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One-step constructing advanced N-doped carbon@metal nitride as ultra-stable electrocatalysts via urea plasma under room temperature

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Chinese Chemical Letters 2024年第11期35卷 486-491页

作者： Tao Tang Chen Li Sipu Li Zhong Qiu Tianqi Yang Beirong Ye Shaojun Shi Chunyang Wu Feng Cao Xinhui Xia Minghua Chen Xinqi Liang Xinping He Xin Liu Yongqi Zhang Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengdu 611731China Department of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China College of Materials Science&Engineering Zhejiang University of TechnologyHangzhou 310014China School of Chemistry and Materials Engineering Changshu Institute of TechnologyChangshu 215500China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 611731China Department of Engineering Technology Huzhou CollegeHuzhou 313000China Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China

Highly active transition metal nitrides are desirable for electrocatalytic reactions,but their long-term stability is still unsatisfactory and thus limiting commercial ***,for the first time,we report a unique and universal room-temperature urea plasma method for controllable synthesis of N-doped carbon coated metal(Fe,Co,Ni,etc.)nitrides arrays *** preformed metal oxides arrays can be successfully converted into metal nitrides arrays with preserved nanostructures and a thin layer of N-doped carbon(N-C)via one-step urea ***,as a representative case,N-C@CoN nanowire arrays are illustrated and corresponding formation mechanism by plasma is ***,the designed N-C@Co N catalysts deliver excellent electrocatalytic activity and long-term stability both in oxygen evolution reaction(OER)and urea oxidation reaction(UOR).For OER,a low overpotential(264 mV at 10 mA/cm^(2))and high stability(>50 h at 20 mA/cm^(2))are *** UOR,a current density of100 m A/cm^(2) is achieved at only 1.39 V and maintain over 100 *** calculations reveal that the synergetic coupling effect of CoN and N-C can significantly facilitate the charge-transfer process,optimize adsorbed intermediates binding strength and further greatly decrease the energy *** strategy provides a novel method for fabrication of N-C@metal nitrides as highly active and stable catalysts.

关键词： Urea plasma Metal nitrides Carbon shell Oxygen evolution reaction Urea oxidation reaction

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Strengthening and deformation mechanism of high-strength CrMnFeCoNi high entropy alloy prepared by powder metallurgy

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Journal of materials science & Technology 2023年第1期132卷 119-131页

作者： Y.Xing C.J.Li Y.K.Mu Y.D.Jia K.K.Song J.Tan G.Wang Z.Q.Zhang J.H.Yi J.Eckert Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai 200444China School of Mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Department of Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 12Leoben A-8700Austria Adjunct with National University of Science and Technology«MISiS» Leninsky Prosp.4Moscow 119049Russia

Multiphase CrMnFeCoNi high-entropy alloys(HEAs)were prepared by a powder metallurgy process com-bining mechanical alloying(MA)and vacuum hot-pressing sintering(HPS).The single-phase face-centered cubic(FCC)HEA powder prepared by MA was sintered into a bulk HEA specimen containing FCC phase matrix along with precipitated M 23 C 6 phase and nanoscaleσphase *** the sintering temper-ature was 1223 K,the ultimate strength reaches 1300±11.6 MPa,and the elongation exceeds 4%±0.6%.Microstructural characterization reveals that the formation of nanoscale particles and deformation twins play critical roles in improving the strain hardening(SH)*** the MA time promoted the formation of the precipitated phase and enhanced the SH ability by increasing the number of precip-itated *** SH capacity increases significantly with increasing sintering temperature,which is attributed to a significant enhancement in the twinning capacity due to grain growth and the reduced number ofσphase *** systematic studies,the planar glide of dislocations was found to be the main mode of deformation,while deformation twinning appeared as an auxiliary deformation mode when the twinning stress was *** the formation of precipitates leads to grain bound-ary and precipitation strengthening effects,crack initiation is more prominent owing to increased grain boundary brittleness around the precipitated M 23 C 6 *** prominence of crack initiation is a contra-diction that must be reconciled with regard to precipitation *** work serves as a useful reference for the preparation of high-strength HEA parts by powder metallurgy.

