Lowering the synthesis temperature of Y3Fe5O12 by surfactant assisted solid state reaction

Xue, Fei; Huang, Ju; Li, Tianrui; Wang, Zifan; Zhou, Xiaochao; Wei, Lujun; Gao, Baizhi; Zhai, Ya; Li, Qi; Xu, Qingyu; Du, Jun

doi:10.1016/j.jmmm.2017.08.076

Cited by 21 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This work provides a detailed analysis of employing the energy band structure concept to understand and illustrate the mechanism in terms of energy band alignment for the formation of oxygen vacancies that assist in the enhancement of ionic conduction and the stoppage of electronic conduction by altering the valence band maxima via doping of Mg. For this purpose, UV–vis spectroscopy and UPS were employed to understand the energy band structure of the as-prepared materials. Generally, UV–vis spectroscopy was used to obtain the energy band gaps using the following Tauc plots from the optical absorption spectra as below where α, h ν, and β o are the absorption coefficient, energy of photons, and energy independent constant, respectively . The direct or indirect band gap nature of the material can be predicted from the Tauc plot, that is, by plotting (α h υ) n versus the incident photon’s energy (eV); where “α” is the absorption coefficient, “ h ” is the Planck’s constant, and “υ” is the frequency of the incident photon.…”

Section: Resultsmentioning

confidence: 99%

Modulating the Energy Band Structure of the Mg-Doped Sr_0.5Pr_0.5Fe_0.2Mg_0.2Ti_0.6O_3−δ Electrolyte with Boosted Ionic Conductivity and Electrochemical Performance for Solid Oxide Fuel Cells

Rauf

Hanif

Mushtaq

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Achieving fast ionic conductivity in the electrolyte at low operating temperatures while maintaining the stable and high electrochemical performance of solid oxide fuel cells (SOFCs) is challenging. Herein, we propose a new type of electrolyte based on perovskite Sr0.5Pr0.5Fe0.4Ti0.6O3−δ for low-temperature SOFCs. The ionic conducting behavior of the electrolyte is modulated using Mg doping, and three different Sr0.5Pr0.5Fe0.4–x Mg x Ti0.6O3−δ (x = 0, 0.1, and 0.2) samples are prepared. The synthesized Sr0.5Pr0.5Fe0.2Mg0.2Ti0.6O3−δ (SPFMg0.2T) proved to be an optimal electrolyte material, exhibiting a high ionic conductivity of 0.133 S cm–1 along with an attractive fuel cell performance of 0.83 W cm–2 at 520 °C. We proved that a proper amount of Mg doping (20%) contributes to the creation of an adequate number of oxygen vacancies, which facilitates the fast transport of the oxide ions. Considering its rapid oxide ion transport, the prepared SPFMg0.2T presented heterostructure characteristics in the form of an insulating core and superionic conduction via surface layers. In addition, the effect of Mg doping is intensively investigated to tune the band structure for the transport of charged species. Meanwhile, the concept of energy band alignment is employed to interpret the working principle of the proposed electrolyte. Moreover, the density functional theory is utilized to determine the perovskite structures of SrTiO3−δ and Sr0.5Pr0.5Fe0.4–x Mg x Ti0.6O3−δ (x = 0, 0.1, and 0.2) and their electronic states. Further, the SPFMg0.2T with 20% Mg doping exhibited low dissociation energy, which ensures the fast and high ionic conduction in the electrolyte. Inclusively, Sr0.5Pr0.5Fe0.4Ti0.6O3−δ is a promising electrolyte for SOFCs, and its performance can be efficiently boosted via Mg doping to modulate the energy band structure.

show abstract

Section: Resultsmentioning

confidence: 99%

Modulating the Energy Band Structure of the Mg-Doped Sr_0.5Pr_0.5Fe_0.2Mg_0.2Ti_0.6O_3−δ Electrolyte with Boosted Ionic Conductivity and Electrochemical Performance for Solid Oxide Fuel Cells

Rauf

Hanif

Mushtaq

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Where the absorption coefficient is presented by α, photons energy is shown by hν, and energy independent constant is depicted by β o , respectively. [ 66 ] The absorption spectra of SFT and SnO 2 display a negligible lower‐energy absorption tail, illustrating the indirect band gap characteristics of prepared materials. [ 67 ] As observed, the absorption edges of SFT and SnO 2 are at approx.…”

Section: Resultsmentioning

confidence: 99%

Highly Active Interfacial Sites in SFT‐SnO₂ Heterojunction Electrolyte for Enhanced Fuel Cell Performance via Engineered Energy Bands: Envisioned Theoretically and Experimentally

Rauf

Hanif

Wali

et al. 2023

Energy & Environ Materials

View full text Add to dashboard Cite

Extending the ionic conductivity is the pre‐requisite of electrolytes in fuel cell technology for high‐electrochemical performance. In this regard, the introduction of semiconductor‐oxide materials and the approach of heterostructure formation by modulating energy bands to enhance ionic conduction acting as an electrolyte in fuel cell‐device. Semiconductor (n‐type; SnO2) plays a key role by introducing into p‐type SrFe0.2Ti0.8O3‐δ (SFT) semiconductor perovskite materials to construct p‐n heterojunction for high ionic conductivity. Therefore, two different composites of SFT and SnO2 are constructed by gluing p‐ and n‐type SFT‐SnO2, where the optimal composition of SFT‐SnO2 (6:4) heterostructure electrolyte‐based fuel cell achieved excellent ionic conductivity 0.24 S cm−1 with power‐output of 1004 mW cm−2 and high OCV 1.12 V at a low operational temperature of 500 °C. The high power‐output and significant ionic conductivity with durable operation of 54 h are accredited to SFT‐SnO2 heterojunction formation including interfacial conduction assisted by a built‐in electric field in fuel cell device. Moreover, the fuel conversion efficiency and considerable Faradaic efficiency reveal the compatibility of SFT‐SnO2 heterostructure electrolyte and ruled‐out short‐circuiting issue. Further, the first principle calculation provides sufficient information on structure optimization and energy‐band structure modulation of SFT‐SnO2. This strategy will provide new insight into semiconductor‐based fuel cell technology to design novel electrolytes.

