Novel Catalytic Electrodes for High Performance Solid Oxide Fuel Cells Operated at Intermediate Temperatures

2007 ◽  
Vol 336-338 ◽  
pp. 428-433 ◽  
Author(s):  
Bin Zhu ◽  
Xiang Rong Liu ◽  
Ye Cheng ◽  
Mi Lin Zhang
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Power Density ◽  
High Performance ◽  
The Novel ◽  
Composite Electrodes ◽  
Composite Electrolytes ◽  
Coal Gas ◽  
Internal Reforming ◽  
Special Cases ◽  
Novel Catalyst

The all-ceria-composite ITSOFCs have demonstrated extraordinary fuel cell performances since the ceria-composite electrodes are very catalytic and conductive, and the ceria-composite electrolytes are highly conductive and also electrolytic, in addition to excellent compatibility between the electrolyte and electrodes based on the same ceria-based composite materials. The power density outputs from 200 to 800 mWcm-2, were obtained for temperatures between 400 and 700°C. The maximum power density 0.72 Wcm-2 (1500 mAcm-2) at 600°C and 0.82 Wcm-2 (1800 mAcm-2) at 700°C were achieved, respectively. These highly catalytic electrodes functioned extensively for many different fuels, such as hydrogen and hydrocarbon fuels, e.g., natural gas, coal gas, methanol and ethanol etc. In some special cases, the ITSOFCs with the ceria-composite electrodes could also work at as low as 200°C. All these good performances are based on the novel catalyst function of the ceria-composite electrodes and internal reforming mechanism.

scholarly journals Design and Regulation of Novel MnFe2O4@C Nanowires as High Performance Electrode for Supercapacitor

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 777 ◽  
Author(s):  
Lei Geng ◽  
Fengfeng Yan ◽  
Chenhao Dong ◽  
Cuihua An
Keyword(s):  
Energy Density ◽  
Electric Conductivity ◽  
Power Density ◽  
High Performance ◽  
High Specific Capacitance ◽  
The Novel ◽  
Micro Emulsion ◽  
High Electric Conductivity

Bimetallic oxides have been considered as potential candidates for supercapacitors due to their relatively high electric conductivity, abundant redox reactions and cheapness. However, nanoparticle aggregation and huge volume variation during charging-discharging procedures make it hard for them to be applied widely. In this work, one-dimensional (1D) MnFe2O4@C nanowires were in-situ synthesized via a simply modified micro-emulsion technique, followed by thermal treatment. The novel 1D and core-shell architecture, and in-situ carbon coating promote its electric conductivity and porous feature. Due to these advantages, the MnFe2O4@C electrode exhibits a high specific capacitance of 824 F·g−1 at 0.1 A·g−1 and remains 476 F·g−1 at 5 A·g−1. After 10,000 cycles, the capacitance retention of the MnFe2O4@C electrode is up to 93.9%, suggesting its excellent long-term cycling stability. After assembling with activated carbon (AC) to form a MnFe2O4@C//AC device, the energy density of this MnFe2O4@C//AC device is 27 W·h·kg−1 at a power density of 290 W·kg−1, and remains at a 10 W·h·kg−1 energy density at a high power density of 9300 W·kg−1.

A Power Dense Planetary Drive for Rotorcraft Applications

2013 ◽  
Author(s):  
Xiaolan Ai ◽  
Curtis Orkin ◽  
Randy Kruse
Keyword(s):  
Power Density ◽  
High Performance ◽  
Power Flow ◽  
Load Sharing ◽  
Advanced Materials ◽  
The Novel ◽  
Powertrain System ◽  
Planet Gear ◽  
Primary Focus ◽  
Rotary Wing

Increasing power density is an on-going objective for engineers of fixed wing and rotary wing aircraft. The powertrain system is one of the largest contributors to the total mass of the aircraft and the geartrain is the largest contributor to the mass of the powertrain system. As such, the geartrain becomes the primary focus of many power density studies and is the focus of this paper. Epicyclic geartrains are known to provide high power density and have become the geartrain of choice for the main power flow in virtually all aircraft designs. This paper presents a unique compound planetary design targeting a helicopter main gearbox transmission application. The design significantly improves power density through its innovative planet gear load-sharing configuration along with the utilization of high-performance materials for gears and bearings. Design studies were conducted comparing the power density of this new design to a baseline gearbox design. The results of these studies demonstrate an estimated 38% power density improvement over the baseline configuration. Of the total improvement, 86% is attributed to the novel load-sharing configuration while 14% is attributed to utilization of advanced materials and processes.

