Optimization of wafer orientation and electrode materials for LGS high-temperature SAW sensors

2012 ◽  
Author(s):  
S. Sakharov ◽  
A. Zabelin ◽  
S. Kondratiev ◽  
D. Richter ◽  
H. Fritze ◽  
...  
Keyword(s):  
High Temperature ◽  
Electrode Materials ◽  
Wafer Orientation

scholarly journals High-Temperature Reliability of GaN Electronic Devices

2000 ◽  
Vol 5 (S1) ◽  
pp. 369-375 ◽  
Author(s):  
Seikoh Yoshida ◽  
Joe Suzuki
Keyword(s):  
High Temperature ◽  
Electrode Materials ◽  
Secondary Ion Mass Spectrometry ◽  
Current Injection ◽  
Current Gain ◽  
Semiconductor Interface ◽  
Gas Source ◽  
Transmission Electron ◽  
Continuous Current ◽  
Junction Transistor

High-quality GaN was grown using gas-source molecular-beam epitaxy (GSMBE). The mobility of undoped GaN was 350 cm2/Vsec and the carrier concentration was 6×1016 cm−3 at room temperature. A GaN metal semiconductor field-effect transistor (MESFET) and an n-p-n GaN bipolar junction transistor (BJT) were fabricated for high-temperature operation. The high-temperature reliability of the GaN MESFET was also investigated. That is, the lifetime of the FET at 673 K was examined by continuous current injection at 673 K. We confirmed that the FET performance did not change at 673 K for over 1010 h. The aging performance of the BJT at 573 K was examined during continuous current injection at 573 K for over 850 h. The BJT performance did not change at 573 K. The current gain was about 10. No degradation of the metal-semiconductor interface was observed by secondary ion-mass spectrometry (SIMS) and transmission electron microscopy (TEM). It was also confirmed by using Si-ion implantation that the contact resistivity of the GaN surface and electrode materials could be lowered to 7×10−6 ohmcm2.

High-temperature properties of (La,Ca)(Fe,Mg,Mo)O3-δ perovskites as prospective electrode materials for symmetrical SOFC

2018 ◽  
Vol 258 ◽  
pp. 1-10 ◽  
Author(s):  
S.Ya. Istomin ◽  
A.V. Morozov ◽  
M.M. Abdullayev ◽  
M. Batuk ◽  
J. Hadermann ◽  
...  
Keyword(s):  
High Temperature ◽  
Electrode Materials ◽  
High Temperature Properties ◽  
Symmetrical Sofc

scholarly journals Improving the Stability of High-Voltage Lithium Cobalt Oxide with a Multifunctional Electrolyte Additive: Interfacial Analyses

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 609
Author(s):  
Xing-Qun Liao ◽  
Feng Li ◽  
Chang-Ming Zhang ◽  
Zhou-Lan Yin ◽  
Guo-Cong Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Cobalt Oxide ◽  
High Voltage ◽  
Electrode Materials ◽  
High Energy ◽  
High Energy Density ◽  
Side Reactions ◽  
Lithium Cobalt Oxide ◽  
Electrolyte Additive ◽  
Lithium Cobalt

In recent years, various attempts have been made to meet the increasing demand for high energy density of lithium-ion batteries (LIBs). The increase in voltage can improve the capacity and the voltage platform performance of the electrode materials. However, as the charging voltage increases, the stabilization of the interface between the cathode material and the electrolyte will decrease, causing side reactions on both sides during the charge–discharge cycling, which seriously affects the high-temperature storage and the cycle performance of LIBs. In this study, a sulfate additive, dihydro-1,3,2-dioxathiolo[1,3,2]dioxathiole 2,2,5,5-tetraoxide (DDDT), was used as an efficient multifunctional electrolyte additive for high-voltage lithium cobalt oxide (LiCoO2). Nanoscale protective layers were formed on the surfaces of both the cathode and the anode electrodes by the electrochemical redox reactions, which greatly decreased the side reactions and improved the voltage stability of the electrodes. By adding 2% (wt.%) DDDT into the electrolyte, LiCoO2 exhibited improved Li-storage performance at the relatively high temperature of 60 °C, controlled swelling behavior (less than 10% for 7 days), and excellent cycling performance (capacity retention rate of 76.4% at elevated temperature even after 150 cycles).

