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Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries

escience 2022年第1期2卷 110-115页

作者： Ye Zhang Lihong Zhao Yanliang Liang Xiaojun Wang Yan Yao Department of Electrical and Computer Engineering Materials Science and Engineering ProgramUniversity of HoustonHoustonTX77204USA Texas Center for Superconductivity at the University of Houston HoustonTX77204USA

Redox polymers are a class of high-capacity, low-cost electrode materials for electrochemical energy storage, butthe mechanisms governing their cycling stability are not well understood. Here we investigate the effect of anionson the longevity of a p-dopable polymer through comparing two aqueous zinc-based electrolytes. Galvanostaticcycling studies reveal the polymer has better capacity retention in the presence of triflate anions than that withsulfate anions. Based on electrode microstructural analysis and evolution profiles of the cell stacking pressure, theorigin of capacity decay is ascribed to mechanical fractures induced by volume change of the polymer activematerials during repeated cycling. The volume change of the polymer with the triflate anion is 61% less than thatwith the sulfate anion, resulting in fewer cracks in the electrodes. The difference is related to the different anionsolvation structures—the triflate anion has fewer solvated water molecules compared with the sulfate anion,leading to smaller volume expansion. This work highlights that anions with low solvation degree are preferablefor long-term cycling.

关键词： Aqueous batteries Polymer electrode Anions Volume chang

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Robustness of triple-cation perovskite photo-absorbers under exposure to gamma-ray radiation

Robustness of triple-cation perovskite photo-absorbers under...

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2024 IEEE MetroCon, MetroCon 2024

作者： Gabaldon, Eli Jones, Brendan Kenarangui, Rasool Zhou, Weidong Kaul, Anupama B. University of North Texas Department of Electrical Engineering DentonTX76207 United States University of Texas at Arlington Department of Electrical Engineering ArlingtonTX76019 United States University of North Texas Department of Materials Science and EngineeringElectrical Engineering DentonTX76207 United States

ISBN: (纸本)9798331507640

Halide perovskites have now garnered significant attention for their attractive photoabsorption features, including in detectors and solar cells. Their photoabsorption robustness in high, ambient radiation particularly ionizing gamma radiation (γ-ray), is also highly relevant for certain applications in nuclear-rich environments. In this work, we provide an initial assessment of triple-cation perovskites (TCPs) with the specific formulation comprised of Cs0.05FA0.79MA0.16PbI2.45Br0.55, after exposure to γ-ray radiation. The TCP's characterization includes examining photoluminescence (PL) emission of spin-cast films, while the optoelectronic measurements of the photocurrent (Iph) showed the devices to be relatively robust after exposure to the ambient radiation. This preliminary study is an initial step to continue to examine the intrinsic properties TCPs under exposure to ionizing radiation for next generation detectors, and related device applications. © 2024 IEEE.

关键词： Perovskite

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Optimizing Different Methods of Fabricating 3D Printed UV Blocking Sheets for Solar Cells 1

Optimizing Different Methods of Fabricating 3D Printed UV Bl...

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1st Renewable Energy Technologies and Modern Communications Systems: Future and Challenges Conference, RETMCS 2024

作者： Alhindi, Amjad Fawzi Elatab, Nazek Baawad, Lujain Khalid Bahabry, Rabab R. Allam, Fahad Laboratory Electrical and Computer Engineering Computer Electrical Mathematical Science and Engineering Thuwal Saudi Arabia College of Science Department of Physical Sciences Jeddah21589 Saudi Arabia Materials Science and Engineering Department King Fahd University of Petroleum and Minerals Dhahran31261 Saudi Arabia

