High-performance La0·3Sr0·7Fe0·9Ti0·1O3-δ as fuel electrode for directly electrolyzing CO2 in solid oxide electrolysis cells

Hou, Yunting; Wang, Lijun; Bian, Liuzhen; Wang, Yadun; Chou, Kuo‐Chih; Kumar, Vasant

doi:10.1016/j.electacta.2020.136026

Cited by 28 publications

(17 citation statements)

References 44 publications

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“…The La 1– x Sr x FeO 3−δ -based perovskite materials show great potential due to their excellent oxygen-ion conductivity. , Good ORR activity has been exhibited when La 1– x Sr x FeO 3−δ was used in oxygen electrodes, − while the materials were easily decomposed when applied in fuel electrodes. The structural stability in reducing atmosphere can be improved by high valence element doping. , In our previous study, La 0.3 Sr 0.7 Fe 0.9 Ti 0.1 O 3−δ (LSFTi 91) exhibited good structural stability and the smallest polarization resistance as a single-phase fuel electrode for SOECs . However, the performance and reversibility of LSFTi 91 as a symmetric electrode for SOFCs and SOECs have not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Excellent Electrochemical Performance of La_0.3Sr_0.7Fe_0.9Ti_0.1O_3−δ as a Symmetric Electrode for Solid Oxide Cells

Hou

Wang

Bian

et al. 2021

ACS Appl. Mater. Interfaces

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Solid oxide cells (SOCs) can switch between fuel cell and electrolysis cell modes, which alleviate environmental and energy problems. In this study, the La0.3Sr0.7Fe0.9Ti0.1O3−δ (LSFTi 91) perovskite is innovatively used as a symmetric electrode for solid oxide electrolysis cells (SOECs) and solid oxide fuel cells (SOFCs). LSFTi 91 exhibits a pure perovskite phase in both oxidizing and reducing atmospheres, and the maximum conductivity in air and 5% H2/Ar is 150 and 1.1 S cm–1, respectively, which meets the requirement of the symmetric electrode. The polarization resistance (R p) at 1.5 V is as low as 0.09 Ω cm2 in the SOEC mode due to the excellent CO2 adsorption capacity. The current density can reach 1.9 A cm–2 at 1.5 V and 800 °C, which is the highest electrolytic performance in the reported single-phase electrodes. LSFTi 91 also exhibits eminent oxygen reduction reaction and hydrogen oxidation reaction (ORR and HOR) activities, with R p of 0.022 and 0.15 Ω cm2 in air and wet H2, respectively. The peak power density of SOFC could reach 847 mW cm–2 at 800 °C. In addition, good reversibility is confirmed in the cyclic operation of SOFC and SOEC.

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Section: Introductionmentioning

confidence: 99%

Excellent Electrochemical Performance of La_0.3Sr_0.7Fe_0.9Ti_0.1O_3−δ as a Symmetric Electrode for Solid Oxide Cells

Hou

Wang

Bian

et al. 2021

ACS Appl. Mater. Interfaces

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“…This is because the electrode presents n-type conductance at low oxygen partial pressure, in which the conductivity is dominated by the free electrons. 27,29 Fe 4+ and Mo 6+ are reduced to generate the oxygen vacancies during this condition, as shown in formulas (1)–(3) , where and represent the ions of Fe 4+ and Mo 6+ , respectively. The reduction of Fe 4+ and Mo 6+ is accompanied by the consumption of lattice oxygen, resulting in the formation of oxygen vacancies.…”

Section: Resultsmentioning

confidence: 99%

“…The conductivity of LSF and LSFM increases with the rise of temperature, which is similar to the trend of Sr 2 Fe 1.5 Mo 0.5 O 6 and La 0.3 Sr 0.7 Fe 0.9 Ti 0.1 O 3Àd materials. 27,28 Compared with LSF material, the conductivity of LSFMo increased at the same temperatures. For example, it increased from 0.24 S cm À1 to 0.41 S cm À1 at 850 C. This is because the electrode presents n-type conductance at low oxygen partial pressure, in which the conductivity is dominated by the free electrons.…”

Section: Conductivitymentioning

confidence: 99%

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Electrochemical properties of La_0.5Sr_0.5Fe_0.95Mo_0.05O_3−δ as cathode materials for IT-SOEC

Hou

Wang

et al. 2021

RSC Adv.