scholarly journals pH Sensitivity Estimation in Potentiometric Metal Oxide pH Sensors Using the Principle of Invariance

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Siddharth Ravichandran ◽  
Chockalingam Thiagarajan ◽  
Ponnusamy Senthil Kumar
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Metal Oxide ◽  
Electrode Material ◽  
Electrode Materials ◽  
Ph Sensitivity ◽  
Dielectric Constants ◽  
Engineering Model ◽  
Ph Sensors ◽  
Sensor Electrode

A numerically solvable engineering model has been proposed that predicts the sensitivity of metal oxide- (MOX-) based potentiometric pH sensors. The proposed model takes into account the microstructure and crystalline structure of the MOX material. The predicted pH sensitivities are consistent with experimental results with the difference below 6% across three MOX (RuO2, TiO2, and Ta2O5) analysed. The model distinguishes the performance of different MOX phases by the appropriate choice of surface hydroxyl site densities and dielectric constants, making it possible to estimate the performance of MOX electrodes fabricated through different high-temperature and low-temperature annealing methods. It further addresses the problem, cited by theoreticians, of independently determining the C1 inner Helmholtz capacitance parameter while applying the triple-layer model to pH sensors. This is done by varying the C1 capacitance parameter until an invariant pH sensitivity across different electrolyte ionic strengths is obtained. This invariance point identifies the C1 capacitance. The corresponding pH sensitivity is the characteristic sensitivity of MOX. The model has been applied across different types of metal oxides, namely, expensive platinum group oxides (RuO2) and cheaper nonplatinum group MOX (TiO2 and Ta2O5). High temperature annealed, RuO2 produced a high pH sensitivity of 59.1082 mV/pH, while TiO2 and Ta2O5 produced sub-Nernstian sensitivities of 30.0011 and 34.6144 mV/pH, respectively. Low temperature annealed, TiO2 and Ta2O5 produced Nernstian sensitivities of 59.1050 and 59.1081 mV/pH, respectively, illustrating the potential of using cheaper nonplatinum group MOx as alternative sensor electrode materials. Separately, the usefulness of relatively less investigated, cheap, and readily available MOX, viz. Al2O3, as the electrode material was analysed. Low-temperature-annealed Al2O3 with a Nernstian sensitivity of 59.1050 mV/pH can be considered as a potential electrode material. The proposed engineering model can be used as a preliminary prediction mechanism for choosing potentially cheaper alternative sensor electrode materials.

Development of Solid Oxide Electrolyzer Cell (SOEC) Cathode Materials

2012 ◽  
Vol 476-478 ◽  
pp. 1802-1805 ◽  
Author(s):  
Xiao Guo Cao ◽  
Hai Yan Zhang
Keyword(s):  
High Temperature ◽  
Cathode Materials ◽  
Large Scale ◽  
Electrode Materials ◽  
Hydrogen Generation ◽  
Internal Resistance ◽  
Solid Oxide ◽  
High Performing ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis Cells

Hydrogen generation through high temperature solid oxide electrolysis cells (SOEC) has recently received increasingly international interest in the large-scale, highly efficient nuclear hydrogen production field. To achieve cost competitive electrolysis cells that are both high performing i.e. minimum internal resistance of the cell, and long-term stable, it is critical to develop electrode materials that are optimal for steam electrolysis. In this paper, the cathode materials of SOEC are reviewed. Ni-YSZ and Ni-SDC/GDC cermets are promising cathode materials for SOEC working at high temperature. The solid oxide matierials are promising cathode materials for SOEC working in atmospheres with low content of H2,e.g. in smaller scale generators used intermittently without H2 purging. More works, both experimental and theoretical, are needed to further develop SOEC cathode materials.

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