The effect of pore-former morphology on the electrochemical performance of solid oxide fuel cells under combined fuel cell and electrolysis modes

Laguna‐Bercero, M. A.; Hanifi, Amir Reza; Menand, Lucile; Sandhu, Navjot; Anderson, Neil; Etsell, Thomas H.; Sarkar, Partha

doi:10.1016/j.electacta.2018.02.055

Cited by 20 publications

(14 citation statements)

References 37 publications

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“…In addition to the materials of electrolyte, cathode, and anode, the microstructure of the SOEC also affects the electrochemical performance. For Ni–YSZ cathode, different kinds of pore‐formers, such as polymethyl methacrylate (PMMA), graphite, potato starch, ammonium carbonate, and ammonium oxalate, have been used to explore the effect of cathode microstructure on the SOEC performance . The results demonstrate that the cell using PMMA possesses well distributed and finer pores in the supporting layer of cathode, and displays the highest electrochemical performance.…”

Section: Microstructurementioning

confidence: 99%

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

et al. 2019

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which has caused serious global warming. According to Intergovernmental Panel on Climate Change, global warming of 1.5 °C above preindustrial levels will come true by 2055 and bring about severe environmental and ecological issues, [2] such as ocean acidification, sea level rise, and species extinction. Therefore, it is urgently needed to reduce the atmospheric CO 2 concentration. [3] Apart from utilizing renewable energy resources to substitute for fossil fuels, CO 2 capture and storage (CCS) processes, and CO 2 capture and utilization (CCU) processes have been developed to effectively diminish the existing atmospheric CO 2 concentration. [4] The CCS processes are often expensive and laborious, and face the risk of CO 2 leakage, while the CCU processes are able to convert the captured CO 2 to value-added carbon-containing chemicals powered by external energy and has attracted more and more research interests recently. However, the conversion of CO 2 to target products is relatively difficult due to its extremely stable CO bonds. Several approaches for CO 2 conversion have been developed, such as photosynthesis, thermocatalytic reduction, electrochemical reduction, and photochemical conversion. Compared with other approaches, electrochemical reduction is more attractive because of two reasons: 1) electrochemical reduction process is controllable through adjusting the applied voltage and reaction temperature, and 2) the process can utilize renewable energy resources such as wind, solar, hydroelectric, and geothermal energies to electrochemically convert CO 2 to useful chemicals, which forms a carbon-neutral energy cycle and simultaneously provides an efficient storage method for renewable energy resources.Several types of electrolysis cell have been systematically investigated for CO 2 electroreduction as listed in Table 1. The first type operates in H-shaped electrochemical cells with liquid electrolyte at low temperatures (<100 °C).[5] Gaseous CO 2 reactant is dissolved into the liquid electrolyte and transported to the electrode surface, which is subsequently electroreduced to CO, HCOOH, CH 4 , C 2 H 4 , C 2 H 5 OH, and so on. [1,6] Although high Faradaic efficiency of products from CO 2 electroreduction has been achieved by exploring efficient catalysts recently, the current density of CO 2 electrolysis is relatively low due to the low CO 2 solubility and the competitive High-temperature CO 2 electrolysis in solid-oxide electrolysis cells (SOECs) could greatly assist in the reduction of CO 2 emissions by electrochemically converting CO 2 to valuable fuels through effective electrothermal activation of the stable CO bond. If powered by renewable energy resources, it could also provide an advanced energy-storage method for their intermittent output. Compared to low-temperature electrochemical CO 2 reduction, CO 2 electrolysis in SOECs at high temperature exhibits higher current density and energy efficiency and has thus attracted much recent attention. The history of its development and its fundamental mech...

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Section: Microstructurementioning

confidence: 99%

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

et al. 2019

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“…When the cell works continuously in independent SOFC or SOEC mode for 24 h, the cell still performs stably without obvious performance degradation (Figure 6b). A longer test duration is conducted up to 144 h with continuous switching between SOFC and SOEC modes to evaluate the reversibility of the cell, 50 as shown in Figure 6c. It is first operated in SOEC mode for 7 h and then operated in SOFC mode for another 14 h. It could be found that no matter what kind of test is applied, RSOC with LSFN oxygen electrode always exhibits excellent reversibility and stability.…”

Section: Reversibility and Stability Of Rsocsmentioning

confidence: 99%

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Tian

Wang

Liu

et al. 2019

ACS Appl. Energy Mater.

