Intermediate temperature solid oxide fuel cell under internal reforming: Critical operating conditions, associated problems and their impact on the performance

Silva-Mosqueda, Dulce María; Elizalde‐Blancas, Francisco; Pumiglia, Davide; Santoni, Francesca; Boigues-Muñoz, Carlos; McPhail, Stephen J.

doi:10.1016/j.apenergy.2018.10.117

Cited by 17 publications

(12 citation statements)

References 60 publications

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“…The cells present an Anode Supported Cell (ASC) configuration, with an active surface of 2 cm 2 (cathode limited). The thicker supporting anode substrate, together with a very thin layer of electrolyte allows lower operating temperatures (between 650-700 °C) [12], with respect to other manufacturers. In particular, the SOFC samples were supplied from three different production batches (Batch#1, Batch#2 and Batch#3).…”

Section: Methodsmentioning

confidence: 99%

Impedance-based Solid Oxide Fuel Cell testing as scalable and reliable Quality Control tool for cell and batch manufacturing: first findings

et al. 2022

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Testing is a necessary step in the manufacturing process of Solid Oxide Fuel Cells (SOFC) to assess the performance of the produced cells before on-field deployment. In this work, the implementation of Electrochemical Impedance Spectroscopy (EIS) and subsequent data elaboration via Equivalent Circuit Modelling (ECM) is evaluated as a viable experimental framework for characterization and Quality Control (QC) of cells or cell batches, complemented to standard polarization-based methods. By performing a statistical analysis of the ECM parameters (representative of each physico-chemical process) the cell and batch operational parameters can be determined and compared. The validity of the proposed methodology is assessed using a wide experimental dataset of a significant number of SOFC samples (20 cells from 3 batches – two of which identical and the third with an intentional modification in the manufacturing process in order to validate the proposed methodology) tested in identical conditions. Results show that the impedance-based method provide detailed information in terms of impedance breakdown (anode gas diffusion process resulting the main criticality), as well as confirming the preliminary results obtained from the polarization approach (Batch#2 showing the lowest total performance and highest uniformity). Highly reproducible intra-batch distributions of the ECM parameters encourage the applicability of such methodology for QC purposes, even with few data collected only in Open Circuit Voltage (OCV) conditions. A relevant deviation of charge transfer and diffusion resistances in Batch#3 respect to other batches is observed (not visible from the polarization curves), which is reconducted to the modified anode functional layer, opening potential applications of the proposed methodology to assess the impact of targeted modifications of manufacturing methods on specific cell electrochemical performances.

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Section: Methodsmentioning

confidence: 99%

Impedance-based Solid Oxide Fuel Cell testing as scalable and reliable Quality Control tool for cell and batch manufacturing: first findings

et al. 2022

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“…Other than the electrochemical conversion pathway (which is solely dependent on the cell current) concurrent chemical reactions (reforming and shift reactions) can occur in the anode chamber thanks to the high operating temperature and Ni catalyst presence, allowing the use of a wide spectrum of hydrocarbon fuels as previously described [20,31].…”

Section: Solid Oxide Fuel Cells-brief Technology Overviewmentioning

confidence: 99%

“…Overall polarization losses are given by the sum of activation and concentration losses. Finally, in the case of unconventional fuel supply to the SOFC, additional losses related to the chemical conversion processes are added [31].…”

Section: Solid Oxide Fuel Cells-brief Technology Overviewmentioning

confidence: 99%

“…In addition, the thermal load significantly impacts the performance stability of the sample, with little possibility for thermal cycling, cold-stops or re-use of the same sample for further multiple testing [46]. From a fuel quality point of view, as previously described, low temperature fuel cells strictly require high hydrogen purity while high temperature fuel cells are able to process a wide range of fuels, including hydrocarbon [13,20,31].…”