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“…In CO 2 atmosphere, the Sm 1– x Ca x Fe 1– y Cu y O 3– δ shows p‐type semiconductor behaviour, and the electron holes combines with oxidized Fe 4+ as primary carries. The corresponding formula is described below32:

true \frac{1}{2} O_{2} + V_{O}^{• •} + 2 {Fe}_{Fe}^{\times} \to O_{O}^{\times} + 2 h^{•} + 2 {Fe}_{Fe}^{•}

…”

Section: Resultsmentioning

confidence: 99%

Ca/Cu Co‐doped SmFeO₃ as a Fuel Electrode Material for Direct Electrolysis of CO₂ in SOECs▴

et al. 2020

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The electrochemical conversion of CO 2 to CO by using solid oxide electrolysis cell (SOEC) is an attractive technology for sustainable utilization of greenhouse gas to chemicals. In this work, Ca and/or Cu doped SmFeO 3 perovskite materials in the form of Sm 1-x Ca x Fe 1-y Cu y O 3-d (x = 0, y = 0; x = 0.1, y = 0; x = 0, y = 0.1; x = 0.1, y = 0.1) are evaluated as SOEC fuel electrode for direct electrolysis of CO 2. The Ca and Cu co-doped sample Sm 0.9 Ca 0.1 Fe 0.9 Cu 0.1 O 3-d (SCFCO) presents the highest electrical conductivity value of 15.18 S cm-1 among all of the samples under CO 2 atmosphere at 700°C. The electrochemical impedance spectroscopy analysis reveals that the CO 2 dissociative adsorption and charge transfer of Ca and Cu co-doped fuel electrode are significantly enhanced, resulting in the greatly decrease in polarization resistance compared with that of the undoped sample. The current density of an electrolyte-supported single cell with the SCFCO fuel electrode reaches as high as 1.20 A cm-2 at the applied voltage of 1.5 V and 800°C, which is 60% higher than that of the SmFeO 3-d fuel electrode. Furthermore, the cell shows an impressive stability for the durability test, indicating the excellent electrocatalysis performance and coking tolerance of SCFCO as a promising fuel electrode material for direct electrolysis of CO 2 .

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High-performance La0·3Sr0·7Fe0·9Ti0·1O3-δ as fuel electrode for directly electrolyzing CO2 in solid oxide electrolysis cells

Cited by 28 publications

References 44 publications

Excellent Electrochemical Performance of La_0.3Sr_0.7Fe_0.9Ti_0.1O_3−δ as a Symmetric Electrode for Solid Oxide Cells

Excellent Electrochemical Performance of La_0.3Sr_0.7Fe_0.9Ti_0.1O_3−δ as a Symmetric Electrode for Solid Oxide Cells

Electrochemical properties of La_0.5Sr_0.5Fe_0.95Mo_0.05O_3−δ as cathode materials for IT-SOEC

Ca/Cu Co‐doped SmFeO₃ as a Fuel Electrode Material for Direct Electrolysis of CO₂ in SOECs▴

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High-performance La0·3Sr0·7Fe0·9Ti0·1O3-δ as fuel electrode for directly electrolyzing CO2 in solid oxide electrolysis cells

Cited by 28 publications

References 44 publications

Excellent Electrochemical Performance of La0.3Sr0.7Fe0.9Ti0.1O3−δ as a Symmetric Electrode for Solid Oxide Cells

Excellent Electrochemical Performance of La0.3Sr0.7Fe0.9Ti0.1O3−δ as a Symmetric Electrode for Solid Oxide Cells

Electrochemical properties of La0.5Sr0.5Fe0.95Mo0.05O3−δ as cathode materials for IT-SOEC

Ca/Cu Co‐doped SmFeO3 as a Fuel Electrode Material for Direct Electrolysis of CO2 in SOECs▴

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Excellent Electrochemical Performance of La_0.3Sr_0.7Fe_0.9Ti_0.1O_3−δ as a Symmetric Electrode for Solid Oxide Cells

Excellent Electrochemical Performance of La_0.3Sr_0.7Fe_0.9Ti_0.1O_3−δ as a Symmetric Electrode for Solid Oxide Cells

Electrochemical properties of La_0.5Sr_0.5Fe_0.95Mo_0.05O_3−δ as cathode materials for IT-SOEC

Ca/Cu Co‐doped SmFeO₃ as a Fuel Electrode Material for Direct Electrolysis of CO₂ in SOECs▴