Novel High‐Entropy Air Electrodes Enhancing Electrochemical Performances of Reversible Protonic Ceramic Cells

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 19, 2025

Abstract Reversible protonic ceramic cells (R‐PCCs) have been in the spotlight as prominent electrochemical devices for green hydrogen production and utilization. The design of efficient air electrodes is critical enhancing cell performances, requiring high hydration ability, excellent catalytic activities, appropriate thermal expansion coefficients (TEC). Herein, novel high‐entropy oxides La(Co 0.2 Cu Fe Ni Me )O 3– δ (Me = Al, Mn, Cr) featuring five cations at B‐site ABO 3 perovskite are presented. Cr (LCCFN‐Cr) catalyst exhibits best proton incorporation ability activities among three oxides, concluded by analyzing oxygen vacancy concentration chemical bond information. Moreover, effect reduced TEC this Co‐contained oxide to a modest extent through large‐ratio substitution Co other cations. When applied an electrode, BaZr 0.6 Ce Y 0.1 Yb O electrolyte‐based R‐PCCs yielded current density 2.14 A cm −2 peak power 0.60 W , with extremely low polarization resistance 0.05 Ω 2 650 °C. These findings not only provide electrode R‐PCCs, but also demonstrate pathway effective catalysts energy conversion integrating advantages effect.

Language: Английский

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Tailoring thermal expansion for next-generation energy systems: Integrating the potential of NTE materials in SOFCs and beyond

Journal of Power Sources, Journal Year: 2025, Volume and Issue: 633, P. 236460 - 236460

Published: Feb. 8, 2025

Language: Английский

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Hydrogen Separation Properties and Characterization of Bazr0.9-Xprxin0.1o3-Δ Proton Conductors

Published: Jan. 1, 2025

Doped BaZrO3 is increasingly recognized as a highly promising material for hydrogen separation membranes, owing to its exceptional chemical stability. In the present study, BaZr0.9-xPrxIn0.1O3-δ (x=0.1, 0.2, 0.3) composites were successfully synthesized citrate sol-gel method with aim of enhancing permeation properties BaZrO3. The experimental results indicate that performance can be significantly optimized by increasing partial pressure, elevating operating temperature, employing wet sweep gas, and reducing membrane thickness. When Pr3+ doping concentration 20%, exhibits highest conductivity flux. An asymmetric thickness 29 μm demonstrates an enhanced flux 13.83×10-9 mol·cm-2·s-1 at 900°C. Stability tests conducted over period 50 hours in 20% CO2 humidified atmosphere revealed no significant degradation flux, underscoring outstanding long-term These suggest candidate applications.

Language: Английский

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Structure and Mixed Proton–Electronic Conductivity in Pr and Nb-Substituted La5.4MoO12−δ Ceramics

Materials, Journal Year: 2025, Volume and Issue: 18(3), P. 529 - 529

Published: Jan. 24, 2025

Lanthanide molybdates are materials known for their mixed proton–ionic conductivity. This study investigates the effects of Pr content and Nb-doping on crystal structure electrical properties La5.4−xPrxMo1−yNbyO12−δ (x = 0, 1.35, 2.7, 4.05, 5.4; y 0.1) series. The research focuses two primary objectives: (i) enhancing electronic conductivity through use Pr4+/Pr3+ redox pairs (ii) increasing ionic Nb5+ aliovalent doping. were thoroughly characterized by X-ray powder diffraction (XRD), photoelectron spectroscopy (XPS), transmission scanning electron microscopy (TEM SEM), complex impedance spectroscopy. average depended significantly content. In general, compositions with a higher crystallize in cubic fluorite-type structure, whereas those lower stabilize rhombohedral polymorph. However, detailed TEM studies reveal more local nanodomains incommensurate modulations. highest values observed N2 atmosphere an elevated content, 0.17 204.4 mS cm−1 x 0 5.4, respectively, at 700 °C, which is attributed to conduction mediated pair, as confirmed XPS. These findings highlight potential tailored doping strategies optimize conducting lanthanide specific high-temperature electrochemical applications.

