Sulfur Poisoning of the Water Gas Shift Reaction on Anode Supported Solid Oxide Fuel Cells

2012 ◽  
Vol 160 (2) ◽  
pp. F111-F118 ◽  
Author(s):  
Anke Hagen
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Sulfur Poisoning ◽  
Water Gas Shift ◽  
Oxide Fuel ◽  
Water Gas Shift Reaction ◽  
Shift Reaction ◽  
Water Gas

Study of Water Gas Shift Reaction over Ceria Based Catalysts in Solid Oxide Fuel Cells

2015 ◽  
Vol 68 (1) ◽  
pp. 1207-1217 ◽  
Author(s):  
P. Tepamatr ◽  
E. Buarod ◽  
N. Laosiripojana ◽  
S. Charojrochkul
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Water Gas Shift ◽  
Oxide Fuel ◽  
Water Gas Shift Reaction ◽  
Shift Reaction ◽  
Water Gas

Numerical Analysis of the Internal Fuel Processing in Solid Oxide Fuel Cells

2013 ◽  
Author(s):  
Ernesto De La Pena-Cortes ◽  
Francisco Elizalde-Blancas ◽  
Abel Hernandez-Guerrero ◽  
Armando Gallegos-Munoz ◽  
Juan M. Belman-Flores
Keyword(s):  
Chemical Kinetics ◽  
Steam Reforming ◽  
Solid Oxide ◽  
Cell Performance ◽  
Water Gas Shift ◽  
Oxide Fuel ◽  
Water Gas Shift Reaction ◽  
Internal Reforming ◽  
Shift Reaction ◽  
Water Gas

The high operating temperature of a SOFC (solid oxide fuel cell) has several consequences, from which the most important one is the possibility to feed the cell directly with unprocessed fuels. This eliminates the need for expensive external fuel reformers that hinder the cell from achieving a greater overall efficiency when coupled into a power generation system. Direct internal reforming (DIR) takes place directly on the anode of a SOFC by harnessing the available Nickel catalyst on its surface to process the incoming fuel. In this study a three dimensional steady state computational fluid dynamics model is implemented in a planar DIR SOFC to compare the overall cell performance operating on biogas, and coal syngas. Since chemical kinetics plays a significant role in the model accuracy, the present work also focuses on comparing three different chemical reaction mechanisms for the internal reforming process. These include a detailed heterogeneous mechanism consisting of 42 elementary reactions, a global homogeneous catalyzed mechanism, and a Langmuir-Hinshelwood based mechanism. The former includes autothermal reforming, steam reforming and water gas shift reaction effects, the latter two include steam reforming, and water gas shift reaction effects. The analysis yields detailed information about the cell, including polarization curves that help to assess the cell performance for each fuel. Meanwhile the chemical kinetics comparison amongst the analyzed mechanisms helps in establishing the best compromise between the accuracy of the model, and the computational resources devoted for the calculation.

scholarly journals Undoped Sr2MMoO6 Double Perovskite Molybdates (M = Ni, Mg, Fe) as Promising Anode Materials for Solid Oxide Fuel Cells

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1715
Author(s):  
Lubov Skutina ◽  
Elena Filonova ◽  
Dmitry Medvedev ◽  
Antoine Maignan
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Anode Materials ◽  
Functional Materials ◽  
Double Perovskite ◽  
Solid Oxide ◽  
Sulfur Poisoning ◽  
Oxide Fuel ◽  
Fundamental Properties ◽  
Main Emphasis

The chemical design of new functional materials for solid oxide fuel cells (SOFCs) is of great interest as a means for overcoming the disadvantages of traditional materials. Redox stability, carbon deposition and sulfur poisoning of the anodes are positioned as the main processes that result in the degradation of SOFC performance. In this regard, double perovskite molybdates are possible alternatives to conventional Ni-based cermets. The present review provides the fundamental properties of four members: Sr2NiMoO6-δ, Sr2MgMoO6-δ, Sr2FeMoO6-δ and Sr2Fe1.5Mo0.5O6-δ. These properties vary greatly depending on the type and concentration of the 3d-element occupying the B-position of A2BB’O6. The main emphasis is devoted to: (i) the synthesis features of undoped double molybdates, (ii) their electrical conductivity and thermal behaviors in both oxidizing and reducing atmospheres, as well as (iii) their chemical compatibility with respect to other functional SOFC materials and components of gas atmospheres. The information provided can serve as the basis for the design of efficient fuel electrodes prepared from complex oxides with layered structures.

