Nanoscale Gd-Doped CeO2 Buffer Layer for a High Performance Solid Oxide Fuel Cell

Gd 2 O 3 -doped ceria (GCO) is irreplaceable as interface/buffer layer between a mixed conducting cathode such as La0.58Sr0.4Co0.2Fe0.8O3-δ (LSCF) and an 8 mol %Y2O3 stabilized ZrO2 (8YSZ) thin film electrolyte. To meet the demands of high performance, indispensable characteristics of this interface (LSCF/GCO/8YSZ) are (i) no reaction of GCO with LSCF or YSZ and (ii) a GCO layer that is defect-free (closed porosity, no cracks). It is well known that state-of-the-art screen printed and sintered GCO buffer layers are imperfect and ultimately reduce the overall performance. This study concentrates on the evaluation of nanoscaled GCO thin films integrated into anode supported cells (ASC). GCO thin films were deposited on 8YSZ electrolyte by a low temperature metal organic deposition (MOD) process. MOD is preferable because it is a versatile technique for large scale and low cost fabrication for various material compositions. The authors investigated the influence of preparation parameters with respect to chemical homogeneity and film quality (pores, cracks) of GCO thin films with a constant film thickness between 50 nm and 100 nm. Electrochemical performance of anode supported cells employing MOD derived GCO thin films will be presented in terms of ohmic resistance (ASRΩ) and will be evaluated in contrast to screen printed and sintered GCO thick films. Nanoscale MOD derived thin films with low processing temperatures and dense film qualities were vastly superior to state-of-the-art GCO and beneficial to the overall cell performance.

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Fabrication of YBa2Cu3Oy Thin Films on Textured Buffer Layers grown by Plasma Beam Assisted Deposition

Australian Journal of Physics ◽

10.1071/p96055 ◽

1997 ◽

Vol 50 (2) ◽

pp. 381 ◽

Cited By ~ 2

Author(s):

M. Fukutomi ◽

S. Kumagai ◽

H. Maeda

Keyword(s):

Thin Films ◽

Buffer Layer ◽

Large Scale ◽

Buffer Layers ◽

Weak Links ◽

Large Area ◽

Ybco Films ◽

Metallic Substrates ◽

Plasma Beam ◽

A New Technique

A new technique named plasma beam assisted deposition (PBAD) is proposed to grow in-plane textured yttria-stabilised zirconia (YSZ) thin films on polycrystalline metallic substrates as a buffer layer for deposition of YBa2Cu3Oy (YBCO) films. The in-plane texturing of the YBCO films obtained is decisively governed by that of the YSZ buffer layer on which the YBCO grows. Because of a reduction of the weak links at high-angle grain boundaries, a marked increase in the critical current density Jc is observed with improved texturing of the YBCO films. So far, it has been demonstrated that YBCO films with Jc above 105 A cm-2 (77 K, 0 T) can be successfully deposited by a laser ablation technique. The PBAD process proposed here is found to be valuable technologically because it offers a very convenient method to grow textured films on long tape or large area substrates. An attempt was also made to grow textured films simultaneously on one side or both sides of various pieces of tape substrates. The results indicate that PBAD is one potential technique for future large scale application of YBCO films.

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Evaluation of recent advances in recommender systems on Arabic content

Journal Of Big Data ◽

10.1186/s40537-021-00420-2 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Mehdi Srifi ◽

Ahmed Oussous ◽

Ayoub Ait Lahcen ◽

Salma Mouline

Keyword(s):

Recommender Systems ◽

High Performance ◽

Large Scale ◽

State Of The Art ◽

Experimental Results ◽

Recent Advances ◽

Research Gap ◽

Text Preprocessing

AbstractVarious recommender systems (RSs) have been developed over recent years, and many of them have concentrated on English content. Thus, the majority of RSs from the literature were compared on English content. However, the research investigations about RSs when using contents in other languages such as Arabic are minimal. The researchers still neglect the field of Arabic RSs. Therefore, we aim through this study to fill this research gap by leveraging the benefit of recent advances in the English RSs field. Our main goal is to investigate recent RSs in an Arabic context. For that, we firstly selected five state-of-the-art RSs devoted originally to English content, and then we empirically evaluated their performance on Arabic content. As a result of this work, we first build four publicly available large-scale Arabic datasets for recommendation purposes. Second, various text preprocessing techniques have been provided for preparing the constructed datasets. Third, our investigation derived well-argued conclusions about the usage of modern RSs in the Arabic context. The experimental results proved that these systems ensure high performance when applied to Arabic content.

