Sol–gel nanocasting synthesis of patterned hierarchical LaFeO3 fibers with enhanced catalytic CO oxidation activity

Li, Pengna; Hu, Xianluo; Zhang, Lei; Dai, Hongxing; Zhang, Lizhi

doi:10.1039/c0nr00760a

Cited by 32 publications

(15 citation statements)

References 23 publications

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“…The grafting of various amounts of iron over SBA‐15 and AlSBA‐15 was carried out using LaFeO 3 as iron precursor through SED technique ,. LaFeO 3 perovskite was prepared through citrate‐based sol‐gel method by following the procedure reported in the literature . Briefly, 0.5 g of calcined AlSBA‐15 and 0.190 g of LaFeO 3 were mixed together and transferred to the 250 ml 3 neck round bottom flask containing 150 ml distilled water.…”

Section: Methodsmentioning

confidence: 99%

Alumina as Solid‐State Ligand in Enhancing the Redox Catalytic Property of Iron Oxide Grafted AlSBA‐15 towards Arylation of Arene

et al. 2018

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2–8 wt % iron has been grafted over SBA‐15 and 10 wt % alumina grafted SBA‐15 (AlSBA‐15) through selective extraction deposition technique using LaFeO3 as iron precursor in acidic solution. DRS‐UV spectra confirmed the presence of iron as isolated Fe(III), Fe(III)‐clusters and amorphous FeOx oligomers. SEM‐EDX mapping, FT‐IR, XPS, HR‐TEM and 27Al MAS NMR characterisation results confirmed that iron grafted over AlSBA‐15 preferentially reside on the alumina. The donor‐acceptor interaction of grafted iron ions with alumina atoms displaying Lewis acid properties stabilized iron at higher oxidation state Fe(III+δ). This increased the BE of Fe2p electrons (XPS) and shifted the temperature of iron reduction in 2–8 wt %Fe/AlSBA‐15 materials to higher value (600 °C) compared with Fe/SBA‐15 (H2‐TPR). In arylation of benzene, 8 wt %Fe/AlSBA‐15 demonstrated excellent redox catalytic activity with TOF close to homogeneous catalyst and 82 % biphenyl yield. The catalyst demonstrated consistent catalytic performance for 7 cycles.

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Section: Methodsmentioning

confidence: 99%

Alumina as Solid‐State Ligand in Enhancing the Redox Catalytic Property of Iron Oxide Grafted AlSBA‐15 towards Arylation of Arene

et al. 2018

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“…Figure 3b shows the La 3d core level at 852.3-835.6 eV, confirming the presence of La 3d 5/2 and La 3d 3/2 . The satellite peak with a higher binding energy at 839.1 eV matched with La 3d 5/2 , demonstrating a core hole with an electron transferred from the O 2p valence band to an empty La 4f orbital [51]. In Figure 3c, the XPS signals at 709.9 eV and 723.5 eV represent the Fe 2p 3/2 and Fe 2p 1/2 orbits, respectively, values ascribable to the Fe 3+ ionic surfaces due to spin-orbital splitting form.…”

Section: Compositional Analysis Of Nanoparticlesmentioning

confidence: 99%

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Kumar

et al. 2017

Energies

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Perovskite LaFeO 3 nanofillers (0.1%) are incorporated into a quaternized poly(vinyl alcohol) (QPVA) matrix for use as hydroxide-conducting membranes in direct alkaline methanol fuel cells (DAMFCs). The as-synthesized LaFeO 3 nanofillers are amorphous and functionalized with cetyltrimethylammonium bromide (CTAB) surfactant. The annealed LaFeO 3 nanofillers are crystalline without CTAB. The QPVA/CTAB-coated LaFeO 3 composite membrane shows a defect-free structure while the QPVA/annealed LaFeO 3 film has voids at the interfaces between the soft polymer and rigid nanofillers. The QPVA/CTAB-coated LaFeO 3 composite has lower methanol permeability and higher ionic conductivity than the pure QPVA and QPVA/annealed LaFeO 3 films. We suggest that the CTAB-coated LaFeO 3 provides three functions to the polymeric composite: increasing polymer free volume, ammonium group contributor, and plasticizer to enhance the interfacial compatibility. The composite containing CTAB-coated LaFeO 3 results in superior cell performance. A maximum power density of 272 mW cm −2 is achieved, which is among the highest power outputs reported for DAMFCs in the literature.

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“…The canted spin structure of TM ions also exhibits competing magnetic interaction and thus, giving rise to the intricate magnetic structures. LaCrO3 and LaFeO3 oxide systems exhibit antiferromagnetic transitions at ~ 290 K and 740 K respectively [1-3, 4, 5] and more interestingly, also exhibit weak ferromagnetisms near room temperature [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Anomalous magnetic behavior and complex magnetic structure of proximate LaCrO₃—LaFeO₃ system

Tiwari¹,

Dixit²,

Rao³

2020

Mater. Res. Express

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We investigated complex magnetic properties of multifunctional LaCrO3-LaFeO3 system.The magnetic measurements substantiate the presence of competing complex magnetic ordering against temperature, showing paramagnetic to ferrimagnetic transition at ~ 300 K, followed by antiferromagnetic (AFM) transition near ~250 K superimposed on ferrimagnetic phase. The onset of weak ferrimagnetic ordering is attributed to the competing complex interaction between two AFM LaCrO3-LaFeO3 sublattices. The low-temperature AFM ordering is also substantiated by temperature-dependent Raman measurements, where the intensity ratio of 700 cm -1 Raman active mode showed the clear enhancement with lowering the temperature. The non-saturating nature of magnetic moments in LaCrO3-LaFeO6 suggests the predominating AFM ordering in conjunction with ferrimagnetic ordering between 250 K -300 K up to 5 T magnetic field. A complex magnetic structure of LaCrO3-LaFeO3 is constructed, emphasizing the metastable magnetic phase near room temperature and low temperature antiferromagnetic state.

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Sol–gel nanocasting synthesis of patterned hierarchical LaFeO3 fibers with enhanced catalytic CO oxidation activity

Cited by 32 publications

References 23 publications

Alumina as Solid‐State Ligand in Enhancing the Redox Catalytic Property of Iron Oxide Grafted AlSBA‐15 towards Arylation of Arene

Alumina as Solid‐State Ligand in Enhancing the Redox Catalytic Property of Iron Oxide Grafted AlSBA‐15 towards Arylation of Arene

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Anomalous magnetic behavior and complex magnetic structure of proximate LaCrO₃—LaFeO₃ system

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Sol–gel nanocasting synthesis of patterned hierarchical LaFeO3 fibers with enhanced catalytic CO oxidation activity

Cited by 32 publications

References 23 publications

Alumina as Solid‐State Ligand in Enhancing the Redox Catalytic Property of Iron Oxide Grafted AlSBA‐15 towards Arylation of Arene

Alumina as Solid‐State Ligand in Enhancing the Redox Catalytic Property of Iron Oxide Grafted AlSBA‐15 towards Arylation of Arene

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Anomalous magnetic behavior and complex magnetic structure of proximate LaCrO3—LaFeO3 system

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Anomalous magnetic behavior and complex magnetic structure of proximate LaCrO₃—LaFeO₃ system