Insight of novel layered perovskite PrSrMn2O5+δ: A neutron powder diffraction study

Afroze, Shammya; Torino, Nico; Henry, Paul F.; Reza, Sumon; Cheok, Quentin; Azad, Abul K.

doi:10.1016/j.matlet.2019.127126

Cited by 17 publications

(14 citation statements)

References 18 publications

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“…Scanning Electron Microscopy (SEM) and the Energy-Dispersive X-ray (EDX) are one of the most applicable techniques for estimating the morphological figure and the elemental properties (Zhang et al 2012;Ma et al 2016;Afroze et al 2020b). Figure 1 has shown the SEM micrographs of Pennisetum purpureum biochars for 400, 500 and 600 °C temperatures at 4000x magnifications.…”

Section: Scanning Electron Microscope (Sem) and Energy-dispersive X-rmentioning

confidence: 99%

Biochar characterization of invasive Pennisetum purpureum grass: effect of pyrolysis temperature

Reza

Afroze

Bakar

et al. 2020

Biochar

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Pennisetum purpureum is one of the most invasive perennial grasses of the Poaceae family, which are abundant in southeast Asia including Brunei Darussalam. The pyrolysis process at a slow heating rate proved to be highly promising for biochar production. The production and characterization of different Pennisetum purpureum biochars have been investigated at the pyrolysis temperatures of 400 °C, 500 °C and 600 °C with a heating and nitrogen flow rate of 5 °C/min and 0.5 L/min, respectively. The observed higher heating values were 22.18 MJ/kg, 23.02 MJ/kg, 23.75 MJ/kg, and the alkaline pH were 9.10, 9.86, 10.17 for the biochar at 400 °C, 500 °C, 600 °C temperatures, respectively. The water holding capacity was one hundred percent for all biochars and continued to increase for higher pyrolysis temperature. SEM images show that the porosity of the biochars has been enhanced with increased temperatures due to the rearrangement of crystallinity and aromaticity. On the other hand, the yields of biochar have been decreased from 35.13% to 23.02% for the increase of pyrolysis temperature from 400 °C to 600 °C. Energy dispersive X-ray analysis shows that the O/C atomic ratios were 0.15, 0.08 and 0.06 for the biochar of 400, 500 and 600 °C which validates the improvement in heating values. FT-IR analysis revealed that the available functional groups in the biochars were CO , C=C, and C-H. Thermogravimetric analysis (TGA) under pyrolysis condition showed residue of 46.56%, 51.13% and 55.67% from the biochar at 400, 500, and 600 °C, respectively. The derivative thermogravimetry (DTG) graph indicates that the degradation rate is higher for 400 °C biochar than the 600 °C biochar.

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Section: Scanning Electron Microscope (Sem) and Energy-dispersive X-rmentioning

confidence: 99%

Biochar characterization of invasive Pennisetum purpureum grass: effect of pyrolysis temperature

Reza

Afroze

Bakar

et al. 2020

Biochar

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“…e solid-state synthesis technique [18,[29][30][31][32][33] was applied to developing NdSrMn 2 O 5+δ . Oxide powders of Nd 2 O 3 (≥99.90%, Sigma-Aldrich), SrCO 3 (≥99.90%, Aldrich), and MnO (≥99.50%, Aldrich) were weighed according to their stoichiometric ratios and ground with the aid of a mortar and pestle using ethanol as a reagent [34].…”

Section: Methodsmentioning

confidence: 99%

Investigation of Structural and Thermal Evolution in Novel Layered Perovskite NdSrMn2O5+δ via Neutron Powder Diffraction and Thermogravimetric Analysis

Afroze

Reza

Henry

et al. 2020

International Journal of Chemical Engineering

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Neutron diffraction is one of the best methods for structural analysis of a complex, layered perovskite material with low symmetry by accurately detecting the oxygen positions through octahedral tilting. In this research, the crystal structure of NdSrMn2O5+δ was identified through X-ray diffraction (XRD) and neutron powder diffraction (NPD) at room temperature (RT), which indicated the formation of a layered structure in orthorhombic symmetry in the Pmmm (no. 47) space group. Rietveld refinement of the neutron diffraction data has confirmed the orthorhombic symmetry with unit cell parameters (a = 3.8367 (1) Å, b = 3.8643 (2) Å, and c = 7.7126 (1) Å), atomic positions, and oxygen occupancy. Thermogravimetric analysis revealed the total weight loss of about 0.10% for 20–950°C temperature, which occurred mainly to create oxygen vacancies at high temperatures. Rietveld analyses concurred with the XRD and neutron data allowing correlation of occupancy factors of the oxygen sites.

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“…Figure 5 describes that the cell membrane is completely impenetrable, and the grains are uniformly distributed resulting in high power density values. The porous electrode also affects the performance of SOFCs [79], [80] due to their triple-phase-boundaries (TPB), which may points or lines where pores, electrolyte, and catalyst meet [81].…”

Section: Fig 4 -Equivalent Circuit For Symmetrical Cellsmentioning

confidence: 99%

Solid Oxide Fuel Cell (SOFC); A New Approach of Energy Generation during the Pandemic COVID-19

Afroze¹,

Reza²,

Cheok³

et al. 2020

IJIE

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The new coronavirus (COVID-19) has started spreading all over the world. Every infected is fighting to recover a little and every health worker is fighting to save a single life in this pandemic. There is no place for patients to stay in the hospital, health workers are given all possible services to save their lives. In this situation, uninterrupted power system is needed, which can be supplied by solid oxide fuel cells (SOFCs). Therefore, solid oxide fuel cells (SOFCs) are becoming attractive day by day with competing environmentally friendly energy sources due to high energy efficiency, low emission rate and comparatively low operating cost. The purpose of this work is to investigate how copper-doped perovskite electrode materials impact the performance of solid oxide fuel cells (SOFCs) to overcome such crucial times successfully. Different synthesis process of Cu-based electrodes and analyzing electrochemical properties were investigated in this work. The evaluation was performed in terms of synthesis process, sintering temperature, lattice type and parameters, electrical conductivity, thermal expansion coefficients (TEC), polarization resistance, activation energy, and power density. In order to provide additional energy during this pandemic COVID-19, low-cost, highly performed, and durable materials are needed to make SOFC.

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Insight of novel layered perovskite PrSrMn2O5+δ: A neutron powder diffraction study

Cited by 17 publications

References 18 publications

Biochar characterization of invasive Pennisetum purpureum grass: effect of pyrolysis temperature

Biochar characterization of invasive Pennisetum purpureum grass: effect of pyrolysis temperature

Investigation of Structural and Thermal Evolution in Novel Layered Perovskite NdSrMn2O5+δ via Neutron Powder Diffraction and Thermogravimetric Analysis

Solid Oxide Fuel Cell (SOFC); A New Approach of Energy Generation during the Pandemic COVID-19

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