-high angle annular dark field(STEMHAADF)reveals the oxygen vacancies fusing to nanovoids and monitors a stepwise electrochemical activation process of the large Li_(2)MnO_(3)domain upon *** with the quantitative analysis conducted by the energy dispersive spectrometer(EDS),existed nano-scale oxygen defects actually expose more surface to the electrolyte for facilitating the electrochemical activation and subsequently increasing available ***,this work persuasively elucidates the function of oxygen defects on oxygen redox in Co-free Li-rich layered oxides.

关键词： Li-rich layered oxide Irreversible oxygen loss Nano-scale oxygen defect Li_(2)MnO_(3)-domain activation

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Tunable Phase Structure of Side-chain Liquid Crystalline Polymers Enabled by Molecular engineering of Dual Mesogenic Cores

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Chinese Journal of Polymer science 2024年第10期42卷 1459-1469,I0009页

作者： Wen-Huan Yao Lan-Sheng Liu Jie Zhao Yan-Xia Wang An-Zhi Ma Zheng-Rui Ma Lan-Ying Zhang Ruo-Chen Lan College of Chemistry and Chemical Engineering Hunan UniversityChangsha410082China Key Laboratory of Eco-Functional Polymer Materials of the Ministry of Education Key Laboratory of Eco-Environmental Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou730070China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China Institute of Advanced Materials&Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang330022China

A series of novel side-chain liquid crystalline(SCLC)copolymers were synthesized by attaching two distinct mesogenic units,namely a chiral cholesteryl-based monomer(M1)and an achiral biphenyl-based monomer(M2),to a poly(3-mercaptopropylmethylsiloxane)(PMMS)backbone via thiol-ene click *** influence of side chain composition on the self-assembly behavior and phase structures of these SCLC copolymers was systematically investigated using different *** indicate that three distinct liquid crystalline phases and four unique molecular configurations were identified within the polymer series,with the emergence of the liquid crystalline phase being a synergistic outcome of the two distinct side *** study underscores the critical influence of side chain dimensions,rigidity,and spatial volume on the self-assembly structures and phase characteristics of liquid crystalline polymers,providing valuable insights for the rational design and development of advanced functional materials with tailored properties.

关键词： Liquid crystalline copolymers Self-assembly Phase structure Chiral molar ratio

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Interfacial reactions in the Sn-9.0 wt.% Zn/Cu-Ti alloy (C1990 HP) couple

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Soldering and Surface Mount Technology 2024年第1期36卷 30-38页

作者： Laksono, Andromeda Dwi Chen, Chih-Ming Yen, Yee-Wen Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Chemical Engineering National Chung Hsing University Taichung Taiwan Study Program of Material and Metallurgical Engineering Institut Teknologi Kalimantan Balikpapan Indonesia

Purpose: The purpose of this study was to examine the influence of adding a small amount of Ti to a Cu-based alloy, specifically the commercial Hyper Titanium Copper alloy (C1990 HP), which contains Cu-3.28 wt.% Ti, on its interfacial reaction with Sn-9.0 wt.% Zn (SnZn) solder, using the liquid/solid reaction couple technique. Design/methodology/approach: The SnZn/C1990 HP couples were subjected to a reaction temperature of 240–270°C for a duration of 0.5–5 h. The resulting reaction couple was characterized using a scanning electron microscope, energy dispersive spectrometer, electron probe microanalyzer and X-ray diffractometer. Findings: It was observed that the scallop-shaped CuZn5 and planar Cu5Zn8 phases were formed in almost all SnZn/C1990 HP couples. With increased reaction duration and temperature, the Cu-rich intermetallic compound (IMC)-Cu5Zn8 phase became a dominant IMC formed at the interface. The total thickness of the IMCs was increased with the increase in the reaction duration and temperature. The IMC growth obeyed the parabolic law, and the IMC growth mechanism was diffusion controlled. The activation energy of the SnZn/C1990 HP couple was 64.71 kJ/mol. Originality/value: This article presents an analysis of the IMC thickness in each sample using ImageJ software, followed by kinetic analysis using Origin software at various reaction temperatures of SnZn/C1990 HP in liquid/solid couples. The study also includes detailed reports on the morphology, interface composition and X-ray diffraction analysis, as well as the activation energy. The findings can serve as a valuable reference for electronic packaging companies that utilize C1990 HP substrates. © 2023, Emerald Publishing Limited.

关键词： Binary alloys

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Chevrel phase: A review of its crystal structure and electrochemical properties

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Progress in Natural science:materials International 2023年第1期33卷 8-15页

作者： Meng Liu Guocheng Lv Tianming Liu Hao Liu Lingchang Kong Lintao Tian Wenxiu Rao Yuxin Li Libing Liao Juchen Guo Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences(Beijing) School of Science China University of Geosciences Materials Science and Engineering Program University of California-Riverside Department of Chemical and Environmental Engineering University of California – Riverside

Chevrel phase compounds have attracted increasing attention as electrochemical energy storage materials and electro-catalysts. Benefiting from their unique crystal structure, Chevrel phase compounds can not only function as the host structures for reversible intercalation of a broad range of cations, but also exhibit high catalytic activity in electrochemical reduction reactions. Here we provide an overview of recent progress in the development of Chevrel phase materials including new understanding of structural features, synthetic methods, and electrochemical properties. A brief conclusion and perspectives on the future development of Chevrel phase materials are also provided.

