New mixed ionic and electronic conductors based on LaScO3: Protonic ceramic fuel cells electrodes

Плеханов, М. С.; Кузьмин, А. В.; Tropin, E. S.; Королев, Д. А.; Ananyev, M.V.

doi:10.1016/j.jpowsour.2019.227476

Cited by 32 publications

(13 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More interestingly, the low (or DC) frequency resistance converges toward the x-intercept which suggest the presence of electronic conductivity and redox processes once these electrodes come in contact with the chimney precipitant across the membrane. [33][34] Similar findings were observed in the chimney experiments, where the electroactive species buildup of hydrothermal precipitates within the chimney ( Figure 10B) enveloped the electrodes, albeit only ionic conduction was detected as attributable by the lack of membrane separation between the blocking electrodes. EIS can enable instantaneous monitoring of the distribution of time constants within both experimental systems throughout the injection period.…”

Section: Resultssupporting

confidence: 80%

“…However, for the electrode pair across the membrane, substantial decreases in double‐layer capacitances and resistances were observed (Figure 10B), indicating formation of the electroactive precipitate material also driven by concentration / chemical gradients between the two reservoirs. More interestingly, the low (or DC) frequency resistance converges toward the x‐intercept which suggest the presence of electronic conductivity and redox processes once these electrodes come in contact with the chimney precipitant across the membrane [33–34] . Similar findings were observed in the chimney experiments, where the electroactive species buildup of hydrothermal precipitates within the chimney (Figure 10B) enveloped the electrodes, albeit only ionic conduction was detected as attributable by the lack of membrane separation between the blocking electrodes.…”

Section: Resultssupporting

confidence: 63%

See 1 more Smart Citation

Chemical Gardens as Electrochemical Systems: In Situ Characterization of Simulated Prebiotic Hydrothermal Vents by Impedance Spectroscopy

et al. 2020

View full text Add to dashboard Cite

In an early earth or planetary chimney systems, hydrothermal fluid chemistry and flow durations play a large role in the chimney's ability to drive electrochemical reactions for the origin of life. We performed continuous electrochemical impedance spectroscopy (EIS) characterization on inorganic membranes representing prebiotic hydrothermal chimney vents in natural seafloor systems, by incorporating an electrode array into a chimney growth experiment. Localized potential and capacitances profiles in the chimney reveal a dynamic system where redox processes are driven by transport phenomena, increasing rapidly due to disequilibrium until achieving equilibrium at about 100 mV and 1000 μF/cm 2. The impedance in the chimney interior is three orders of magnitude lower (100 Ohms/ cm 2 vs 100 KOhms/cm 2) than at the ocean or the ocean/ chimney interface. The calculated peak dissipation factor (DF) values are more than ten times higher (40.0 vs 3.0) and also confirm the elevated chemical reactivity in the chimney interior.

show abstract

Section: Resultssupporting

confidence: 80%

Section: Resultssupporting

confidence: 63%

Chemical Gardens as Electrochemical Systems: In Situ Characterization of Simulated Prebiotic Hydrothermal Vents by Impedance Spectroscopy

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The well-studied orthorhombic-doped perovskite LaScO 3 exhibits high oxygen-ionic and proton conductivities. This complex oxide has been successfully doped into various sublattices [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. In a dry atmosphere, acceptor-doped LaScO 3 is a mixed oxygen ion and hole conductor.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO

