Synchrotron X-Ray Absorption Study of Cu and Mn Doped BiFeO<sub>3</sub>-BaTiO<sub>3</sub>Multiferroic Ceramics

Chandarak, S.; Jutimoosik, Jaru; Pojprapai, Soodkhet; Srilomsak, Sutham; Rujirawat, Saroj; Yimnirun, Rattikorn; Monnor, Teerawat

doi:10.1080/00150193.2011.594772

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…Regarding the presence of Cu + , a mixture of CuO and Cu 2 O can be expected to give a spectrum visually similar to CuO, but the main peak should shift toward lower energy values. 49,50 Comparing the spectra of 200V-TiO 2 and CuO, this clearly does not happen. Therefore, the dominant oxidation state is Cu +2 .…”

Section: Resultsmentioning

confidence: 96%

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Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO₂/Cu_xO Films for Photoelectrochemical Water Splitting Applications

Levinas,

Pakstas,

Selskis

et al. 2024

J. Electrochem. Soc.

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TiO2 is a versatile photo-/electrochemically active material that finds a wide variety of applications in industry and science. Its main but often overlooked advantage is the abundance of Ti in nature, as it is the ninth most commonly found element in the Earth’s crust. Despite some drawbacks (e.g., large band gap) that limit its light conversion efficiency in comparison to other materials, it is particularly inert in corrosive media, and its properties can be modified by various means. In this study TiO2 films were synthesized by an anodization-like procedure called plasma electrolytic oxidation. By varying synthesis conditions, different morphologies and structures were obained. Moreover, successful heterostructuring was achieved by adding a copper precursor to the solution. The TiO2/CuxO films were comprehensively characterized for their structural, optical, and photoelectrochemical properties. Interpretation of X-ray phototelectron and X-ray absorption near edge spectra suggest that the content of Cu2+ increases in relation to the maximum voltage reached during synthesis. UV-Vis absorption spectra were also found to display a distinct Cu2+ absorption footprint, as well as lower optical band gap values for the heterostructures. A comprehensive photoelectrochemical characterization for water splitting in 1 M KOH revealed that the TiO2/CuxO films exhibit improved activity overall.

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Section: Resultsmentioning

confidence: 96%

“…All syntheses were started at 20 °C. A high-voltage power source (Consort EV245) and different applied currents (25,50,75, and 100 mA) were used for characterization of the process. The base electrolyte to dissolve Ti and produce TiO 2 was 0.1 M NaOH (⩾99%, Roth).…”

Section: Methodsmentioning

confidence: 99%

Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO₂/Cu_xO Films for Photoelectrochemical Water Splitting Applications

Levinas,

Pakstas,

Selskis

et al. 2024

J. Electrochem. Soc.

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“…Since the Cu absorption edge positions of all CuAg samples are nearly identical to that of the standard Cu foil, we believe that the valence state Cu was reduced to its metallic state for all CuAg samples under COR conditions. Rather than valence state, EXAFS fingerprints provide coordination information of the CuAg samples during COR 70 , 71 . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Revealing the structural evolution of CuAg composites during electrochemical carbon monoxide reduction

Wang,

Jung,

Liu

et al. 2024

Nat Commun

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Comprehending the catalyst structural evolution during the electrocatalytic process is crucial for establishing robust structure/performance correlations for future catalysts design. Herein, we interrogate the structural evolution of a promising Cu-Ag oxide catalyst precursor during electrochemical carbon monoxide reduction. By using extensive in situ and ex situ characterization techniques, we reveal that the homogenous oxide precursors undergo a transformation to a bimetallic composite consisting of small Ag nanoparticles enveloped by thin layers of amorphous Cu. We believe that the amorphous Cu layer with undercoordinated nature is responsible for the enhanced catalytic performance of the current catalyst composite. By tuning the Cu/Ag ratio in the oxide precursor, we find that increasing the Ag concentration greatly promotes liquid products formation while suppressing the byproduct hydrogen. CO2/CO co-feeding electrolysis and isotopic labelling experiments suggest that high CO concentrations in the feed favor the formation of multi-carbon products. Overall, we anticipate the insights obtained for Cu-Ag bimetallic systems for CO electroreduction in this study may guide future catalyst design with improved performance.