Section: Solid Oxide Fuel Cells-laboratory Scale Considerationsmentioning

confidence: 99%

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Experimental Procedures & First Results of an Innovative Solid Oxide Fuel Cell Test Rig: Parametric Analysis and Stability Test

et al. 2021

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Solid Oxide Fuel Cells are a promising technology for Solid Oxide Fuel Cells (SOFC) are a promising technology For high-efficiency electrochemical conversion of a vast range of fuel gas mixtures, thigh operating temperature conditions (650–900 °C) represent a challenge both at system level and at laboratory testing level, in terms of material properties and performance dynamics. In this work a detailed procedural analysis is presented for an innovative all-ceramic compact SOFC test rig and first experimental testing results are reported in terms of polarization curves obtained under parametric variation of operating conditions (H2 content, air ratio λ and temperature) and short-term voltage stability test under load (140 h at 0.3 A/cm2). The electrochemical characterization results confirm the validity of the used all-ceramic cell holder, showing excellent cell performances in terms of polarization. H2 content has the most impact on SOFC performance, followed by temperature and finally air ratio, whose impact in the analyzed range is hardly seen. From the short-term stability test, the test bench setup reliability is demonstrated, showing no significant performance degradation after 140 continuous hours under load, which confirms the high quality and reproducibility of the results.

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“…However, there are several bottlenecks associated with conventional SOFC, one of the major challenges is high operational temperature, which still plagued many researchers. The yttrium-stabilized zirconia (YSZ) and doped ceria as the desired electrolyte materials should fulfill sufficient ion-conducting at more than 800 °C [5, 6]. High operational temperature needs an exact thermal match and chemical compatibility between anode, cathode, and electrolyte.…”

Section: Introductionmentioning

confidence: 99%

The sintering temperature effect on electrochemical properties of Ce0.8Sm0.05Ca0.15O2-δ (SCDC)-La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) heterostructure pellet

et al. 2019

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Recently, semiconductor-ionic materials (SIMs) have emerged as new functional materials, which possessed high ionic conductivity with successful applications as the electrolyte in advanced low-temperature solid oxide fuel cells (LT-SOFCs). In order to reveal the ion-conducting mechanism in SIM, a typical SIM pellet consisted of semiconductor La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) and ionic conductor Sm and Ca Co-doped ceria Ce 0.8 Sm 0.05 Ca 0.15 O 2-δ (SCDC) are suffered from sintering at different temperatures. It has been found that the performance of LSCF-SCDC electrolyte fuel cell decreases with the sintering temperature, the cell assembled from LSCF-SCDC pellet sintered at 600 °C exhibits a peak power density ( P max ) of 543 mW/cm 2 at 550 °C and also excellent performance of 312 mW/cm 2 even at LT (500 °C). On the contrary, devices based on 1000 °C pellet presented a poor P max of 106 mW/cm 2 . The performance difference may result from the diverse ionic conductivity of SIM pellet through different temperatures sintering. The high-temperature sintering could severely destroy the interface between SCDC and LSCF, which provide fast transport pathways for oxygen ions conduction. Such phenomenon provides direct and strong evidence for the interfacial conduction in LSCF-SCDC SIMs. Electronic supplementary material The online version of this article (10.1186/s11671-019-2979-x) contains supplementary material, which is available to authorized users.

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Intermediate temperature solid oxide fuel cell under internal reforming: Critical operating conditions, associated problems and their impact on the performance

Cited by 17 publications

References 60 publications

Impedance-based Solid Oxide Fuel Cell testing as scalable and reliable Quality Control tool for cell and batch manufacturing: first findings

Impedance-based Solid Oxide Fuel Cell testing as scalable and reliable Quality Control tool for cell and batch manufacturing: first findings

Experimental Procedures & First Results of an Innovative Solid Oxide Fuel Cell Test Rig: Parametric Analysis and Stability Test

The sintering temperature effect on electrochemical properties of Ce0.8Sm0.05Ca0.15O2-δ (SCDC)-La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) heterostructure pellet

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