Theoretical Calculation of the Electrical Potential at the Electrode/Electrolyte Interfaces of Solid Oxide Fuel Cells

2005 ◽  
Vol 2 (4) ◽  
pp. 238-245 ◽  
Author(s):  
Ismail Celik ◽  
S. Raju Pakalapati ◽  
Maria D. Salazar-Villalpando
Keyword(s):  
Free Energy ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Electrical Potential ◽  
Solid Oxide ◽  
Ion Concentration ◽  
Oxide Fuel ◽  
Oxygen Ion ◽  
Proposed Model ◽  
Semi Empirical

A new semi-empirical model is formulated to calculate the potential differences at the cathode/electrolyte and electrolyte/anode interfaces separately for solid oxide fuel cells. The new model is based on a reduced reaction mechanism, and it accounts for the oxygen ion concentration at these interfaces. The model also considers the Gibbs free energy for the two electrode interfaces seperately. Results from case studies demonstrate the great potential of the proposed model

Efficiency Evaluation of Solid-Oxide Fuel Cells in Combined Cycle Operations

2009 ◽  
Vol 6 (2) ◽  
Author(s):  
C. M. Colson ◽  
M. H. Nehrir ◽  
M. C. Deibert ◽  
M. R. Amin ◽  
C. Wang
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
High Efficiency ◽  
Combined Cycle ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Modeling Simulation ◽  
Semi Empirical ◽  
Energy Conversion Devices ◽  
Capacity Method

Solid oxide fuel cells (SOFCs) are high-temperature, high-efficiency, combustionless electrochemical energy conversion devices that have potential for combined cycle applications. This paper intends to clarify and expand the efficiency discussions related to SOFC when operating in combined cycle (CC) systems. A brief analysis of the first and second thermodynamic laws is conducted and, building upon a previously developed SOFC dynamic model, operating fuel heating values are determined by utilizing the semi-empirical gas phase heat capacity method. As a result, accurate SOFC stack operational simulations are conducted to calculate its efficiency based on actual thermodynamic parameters. Furthermore, an analysis is conducted of a combined SOFC-CC system using dynamic modeling. Simulation results are given, which are intended to aid researchers in evaluating hybrid SOFC-CC generation systems.

Performance of ethanol-fuelled solid oxide fuel cells: Proton and oxygen ion conductors

2007 ◽  
Vol 133 (1-3) ◽  
pp. 187-194 ◽  
Author(s):  
W. Jamsak ◽  
S. Assabumrungrat ◽  
P.L. Douglas ◽  
N. Laosiripojana ◽  
R. Suwanwarangkul ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Oxygen Ion ◽  
Oxygen Ion Conductors ◽  
Ion Conductors

scholarly journals A first-principles study on divergent reactions of using a Sr3Fe2O7 cathode in both oxygen ion conducting and proton conducting solid oxide fuel cells

RSC Advances ◽  
2018 ◽  
Vol 8 (47) ◽  
pp. 26448-26460 ◽  
Author(s):  
Wenzhou Tan ◽  
Daoming Huan ◽  
Wenqiang Yang ◽  
Nai Shi ◽  
Wanhua Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
First Principles ◽  
Solid Oxide ◽  
Atomic Scale ◽  
Oxide Fuel ◽  
Proton Conducting ◽  
Oxygen Ion ◽  
Ion Conducting ◽  
Working Mechanisms

The different working mechanisms for one cathode performing in both O- and P-SOFCs on the atomic scale.

Applicability of Gd0.9Ca0.1AlO3-δ Ceramic Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells

2012 ◽  
Vol 476-478 ◽  
pp. 1785-1789 ◽  
Author(s):  
Gui Hua Liu ◽  
Fang Wang ◽  
Rui Qiang Yan
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Pure Oxygen ◽  
Electrode Polarization ◽  
Oxide Fuel ◽  
Ceramic Electrolyte ◽  
Oxygen Ion

In this paper, the applicability of Gd0.9Ca0.1AlO3-δ (GCAO) oxygen-ion conductor as ceramic electrolyte for intermediate temperature solid oxide fuel cells (SOFCs) was systematically investigated. XRD and TGA results demonstrate that GCAO material is in possession of sufficient structural stability from low to high temperature, desirable chemical stability against humidified reducing atmosphere and fine high-temperature thermal stability in air. Thermal shrinkage research during high temperature sintering shows that complete sintering of pressed green GCAO disk is around 1500 oC and the corresponding thermal expansion coefficient of sintered GCAO is 9.2×10-6 K-1 from room temperature to 1000 oC. In addition, total conductivity of GCAO ranges from 0.00073 to 0.0081 S•cm-1 in air as function of temperature increasing from 600 to 800 oC where the corresponding activation energy is determined as 96.19 KJ•mol-1. A 2-mm-thick electrolyte-supported single fuel cell was prepared with La0.8Sr0.2TiO3-δ/Ce0.8Gd0.2O2-δ and La0.8Sr0.2MnO3-δ/Ce0.8Gd0.2O2-δ as anode and cathode, and tested at 800 oC with humidified hydrogen and static air as fuel and oxidizer, respectively. The OCV reaches as high as 1.1 V which prove the pure oxygen-ion conduction of GCAO; and the corresponding maximum output and electrode polarization resistance reach 42 mW/cm2 and 0.15 Ώcm2, respectively. In summary, GCAO could be a possible electrolyte candidate for intermediate temperature SOFCs.

Ceria-based nanocomposite with simultaneous proton and oxygen ion conductivity for low-temperature solid oxide fuel cells

2011 ◽  
Vol 196 (5) ◽  
pp. 2754-2758 ◽  
Author(s):  
Xiaodi Wang ◽  
Ying Ma ◽  
Shanghua Li ◽  
Abdel-Hady Kashyout ◽  
Bin Zhu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Ion Conductivity ◽  
Oxide Fuel ◽  
Oxygen Ion Conductivity ◽  
Oxygen Ion
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