ISBN: (纸本)9798331519445

This study investigates the fabrication of innovative UV-blocking sheets that effectively transmit visible light while simultaneously obstructing harmful ultraviolet (UV) radiation, utilizing Cerium Oxide (CeO2) and Zinc Oxide (ZnO) nanoparticles as UV-blocking agents. Three distinct fabrication methods were explored: The Powder Method, where nanoparticles were incorporated directly into polydimethylsiloxane (PDMS);the Ball milling Mixture method, which involved mixing nanoparticles through ball milling;and the Solvent-Based Mixture method, where nanoparticles were dissolved, mixed, and dried;before incorporation into PDMS. Samples were produced using a 3D printing technique, which is Direct Ink Writing (DIW) and characterized for their optical properties via UV-Vis spectroscopy. The results indicated CeO2 demonstrated superior UV-blocking capabilities (a maximum blockage of ~99%) compared to ZnO, while maintaining high transmittance for visible light (a maximum of ~90%). Notably, the solvent-based method exhibited better results than the ball milling method;however, the powder method had the best results. Therefore, this investigation offers a promising solution for solar panel protection that aligns with Saudi Arabia's Vision 2030 energy objectives. The relentless exposure of devices, particularly solar cells, to harmful UV radiation poses a formidable challenge and leads to annual degradation rates of between −0.8% and −4.9%, besides other factors. These findings underscore the critical importance of developing effective UV-blocking solutions. ©2024 IEEE.

关键词： Polydimethylsiloxane

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Effect of High-k Oxide materials on Amorphous Indium Gallium Zinc Oxide (α-IGZO) Channel in Top Gate Field Effect Transistors

Effect of High-k Oxide Materials on Amorphous Indium Gallium...

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International Symposium, Seminar, and Exhibition, Display Week 2024

作者： Alshanbari, Reem Durnan, Oliver Guo, Huaiqian Eizenberg, Moshe Kymissis, Ioannis Department of Electrical Engineering Columbia University New YorkNY United States Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa Israel

The gate dielectric plays a significant role in improving the electrical performance of field-effect transistors. Here, we integrated high-k and low-k bilayer gate dielectrics with (~10 nm) α-IGZO FETs. Our results show that HfO2/SiO2 gated devices provide high electron mobility due to higher carrier concentration and lower trap density at the semiconductor-gate dielectric interface. © 2024, John Wiley and Sons Inc. All rights reserved.

关键词： Gate dielectrics

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Circular SIW Microwave Sensor for Methanol Detection in Spurious Liquors

Circular SIW Microwave Sensor for Methanol Detection in Spur...

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2024 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2024

作者： Azad, Prakrati Kumari, Ankita Akhtar, M. Jaleel Indian Institute of Technology Kanpur Kanpur India Department of Electrical Engineering Indian Institute of Technology Kanpur Kanpur India Department of Electrical Engineering Materials Science IIT Kanpur Kanpur India

ISBN: (纸本)9798350379693

Local or spurious liquors are alcoholic drinks being illicitly produced in crude settings with very less control on dual step production process, i.e., fermentation and distillation. Due to the uncontrolled manufacturing setup, the concentration of a byproduct like methanol in these types of spurious liquors may also be substantially higher, in addition to the potable psychoactive solvent i.e., ethanol. It may be noted that the presence of methanol of above 5% concentration in alcoholic drinks can cause visual impairment and mortality, and hence its concentration level should monitored and regulated. The conventional chromatography-spectroscopy requires exorbitant equipment and highly skilled personnel, limiting its widespread usage for this purpose. In this work, a circular SIW based microwave sensor operating in S-band with a high-quality factor (Q) of 195 is proposed to accurately detect the methanol concentration in alcoholic drinks. The structure is simulated using CST-MWS, and the prototype is fabricated and tested. The fabricated RF sensor is able to provide good sensitivity to facilitate detection of 1.1 MHz/unit percent concentration of methanol in ethanol (v/v) with a minimum detected methanol concentration of 5% (v/v) in ethanol i.e., the maximum permissible limit of methanol in alcoholic beverages. © 2024 IEEE.

关键词： Microwave sensors

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AMC based Antenna Sensor for Wireless Testing and Monitoring of Dielectric materials

AMC based Antenna Sensor for Wireless Testing and Monitoring...

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2024 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2024

作者： Kumar, Abhishek Azad, Prakrati Akhtar, M. Jaleel Department of Electrical Engineering Indian Institute of Technology Kanpur Kanpur India Indian Institute of Technology Kanpur Kanpur India Department of Electrical Engineering Materials Science IIT Kanpur Kanpur India

ISBN: (纸本)9798350379693

A non contact artificial magnetic conductor (AMC)based antenna sensor is proposed for retrieving the permittivity of solid materials. The proposed sensor consists of a coplanar waveguide (CPW)-fed antenna with suppressed harmonics and a specially designed AMC reflector. The periodic AMC reflector having a wide bandwidth of 467.61 MHz is integrated with the antenna to increase the overall gain and the electric field strength in the sensing region. The overall antenna-based sensor structure is simulated using the CST Studio to optimize various parameters for the optimum performance. A numerical model is developed for the estimation of the permittivity of the test specimen in terms of its measured resonant frequency and the thickness. It is observed that the permittivity of the test specimen using the proposed scheme can be estimated with an average error of 5%. The proposed antenna sensor can be used for real-time wireless sensing and monitoring applications. © 2024 IEEE.