关键词： High entropy alloy Powder processing Grain reﬁnement Precipitation strengthening Deformation twinning

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Investigation of MgO Seed Layer Crystallinity and Morphology-Dependent Characteristics of NO2 Gas Sensors Using In2O3 Nanorods Grown by Hydrothermal Synthesis Method

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IEEE Sensors Journal 2025年第11期25卷 18777-18784页

作者： Liu, Bo-Yi Wu, Mu-Ju Chang, Ting-Chun Lee, Ching-Ting Lee, Hsin-Ying National Cheng Kung University Department of Photonics Tainan701 Taiwan National Cheng Kung University Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing Tainan701 Taiwan National Cheng Kung University Department of Photonics and the Institute of Microelectronics Department of Electrical Engineering Tainan701 Taiwan Yuan Ze University Department of Electrical Engineering Taoyuan320 Taiwan National Cheng Kung University Department of Photonics and the Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing Tainan701 Taiwan

This study investigated the effects and influences of MgO seed layer and morphology on the characteristics of NO2 gas sensors fabricated using the In2O3 nanorod sensing membranes grown by the hydrothermal synthesis method. The morphologies of In(OH)3 nanorods were modified using different MgO seed layers and different precursor solutions of indium chloric tetrahydrate and urea. The In(OH)3 nanorods were converted into In2O3 nanorods in a hydrogen ambience at 300 oC for 10 min. Using the hydrothermal synthesis method with indium chloric tetrahydrate of 65 mM and urea of 1.42 M, the optimal response of the NO2 gas sensors was 219.1 by using the In(OH)3 nanorods grown on 100-nm-thick MgO seed layers sputtered with RF power of 100 W and annealed in oxygen ambience at 500 oC for 2 hours. The response time and recovery time of the resulting NO2 gas sensors were 42 sec and 82 sec, respectively. © 2001-2012 IEEE.

关键词： Nanorods

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Low-threshold surface-emitting colloidal quantum-dot circular Bragg laser array

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Light(science & Applications) 2025年第1期14卷 238-248页

作者： Yangzhi Tan Yitong Huang Dan Wu Yunjun Wang Xiao Wei Sun Hoi Wai Choi Kai Wang State Key Laboratory of Optical Fiber and Cable Manufacture Technology Institute of Nanoscience and ApplicationsDepartment of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhenChina Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina College of New Materials and New Energies Shenzhen Technology UniversityShenzhenChina Suzhou Xingshuo Nanotech Co. Ltd.(Mesolight)SuzhouChina

Colloidal quantum dots(CQDs)are attractive gain media due to their wavelength-tunability and low optical gain ***,CQD lasers,especially the surface-emitting ones,are promising candidates for display,sensing and ***,it remains challenging to achieve a low-threshold surface-emitting CQD laser array with high stability and integration *** this purpose,it is necessary to combine the improvement of CQD material and laser ***,we have developed high-quality CQD material with core/interlayer/graded shell structure to achieve a low gain threshold and high ***,surface-emitting lasers based on CQD-integrated circular Bragg resonator(CBR)have been achieved,wherein the near-unity mode confinement factor(Γof 89%)and high Purcell factor of 22.7 attributed to the strong field confinement of CBR enable a low lasing threshold of 17μJ cm^(-2),which is 70%lower than that(56μJ cm^(-2))of CQD vertical-cavity surface-emitting *** from the high quality of CQD material and laser cavity,the CQD CBR laser is capable of continuous stable operation for 1000 hours(corresponding to 3.63×10^(8)pulses)at room *** performance is the best among solution-processed lasers composed of ***,the miniaturized mode volume in CBR allows the integration of CQD lasers with an unprecedentedly high density above 2100 pixels per ***,the proposed low-threshold,stable and compactly integrated CQD CBR laser array would advance the development of CQD laser for practical applications.