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Effects of the Sputtering Time of AlN Buffer Layer on the Quality of ZnO Thin Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.881-883.1117 ◽

2014 ◽

Vol 881-883 ◽

pp. 1117-1121 ◽

Cited By ~ 1

Author(s):

Xiang Min Zhao

Keyword(s):

Thin Films ◽

Buffer Layer ◽

Rf Magnetron Sputtering ◽

Buffer Layers ◽

Zno Thin Films ◽

Zno Films ◽

Si Substrates ◽

Atomic Force ◽

Structure Morphology ◽

Aln Buffer

ZnO thin films with different thickness (the sputtering time of AlN buffer layers was 0 min, 30 min,60 min, and 90 min, respectively) were prepared on Si substrates using radio frequency (RF) magnetron sputtering system.X-ray diffraction (XRD), atomic force microscope (AFM), Hall measurements setup (Hall) were used to analyze the structure, morphology and electrical properties of ZnO films.The results show that growth are still preferred (002) orientation of ZnO thin films with different sputtering time of AlN buffer layer,and for the better growth of ZnO films, the optimal sputtering time is 60 min.

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Process Design Kit and Design Automation for Flexible Hybrid Electronics

Journal of Microelectronics and Electronic Packaging ◽

10.4071/imaps.925849 ◽

2019 ◽

Vol 16 (3) ◽

pp. 117-123

Author(s):

Tsung-Ching Huang ◽

Ting Lei ◽

Leilai Shao ◽

Sridhar Sivapurapu ◽

Madhavan Swaminathan ◽

...

Keyword(s):

Process Design ◽

Design Automation ◽

High Performance ◽

Large Scale ◽

Low Cost ◽

Thin Film Transistor ◽

Solution Process ◽

Oxide Semiconductor ◽

Wearable Electronics ◽

Wide Range

Abstract High-performance low-cost flexible hybrid electronics (FHE) are desirable for applications such as internet of things and wearable electronics. Carbon nanotube (CNT) thin-film transistor (TFT) is a promising candidate for high-performance FHE because of its high carrier mobility, superior mechanical flexibility, and material compatibility with low-cost printing and solution processes. Flexible sensors and peripheral CNT-TFT circuits, such as decoders, drivers, and sense amplifiers, can be printed and hybrid-integrated with thinned (<50 μm) silicon chips on soft, thin, and flexible substrates for a wide range of applications, from flexible displays to wearable medical devices. Here, we report (1) a process design kit (PDK) to enable FHE design automation for large-scale FHE circuits and (2) solution process-proven intellectual property blocks for TFT circuits design, including Pseudo-Complementary Metal-Oxide-Semiconductor (Pseudo-CMOS) flexible digital logic and analog amplifiers. The FHE-PDK is fully compatible with popular silicon design tools for design and simulation of hybrid-integrated flexible circuits.

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Recent progress in zinc-based redox flow batteries: a review

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/ac4182 ◽

2021 ◽

Author(s):

Guixiang Wang ◽

Haitao Zou ◽

Xiaobo Zhu ◽

Mei Ding ◽

Chuankun Jia

Keyword(s):

High Performance ◽

Large Scale ◽

Electrode Materials ◽

Low Cost ◽

Ion Selectivity ◽

Commercial Application ◽

Environmental Friendliness ◽

Membrane Materials ◽

Redox Flow Batteries ◽

Flow Batteries

Abstract Zinc-based redox flow batteries (ZRFBs) have been considered as ones of the most promising large-scale energy storage technologies owing to their low cost, high safety, and environmental friendliness. However, their commercial application is still hindered by a few key problems. First, the hydrogen evolution and zinc dendrite formation cause poor cycling life, of which needs to ameliorated or overcome by finding suitable anolytes. Second, the stability and energy density of catholytes are unsatisfactory due to oxidation, corrosion, and low electrolyte concentration. Meanwhile, highly catalytic electrode materials remain to be explored and the ion selectivity and cost efficiency of membrane materials demands further improvement. In this review, we summarize different types of ZRFBs according to their electrolyte environments including ZRFBs using neutral, acidic, and alkaline electrolytes, then highlight the advances of key materials including electrode and membrane materials for ZRFBs, and finally discuss the challenges and perspectives for the future development of high-performance ZRFBs.

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Highly responsive screen-printed asymmetric pressure sensor based on laser-induced graphene

Journal of Micromechanics and Microengineering ◽

10.1088/1361-6439/ac388d ◽

2021 ◽

Author(s):

Jiang Zhao ◽

Jiahao Gui ◽

Jinsong Luo ◽

Jing Gao ◽

Caidong Zheng ◽

...