show abstract

“…As a result, no electrostatic interactions due to absent of different charges in the solution between the cell surface and as -synthesised Au microwires suspended in hexane. As generally accepted, CTAB alone is highly toxic cationic surfactant [57][58][59] and the conjugate systems of Au microwires -CTAB are proven to still contribute to toxicity to culture cells especially when the elevated concentrations of CTAB are present (50 g/ml commercial Au microwires-CTAB). With increasing the amount of Au microwires-CTAB solution, the cytotoxicity of the sample is increased caused by the nonspeci c binding tendency of CTAB to negatively charged cell surfaces by electrostatic interactions [57,60].…”

Section: Cytotoxicity Evaluation Of As-synthesised and Commercial Au mentioning

confidence: 99%

Synthesis, Characterisation and Cytotoxicity of Gold Microwires for Ultra-Sensitive Biosensor Development

Lah

Gray

Trigueros

2020

Preprint

View full text Add to dashboard Cite

With the long-term goal of developing an ultra-sensitive microcantilever-based biosensor for versatile biomarker detection, new controlled bioreceptor-analytes systems are being explored to overcome the disadvantages of conventional ones. Gold (Au) microwires have been used as a probe to overcome the tolerance problem that occurs in response to changes in environmental conditions. However, the cytotoxicity of Au microwires is still unclear. Here, we examined the cytotoxicity of Au microwires systems using both commercial and as-synthesised Au microwires. In vitro experiments show that commercial Au microwires with an average quoted length of 5.6 µm are highly toxic against Gram-negative Escherichia coli (E. coli) at 50 µg/ml. However, this toxicity is due to the presence of CTAB surfactant not by the microwires. Conversely, the as-synthesised Au microwires show non-cytotoxicity even at the maximum viable concentration (330µg/ml). These findings may lead to the development of potentially life-saving cytotoxicity -free biosensors for an early diagnostic of potential diseases.

show abstract

Lowering the synthesis temperature of Y3Fe5O12 by surfactant assisted solid state reaction

Cited by 21 publications

References 20 publications

Modulating the Energy Band Structure of the Mg-Doped Sr_0.5Pr_0.5Fe_0.2Mg_0.2Ti_0.6O_3−δ Electrolyte with Boosted Ionic Conductivity and Electrochemical Performance for Solid Oxide Fuel Cells

Modulating the Energy Band Structure of the Mg-Doped Sr_0.5Pr_0.5Fe_0.2Mg_0.2Ti_0.6O_3−δ Electrolyte with Boosted Ionic Conductivity and Electrochemical Performance for Solid Oxide Fuel Cells

Highly Active Interfacial Sites in SFT‐SnO₂ Heterojunction Electrolyte for Enhanced Fuel Cell Performance via Engineered Energy Bands: Envisioned Theoretically and Experimentally

Synthesis, Characterisation and Cytotoxicity of Gold Microwires for Ultra-Sensitive Biosensor Development

Contact Info

Product

Resources

About

Lowering the synthesis temperature of Y3Fe5O12 by surfactant assisted solid state reaction

Cited by 21 publications

References 20 publications

Modulating the Energy Band Structure of the Mg-Doped Sr0.5Pr0.5Fe0.2Mg0.2Ti0.6O3−δ Electrolyte with Boosted Ionic Conductivity and Electrochemical Performance for Solid Oxide Fuel Cells

Modulating the Energy Band Structure of the Mg-Doped Sr0.5Pr0.5Fe0.2Mg0.2Ti0.6O3−δ Electrolyte with Boosted Ionic Conductivity and Electrochemical Performance for Solid Oxide Fuel Cells

Highly Active Interfacial Sites in SFT‐SnO2 Heterojunction Electrolyte for Enhanced Fuel Cell Performance via Engineered Energy Bands: Envisioned Theoretically and Experimentally

Synthesis, Characterisation and Cytotoxicity of Gold Microwires for Ultra-Sensitive Biosensor Development

Contact Info

Product

Resources

About

Modulating the Energy Band Structure of the Mg-Doped Sr_0.5Pr_0.5Fe_0.2Mg_0.2Ti_0.6O_3−δ Electrolyte with Boosted Ionic Conductivity and Electrochemical Performance for Solid Oxide Fuel Cells

Modulating the Energy Band Structure of the Mg-Doped Sr_0.5Pr_0.5Fe_0.2Mg_0.2Ti_0.6O_3−δ Electrolyte with Boosted Ionic Conductivity and Electrochemical Performance for Solid Oxide Fuel Cells

Highly Active Interfacial Sites in SFT‐SnO₂ Heterojunction Electrolyte for Enhanced Fuel Cell Performance via Engineered Energy Bands: Envisioned Theoretically and Experimentally