Small, Год журнала: 2024, Номер unknown
Опубликована: Дек. 17, 2024
Lowering the thermal expansion coefficient (TEC) and promoting catalytic activity of cobalt-based perovskite air electrodes is crucial for efficient solid oxide cells (SOCs) devices. However, co-achievement both merits has usually been largely compromised in most scenarios. Herein, a dual-doping strategy to manipulate properties cobaltate electrocatalyst reported which high valence element Ta
Язык: Английский
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Янв. 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.
Язык: Английский
Процитировано
3
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Июль 12, 2024
Abstract Reversible protonic ceramic electrochemical cells (R‐PCECs) are very promising as energy conversion and storage devices with high efficiency at intermediate temperatures (500–700 °C). Unfortunately, the sluggish reaction kinetics on air electrodes severely hamper commercial application of R‐PCECs. In this work, an In‐doped PrBaCo 2 O 5+δ electrode is developed a designed formula 1.9 0.1 , which however consists dominated double perovskite PrBa 0.95 Co 1.85 0.09 minor cubic BaCo 0.85 0.15 3‐δ phase, suggested by XRD refinements. The formation nanocomposites induced In‐doping has markedly improved activity oxygen reduction (ORR) evolution (OER), due likely to increased vacancies, enhanced surface exchange bulk diffusion capabilities when compared bare . Excellent performances in fuel cell (FC) mode (2.25 W cm −2 ) electrolysis (EC) (−4.41 A 1.3 V) achieved single such nanocomposite 700 °C. addition, durability tests modes FC (100 h), EC cycling (210 h) demonstrated 600 This strategy provides novel approach developing new materials.
Язык: Английский
Процитировано
8
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Янв. 5, 2025
Abstract Slow reaction kinetics of air electrodes is a common problem faced by low‐temperature (<650 °C) oxygen‐ion conducting solid oxide fuel cells (O‐SOFCs) and proton‐conducting reversible proton ceramic (R‐PCCs). Here, an innovative approach proposed to design prepare two efficient durable Ba 0.5 Sr Co 0.8 Fe 0.2 O 3−δ (BSCF)‐based nanocomposites through self‐reconstruction strategy, which aim optimize both the bulk surface properties electrode materials simultaneously. Specifically, with nominal composition 0.4 Cs 0.1 0.7 M (M═Ni, Zr) consisted major perovskite phase surface‐enriched NiO BaZrO 3 minor phases. When Ni (BSCsCFNi) used as in O‐SOFCs, peak power density 1.36 W cm −2 at 650 °C; while Zr (BSCsCFZr) R‐PCCs, 1.24 current −1.98 A (1.3 V) are achieved °C, exhibits stable reversibility over 100 h. Theoretical calculations experiments indicate that + doping enhances conduction oxygen ions protons; nanoparticles enhance adsorption exchange; increase steam hydration capacity. This study provides new idea for designing cells.
Язык: Английский
Процитировано
1
Advanced Functional Materials, Год журнала: 2024, Номер 34(49)
Опубликована: Авг. 15, 2024
Abstract Reversible protonic ceramic electrochemical cells (R‐PCECs) have garnered significant attention owing to their proficiency in efficiently converting and storing energy. The performance of R‐PCECs is largely limited by the activity durability oxygen reduction/evolution reactions air electrodes. Herein, an Nb Y doped cobalt‐based double perovskite PrBaCo 1.8 0.1 O 5+δ (denoted as PBCNY) reported. however situ assembled into a deficient‐PrBa 1−x Co 0.1−x parental phase Ba 2 YNbO 6 secondary during operation, accordingly demonstrating low area‐specific resistance 0.24 Ω cm at 600 °C. high attributed enhancement vacancy concentration, surface exchange, bulk diffusion coefficient, confirmed X‐ray photoelectron spectroscopy electrical conductivity relaxation. At 700 °C, when PBCNY cathode applied electrodes for R‐PCECs, peak power density 1.99 W −2 current −5.20 A (at 1.3 V) are achieved fuel cell (FC) mode, electrolysis (EL) mode with appropriate Faradaic efficiencies. Furthermore, display promising operational stability FC (over 100 h), EL 200 reversible cyclic testing (29 cycles 120 h).
Язык: Английский
Процитировано
7
Small, Год журнала: 2024, Номер unknown
Опубликована: Окт. 4, 2024
Abstract Solid oxide fuel cells (SOFCs) are considered as advanced energy conversion technologies due to the high efficiency, flexibility, and all‐solid structure. Nevertheless, their widespread applications strongly hindered by operational temperatures, limited material selection choices, inferior long‐term stability, relatively costs. Therefore, reducing temperatures of SOFCs intermediate‐temperature (IT, 500–800 °C) range can remarkably promote practical enabling use low‐cost materials enhancing cell stability. conventional cathodes for high‐temperature display electrocatalytic activity oxygen reduction reaction (ORR) at reduced temperatures. Barium cobaltite (BaCoO 3‐δ )‐based perovskite oxides regarded promising IT‐SOFCs because free lattice volume large vacancy content. However, BaCoO ‐based suffer from poor structural thermal compatibility, insufficient ionic conductivity. Herein, an in‐time review about recent advances in is presented emphasizing design strategies including functional/selectively doping, deficiency control, (nano)composite construction enhance ORR activity/durability compatibility. Finally, currently existed challenges future research trends presented. This will provide valuable insights development electrocatalysts various conversion/storage technologies.
Язык: Английский
Процитировано
7
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Авг. 1, 2024
Abstract Perovskite oxides, particularly double perovskite have drawn significant research interest within the fields of solid‐state chemistry and materials science. As a quintessential oxide, Sr 2 Fe 1.5 Mo 0.5 O 6‐δ (SFM) has unique electronic, magnetic, catalytic properties. These attributes make it promising candidate for energy conversion storage applications. This review offers comprehensive overview advancements using SFM across various applications, including solid oxide cells, protonic ceramic electrocatalysis. Notably, highlights emerging optimization strategies that enhance functionality based on fundamental understanding reaction mechanisms. The concludes by discussing persistent challenges facing SFM‐based functional materials, as well their prospects, considering both industrial
Язык: Английский
Процитировано
6
Advanced Materials, Год журнала: 2024, Номер unknown
Опубликована: Авг. 28, 2024
Protonic ceramic electrochemical cells (PCECs) have received considerable attention as they can directly generate electricity and/or produce chemicals. Development of the electrodes with trifunctionalities oxygen reduction/evolution and nonoxidative ethane dehydrogenation is yet challenging. Here these findings are reported in design trifunctional for PCECs a detailed composition Mn
Язык: Английский
Процитировано
5
Journal of the European Ceramic Society, Год журнала: 2025, Номер unknown, С. 117346 - 117346
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
0
Materials Science and Engineering B, Год журнала: 2025, Номер 317, С. 118188 - 118188
Опубликована: Март 4, 2025
Язык: Английский
Процитировано
0
ACS Energy Letters, Год журнала: 2025, Номер unknown, С. 1874 - 1883
Опубликована: Март 25, 2025
Язык: Английский
Процитировано
0