关键词： Coplanar waveguides

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Effect of Plastic Deformation on Microstructure and Properties of Cu-(1 wt%-6 wt%) Ag Alloy

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Journal of Wuhan University of Technology(materials science) 2024年第3期39卷 747-753页

作者：茹亚东 ZHANG Zhongyuan 高召顺 ZHANG Ling ZUO Tingting XUE Jiangli TANG Zhixiang DA Bo LIU Yongsheng XIAO Liye Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China Department of Physics Shanghai University of Electric PowerShanghai 201306China University of Chinese Academy of Sciences Beijing 100190China International Joint Labora-tory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Research and Services Division of Materials Data and Integrated System National Institute for Materials ScienceTsukuba 305-0047Japan

In the present study,the Cu-(1 wt%-6 wt%)Ag alloys were prepared by melting,forging and wire *** effects of plastic deformation on microstructure evolution and properties of the alloys were *** results show that non-equilibrium eutectic colonies exist in the Cu-(3 wt%-6 wt%)Ag alloy and no eutectic colonies in the 1 wt%-2 wt%Ag containing *** eutectic colonies are aligned along the drawing direction and refined with the increase of draw *** to the refinement of eutectic colonies,the Cu-Ag alloy exhibits higher strength with the increase of draw *** Cu-6Ag alloy exhibits excellent comprehensive properties with a strength of 930 MPa and a conductivity of 82%IACS when the draw ratio reaches 5.7.

关键词： Cu-Ag alloy high strength and high conductivity microstructure eutectic structure strengthening mechanism

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Transferable,highly crystalline covellite membrane for multifunctional thermoelectric systems

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InfoMat 2024年第11期6卷 66-80页

作者： Myungwoo Choi Geonhee Lee Yea-Lee Lee Hyejeong Lee Jin-Hoon Yang Hanhwi Jang Hyeonseok Han MinSoung Kang Seonggwang Yoo A-Rang Jang Yong Suk Oh Inkyu Park Min-Wook Oh Hosun Shin Seokwoo Jeon Jeong-O Lee Donghwi Cho Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea Thin Film Materials Research Center Korea Research Institute of Chemical TechnologyDaejeonRepublic of Korea Chemical Data-Driven Research Center Korea Research Institute of Chemical TechnologyDaejeonRepublic of Korea Division of Chemical and Material Metrology Korea Research Institute of Standards and ScienceDaejeonRepublic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea Therapeutics&Biotechnology Division Drug Discovery Platform Research CenterKorea Research Institute of Chemical TechnologyDaejeonRepublic of Korea Querry Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIllinoisUSA Division of Electrical Electronic and Control EngineeringKongju National UniversityCheonanRepublic of Korea Department of Mechanical Engineering Changwon National UniversityChangwonRepublic of Korea Department of Materials Science and Engineering Hanbat National UniversityDaejeonRepublic of Korea Advanced Materials and Chemical Engineering University of Science and TechnologyDaejeonRepublic of Korea

Emerging freestanding membrane technologies,especially using inorganic thermoelectric materials,demonstrate the potential for advanced thermoelectric ***,using rare and toxic elements during material processing must be ***,we present a scalable method for synthesizing highly crystalline CuS membranes for thermoelectric *** sulfurizing crystalline Cu,we produce a highly percolated and easily transferable network of submicron CuS *** CuS membrane effectively separates thermal and electrical properties to achieve a power factor of 0.50 mW m^(-1) K^(-2) and thermal conductivity of 0.37 W m^(-1) K^(-1) at 650 K(estimated value).This yields a record-high dimensionless figure-of-merit of 0.91 at 650 K(estimated value)for ***,integrating 12 CuS devices into a module resulted in a power generation of4μW atΔT of 40 K despite using a straightforward configuration with only p-type ***,based on the temperature-dependent electrical characteristics of CuS,we develop a wearable temperature sensor with antibacterial properties.

