Can high temperature steam electrolysis function with geothermal heat?

Sigurvinsson, J.; Mansilla, Christine; Lovera, Patrick; Werkoff, F.

doi:10.1016/j.ijhydene.2006.11.026

Cited by 112 publications

(64 citation statements)

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“…1,4 Based on the results shown in this article, the requirement of a lifetime of at least 10 years seems to be fulfilled, even though this must be demonstrated over a much longer period. The developed gas cleaning process is relatively cheap, and the economic impact on the entire system is only minor.…”

Section: Resultsmentioning

confidence: 92%

“…Solid oxide electrolysis cells ͑SOECs͒ have the potential for cost-competitive production of hydrogen [1][2][3][4] and carbon monoxide, 1 providing lifetimes of the SOECs exceeding 5-10 years. 1,4 However, the state-of-the-art cells, which possess the necessary high performance, degrade rapidly during electrolysis operation.…”

mentioning

confidence: 99%

“…1,4 However, the state-of-the-art cells, which possess the necessary high performance, degrade rapidly during electrolysis operation. [5][6][7][8][9][10][11][12][13] This degradation prohibits the realization of cheap production of hydrogen and carbon monoxide via high temperature electrolysis.…”

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confidence: 99%

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Exceptional Durability of Solid Oxide Cells

Ebbesen¹,

Mogensen²

2010

Electrochem. Solid-State Lett.

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Extensive efforts to resolve the degradation normally associated with solid oxide electrolysis cells ͑SOECs͒ have been conducted during the past decade. To date, the degradation is assumed to be caused by adsorption of impurities in the cathode, although no firm evidence for this degradation mechanism has been presented. In this article, we demonstrate that the rapid degradation of these SOECs is indeed caused by impurities, and that operation without degradation is possible when removing these impurities from the inlet gases. Cleaning the inlet gases may be a solution for operating SOECs without long-term degradation.

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Section: Resultsmentioning

confidence: 92%

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confidence: 99%

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Exceptional Durability of Solid Oxide Cells

Ebbesen¹,

Mogensen²

2010

Electrochem. Solid-State Lett.

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“…A combination of favourable thermodynamics and kinetics at high temperatures (500-1000°C) offers reduced electrical energy consumption per unit of hydrogen compared to low temperature water electrolysis, and thus may provide a cost-effective route to hydrogen production. This approach is particularly advantageous if a high temperature electrolyser may be simply and efficiently coupled to a source of renewable solar [3,4], geothermal [5,6], wind [4] or nuclear [7] electrical energies, to produce carbon-free hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Modelling the dynamic response of a solid oxide steam electrolyser to transient inputs during renewable hydrogen production

Cai

Brandon

Adjiman

2010

Front. Energy Power Eng. China

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Hydrogen is regarded as a leading candidate for alternative future fuels. Solid oxide electrolyser cells (SOEC) may provide a cost-effective and green route to hydrogen production especially when coupled to a source of renewable electrical energy. Developing an understanding of the response of the SOEC stack to transient events that may occur during its operation with intermittent electricity input is essential before the realisation of this technology. In this paper, a one-dimensional (1D) dynamic model of a planar SOEC stack has been employed to study the dynamic behaviour of such an SOEC and the prospect for stack temperature control through variation of the air flow rate.Step changes in the average current density from 1.0 to 0.75, 0.5 and 0.2 A/cm 2 have been imposed on the stacks, replicating the situation in which changes in the supply of input electrical energy are experienced, or the sudden switch-off of the stack. Such simulations have been performed both for open-loop and closed-loop cases. The stack temperature and cell voltage are decreased by step changes in the average current density. Without temperature control via variation of the air flow rate, a sudden fall of the temperature and the cell potential occurs during all the step changes in average current density. The temperature excursions between the initial and final steady states are observed to be reduced by the manipulation of the air flow rate. Provided that the change in the average current density does not result in a transition from exothermic to endothermic operation of the SOEC, the use of the air flow rate to maintain a constant steady-state temperature is found to be successful.

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“…A combination of favourable thermodynamics and kinetics at high temperature (500-1000 °C), offers reduced electrical energy consumption per unit of hydrogen compared to low temperature water electrolysis, and thus may provide a cost-effective route to hydrogen production. This approach is particularly advantageous if a HT electrolyser may be simply and efficiently coupled to a source of renewables (solar [1,2], geothermal [3,4] and wind [2]) or nuclear [5] electrical energy, to produce carbon-free hydrogen. A number of studies [1][2][3][4][5] have shown that such coupled systems are technically feasible and economically viable.…”

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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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Can high temperature steam electrolysis function with geothermal heat?

Cited by 112 publications

References 0 publications

Exceptional Durability of Solid Oxide Cells

Exceptional Durability of Solid Oxide Cells

Modelling the dynamic response of a solid oxide steam electrolyser to transient inputs during renewable hydrogen production

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

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