Nano-film coated cathode functional layers towards high performance solid oxide fuel cells

2018 ◽  
Vol 6 (25) ◽  
pp. 11811-11818 ◽  
Author(s):  
Mingi Choi ◽  
Jongseo Lee ◽  
Wonyoung Lee
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
High Performance ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Composite Electrodes ◽  
Phase Boundaries ◽  
Infiltration Process

Nano-structured composite electrodes, from a carefully conducted infiltration process, are one of the most promising electrode structures for intermediate temperature solid oxide fuel cells (IT-SOFCs), due to their ability to promote the oxygen reduction reaction (ORR) and enlarge triple phase boundaries (TPBs).

Effect of the Microstructure of Porous Composite Electrodes on the Electric Power Density of Solid Oxide Fuel Cells

2011 ◽  
Author(s):  
Siamak Farhad ◽  
Feridun Hamdullahpur
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Electric Power ◽  
Power Density ◽  
Average Power ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Composite Electrodes ◽  
Porous Composite ◽  
Macro Model

The electric power density generated in co-flow planar solid oxide fuel cells (SOFCs) with porous composite electrodes is predicted using the cell combined micro- macro-model; and the effect of the microstructural variables of the electrodes on the cell power generation is studied. In the combined micro- macro-model, the electrochemical performance of the porous composite electrodes is determined from the micro-model and the distributions of the temperature in solid structure of the cell and the temperature and species partial pressures of the bulk fuel and air streams are determined from the cell macro-model. As a case study, the effect of the microstructural variables of the porous composite electrodes of the Ni-YSZ/YSZ/LSM-YSZ cell operated at the given voltage, fuel utilization ratio, and excess air, on the average power density of the cell is investigated through computer simulation. The results reveal that there is an optimum value for each microstructural variables of the electrodes at which the cell power density is maximized.

A High Ratio Power Dense Planetary Drive for Rotorcraft Applications

2013 ◽  
Vol 136 (2) ◽  
Author(s):  
Xiaolan Ai ◽  
Curtis Orkin ◽  
Randy Kruse
Keyword(s):  
Power Density ◽  
High Performance ◽  
Power Flow ◽  
Load Sharing ◽  
High Ratio ◽  
Advanced Materials ◽  
The Novel ◽  
Design Studies ◽  
Planet Gear ◽  
Unique Compound

Epicyclic geartrains are known to provide high power density and have become the geartrain of choice for the main power flow in virtually all rotorcraft designs. This paper presents a unique compound planetary design targeting a helicopter main gearbox transmission application. The design significantly improves power density over conventional geartrains through its innovative planet gear load-sharing configuration along with the utilization of high-performance materials for gears and bearings. Design studies were conducted comparing the power density of this new design to a baseline gearbox design. The results of these studies demonstrate an estimated 38% power density improvement over the baseline configuration. Of the total improvement, 86% is attributed to the novel load-sharing configuration while 14% is attributed to utilization of advanced materials and processes.

scholarly journals An Alternative Heterogeneous Catalyst Synthesis From Seabass (Dicentrarchus Labrax) Scales for Biodiesel Production

2021 ◽  
Author(s):  
Gediz UĞUZ ◽  
Muntadher Musafer Obaid Alwahidhawi
Keyword(s):  
Heterogeneous Catalyst ◽  
High Performance ◽  
Renewable Energy Sources ◽  
Dicentrarchus Labrax ◽  
Biodiesel Production ◽  
Fish Scale ◽  
The Novel ◽  
Fish Scales ◽  
Catalyst Synthesis ◽  
Novel Catalyst

Abstract Biodiesel is one of the renewable energy sources derived from living organisms and is an alternative to petroleum fuels that cause environmental pollution. Biodiesel is specified as the fatty acid alkyl esters (FAAE) formed as a result of the transesterification reactions of various alcohols and triglycerides with catalysts. The catalyst plays an important role in biodiesel production. These catalysts can be synthesized from chemical or natural substances as homogeneous or heterogeneous. Some natural waste materials such as egg shell and fish scales have started to be preferred in catalyst synthesis due to their low cost, accessibility and support for waste recycling and minimizing. In this study, a high-performance heterogeneous catalyst was synthesized in order to reduce cost, increase the reaction rate and evaluate waste fish scales in biodiesel production. Waste fish scales were characterized by Thermogravimetric Analysis (TGA). The novel catalyst was prepared from waste Seabass (Dicentrarchus Labrax) fish scales by calcination at different temperatures (800, 900, 950 and 1000 °C). The best calcination temperature was determined by using as X-Ray Diffraction (XRD) techniques as 1000 °C and the waste fish scale catalyst was shortened as WFSC. The novel WFSC was characterized by BET specific surface area, Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR). Finally, the novel WFSC were used for biodiesel production. Biodiesel yield was calculated as 85 %. Additionally, this novel catalyst reduces chemical consumption in biodiesel production, with its reusability. Due to the obtained results, it can be qualified as an eco-friendly catalyst.

Sign in / Sign up

Export Citation Format

Share Document