关键词： Chevrel phase Electrochemical properties Energy storage Electro-catalysis

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Electronic and thermal properties of Ag-doped single crystal zinc oxide via laser-induced technique

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Chinese Physics B 2023年第6期32卷 44-51页

作者：邢欢王惠琼宋廷鲁李纯莉戴扬傅耿明康俊勇郑金成 Engineering Research Center of Micro-nano Optoelectronic Materials and Devices Ministry of EducationFujian Key Laboratory of Semiconductor Materials and ApplicationsCI Center for OSEDand Department of PhysicsXiamen UniversityXiamen 361005China Department of Physics and Department of New Energy Science and Engineering Xiamen University MalaysiaSepang 439000Malaysia Experimental Center of Advanced Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China School of Material Science&Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Chemical Engineering School of Environmental and Chemical Engineeringand Institute for Sustainable EnergyShanghai UniversityShanghai 200444China

The doping of ZnO has attracted lots of attention because it is an important way to tune the properties of *** after growth is one of the efficient ***,we report a unique approach to successfully dope the single crystalline ZnO with Ag by the laser-induced method,which can effectively further post-treat grown *** sputtering was used to coat the Ag film with a thickness of about 50 nm on the single crystalline ***-doped yttrium aluminum garnet(Nd:YAG)laser was chosen to irradiate the Ag-capped ZnO samples,followed by annealing at700℃for two hours to form ZnO:*** three-dimensional(3D)information of the elemental distribution of Ag in ZnO was obtained through time-of-flight secondary ion mass spectrometry(TOF-SIMS).TOF-SIMS and core-level x-ray photoelectron spectroscopy(XPS)demonstrated that the Ag impurities could be effectively doped into single crystalline ZnO samples as deep as several hundred *** broadening of core level XPS profiles of Ag from the surface to depths of hundred nms was observed,indicating the variance of chemical state changes in laser-induced Ag-doped *** features of electronic mixing states were detected in the valence band XPS of ZnO:Ag,suggesting the strong coupling or interaction of Ag and ZnO in the sample rather than their simple *** Ag-doped ZnO also showed a narrower bandgap and a decrease in thermal diffusion coefficient compared to the pure ZnO,which would be beneficial to thermoelectric performance.

关键词： zinc oxide Ag-doping laser-induced technique XPS SIMS thermal diffusivity

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Photocontrolled polymer adhesives facilitate the assembly of hydrogels for soft robotics

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science China Chemistry 2024年第10期67卷 3184-3186页

作者： Diling Yang Hao Zhang Hongbo Zeng School of Materials and Environmental Engineering Hunan University of HumanitiesScience and TechnologyLoudi 417000China Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada

Both Sun Wukong in eastern mythology and Transformers in western science fiction animation have profoundly inspired the design of deformable materials and modern *** application scope of intelligent materials,also known as smart materials,which are capable of responding to external stimuli to achieve shape changes,structural reorganization,and functional reconfiguration,is wide-ranging,and it covers areas such as soft robotics and flexible electronics[1–3],4D printing[4,5],biomedical equipment[6,7],sensing devices[8],and energy harvesting systems[9].

关键词： printing harvesting smart

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Electrophoresis Characterization of Nanoplastic Particle Surface Charge in Dilute Aqueous Electrolytes

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environmental engineering science 2024年第11期41卷 467-476页

作者： Lin, Jui-Yen Lee, Ingyu Feng, Cuijuan Kim, Hyunook Huang, Chin-Pao Department of Chemical and Materials Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan Department of Civil and Environmental Engineering University of Delaware NewarkDE United States Department of Environmental Engineering University of Seoul Dongdaemun-gu Korea Republic of

Aggregation, adsorption, and biofilm formation are involved in the fate and transport of nanoplastics in the aquatic environment. These interfacial processes are closely related to surface charge and electrical double layer (EDL) structure. As it is experimentally difficult to obtain surface potential, laser doppler electrophoresis is currently the most popular technique to measure zeta potential, or the potential at shear plane. However, the determination of zeta potential by laser doppler electrophoresis is not a trivial undertaking. Inaccurate zeta potential values could potentially lead to misleading conclusions. This study aims to present a comprehensive method tailored for nanoplastics to accurately measure zeta potential and convert it to surface charge and potential with classical EDL theory. The effect of particle size and number concentration on zeta potential measurement was investigated using monodisperse polystyrene (PS) latex. An optimal number concentration was between 1010 and 1012 #/L to generate sufficient scattered light with minimal interparticle interaction. Six nanoplastics were synthesized from major polymers to acquire the zeta potential at various pH, including low-density polyethylene, high-density polyethylene, polypropylene, PS, polyvinyl chloride, and polyethylene terephthalate. Based on classical EDL theory, the zeta potential measured at various ionic strength was converted to surface potential, revealing that the shear plane was 0.4 to 2.1 nm away from the surface. Finally, the surface charge density of nanoplastics was acquired, which is essential to describe interfacial processes of nanoplastics in the environment. Copyright 2024, Mary Ann Liebert, Inc., publishers.

