Syngas production by high temperature steam/CO2 coelectrolysis using solid oxide electrolysis cells

2015 ◽  
Vol 182 ◽  
pp. 341-351 ◽  
Author(s):  
Xinbing Chen ◽  
Chengzhi Guan ◽  
Guoping Xiao ◽  
Xianlong Du ◽  
Jian-Qiang Wang
Keyword(s):  
High Temperature ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Syngas Production ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Comparable Performance ◽  
High Temperature Steam ◽  
Shift Reaction ◽  
Solid Oxide Electrolysis Cells

High temperature (HT) steam/CO2 coelectrolysis with solid oxide electrolysis cells (SOECs) using the electricity and heat generated from clean energies is an important alternative for syngas production without fossil fuel consumption and greenhouse gas emissions. Herein, reaction characteristics and the outlet syngas composition of HT steam/CO2 coelectrolysis under different operating conditions, including distinct inlet gas compositions and electrolysis current densities, are systematically studied at 800 °C using commercially available SOECs. The HT coelectrolysis process, which has comparable performance to HT steam electrolysis, is more active than the HT CO2 electrolysis process, indicating the important contribution of the reverse water-gas shift reaction in the formation of CO. The outlet syngas composition from HT steam/CO2 coelectrolysis is very sensitive to the operating conditions, indicating the feasibility of controlling the syngas composition by varying these conditions. Maximum steam and CO2 utilizations of 77% and 76% are achieved at 1.0 A cm−2 with an inlet gas composition of 20% H2/40% steam/40% CO2.

scholarly journals Development of high-temperature electrochemical TEM and its application on solid oxide electrolysis cells

2021 ◽  
Vol 27 (S1) ◽  
pp. 3138-3139
Author(s):  
Søren Bredmose Simonsen ◽  
Waynah Lou Dacayan ◽  
Zhongtao Ma ◽  
Christodoulos Chatzichristodoulou ◽  
Wenjing Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Solid Oxide ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells

Electrochemical Performance of Ni-YSZ, Ni/Ru-GDC, LSM-YSZ, LSCF and LSF Electrodes for Solid Oxide Electrolysis Cells

2010 ◽  
Author(s):  
P. Kim-Lohsoontorn ◽  
H.-B. Yim ◽  
J.-M. Bae
Keyword(s):  
Electrochemical Performance ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Hydrogen Electrode ◽  
Anodic Reaction ◽  
Oxygen Electrodes ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells ◽  
Electrolysis Mode

The electrochemical performance of solid oxide electrolysis cells (SOECs) having nickel – yttria stabilized zirconia (Ni-YSZ) hydrogen electrode and a composite lanthanum strontium manganite – YSZ (La0.8Sr0.2MnO3−δ – YSZ) oxygen electrodes has been studied over a range of operating conditions temperature (700 to 900°C). Increasing temperature significantly increased electrochemical performance and hydrogen generation efficiency. Durability studies of the cell in electrolysis mode were made over 200 h periods (0.1 A/cm2, 800°C, and H2O/H2 = 70/30). The cell significantly degraded over the time (2.5 mV/h). Overpotentials of various SOEC electrodes were evaluated. Ni-YSZ as a hydrogen electrode exhibited higher activity in SOFC mode than SOEC mode while Ni/Ru-GDC presented symmetrical behavior between fuel cell and electrolysis mode and gave lower losses when compared to the Ni-YSZ electrode. All the oxygen electrodes gave higher activity for the cathodic reaction than the anodic reaction. Among the oxygen electrodes in this study, LSM-YSZ exhibited nearest to symmetrical behavior between cathodic and anodic reaction. Durability studies of the electrodes in electrolysis mode were made over 20–70 h periods. Performance degradations of the oxygen electrodes were observed (3.4, 12.6 and 17.6 mV/h for LSM-YSZ, LSCF and LSF, respectively). The Ni-YSZ hydrogen electrode exhibited rather stable performance while the performance of Ni/Ru-GDC decreased (3.4 mV/h) over the time. This was likely a result of the reduction of ceria component at high operating voltage.

scholarly journals Performance and Durability of Solid Oxide Electrolysis Cells for Syngas Production

2019 ◽  
Vol 41 (33) ◽  
pp. 77-85 ◽  
Author(s):  
Xiufu Sun ◽  
Ming Chen ◽  
Per Hjalmarsson ◽  
Sune Dalgaard Ebbesen ◽  
So̸ren Ho̸jgaard Jensen ◽  
...  
Keyword(s):  
Solid Oxide ◽  
Syngas Production ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells

3-Dimensional Numerical Analysis of Solid Oxide Electrolysis Cells (SOEC) Steam Electrolysis Operation for Hydrogen Production

2014 ◽  
Author(s):  
Juhyun Kang ◽  
Joonguen Park ◽  
Joongmyeon Bae
Keyword(s):  
Simulation Model ◽  
Electrical Energy ◽  
High Energy ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Governing Equations ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells ◽  
The Relationship

