Part load operation of a solid oxide electrolysis system for integration with renewable energy sources

Sanz-Bermejo, Javier; Muñoz-Antón, Javier; González-Aguilar, José; Romero, Manuel

doi:10.1016/j.ijhydene.2015.04.059

Cited by 47 publications

(23 citation statements)

References 19 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, there is an increasing need for production of renewable fuels for the transport sector. In this context, SOECs can play a major role for PtG and PtL applications, by the means of co-electrolysis of H 2 O and CO 2 to synthesis gas (H 2 + CO), and further on to hydrocarbons [2][3][4][5][6][7]. One of the promising scenarios is to use SOECs for methane production, which can be stored and distributed in the existing natural gas infrastructure [8].…”

Section: Introductionmentioning

confidence: 99%

Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis

Rao

Jensen²,

Sun

et al. 2019

Fuel Cells

View full text Add to dashboard Cite

In the renewable energy scenario, energy storage is of essence. In this context, power‐to‐liquid (PtL) and power‐to‐gas (PtG) concepts have attracted large attention, where the use of solid oxide electrolysis cells (SOECs) has a huge potential, due to their high conversion efficiencies. However, performance and durability of these cells still need to be improved for a large‐scale commercialization of the SOEC technology. It is often difficult to identify the various loss and degradation mechanisms limiting the cell performance and durability. This paper contributes to this scientific discussion, by providing a careful analysis of the degradation mechanisms occurring in three different cells during long‐term H2O and CO2 co‐electrolysis, at 1,200 mV. Electrochemical impedance spectroscopy (EIS) is measured before, during and after the electrolysis operation, and is utilized to address the individual electrode degradation mechanisms and the development of leaks through the electrolyte. Moreover, the leak rates under open circuit voltage (OCV) measurements were compared. In addition, microstructural analysis of the electrodes and electrolytes is related to the electrochemical findings to contribute to the discussion on the interdependency of the degradation mechanisms.

show abstract

Section: Introductionmentioning

confidence: 99%

Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis

Rao

Jensen²,

Sun

et al. 2019

Fuel Cells

View full text Add to dashboard Cite

show abstract

“…1 Solar and wind energy have already acquired the status of matured technologies for renewable electricity production. [2][3][4] The larger shares of electricity from these fluctuating sources require efficient electricity storage technologies. Some of the examples of such available storage technologies are compressed air, batteries and flywheels.…”

mentioning

confidence: 99%

“…In case of renewable energy production, intermittent energy can be stored in the form of gas or liquids through fuel production from syngas. 2,[6][7][8] The motivation of using SOECs in the context of PtL and PtG solutions is due to its high electrical efficiency, up to 100%. To perform electrolysis operation, the required energy is provided partly by the high temperature operation of SOEC and the remainder is provided by electricity.…”

mentioning

confidence: 99%

A Comparative Study of Durability of Solid Oxide Electrolysis Cells Tested for Co-Electrolysis under Galvanostatic and Potentiostatic Conditions

Rao¹,

Sun²,

Hagen³

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

State-of-the-art SOECs consisting of a nickel-yttria stabilized zirconia (Ni-YSZ) fuel electrode, YSZ electrolyte and lanthanum strontium cobaltite ferrite-gadolinium doped ceria (LSCF-GDC) composite oxygen electrode were tested under co-electrolysis (H 2 O+CO 2 ) conditions. The aim in this study was to compare the SOEC durability under co-electrolysis conditions between galvanostatic and potentiostatic modes. Specifically, the cells were operated at 0.75 A/cm 2 (galvanostatic) and at 1.2 V (potentiostatic) at 750 • C for over 1000 hours. In both modes, a larger degradation was observed initially for the first 200 hours of testing, followed by a more stable performance over longer operating times. Interestingly, there was a difference in trends of serial and polarization resistances' evolution. In galvanostatic mode of operation, both increased while for potentiostatic mode only the polarization resistance increased over time. The difference of the degradation was attributed to the overpotentials being experienced by the cells in the respective modes. Trends of the area specific resistance (ASR) and detailed electrochemical analysis of the performance of the cell under durability conditions for both modes indicated that the degradation was due to both the fuel electrode and the oxygen electrode, with an additional contribution from fuel electrode in galvanostatic testing. Microstructural analysis also confirmed the degradation of the active fuel electrode.

show abstract

“…In this context, fuel cells and electrolysis cells become interesting for both, energy production and storage. Especially, high temperature electrolysis using solid oxide electrolysis cells (SOECs) has gained significant interest, owing to the capability to convert CO 2 and H 2 O together to produce syngas (2,(4)(5)(6). Power-to-Gas (PtG) and Power-to-liquid (PtL) scenarios have gathered significant attention in the past few decades.…”

Section: Introductionmentioning

confidence: 99%

Long Term Testing of Solid Oxide Electrolysis Cells under Co-Electrolysis Conditions

Rao

Sun

Hagen³

2017

ECS Trans.

View full text Add to dashboard Cite

SOECs consisting of a nickel-yttria stabilized zirconia (Ni-YSZ) fuel electrode, YSZ electrolyte and lanthanum strontium cobalt ferritegadolinium doped ceria (LSCF-GDC) composite oxygen electrode were tested under co-electrolysis (H 2 O+CO 2 ) conditions. The aim in this study was to compare the SOEC durability under co-electrolysis conditions between galvanostatic and potentiostatic modes. Specifically, the cells were operated at 0.75 A/cm 2 (galvanostatic) and at 1.2 V (potentiostatic) at 750 o C for over 1000 hours. In both modes, a larger degradation was observed initially for the first 200 hours of testing, followed by a more stable performance over longer operating times. Trends of the area specific resistance (ASR) and detailed electrochemical analysis of the cell's performance under durability conditions for both modes indicated that the degradation was predominantly due to the fuel electrode along with a slight contribution from the oxygen electrode. Microstructural analysis also confirmed the degradation of the active fuel electrode.

show abstract

Part load operation of a solid oxide electrolysis system for integration with renewable energy sources

Cited by 47 publications

References 19 publications

Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis

Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis

A Comparative Study of Durability of Solid Oxide Electrolysis Cells Tested for Co-Electrolysis under Galvanostatic and Potentiostatic Conditions

Long Term Testing of Solid Oxide Electrolysis Cells under Co-Electrolysis Conditions

Contact Info

Product

Resources

About