Electrokinetic Proton Transport in Triple (H+/O2−/e−) Conducting Oxides as a Key Descriptor for Highly Efficient Protonic Ceramic Fuel Cells

Kim, Junyoung; Jeong, Donghwi; Sengodan, Sivaprakash; Liu, Meilin; Choi, Sihyuk

doi:10.1002/advs.202004099

Cited by 35 publications

(45 citation statements)

References 37 publications

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“…The use of isotope exchange studies between O 16 /O 18 and H 2 O/D 2 O can provide more insight into the surface reactions of these materials. [328][329][330] Sample requirements including highly dense samples for both ECR and isotope exchange may necessitate nonstandard techniques such as pulsed laser deposition to achieve high densities, especially for materials with high sintering temperature. [331] A combination of ECR with permeation measurements remains as an accessible method to probing the bulk phase properties of TIEC materials.…”

Section: Opportunitiesmentioning

confidence: 99%

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Chen

Feldhoff

Weidenkaff

et al. 2021

Adv Funct Materials

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Mixed ionic-electronic conducting (MIEC) membranes have gained growing interest recently for various promising environmental and energy applications, such as H 2 and O 2 production, CO 2 reduction, O 2 and H 2 separation, CO 2 separation, membrane reactors for production of chemicals, cathode development for solid oxide fuel cells, solar-driven evaporation and energy-saving regeneration as well as electrolyzer cells for powerto-X technologies. The purpose of this roadmap, written by international specialists in their fields, is to present a snapshot of the state-of-the-art, and provide opinions on the future challenges and opportunities in this complex multidisciplinary research field. As the fundamentals of using MIEC membranes for various applications become increasingly challenging tasks, particularly in view of the growing interdisciplinary nature of this field, a better understanding of the underlying physical and chemical processes is also crucial to enable the career advancement of the next generation of researchers. As an integrated and combined article, it is hoped that this roadmap, covering all these aspects, will be informative to support further progress in academics as well as in the industry-oriented research toward commercialization of MIEC membranes for different applications.

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Section: Opportunitiesmentioning

confidence: 99%

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Chen

Feldhoff

Weidenkaff

et al. 2021

Adv Funct Materials

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“…These phases demonstrate excellent chemical compatibility with typical proton-conducting solid electrolytes due to the similarity of their compositions [ 43 , 44 ]. These compounds belong to the triple-conducting oxides (TCOs) [ 45 , 46 , 47 ], in which transport species are simultaneously protons, oxygen ions, and electrons (holes). The advantage of TCOs as cathode materials for proton-conducting SOFCs is that both protons from the solid electrolyte and oxygen species adsorbed from the air may migrate through the bulk and over the surface of the cathode, which extends the reaction area over the whole electrode.…”

Section: Cathode Materials For It–sofcs: Past Present and Futurementioning

confidence: 99%

Layered Oxygen-Deficient Double Perovskites as Promising Cathode Materials for Solid Oxide Fuel Cells

et al. 2021

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Development of new functional materials with improved characteristics for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is one of the most important tasks of modern materials science. High electrocatalytic activity in oxygen reduction reactions (ORR), chemical and thermomechanical compatibility with solid electrolytes, as well as stability at elevated temperatures are the most important requirements for cathode materials utilized in SOFCs. Layered oxygen-deficient double perovskites possess the complex of the above-mentioned properties, being one of the most promising cathode materials operating at intermediate temperatures. The present review summarizes the data available in the literature concerning crystal structure, thermal, electrotransport-related, and other functional properties (including electrochemical performance in ORR) of these materials. The main emphasis is placed on the state-of-art approaches toimproving the functional characteristics of these complex oxides.

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“…[9] 식 ( 1) 량차이다. [23][24][25] 그 결과로 다. [26,29] 그 결과로 단일 연료전지의 ohmic 저항은 650, 은 각각 0.37 및 0.28 eV, [27] PCFC의 뛰어난 성능을 보 여준 양극 물질인 PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ 는 1.31 eV의 활성화 에너지로 보고되었는데, [28] 이 수치는 본 연구에 서 측정된 BZCYYb4411 및 YBSCF의 활성화 에너지 값 과 유사하다.…”

Section: 실험 결과 및 토의unclassified

Electrochemical Evaluation of Layered Perovskite YBa0.5Sr0.5Co1.5Fe0.5O5+δ Cathode as a Triple Ionic and Electronic Conductor for Protonic Ceramic Fuel Cells

Cho¹,

Choi²

2021

Ceramist

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Protonic ceramic fuel cells (PCFCs) have receiving huge attention as a promising energy conversion device because of their high conversion efficiency, lack of fuel dilution, and high ionic conductivity at intermediate temperature regime (400 ∼ 600 oC). Although this fuel cell system can effectively solve the main obstacle for the commercialization of conventional solid oxide fuel cells, electrochemical performance is currently limited by the cathodic polarization due to insufficient catalytic activity. To overcome this issue, layered perovskite materials, PrBa0.5Sr0.5Co1.5Fe0.5O5+δ, have been discovered as triple ionic and electronic conductor, which enables to simultaneously conduct H+/O2-/e-. Despite great advantages, there is large gap in the thermal expansion coefficient (TEC) between the cathode and electrolyte. Herein, we developed a new triple conducting cathode material, YBa0.5Sr0.5Co1.5Fe0.5O5+δ (YBSCF) to minimize TEC while maintaining the high electro-catalytic activity with excellent hydration properties. Structural analysis, hydration properties, and electrochemical performances of YBSCF cathode were investigated. In particular, the peak power density of YBSCF cathode based on BaZr0.4Ce0.4Y0.1Yb0.1O3-δ (BZCYYb4411) electrolyte attained 0.702 W cm-2 at 600 oC. Moreover, power output is fairly stable for 300 h without observable degradation by applying a constant voltage of 0.7 V at 600 oC.

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Electrokinetic Proton Transport in Triple (H⁺/O²⁻/e⁻) Conducting Oxides as a Key Descriptor for Highly Efficient Protonic Ceramic Fuel Cells

Cited by 35 publications

References 37 publications

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Layered Oxygen-Deficient Double Perovskites as Promising Cathode Materials for Solid Oxide Fuel Cells

Electrochemical Evaluation of Layered Perovskite YBa0.5Sr0.5Co1.5Fe0.5O5+δ Cathode as a Triple Ionic and Electronic Conductor for Protonic Ceramic Fuel Cells

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