关键词： resonator circular surface

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Boosting Monolayer Transition Metal Dichalcogenides Growth by Hydrogen-Free Ramping during Chemical Vapor Deposition

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Nano Letters 2024年第27期24卷 8277-8286页

作者： Liu, Hongwei Zhang, Tianyi Wu, Peng Lee, Hae Won Liu, Zhenjing Tang, Tsz Wing Tang, Shin-Yi Kang, Ting Park, Ji-Hoon Wang, Jun Zhang, Kenan Zheng, Xudong Peng, Yu-Ren Chueh, Yu-Lun Liu, Yuan Palacios, Tomás Kong, Jing Luo, Zhengtang Department of Chemical and Biological Engineering Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology William Mong Institute of Nano Science and Technology and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology Kowloon999077 Hong Kong Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Materials Science and Engineering National Tsing-Hua University Hsinchu30013 Taiwan Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and Electronics Hunan University Changsha410082 China

The controlled vapor-phase synthesis of two-dimensional (2D) transition metal dichalcogenides (TMDs) is essential for functional applications. While chemical vapor deposition (CVD) techniques have been successful for transition metal sulfides, extending these methods to selenides and tellurides often faces challenges due to uncertain roles of hydrogen (H2) in their synthesis. Using CVD growth of MoSe2 as an example, this study illustrates the role of a H2-free environment during temperature ramping in suppressing the reduction of MoO3, which promotes effective vaporization and selenization of the Mo precursor to form MoSe2 monolayers with excellent crystal quality. As-synthesized MoSe2 monolayer-based field-effect transistors show excellent carrier mobility of up to 20.9 cm2/(V·s) with an on-off ratio of 7 × 107. This approach can be extended to other TMDs, such as WSe2, MoTe2, and MoSe2/WSe2 in-plane heterostructures. Our work provides a rational and facile approach to reproducibly synthesize high-quality TMD monolayers, facilitating their translation from laboratory to manufacturing. © 2024 American Chemical Society.

关键词： Monolayers

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Evolution of precipitate and precipitate/matrix interface in Al-Zn-Mg-Cu(-Ag)alloys

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Journal of materials science & Technology 2023年第7期138卷 157-170页

作者： Xingpu Zhang Zhongkang Han Liangliang Xu Haohan Ni Xiaojuan Hu Haofei Zhou Yu Zou Jiangwei Wang Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials Institute of WenzhouZhejiang UniversityWenzhou 325006China Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6Berlin 14195Germany Department of Electrical Engineering Hanyang UniversitySeoul 04763South Korea Center for X-Mechanics Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China Department of Materials Science and Engineering University of TorontoTorontoCanada

Evolution of precipitate and precipitate/matrix interface in artificially aged Al-Zn-Mg-Cu(-Ag)alloys has been systematically *** the early stage of ageing,Ag,as a fast diffuser,can promote the formation of solute pairs and small *** clusters are further demonstrated to be able to act as precursors forη’precipitates by in-situ STEM *** prolonged ageing time,the precipitate/matrix interface evolves from the Zn-dominated interface between early-stageη’and Al matrix to the Zn and Mg co-segregatedη’/Al andη_(2)/Al ***η’/Al interfacial layers are shown to precede the formation ofη’,while theη_(2)/Al interfaces are found to be closely related to the thickening process ofη_(2)and the involved particular atomic movements are *** observations and DFT calculations re-veal that forη’andη_(2),Ag can dissolve into the precipitate as well as locate at the precipitate/matrix interface without showing *** Cu,its dissolution in the precipitate and segregation on the interface mainly occur forη_(2)rather thanη’.The incorporation of Ag and Cu does not change the defined precipitate structure.

