Effects of B‐site doping and stoichiometry on strontium ferrate Sr0.85Ce0.15FexCoyO3 perovskites as electrocatalysts DOI Creative Commons
Maria Laura Tummino, Leonarda Francesca Liotta, Massimiliano Lo Faro

и другие.

Journal of the American Ceramic Society, Год журнала: 2025, Номер unknown

Опубликована: Март 29, 2025

Abstract SrFeO 3 ‐based oxides are multi‐functional ceramics belonging to the ABO ‐type perovskite family, where iron is interestingly present at B‐site as Fe 4+ and partially reducible 3+ by doping strategies tailor physical–chemical properties. When doped, fine‐tuned exploitable in novel energy production systems, for example, electrocatalysts intermediate temperature solid oxide fuel cells (IT‐SOFCs). This work aimed evaluate how composition stoichiometry affect functional properties of materials when A‐site with cerium fixed 15 mol%. Hence, powdered samples were prepared solution combustion synthesis, modulating Fe/Co ratio or (Fe + Co). From an in‐depth characterization, it was found that both nonstoichiometry influenced structure, redox properties, electrochemical behavior. Still, played a major role improving oxygen adsorption capacity mobility, also thanks contribution segregated phases (CeO 2 , Sr O 7− δ ) generated induced unbalancing. The nonstoichiometric sample reached highest reduction capability IT‐SOFC operating (600°C) lowest activation (0.65 eV), whereas cobalt‐rich showed poorer performance electrode. These results encourage further research on tunable cobalt‐poor perovskites energy‐related devices.

Язык: Английский

Agglomeration-Resistant Ni Nanoparticles Generated by In Situ Hydrogenation Treatment of LaNiO3 as Catalyst for the Ammonia Decomposition DOI
Jiaxin Li, Junhui Liang, Xin Yao

и другие.

ACS Applied Nano Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

The development of low-temperature, nonprecious metal thermocatalysts for ammonia decomposition holds significant promise advancing the green hydrogen industry. LaNiO3 catalysts, with their perovskite structure (ABX3), are notable enabling in situ growth active Ni on reduced oxide supports during reactions (ADRs). However, unintentional can lead to uncontrolled and particle agglomeration. To address this, we employed a straightforward high-temperature pressure hydrogenation pretreatment process enhance interaction between support, thereby suppressing agglomeration ADR process. Our results indicate that catalyst exhibits finer nanoparticles, an average size approximately 8 nm. Under gas hourly space velocity (GHSV) 18,000 mL gcat–1 h–1 at 550 °C, NH3 conversion efficiency reaches 90%, which exhibited excellent stability over period 100 h. Additionally, utilized TEM, XPS, EPR, NH3-TPD, H2-TPR techniques elucidate intrinsic mechanisms related enhanced catalytic activity. This study addresses issue nanoparticle through pretreatment.

Язык: Английский

Процитировано

0
Effects of B‐site doping and stoichiometry on strontium ferrate Sr0.85Ce0.15FexCoyO3 perovskites as electrocatalysts DOI Creative Commons
Maria Laura Tummino, Leonarda Francesca Liotta, Massimiliano Lo Faro

и другие.

Journal of the American Ceramic Society, Год журнала: 2025, Номер unknown

Опубликована: Март 29, 2025

Abstract SrFeO 3 ‐based oxides are multi‐functional ceramics belonging to the ABO ‐type perovskite family, where iron is interestingly present at B‐site as Fe 4+ and partially reducible 3+ by doping strategies tailor physical–chemical properties. When doped, fine‐tuned exploitable in novel energy production systems, for example, electrocatalysts intermediate temperature solid oxide fuel cells (IT‐SOFCs). This work aimed evaluate how composition stoichiometry affect functional properties of materials when A‐site with cerium fixed 15 mol%. Hence, powdered samples were prepared solution combustion synthesis, modulating Fe/Co ratio or (Fe + Co). From an in‐depth characterization, it was found that both nonstoichiometry influenced structure, redox properties, electrochemical behavior. Still, played a major role improving oxygen adsorption capacity mobility, also thanks contribution segregated phases (CeO 2 , Sr O 7− δ ) generated induced unbalancing. The nonstoichiometric sample reached highest reduction capability IT‐SOFC operating (600°C) lowest activation (0.65 eV), whereas cobalt‐rich showed poorer performance electrode. These results encourage further research on tunable cobalt‐poor perovskites energy‐related devices.

Язык: Английский

Процитировано

0