关键词： Zeta potential

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Three-dimensional lightweight melamine foams modified by MXene sheets and CoNi alloys towards multifunctional microwave absorption

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Nano Research 2025年第2期18卷 377-389页

作者： Nannan Wu Zhengying Shen Yitao Ma Zhizheng Wu Chuanxin Hou Sijie Guo Jian Tian Jiurong Liu School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China School of Environmental and Material Engineering Yantai UniversityYantai 264005China Department of Chemical&Biomolecular Engineering University of TennesseeKnoxvilleTN 37996USA Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education and School of Materials Science and EngineeringShandong UniversityJinan 250061China

Taking the increasing issue of electromagnetic waves(EMW)pollution and the necessity for applications in extreme environments,there is a pressing requirement to create multifunctional microwave absorption materials(MAMs)to meet the current *** this work,we achieved the successful combination of MXene sheets and metal organic framework(MOFs)derived CoNi@C magnetic alloys onto the three dimensional(3D)melamine foam(MF)skeleton using vacuum impregnation and electrostatic self-assembly *** obtained MF@MXene/CoNi@C composite foams achieved outstanding MA performance,with an optimal reflection loss(RL)value of–24.1 dB and a maximum effective absorption bandwidth(EAB)of 6.88 GHz at a thickness of 1.68 mm,effectively covering the whole Ku *** superior MA performance is ascribed to the composite foams’multi-component architecture,distinctive 3D porous structure,and the synergistic impact of multiple loss ***,the MF@MXene/CoNi@C composite foams demonstrate exceptional photothermal conversion,thermal insulation,and infrared stealth capabilities,effectively coping with the demands of applications in extreme *** work serves as a valuable resource and source of inspiration for the development of lightweight broadband,multifunctional efficient MAMs.

关键词： multifunctional microwave absorption MXene thermal insulation infrared stealth

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MoS_(2)as a cocatalyst applied in advanced oxidation processes for enhancing degradation of organic pollutants:a review

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Tungsten 2024年第3期6卷 473-487页

作者： Ming-Hao Fan Cong-Hui Wang Xiang Yu Jun Ding Ao-Qi Xiao Yue Li Wei-Ya Huang School of Material Science and Engineering Henan Polytechnic UniversityJiaozuo 454001China School of Chemical and Printing-Dyeing Engineering Henan International Joint Laboratory of Rare Earth Composite MaterialsHenan University of EngineeringXinzheng 451191China School of Chemistry and Chemical Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Department of Chemical and Environmental Engineering University of CincinnatiCincinnati OH 45221-0012USA

Fenton technology,as a typical advanced oxidation processes(AOPs),can generate reactive oxygen species(ROS)of strong oxidation capacity to degrade organic pollutants,which has attracted wide ***,it is accompanied by the slow Fe^(3+)/Fe^(2+)cycle rate,easy to generate iron sludge and so ***,it has been proven that the inorganic cocatalysts represented by MoS_(2)can effectively solve the above ***,MoS_(2)can accelerate the activation of peroxy mono sulfate(PMS)and peroxodisulfate(PDS)by Fe^(2+).In this paper,MoS_(2)as the cocatalyst in H_(2)O_(2)+Fe^(2+),PMS+Fe^(2+)and PDS+Fe_(2+)were comprehensively ***,the cycling processes of Fe^(3+)/Fe^(2+)in different systems,the cocatalytic effect of MoS_(2)by the exposed active sites,the ROS generation mechanism as well as the microscopic mechanism during the reaction were elaborated *** results indicate that the reductive active sites on the surface of MoS_(2)can promote the regeneration of Fe^(2+)through the cycle between Fe^(3+)/Fe^(2+)and Mo^(4+)/Mo^(5+)/Mo^(6+).Thus,ROS such as·OH,SO_4^(·-)and ^(1)O_(2)with strong oxidizing property can be produced to improve the degradation efficiency of organic *** last,the challenges and developments of MoS_(2)cocatalysts in AOPs for practical applications were *** review contributes to a deeper understanding of the cocatalytic effect of two-dimensional metal sulfides in AOPs and facilitates their industrial application.

关键词： Cocatalyst Fenton reaction Degradation of organic pollutant Molybdenum disufide Reactive oxygen species

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