Hydrogen is a resource that provides energy and forms water only after reacting with oxygen. Because there are no emissions such as greenhouse gases when hydrogen is converted to produce energy, it is considered one of the most important energy resources for addressing the problems of global warming and air pollution. Additionally, hydrogen can be useful for constructing “smart grid” infrastructure because electrical energy from other renewable energy sources can be stored in the form of chemical energy by electrolyzing water, creating hydrogen. Among the many hydrogen generation systems, solid oxide electrolysis cells (SOECs) have attracted considerable attention as advanced water electrolysis systems because of their high energy conversion efficiency and low use of electrical energy. To find the relationship between operating conditions and the performance of SOECs, research has been conducted both experimentally, using actual SOEC cells, and numerically, using computational fluid dynamics (CFD). In this investigation, we developed a 3-D simulation model to analyze the relationship between the operating conditions and the overall behavior of SOECs due to different contributions to the over-potential. All SOECs involve the transfer of mass, momentum, species, and energy, and these properties are correlated. Furthermore, all of these properties have a direct influence on the concentration of the gases in the electrodes, the pressure, the temperature and the current density. Therefore, the conservation equations for mass, momentum, species, and energy should be included in the simulation model to calculate all terms in the transfer of mass, heat and fluid. In this simulation model, the transient term was neglected because the steady state was assumed. All governing equations were calculated using Star-CD (CD Adapco, U.S). The source terms in the governing equations were calculated with in-house code, i.e., user defined functions (UDF), written in FORTRAN 77, and these were linked to the Star-CD solver to calculate the transfer processes. Simulations were performed with various cathode inlet gas compositions, anode inlet gas compositions, cathode thickness, and electrode porosity to identify the main parameters related to performance.

Performance and Stability of High Temperature Solid Oxide Electrolysis Cells (SOECs) for Hydrogen Production

2013 ◽  
Vol 57 (1) ◽  
pp. 3099-3104 ◽  
Author(s):  
K. J. Yoon ◽  
J.-W. Son ◽  
J.-H. Lee ◽  
B.-K. Kim ◽  
H.-J. Je ◽  
...  
Keyword(s):  
High Temperature ◽  
Hydrogen Production ◽  
Solid Oxide ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells

Co-electrolysis of steam and CO2 in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas

2015 ◽  
Vol 182 ◽  
pp. 241-255 ◽  
Author(s):  
M. Torrell ◽  
S. García-Rodríguez ◽  
A. Morata ◽  
G. Penelas ◽  
A. Tarancón
Keyword(s):  
Electrochemical Impedance ◽  
Oxygen Electrode ◽  
Metallic Phase ◽  
Solid Oxide ◽  
Density Currents ◽  
Ceramic Oxides ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Shift Reaction ◽  
Solid Oxide Electrolysis Cells

The use of cermets as fuel electrodes for solid oxide electrolysis cells requires permanent circulation of reducing gas, e.g. H2 or CO, so called safe gas, in order to avoid oxidation of the metallic phase. Replacing metallic based electrodes by pure oxides is therefore proposed as an advantage for the industrial application of solid oxide electrolyzers. In this work, full-ceramic symmetrical solid oxide electrolysis cells have been investigated for steam/CO2 co-electrolysis. Electrolyte supported cells with La0.75Sr0.25Cr0.5Mn0.5O3−δ reversible electrodes have been fabricated and tested in co-electrolysis mode using different fuel compositions, from pure H2O to pure CO2, at temperatures between 850–900 °C. Electrochemical impedance spectroscopy and galvanostatic measurements have been carried out for the mechanistic understanding of the symmetrical cell performance. The content of H2 and CO in the product gas has been measured by in-line gas micro-chromatography. The effect of employing H2 as a safe gas has also been investigated. Maximum density currents of 750 mA cm−2 and 620 mA cm−2 have been applied at 1.7 V for pure H2O and for H2O : CO2 ratios of 1 : 1, respectively. Remarkable results were obtained for hydrogen-free fuel compositions, which confirmed the interest of using ceramic oxides as a fuel electrode candidate to reduce or completely avoid the use of safe gas in operation minimizing the contribution of the reverse water shift reaction (RWSR) in the process. H2 : CO ratios close to two were obtained for hydrogen-free tests fulfilling the basic requirements for synthetic fuel production. An important increase in the operation voltage was detected under continuous operation leading to a dramatic failure by delaminating of the oxygen electrode.

High-temperature electrolysis of simulated flue gas in solid oxide electrolysis cells

2018 ◽  
Vol 280 ◽  
pp. 206-215 ◽  
Author(s):  
Yifeng Zheng ◽  
Juan Zhou ◽  
Lan Zhang ◽  
Qinglin Liu ◽  
Zehua Pan ◽  
...  
Keyword(s):  
High Temperature ◽  
Flue Gas ◽  
Solid Oxide ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells ◽  
High Temperature Electrolysis
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