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Reversible solid oxide cells have received increasing attention due to high efficiency. Cobalt-free perovskite electrode has compatible thermal expansion coefficient matching with the electrolyte and the reversible operation to inhibit the segregation of Sr. Herein a novel cobalt-free La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3−δ perovskite is developed and investigated as oxygen electrode for reversible solid oxide cells. The electrochemical performance of La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3−δ oxygen electrode in fuel cell mode and electrolysis mode is investigated in detail. The maximum power density of 961 mW cm −2 and polarization resistance of 0.142 Ω cm 2 at 800 °C can be achieved in fuel cell mode. While the cell is operated in electrolysis mode, the current density ranges from 0.53 A cm −2 at 750 °C to 1.09 A cm −2 at 850 °C with 50 vol % absolute humidity at 1.3 V, and the hydrogen generation rate can reach up to 1348.5 mL (cm 2 h) −1 with 90 vol % absolute humidity at 800 °C. The reversible solid oxide cells show excellent reversibility and stability during 144 h medium-term reversible operation. The results indicate that La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3−δ has a bright prospect as the oxygen electrode material for reversible solid oxide cells.

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“…Controlling porosity can improve electrode performance by facilitating gas diffusion [44]. Laguna-Bercero et al [45] reported microbeads with 6 µm diameter is a good pore former for generating a microstructure that works well in both SOEC and SOFC modes.…”

Section: Introductionmentioning

confidence: 99%

Improvement of La0.8Sr0.2MnO3−δ Cathode Material for Solid Oxide Fuel Cells by Addition of YFe0.5Co0.5O3

et al. 2022

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The high efficiency of solid oxide fuel cells with La0.8Sr0.2MnO3−δ (LSM) cathodes working in the range of 800–1000 °C, rapidly decreases below 800 °C. The goal of this study is to improve the properties of LSM cathodes working in the range of 500–800 °C by the addition of YFe0.5Co0.5O3 (YFC). Monophasic YFC is synthesized and sintered at 950 °C. Composite cathodes are prepared on Ce0.8Sm0.2O1.9 electrolyte disks using pastes containing YFC and LSM powders mixed in 0:1, 1:19, and 1:1 weight ratios denoted LSM, LSM1, and LSM1, respectively. X-ray diffraction patterns of tested composites reveal the presence of pure perovskite phases in samples sintered at 950 °C and the presence of Sr4Fe4O11, YMnO3, and La0.775Sr0.225MnO3.047 phases in samples sintered at 1100 °C. Electrochemical impedance spectroscopy reveals that polarization resistance increases from LSM1, by LSM, to LSM2. Differences in polarization resistance increase with decreasing operating temperatures because activation energy rises in the same order and equals to 1.33, 1.34, and 1.58 eV for LSM1, LSM, and LSM2, respectively. The lower polarization resistance of LSM1 electrodes is caused by the lower resistance associated with the charge transfer process.

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The effect of pore-former morphology on the electrochemical performance of solid oxide fuel cells under combined fuel cell and electrolysis modes

Cited by 20 publications

References 37 publications

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Improvement of La0.8Sr0.2MnO3−δ Cathode Material for Solid Oxide Fuel Cells by Addition of YFe0.5Co0.5O3

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The effect of pore-former morphology on the electrochemical performance of solid oxide fuel cells under combined fuel cell and electrolysis modes

Cited by 20 publications

References 37 publications

High‐Temperature CO2 Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

High‐Temperature CO2 Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

Cobalt-Free Perovskite Oxide La0.6Sr0.4Fe0.8Ni0.2O3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells

Improvement of La0.8Sr0.2MnO3−δ Cathode Material for Solid Oxide Fuel Cells by Addition of YFe0.5Co0.5O3

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High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

High‐Temperature CO₂ Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

Cobalt-Free Perovskite Oxide La_0.6Sr_0.4Fe_0.8Ni_0.2O_3−δ as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells