Cathode Supported Honeycomb SOFCs for Intermediate Temperature Operation

2009 ◽  
Author(s):  
Sota Shimizu ◽  
Toshiaki Yamaguchi ◽  
Yoshinobu Fujishiro ◽  
Masanobu Awano
Keyword(s):  
Evaluation Method ◽  
Open Circuit Voltage ◽  
Current Collector ◽  
Open Circuit ◽  
Intermediate Temperature ◽  
Anode Current ◽  
Power Module ◽  
Electrical Simulation ◽  
Start Up ◽  
Electrochemical Evaluation

A novel cathode supported honeycomb SOFC for intermediate temperature operation has been developed for application as a compact power module with quick start-up and shut-down functions. In this study, effects of resistances of glass sealant and anode current collector formed on the edge face of the honeycomb on the SOFC performance was investigated using an electrical simulation and a practical electrochemical evaluation method. Open circuit voltage (OCV) for a honeycomb SOFC unit was improved with an increase in the resistance glass sealant or a decrease in anode current collector. The fabricated honeycomb SOFC showed the OCV values above 1.05 V in a temperature range of 500 to 600 °C.

Evaluation of Li-Mg-B Alloy Anode for Intermediate Temperature Lithium Batteries

2011 ◽  
Vol 287-290 ◽  
pp. 1553-1558 ◽  
Author(s):  
Zhen Jie Wang ◽  
Yong Qiang Niu ◽  
Jun Lin Du ◽  
Nai Xin Xu ◽  
Zhu Wu
Keyword(s):  
Lithium Batteries ◽  
Phase Structure ◽  
Open Circuit Voltage ◽  
Weight Percent ◽  
Open Circuit ◽  
Intermediate Temperature ◽  
Alloy Anode ◽  
Capacity Loss ◽  
Discharge Behavior ◽  
The Cost

A ternary Li-Mg-B alloy (64%Li, 4%Mg and 32%B, all compositions are reported as weight percent in this paper) foil was prepared and its phase structure and discharge behavior were investigated. The main phases existing in the alloy included Li5B4, Li3Mg7, LiB and Li. Coupled with LiNO3-KNO3eutectic electrolyte and MnO2cathode, the anode exhibited great potential in the intermediate temperature lithium batteries. At temperatures above 200°C, two steady voltage plateaus were obtained at near 3V and 2.7V, and the cell displayed an open-circuit voltage exceeding 3.2V. The experimentally measured capacity of the Li-Mg-B alloy was 5427C·g-1at 200°C, which was higher than that of LiB alloy (70%Li). Adding magnesium to LiB alloy could lower the cost of anodes without capacity loss.

Self-Discharge Behavior of Lithium/Sulfur Battery Using Aluminum Current Collector

2005 ◽  
Vol 486-487 ◽  
pp. 630-633 ◽  
Author(s):  
Ho Suk Ryu ◽  
Hyo Jun Ahn
Keyword(s):  
Room Temperature ◽  
Elemental Sulfur ◽  
Open Circuit Voltage ◽  
Current Collector ◽  
Open Circuit ◽  
The Self ◽  
Discharge Behavior ◽  
Sulfur Battery ◽  
Sulfur Electrode ◽  
Lithium Sulfur

We investigated the self discharge behavior of lithium/sulfur cell using an alumium current collector. The discharge capacity decreased by 14% for oriniginal one after 30 days’ storage at room temperature. The open circuit voltage(OCV) of Li/S battery gradually decreased from 2.45V to 2.38V during the 30 days. The self discharge behavior was related to the decrease of elemental sulfur in the sulfur electrode.

scholarly journals A Fully Integrated AC-DC Converter in 1 V CMOS for Electrostatic Vibration Energy Transducer with an Open Circuit Voltage of 10 V

Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1185
Author(s):  
Yosuke Ishida ◽  
Toru Tanzawa
Keyword(s):  
Open Circuit Voltage ◽  
Open Circuit ◽  
Vibration Energy ◽  
Bandgap Reference ◽  
Vibration Energy Harvesting ◽  
Silicon Area ◽  
Fully Integrated ◽  
Start Up ◽  
Bridge Rectifier ◽  
Energy Transducer

This paper proposes an AC-DC converter for electrostatic vibration energy harvesting. The converter is composed of a CMOS full bridge rectifier and a CMOS shunt regulator. Even with 1 V CMOS, the open circuit voltage of the energy transducer can be as high as 10 V and beyond. Bandgap reference (BGR) inputs a regulated voltage, which is controlled by the output voltage of the BGR. Built-in power-on reset is introduced, which can minimize the silicon area and power to function normally found upon start-up. The AC-DC converter was fabricated with a 65 nm low-Vt 1 V CMOS with 0.081 mm2. 1 V regulation was measured successfully at 20–70 °C with a power conversion efficiency of 43%.