关键词： Al-Zn-Mg-Cu(Ag)alloys Precipitation Precipitate/matrix interface Scanning transmission electron microscopy Density functional theory

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A Ternary Co-polyimide for High-temperature Capacitive Energy Storage 5

A Ternary Co-polyimide for High-temperature Capacitive Energ...

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5th IEEE International Conference on Dielectrics, ICD 2024

作者： Li, Manxi Zhu, Yujie He, Jinliang Li, Qi Tsinghua University Department of Electrical Engineering Beijing100086 China University of Wisconsin-Madison Department of Materials Science and Engineering MadisonWI53706 United States

ISBN: (纸本)9798350308976

The development of modern power electronic systems places increasing demands on polymer dielectrics for continuous operation under extreme conditions of high temperature and high electric field. However, the insulating and thermal stability of current polymer dielectrics are often contradictory and mutually exclusive. Herein, we report a ternary co-polyimide that introduces both a highly rigid main-chains and saturated alicyclic side-chains. The former ensures the stability of the copolymer at elevated temperatures and reduces intrachain charge transfer due to its isopropyl structural units with large dihedral angles. The latter increases the molecular chain spacing and decreases interchain charge transfer due to its bulky alicyclic side groups. The resultant copolymer shows decent discharge energy density with 90% charge-discharge efficiency at 200 °C (6.1 J/cm3) and 250 °C (3.1 J/cm3), far exceeding those of conventional dielectric polymers and polymer composites. Here a completely new dimension is offered for the molecular design of polymers, giving rise to well-balanced thermal and dielectric properties, and ultimately the desired capacitive energy storage performance at high temperatures. The molecular design strategy in this work regulates the charge transfer process based on the intrinsic structure of the polymer and provides a new perspective for the future development of advanced high-temperature polymer dielectrics. © 2024 IEEE.

关键词： charge transfer copolymer dielectric polymers energy storage performance high-temperature capacitors

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Porphyrin-Grafted Poly(ethylene terephthalate) as a Reusable and Highly Selective Colorimetric Probe for Mercuric Ion Contaminants in Aqueous Samples

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ACS Applied materials and Interfaces 2024年第30期16卷 39195-39205页

作者： Atayde, Eduardo C. Takenaka, Yasumasa Abe, Hideki Wu, Ming-Rou Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Department of Chemistry National Tsing Hua University Department of Chemical Engineering National Taiwan University Bioplastic Research Team RIKEN Center for Sustainable Resource Science Department of Chemical Engineering and Materials Science Yuan Ze University Department of Chemical Engineering Chung Yuan Christian University

Heavy metals are the most hazardous water pollutants, with severe health and environmental consequences. Among these, mercuric (Hg2+) ions are known to cause detrimental health issues in both humans and aquatic life. ... 详细信息

Heavy metals are the most hazardous water pollutants, with severe health and environmental consequences. Among these, mercuric (Hg²⁺) ions are known to cause detrimental health issues in both humans and aquatic life. Due to this, several analytical techniques have been devised to detect and quantify the amount of this ion. However, most of these require advanced instrumentation, prolonged analysis time, and sample preparation. In this study, a low-cost and highly reusable colorimetric probe was developed by grafting porphyrin to poly(ethylene terephthalate) sheets using an oxazoline polymer as covalent adhesive. Upon exposure to trace amounts of Hg²⁺ in solution, the fabricated material visually transitioned from faint brownish pink to green by the complexation mechanism. Additionally, the transparency of this probe allowed the quantitative spectrophotometric determination of the Hg²⁺ concentration in aqueous samples. It was also shown that the material is highly stable, which can be reused for more than 50 times without significant decline in its performance, hence, making it suitable for the onsite monitoring of mercuric ion contamination in different bodies of water. © 2024 The Authors. Published by American Chemical Society.