Keyword(s):

Pressure Sensor ◽

Screen Printing ◽

Large Scale ◽

Low Cost ◽

Pressure Sensors ◽

High Sensitivity ◽

Wearable Electronics ◽

Integrated Sensor ◽

Patterned Electrodes ◽

Screen Printed

Abstract Graphene-based pressure sensors have received extensive attention in wearable devices. However, reliable, low-cost, and large-scale preparation of structurally stable graphene electrodes for flexible pressure sensors is still a challenge. Herein, for the first time, laser-induced graphene (LIG) powder are prepared into screen printing ink, and shape-controllable LIG patterned electrodes can be obtained on various substrates using a facile screen printing process, and a novel asymmetric pressure sensor composed of the resulting screen-printed LIG electrodes has been developed. Benefit from the 3D porous structure of LIG, the as-prepared flexible LIG screen-printed asymmetric pressure sensor has super sensing properties with a high sensitivity of 1.86 kPa−1, low detection limit of about 3.4 Pa, short response time, and long cycle durability. Such excellent sensing performances give our flexible asymmetric LIG screen-printed pressure sensor the ability to realize real-time detection of tiny body physiological movements (such as wrist pulse and pronunciation action). Besides, the integrated sensor array has a multi-touch function. This work could stimulate an appropriate approach to designing shape-controllable LIG screen-printed patterned electrodes on various flexible substrates to adapt the specific needs of fulfilling compatibility and modular integration for potential application prospects in wearable electronics.

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Three-Dimensional MoS2/Graphene Hybrid Aerogel as Free-Standing, High-Performance Electrode for Supercapacitor

NANO ◽

10.1142/s1793292020500629 ◽

2020 ◽

Vol 15 (05) ◽

pp. 2050062

Author(s):

Zhaolei Meng ◽

Xiaojian He ◽

Song Han ◽

Zijian Hu

Keyword(s):

Porous Structure ◽

Surface Area ◽

High Performance ◽

Large Scale ◽

Low Cost ◽

Hydrothermal Process ◽

Three Dimensional ◽

Rate Capability ◽

Free Standing ◽

Hybrid Aerogel

Carbon materials are generally employed as supercapacitor electrodes due to their low- cost, high-chemical stability and environmental friendliness. However, the design of carbon structures with large surface area and controllable porous structure remains a daunt challenge. In this work, a three-dimensional (3D) hybrid aerogel with different contents of MoS2 nanosheets in 3D graphene aerogel (MoS2-GA) was synthesized through a facial hydrothermal process. The influences of MoS2 content on microstructure and subsequently on electrochemical properties of MoS2-GA are systematically investigated and an optimized mass ratio with MoS2: GA of 1:2 is chosen to achieve high mechanical robustness and outstanding electrochemical performance in the hybrid structure. Due to the large specific surface area, porous structure and continuous charge transfer network, such MoS2-GA electrodes exhibit high specific capacitance, good rate capability and excellent cyclic stability, showing great potential in large-scale and low-cost fabrication of high-performance supercapacitors.

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High-performance thermoelectric silver selenide thin films cation exchanged from a copper selenide template

Nanoscale Advances ◽

10.1039/c9na00605b ◽

2020 ◽

Vol 2 (1) ◽

pp. 368-376 ◽

Cited By ~ 3

Author(s):

Nan Chen ◽

Michael R. Scimeca ◽

Shlok J. Paul ◽

Shihab B. Hafiz ◽

Ze Yang ◽

...

Keyword(s):

Thin Film ◽

Thin Films ◽

Cation Exchange ◽

High Performance ◽

Low Cost ◽

Copper Selenide ◽

Silver Selenide ◽

Solution Processed

A high-performance n-type thermoelectric Ag2Se thin film via cation exchange using a low-cost solution processed Cu2Se template.

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Electrode Materials for High-Performance Sodium-Ion Batteries

Materials ◽

10.3390/ma12121952 ◽

2019 ◽

Vol 12 (12) ◽

pp. 1952 ◽

Cited By ~ 10

Author(s):

Santanu Mukherjee ◽

Shakir Bin Mujib ◽

Davi Soares ◽

Gurpreet Singh

Keyword(s):

High Performance ◽

Large Scale ◽

Electrode Materials ◽

State Of The Art ◽

Electronic Conductivity ◽

Lithium Ion ◽

Cycle Life ◽

Sodium Ion ◽

Sodium Ion Batteries ◽

Grid Storage

Sodium ion batteries (SIBs) are being billed as an economical and environmental alternative to lithium ion batteries (LIBs), especially for medium and large-scale stationery and grid storage. However, SIBs suffer from lower capacities, energy density and cycle life performance. Therefore, in order to be more efficient and feasible, novel high-performance electrodes for SIBs need to be developed and researched. This review aims to provide an exhaustive discussion about the state-of-the-art in novel high-performance anodes and cathodes being currently analyzed, and the variety of advantages they demonstrate in various critically important parameters, such as electronic conductivity, structural stability, cycle life, and reversibility.

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