scholarly journals Optimization of the Electrolyte Parameters and Components in Zinc Particle Fuel Cells

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1090 ◽  
Author(s):  
Thangavel Sangeetha ◽  
Po-Tuan Chen ◽  
Wu-Fu Cheng ◽  
Wei-Mon Yan ◽  
K. Huang
Keyword(s):  
Fuel Cells ◽  
Flow Velocity ◽  
Potassium Hydroxide ◽  
Current Collector ◽  
Open Circuit ◽  
Copper Plate ◽  
Anode Current ◽  
Power Performance ◽  
Operational Parameters ◽  
Zinc Particle

Zinc (Zn)-air fuel cells (ZAFC) are a widely-acknowledged type of metal air fuel cells, but optimization of several operational parameters and components will facilitate enhanced power performance. This research study has been focused on the investigation of ZAFC Zn particle fuel with flowing potassium hydroxide (KOH) electrolyte. Parameters like optimum electrolyte concentration, temperature, and flow velocity were optimized. Moreover, ZAFC components like anode current collector and cathode conductor material were varied and the appropriate materials were designated. Power performance was analyzed in terms of open circuit voltage (OCV), power, and current density production and were used to justify the results of the study. The flow rate of the electrolyte was determined as 150 mL/min in the self-designed configuration. KOH electrolyte of 40 wt% concentration, at a temperature of 55 to 65 ℃, and with a flow velocity of 0.12 m/s was considered to be beneficial for the ZAFCs operated in this study. Nickel mesh with a surface area of 400 cm2 was chosen as anode current collector and copper plate was considered as cathode conductor material in the fuel cells designed and operated in this study. The power production of this study was better compared to some previously published works. Thus, effective enhancement and upgrading process of the ZAFCs will definitely provide great opportunities for their applications in the future.

Effects of mixed conduction on the open-circuit voltage of intermediate-temperature SOFCs based on Sm-doped ceria electrolytes

2005 ◽  
Vol 176 (7-8) ◽  
pp. 663-668 ◽  
Author(s):  
Toshiaki Matsui ◽  
Takuya Kosaka ◽  
Minoru Inaba ◽  
Atsushi Mineshige ◽  
Zempachi Ogumi
Keyword(s):  
Open Circuit Voltage ◽  
Open Circuit ◽  
Intermediate Temperature ◽  
Doped Ceria ◽  
Mixed Conduction

Microcrystalline (Si,Ge):H Solar Cells

2003 ◽  
Vol 762 ◽  
Author(s):  
Jianhua Zhu ◽  
Vikram L. Dalal
Keyword(s):  
Solar Cells ◽  
Buffer Layer ◽  
Quantum Efficiency ◽  
Fill Factor ◽  
Open Circuit Voltage ◽  
Defect Density ◽  
Cell Structure ◽  
Open Circuit ◽  
Base Layer ◽  
Ecr Plasma

AbstractWe report on the growth and properties of microcrystalline Si:H and (Si,Ge):H solar cells on stainless steel substrates. The solar cells were grown using a remote, low pressure ECR plasma system. In order to crystallize (Si,Ge), much higher hydrogen dilution (∼40:1) had to be used compared to the case for mc-Si:H, where a dilution of 10:1 was adequate for crystallization. The solar cell structure was of the p+nn+ type, with light entering the p+ layer. It was found that it was advantageous to use a thin a-Si:H buffer layer at the back of the cells in order to reduce shunt density and improve the performance of the cells. A graded gap buffer layer was used at the p+n interface so as to improve the open-circuit voltage and fill factor. The open circuit voltage and fill factor decreased as the Ge content increased. Quantum efficiency measurements indicated that the device was indeed microcrystalline and followed the absorption characteristics of crystalline ( Si,Ge). As the Ge content increased, quantum efficiency in the infrared increased. X-ray measurements of films indicated grain sizes of ∼ 10nm. EDAX measurements were used to measure the Ge content in the films and devices. Capacitance measurements at low frequencies ( ~100 Hz and 1 kHz) indicated that the base layer was indeed behaving as a crystalline material, with classical C(V) curves. The defect density varied between 1x1016 to 2x1017/cm3, with higher defects indicated as the Ge concentration increased.

Reducing recombination and enhancing open circuit voltage by Strontium-alloying in multiple cation perovskite solar cells

2017 ◽  
Author(s):  
Pietro Caprioglio ◽  
Fengshuo Zu ◽  
Christian M. Wolff ◽  
Martin Stolterfhot ◽  
Norbert Koch ◽  
...  
Keyword(s):  
Solar Cells ◽  
Open Circuit Voltage ◽  
Perovskite Solar Cells ◽  
Open Circuit
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