et al. 2022

View full text Add to dashboard Cite

This paper demonstrates the possibility of creating oxygen deficiency in perovskites A+3B+3O3 by introducing two types of cations with different charges into the B-sublattice. For this, it is proposed to introduce a two-charged cation, for example, Zn2+, as an alternative to alkaline earth metals. Previously, this possibility was demonstrated for aluminate LaAlO3 and indate LaInO3. In this article, we have focused on the modification of the scandium-containing perovskite LaScO3. The novel oxygen-deficient perovskite La2ScZnO5.5 and doped phases La1.9Ca0.1ScZnO5.45, La2Sc0.9Ca0.1ZnO5.45, and La2Sc0.9Mg0.1ZnO5.45 were obtained via a solid-state reaction process. Their phase composition and hydration were investigated by XRD and TGA + MS techniques. The conductivities of these materials were measured by the electrochemical impedance technique under atmospheres of various water vapor partial pressures. All phases crystallized in orthorhombic symmetry with the Pnma space group. The phases were capable of reversible water uptake; the proton concentration increased in the order of La2ScZnO5.5 < La2Sc0.9Mg0.1ZnO5.45 < La2Sc0.9Ca0.1ZnO5.45 ≈ La1.9Ca0.1ScZnO5.45 and reached ~90% hydration limit for Ca2+-doped phases. The total conductivities increased with the increase in the free lattice volume in the sequence of σLa2ScZnO5.5 < σLa2Sc0.9Mg0.1ZnO5.45 < σLa1.9Ca0.1ScZnO5.45 < σLa2Sc0.9Ca0.1ZnO5.45, the activation energy decreased in the same sequence. The sample La2Sc0.9Ca0.1ZnO5.45 showed the highest conductivity of about 10−3 S∙cm−1 at 650 °C (dry air pH2O = 3.5·10−5 atm). Water incorporation was accompanied by an increase in conductivity in wet air (pH2O = 2·10−2 atm) due to the appearance of proton conductivity. The sample La2Sc0.9Ca0.1ZnO5.45 showed a conductivity of about 10−5 S∙cm−1 at 350 °C (pH2O = 2·10−2 atm). A comparison of conductivities of obtained phase La2ScZnO5.5 with the conductivities of La2AlZnO5.5 and La2InZnO5.5 was made; the nature of the B-cation did not significantly affect the total conductivity.

show abstract

“…Among them, durability is the most important factor to consider. Hitherto, people have made a lot of effort to improve ionic conductivity and control the cell degradation rate, such as new material fabrication, − morphology design, − fabrication technical optimization, − and so on. However, the transition metal (Mn, Fe, Ni, Co) dopant technology seems to be stagnant.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Ionic Conductivity and Durability of Novel Solid Oxide Fuel Cells by Constructing a Heterojunction Based on Transition and Rare Earth Metal Co-doped Ceria

Liu

Jiang

Zhang

et al. 2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Low temperature performance and durability have been the main indicators of fuel cells. In this work, we develop a novel solid oxide fuel cell (SOFC) by constructing a heterostructure electrolyte based on Gd0.15Ni0.05Ce0.8O2−δ (GNDC) and SnO2, which acquires an open circuit voltage of 1.026 V and a maximum power density (MPD) of 879.4 mW cm–2 at 550 °C. It is demonstrated that the composites are a hybrid ionic and protonic conductor with competent conductivity of 0.124–0.220 S cm–1 at 450–550 °C. Further characterization authenticates the valence state alteration of Ni, creating more oxygen vacancies during the tests. Also, the existence of the Schottky junction is detected to confirm the electron suppressing effects due to the Schottky barrier. These two key points guarantee the superionic conductivity and promising durability of the cells. This work thus presents a creative insight for constructing low temperature solid oxide fuel cells (LT-SOFCs).

show abstract

New mixed ionic and electronic conductors based on LaScO3: Protonic ceramic fuel cells electrodes

Cited by 32 publications

References 42 publications

Chemical Gardens as Electrochemical Systems: In Situ Characterization of Simulated Prebiotic Hydrothermal Vents by Impedance Spectroscopy

Chemical Gardens as Electrochemical Systems: In Situ Characterization of Simulated Prebiotic Hydrothermal Vents by Impedance Spectroscopy

Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO

Enhanced Ionic Conductivity and Durability of Novel Solid Oxide Fuel Cells by Constructing a Heterojunction Based on Transition and Rare Earth Metal Co-doped Ceria

Contact Info

Product

Resources

About