关键词： colorimetric probe mercuric ion oxazoline PET porphyrin

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Chlorine-rich lithium argyrodites enables superior performances for solid-state Li-Se batteries at wide temperature range

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Rare Metals 2022年第12期41卷 4065-4074页

作者： Jin-Yan Lin Shuai Chen Jia-Yang Li Dian Yu Xiang-Ling Xu Chuang Yu Shao-Qing Chen Xue-Fei Miao Lin-Feng Peng Chao-Chao Wei Chong-Xuan Liu Shi-Jie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Materials Huazhong University of Science and TechnologyWuhan 430074China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Advanced Metallic and Intermetallic Materials Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

All-solid-state Li-Se battery shows great potential as a candidate for next-generation energy storage devices due to its high energy density and ***,the low ionic conductivity of the solid electrolytes and large volume changes of Se active materials are two of the major issues that limit its ***,a simple solid-state reaction method is applied to synthesize chlorine-rich argyrodite Li_(5.5)PS_(4.5)CI_(1.5)electrolyte with high conductivity of 6.25 mS·cm^(-1)at room *** nanotube(CNT)is introduced as the host for Se to obtain Se/CNT composite with both enhanced electronic conductivity and lower volume expansion during the electrochemical reaction ***-solid-state Li-Se battery using Li_(5.5)PS_(4.5)CI_(1.5)as solid electrolyte combined with Se/CNT cathode and Li-In anode shows a discharge capacity of 866 mAh·g-1for the 2nd cycle under0.433 mA·cm-2at room ***,the assembled battery delivers a high discharge capacity of1026 mAh·g^(-1)for the 2nd cycle when cycled at the same current density at 60℃and maintains a discharge capacity of 380 mAh·g^(-1)after 150 *** to the high Li-ion conductivity of Li_(5.5)PS_(4.5)CI_(1.5)electrolyte,the assembled battery displays a high discharge capacity of 344 mAh·g^(-1)under 0.113 mA·cm^(-2)at-20℃C and remains 66.1%after200 *** addition,this all-solid-state Li-Se battery shows ultralong cycling performances up to 1000 cycles under 0.433 mA·cm^(-2)at-20℃.This work offers the design clue to fabricate the all-solid-state Li-Se battery workable at different operating temperatures with an ultralong cycling life.

关键词： Lithium argyrodite Chlorine-rich All-solidstate Li-Se batteries Operating temperatures Long cycling performances

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A Burst Mode and Variable Frequency Voltage Sharing Control Mechanism for an Adjustable High Voltage Pulsed Converter

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IEEE Journal of Emerging and Selected Topics in Power Electronics 2023年第2期11卷 1888-1900页

作者： Lin, Chang-Hua Ahmad, Javed Li, Ren-Hao Liu, Hwa-Dong National Taiwan University of Science and Technology Department of Electrical Engineering Taipei106 Taiwan National Taiwan Normal University Undergraduate Program of Vehicle and Energy Engineering Taipei106 Taiwan

This article presents a modular adjustable high-voltage pulse (MAHVP) generation system. The proposed MAHVP generation system uses a combination of full-bridge LLC resonant converters whose input terminals are connected in parallel and whose output terminals are in series to boost the output voltage;input parallel output series configuration efficiently increases the power holding capabilities of the overall system. The MAHVP generation system uses a novel burst mode and variable frequency voltage sharing (BMVFVS) control mechanism, the BMVFVS control mechanism senses the type of load if the MAHVP generation system needs to operate at a heavy load, it uses the variable frequency voltage sharing method to divide the power equally between the modules to enhance the overall performance. For light load conditions, the MAHVP generation system operates in burst mode, and the BMVFVS control mechanism combined with the frequency modulation technique is used to control the amplitude and pulsewidth of the output voltage smoothly and efficiently. A hardware prototype of 2.4 kW is developed, and experimental results are taken to verify the feasibility and validity of the proposed system, the maximum output voltage of the developed two-module prototype is tested up to 6 kV at the high efficiency of 97%. © 2013 IEEE.

关键词： Power converters

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