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“…Although pure BF‐BT ceramics have a similar issue to BiFeO 3 ceramics, in that the high leakage current makes it difficult to observe well‐saturated ferroelectric hysteresis loops, they do possess a low coercive field for compositions in the MPB region. It was also discovered that doping with small amounts of Mn led to dramatic improvements in resistivity 3,12 attracting more interest in BF‐BT ceramics 13–16 . In subsequent research, it was suggested that an excess of 0.5 wt% Mn in BF‐BT ceramics was necessary to obtain optimum properties 17,18 …”

Section: Introductionmentioning

confidence: 99%

“…It was also discovered that doping with small amounts of Mn led to dramatic improvements in resistivity 3,12 attracting more interest in BF-BT ceramics. [13][14][15][16] In subsequent research, it was suggested that an excess of 0.5 wt% Mn in BF-BT ceramics was necessary to obtain optimum properties. 17,18 It has been shown by many researchers that the use of quenching procedures is an effective way to transform the slim ferroelectric polarization-electric field (P-E) loops in BiFeO 3 ceramics into a more open, well-saturated form 19 and consequently it is possible to obtain remarkable functional properties by this means.…”

Section: Introductionmentioning

confidence: 99%

Surface structure and quenching effects in BiFeO₃‐BaTiO₃ ceramics

Wang

Hall

2021

J Am Ceram Soc.

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The structure and properties of Mn‐doped 0.67BiFeO3‐0.33BaTiO3 ceramics are systematically investigated with respect to the effects of annealing prior to rapid cooling by quenching in air. Air‐quenching induces a change in crystal structure from pseudo‐cubic to rhombohedral, with higher quenching temperatures leading to an increased rhombohedral distortion. These structural changes are correlated with the appearance of more well‐defined ferroelectric domain configurations. It is shown that the surface preparation procedures for XRD measurements can induce significant changes in the peak profiles, indicating differences in crystal structure between the surface and bulk regions. Frequency dispersion in the temperature‐dependent relative permittivity for the as‐sintered sample is significantly reduced after quenching, accompanied by enhancement of the Curie point and improved temperature‐stability of piezoelectric properties. It is proposed that the formation of defect clusters by A‐site cation diffusion during cooling is circumvented by quenching, leading to the observed modification of structural distortion and ferroelectric properties.

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Synchrotron X-Ray Absorption Study of Cu and Mn Doped BiFeO₃-BaTiO₃Multiferroic Ceramics

Cited by 6 publications

References 9 publications

Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO₂/Cu_xO Films for Photoelectrochemical Water Splitting Applications

Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO₂/Cu_xO Films for Photoelectrochemical Water Splitting Applications

Revealing the structural evolution of CuAg composites during electrochemical carbon monoxide reduction

Surface structure and quenching effects in BiFeO₃‐BaTiO₃ ceramics

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Synchrotron X-Ray Absorption Study of Cu and Mn Doped BiFeO3-BaTiO3Multiferroic Ceramics

Cited by 6 publications

References 9 publications

Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO2/CuxO Films for Photoelectrochemical Water Splitting Applications

Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO2/CuxO Films for Photoelectrochemical Water Splitting Applications

Revealing the structural evolution of CuAg composites during electrochemical carbon monoxide reduction

Surface structure and quenching effects in BiFeO3‐BaTiO3 ceramics

Contact Info

Product

Resources

About

Synchrotron X-Ray Absorption Study of Cu and Mn Doped BiFeO₃-BaTiO₃Multiferroic Ceramics

Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO₂/Cu_xO Films for Photoelectrochemical Water Splitting Applications

Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO₂/Cu_xO Films for Photoelectrochemical Water Splitting Applications

Surface structure and quenching effects in BiFeO₃‐BaTiO₃ ceramics