38. R&amp;D on hydrogen production by high-temperature electrolysis of steam

Hino, Ryutaro; Haga, Katsuhiro; Aita, Hideki; Sekita, Kenji

doi:10.1016/j.nucengdes.2004.08.029

Cited by 130 publications

(73 citation statements)

References 6 publications

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“…The details of the cell dimensions and test conditions are summarized in Tab. 1 [5,[21][22][23][24][25]. As expected, the experimental results revealed that the hydrogen production increased with increasing applied cell potential, as shown in Fig.…”

Section: Model Validationsupporting

confidence: 62%

Modeling of Electrochemistry and Heat/Mass Transfer in a Tubular Solid Oxide Steam Electrolyzer for Hydrogen Production

Leung

2008

Chem Eng & Technol

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A finite-volume based mathematical model has been developed for modeling hydrogen production by a tubular cell of solid oxide steam electrolyzer (SOSE), taking into account the electrochemical reactions and heat/mass transfer effects. The model is composed of three systems of nonlinear equations that govern the electric current density, energy balance in the solid SOSE cell, and energy balance in the flow of steam and hydrogen. The simulated hydrogen production rate proportional to the applied potential agreed well with the experimental measurements published in the literature. The intermediate modeling results indicated that the activation effect dominate the overall cell overpotential due to low exchange current density through the SOSE cell electrodes. Thus, higher electrode activity was identified as an important factor for enhancing cell performance. Parametric modeling analyses were conducted to gain better understanding of the SOSE characteristics. It was found that low-temperature gas intake would cause a high temperature gradient in the tubular cell material at the inlet, possibly leading to a thermal expansion problem. The risk could be reduced by increasing the gas inlet temperature. It was also found that energy-efficient SOSE hydrogen production can be achieved by reducing the hydrogen content in the steam intake and regulating the steam intake flow rate to an optimum that minimizes the overall electrical and thermal requirements. More parametric modeling results are discussed in this paper. The tubular SOSE cell model developed in this study can easily be expanded to accomplish tubular SOSE stack analysis for comprehensive system design optimization.

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Section: Model Validationsupporting

confidence: 62%

Modeling of Electrochemistry and Heat/Mass Transfer in a Tubular Solid Oxide Steam Electrolyzer for Hydrogen Production

Leung

2008

Chem Eng & Technol

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“…High temperature electrolysis of steam (HTES) uses a combination of thermal energy and electricity to split water. From a thermodynamics and kinetics standpoint, the high temperatures can make activation over-potentials lower and increase the mobility of the oxygen ion [2,[14][15][16]. A feasible combined system efficiency of 46% at 850_C for HTES has been calculated previously [14].…”

Section: Hydrogen/syngas Production Optionsmentioning

confidence: 99%

Solid oxide electrochemical reactor science.

Sullivan

Stechel²,

Moyer

et al. 2010

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This LDRD involved a collaboration between Sandia and the Colorado School of Mines (CSM) ins solid-oxide electrochemical reactors targeted at solid oxide electrolyzer cells (SOEC), which are the reverse of solid-oxide fuel cells (SOFC). SOECs complement Sandia's efforts in thermochemical production of alternative fuels. An SOEC technology would co-electrolyze carbon dioxide (CO 2 ) with steam at temperatures around 800 ºC to form synthesis gas (H 2 and CO), which forms the building blocks for a petrochemical substitutes that can be used to power vehicles or in distributed energy platforms. The effort described here concentrates on research concerning catalytic chemistry, charge-transfer chemistry, and optimal cell-architecture. technical scope included computational modeling, materials development, and experimental evaluation. The project engaged the Colorado Fuel Cell Center at CSM through the support of a graduate student (Connor Moyer) at CSM and his advisors (Profs. Robert Kee and Neal Sullivan) in collaboration with Sandia. 4 ACKNOWLEDGMENTSThis report is based largely upon the thesis written by Connor Moyer for his degree of Master of Science (Engineering) at Colorado School of Mines, which this LDRD helped fund. This project also leveraged modeling results from Dr. Huayang Zhu at Colorado School of Mines, who was primarily funded by the Office of Naval Research via an RTC grant (N00014-05-1-03339).5

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“…Although the single cells of an SOEC stack can be in either a tubular configuration or planar configuration, planar cell structures are most commonly used for SOECs due to their lower manufacturing cost, higher packing density, and significantly smaller hot volume in the system compared to tubular designs [7,8]. The planar design also allows for shorter current paths, reducing the Ohmic resistance within the cell [9].…”

mentioning

confidence: 99%

The Effects of Operating Conditions on the Performance of a Solid Oxide Steam Electrolyser: A Model‐Based Study

et al. 2010

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. The effects of operating conditions on the performance of a solid oxide steam electrolyser: a model-based study. Fuel Cells, Wiley-VCH Verlag, 2010, 10 (6) AbstractTo support the development of hydrogen production by high temperature electrolysis using solid oxide electrolysis cells (SOECs), the effects of operating conditions on the performance of the SOECs were investigated using a one-dimensional model of a cathode-supported planar SOEC stack. Among all the operating parameters, temperature is the most influential factor on the performance of an SOEC, in both cell voltage and operation mode (i.e. endothermic, thermoneutral and exothermic). temperature of the cathode and anode gas streams, solid structure and interconnect (K)

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38. R&D on hydrogen production by high-temperature electrolysis of steam

Cited by 130 publications

References 6 publications

Modeling of Electrochemistry and Heat/Mass Transfer in a Tubular Solid Oxide Steam Electrolyzer for Hydrogen Production

Modeling of Electrochemistry and Heat/Mass Transfer in a Tubular Solid Oxide Steam Electrolyzer for Hydrogen Production

Solid oxide electrochemical reactor science.

The Effects of Operating Conditions on the Performance of a Solid Oxide Steam Electrolyser: A Model‐Based Study

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