Language: Английский

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Hydrogen separation properties and characterization of BaZr0.9-xPrxIn0.1O3-δ proton conductors

Materials Today Communications, Journal Year: 2025, Volume and Issue: unknown, P. 112366 - 112366

Published: March 1, 2025

Language: Английский

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Yttria Stabilized Zirconia Thin Film Electrolyte for Low-Temperature Solid Oxide Fuel Cells Using Sol-Gel Dip Coating Method

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

This research investigates the development and analysis of Yttria Stabilized Zirconia (YSZ) thin film electrolytes for low-temperature Solid Oxide Fuel Cells (LT-SOFCs) using sol-gel dip coating method. YSZ is valued its high ionic conductivity thermal stability, which are vital SOFC operation at reduced temperatures. The technique offers a versatile cost-effective approach to control thickness microstructure. In this study, films synthesized by varying precursor concentrations, period annealing temperatures optimize properties. Structural X-ray diffraction (XRD) confirms formation crystalline phase while Scanning electron microscopy (SEM) reveals uniform dense Results indicate that with higher 4 g longer periods, 15 min show increased surface roughness porosity. Atomic force (AFM) measurements reveal values ranging from 57.5 nm 172.0 solutions, 2 solutions exhibit between 80.3 238.8 nm. SEM images denser but more porous could affect mechanical electrical Contact angle nucleation follows Frank-van der Merwe growth mechanism, angles 20⁰ 80⁰ depending on conditions.

Language: Английский

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Technological achievements in the fabrication of tubular-designed protonic ceramic electrochemical cells

Materials Futures, Journal Year: 2024, Volume and Issue: 3(4), P. 042102 - 042102

Published: Sept. 9, 2024

Abstract Protonic ceramic electrochemical cells provide an excellent basis for the advancement of high-temperature solid oxide devices, offering potential solutions to a range challenges in hydrogen energy and carbon capture fields. The facilitated ionic transport proton-conducting electrolytes enables these operate at temperatures 100 °C–500 °C lower than those conventional with known zirconia electrolytes. As result, promising performances have been reported various types proton cells. Nevertheless, advancements demonstrated only laboratory scale, whereas their ZrO 2 -based counterparts already commercialized. This review presents overview fundamental applied aspects related fabrication tubular protonic subsequent characterization as permeation membranes, pumps, sensors, fuel cells, electrolysis reactors. A specific focus is placed on technological tube preparations derived from original powder sources well dimensional characteristics tubes, which serve indicator scaling. Therefore, this serves starting point development scaling large-scale production.

Language: Английский

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A Review of Proton-Conducting Electrolytes for Efficient Low-Temperature Solid Oxide Fuel Cells: Progress, Challenges, and Perspectives

Energy & Fuels, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 21, 2024

Aiming to replace traditional energy sources such as coal and oil, researchers from around the world are working hard develop green technologies that offer safer more efficient ways produce clean energy. In this regard, solid oxide fuel cells (SOFCs) have steadily grown in popularity because of their ability electricity through electrochemical reactions. However, notable drawback typical is high operating temperature, generally over 700–1000 °C. Low-temperature (LT-SOFCs) a promising technology offers several advantages for stationary mobile power generation at low temperatures. LT-SOFCs highly dependent on electrolyte materials characterized by proton-conducting oxides. This review discusses progress development electrolytes LT-SOFCs, including advances devices. detail, work focuses improving performance various strategies, manipulating composition properties proton-conductors, addressing opportunities challenges associated with development. Solid containing components play crucial role functioning hydrogen-based devices, electrolyzers, SOFCs, electronic systems, hydrogen separation membranes. To enhance these it essential identify efficiently conduct protons remain durable under water exposure. study valuable insights guidelines designing rapid proton diffusion strong durability, contributing continuous improvement

Language: Английский

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Proton–polaron and energy landscape among acceptor doped ACeO₃ (A = Ba²⁺, Sr²⁺, Ca²⁺, Mg²⁺) proton conductors: a first principles approach

Physical Chemistry Chemical Physics, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The physiochemical impact of the acceptor on local electronic structure proton conductors remains obscure due to multifarious issues ranging from proton–polaron interaction defect scattering events.

Language: Английский

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Engineering the one-pot synthesized Ba(Ce,Fe)O3-based composites as triple-conducting electrodes for solid oxide electrochemical cell applications

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162320 - 162320

Published: April 1, 2025

Language: Английский

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