scholarly journals Direct-Hydrocarbon Proton-Conducting Solid Oxide Fuel Cells

2021 ◽  
Vol 13 (9) ◽  
pp. 4736
Author(s):  
Fan Liu ◽  
Chuancheng Duan
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Sulfur Poisoning ◽  
Oxide Fuel ◽  
Power Sources ◽  
Proton Conducting ◽  
Conducting Oxides ◽  
Operating Temperatures ◽  
Ion Conducting

Solid oxide fuel cells (SOFCs) are promising and rugged solid-state power sources that can directly and electrochemically convert the chemical energy into electric power. Direct-hydrocarbon SOFCs eliminate the external reformers; thus, the system is significantly simplified and the capital cost is reduced. SOFCs comprise the cathode, electrolyte, and anode, of which the anode is of paramount importance as its catalytic activity and chemical stability are key to direct-hydrocarbon SOFCs. The conventional SOFC anode is composed of a Ni-based metallic phase that conducts electrons, and an oxygen-ion conducting oxide, such as yttria-stabilized zirconia (YSZ), which exhibits an ionic conductivity of 10−3–10−2 S cm−1 at 700 °C. Although YSZ-based SOFCs are being commercialized, YSZ-Ni anodes are still suffering from carbon deposition (coking) and sulfur poisoning, ensuing performance degradation. Furthermore, the high operating temperatures (>700 °C) also pose challenges to the system compatibility, leading to poor long-term durability. To reduce operating temperatures of SOFCs, intermediate-temperature proton-conducting SOFCs (P-SOFCs) are being developed as alternatives, which give rise to superior power densities, coking and sulfur tolerance, and durability. Due to these advances, there are growing efforts to implement proton-conducting oxides to improve durability of direct-hydrocarbon SOFCs. However, so far, there is no review article that focuses on direct-hydrocarbon P-SOFCs. This concise review aims to first introduce the fundamentals of direct-hydrocarbon P-SOFCs and unique surface properties of proton-conducting oxides, then summarize the most up-to-date achievements as well as current challenges of P-SOFCs. Finally, strategies to overcome those challenges are suggested to advance the development of direct-hydrocarbon SOFCs.

Copper-Based Mixed Oxides Catalyst of Water-Gas Shift Reaction for Fuel Cells: The Role of Alkali Charge

2012 ◽  
Vol 268-270 ◽  
pp. 538-541
Author(s):  
Ke Duan Zhi ◽  
Quan Sheng Liu ◽  
Run Xia He ◽  
Fang Wu ◽  
Ya Gang Zhang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Surface Area ◽  
Mixed Oxides ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Catalyst Structure ◽  
Catalytic Behavior ◽  
Shift Reaction ◽  
Water Gas

The effects of alkali charge on the activity and stability of copper-based mixed oxides catalyst for the water-gas shift reaction (WGSR) were investigated. Activity tests showed that the copper-based mixed oxides catalyst while the 2[NaOH]/[Cu2++Mn2+] is above 1.2 displayed higher activity and better stability than that of others catalysts. The BET , XRD and TPR results revealed that the Cu-Mn catalyst while the 2[NaOH]/[Cu2++Mn2+] is above 1.2 led to higher surface area, a more stable catalyst structure and suitable reduction performance, in turn leading to better catalytic behavior for the Cu-Mn catalyst.

A review of sulfur poisoning of solid oxide fuel cell cathode materials for solid oxide fuel cells

2020 ◽  
Vol 478 ◽  
pp. 228763 ◽  
Author(s):  
Fangfang Wang ◽  
Haruo Kishimoto ◽  
Tomohiro Ishiyama ◽  
Katherine Develos-Bagarinao ◽  
Katsuhiko Yamaji ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide Fuel Cell ◽  
Cathode Materials ◽  
Solid Oxide ◽  
Sulfur Poisoning ◽  
Oxide Fuel ◽  
Fuel Cell Cathode ◽  
Cell Cathode
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