关键词： copper sulfide flexible thermoelectric generator multifunctional thermoelectric systems sulfurization thermoelectric membrane

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Design of a 12x12 Element Smart Radar Antenna at 9.3 GHz for Beam Forming Applications 4

Design of a 12x12 Element Smart Radar Antenna at 9.3 GHz for...

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4th International Conference on electrical engineering and Informatics, ICon EEI 2024

作者： Rahayu, Yusnita Cheng, Huanyu Larry Pirwanhadi, Faril Safrianti, Ery Astuti, Dian Widi Saputera, Yussi Perdana Faculty of Engineering Universitas Riau Department of Electrical Engineering Pekanbaru Indonesia PennState University Department of Materials Science and Engineering PA United States Universitas Mercu Buana Department of Electrical Engineering Jakarta Indonesia PT. Radar Telekomunikasi Indonesia Bandung Indonesia

ISBN: (纸本)9798331540791

This study focuses on designing a Multiple-Input Multiple-Output (MIMO) antenna for smart radar applications in the 9.3 GHz frequency band. The antenna attains an extended range by polarizing radiation in a particular direction. The design incorporates MIMO antennas with 4x4, 8x8, and 12x12 elements, utilizing RT Duroid 3010 as the substrate material with a thickness of 1.28 mm. Simulation results indicate that the antenna operates at a frequency of 9.3 GHz. The 4x4 MIMO element demonstrates a return loss of -27.071 dB and a bandwidth of 27.8 MHz, producing a directional radiation pattern with a gain of 6.35 dB. The 8x8 MIMO element achieves a return loss of -15.162 dB and a bandwidth of 14.9 MHz, resulting in a directional radiation pattern with a gain of 9.65 dB. The 12x12 element exhibits a return loss of -12.566 dB and a bandwidth of 12.7 MHz, also generating a directional pattern with a gain of 18.2 dB. Overall, the developed antenna shows a narrower bandwidth compared to other studies, enhancing its efficiency in signal transmission and reception while maintaining stable gain across frequencies for consistent performance. © 2024 IEEE.

关键词： Bandwidth

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Graphene Bridge Heterostructure Devices for Negative Differential Transconductance Circuit Applications

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Nano-Micro Letters 2023年第2期15卷 161-171页

作者： Minjong Lee Tae Wook Kim Chang Yong Park Kimoon Lee Takashi Taniguchi Kenji Watanabe Min‑gu Kim Do Kyung Hwang Young Tack Lee Department of Electrical and Computer Engineering Inha UniversityIncheon 22212Republic of Korea Department of Materials Science and Engineering The University of Texas at DallasRichardsonTX 75080USA Center for Opto‑Electronic Materials and Devices Post‑Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Physics Kunsan National UniversityGunsan 54150Republic of Korea Advanced Materials Laboratory National Institute for Materials ScienceTsukuba 305‑0044Japan Department of Information and Communication Engineering Inha UniversityIncheon 22212Republic of Korea Division of Nanoscience and Technology KIST SchoolUniversity of Science and Technology(UST)Seoul 02792Republic of Korea Department of Electronic Engineering Inha UniversityIncheon 22212Republic of Korea

Two-dimensional van der Waals(2D vdW)material-based heterostructure devices have been widely studied for high-end electronic applications owing to their heterojunction *** this study,we demonstrate graphene(Gr)-bridge heterostructure devices consisting of laterally series-connected ambipolar semiconductor/Gr-bridge/n-type molybdenum disulfide as a channel material for field-effect transistors(FET).Unlike conventional FET operation,our Gr-bridge devices exhibit nonclassical transfer characteristics(humped transfer curve),thus possessing a negative differential *** phenomena are interpreted as the operating behavior in two series-connected FETs,and they result from the gate-tunable contact capacity of the Gr-bridge ***-value logic inverters and frequency tripler circuits are successfully demonstrated using ambipolar semiconductors with narrow-and wide-bandgap materials as more advanced circuit applications based on non-classical transfer ***,we believe that our innovative and straightforward device structure engineering will be a promising technique for future multi-functional circuit applications of 2D nanoelectronics.

关键词： Graphene bridge Heterostructure device Non-classical transfer characteristics Multi-value logic inverter Frequency tripler

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