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Reuse of sodium–doped iridium oxide nanoparticles as a bio–stimulating electrode by a chemical and electrochemical recovery process

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Ceramics International 2024年第4期50卷 6220-6228页

作者： Tso, Kuang-Chih Chen, Chieh-Hsuan Chen, Po-Chun Li, Shao-Sian Chen, Jeng-Lung Ohta, Jun Wu, Pu-Wei Division of Materials Science Graduate School of Science and Technology Nara Institute of Science and Technology Nara630-0192 Japan Graduate Degree Program of Science and Technology of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu300 Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei106 Taiwan National Synchrotron Radiation Research Center Hsinchu300 Taiwan

A sequential chlorination and electrochemical reduction process is demonstrated to convert Na–doped iridium oxide nanoparticles into useful IrIIICl63−(aq) serving as the precursor for the fabrication of bio–stimulating electrode. The Na–doped iridium oxide nanoparticles are treated in 35 wt% hydrochloric acid at 70 °C for 18 h to form IrIVCl62−(aq) with pH of 0.3, so the latter could be readily reduced to IrIIICl63−(aq) at a potentiostatic mode of 0.6 V (vs. SCE). The oxidation state and the nature of complexing ligands for the regenerated IrIIICl63− and IrIVCl62−, as well as commercially available IrIIICl63− are validated by X–ray Absorption Spectroscopy. UV–Vis profiles of regenerated IrIVCl62−(aq) are recorded and the absorbance at 487 nm signal is benchmarked against that of standard IrIVCl62−(aq) to obtain the effective regeneration ratio of 68.6%. X–ray diffraction patterns of Na–doped iridium oxide nanoparticles before and after the annealing treatment indicate the amorphous structure facilitates the chlorination step. The regenerated IrIIICl63− is reused to synthesize Na–doped iridium oxide thin film serving as a bio–stimulating electrode for implantable bio–electronics. The regenerated Na–doped iridium oxide thin film reveals a charge-storage capacity of 0.32 mC/cm2-nm and impressive stability that are comparable to those of fresh Na–doped iridium oxide thin film derived from commercially available IrIIICl63−. © 2023 Elsevier Ltd and Techna Group S.r.l.

关键词： Transition metal oxides

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Fabrication of graphene by electrochemical exfoliation in alkaline electrolytes

Fabrication of graphene by electrochemical exfoliation in al...

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作者： Chang, Li-Chung Hsieh, Yu-Chi Chen, Yong-Min Wu, Pu-Wei Lee, Jyh-Fu Graduate Program for Science and Technology of Accelerator Light Source China Department of Materials Science and Engineering National Chiao Tung University Hsin-Chu 30010 Taiwan Taiwan National Synchrotron Radiation Research Center Hsin-Chu 30076 Taiwan Taiwan

ISBN: (纸本)9781607685395

Fabrication of graphene was demonstrated by electrochemical exfoliation of graphite in an ammonium hydroxide solution. The processing parameter of applied voltage was optimized to accomplish graphene productivity and desired chemical composition. Images from the atomic force microscopy showed graphene sheets with lateral sizes of several hundred nanometers. Images from the transmission electron microscopy indicated the existence of stacked graphene sheets with thickness of a few graphene layers. Raman spectroscopy confirmed variation of assynthesized graphene and bulk graphite. X-ray photoemission spectroscopy suggested the formation of graphene oxide at large voltage. © 2014 The Electrochemical Society.

关键词： Graphene

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Influence of Ru-substitution on the performance of pyrochlore catalysts in oxidative steam reforming of ethanol

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Sustainable Energy and Fuels 2024年第9期8卷 2104-2114页

作者： Huang, Yu-Hsuan Hsieh, Ho-Chen Wang, Yun-Hsin Weng, Sheng-Feng Lee, Chi-Shen Department of Applied Chemistry National Yang Ming Chiao Tung University 1001 University Rd Hsinchu 30010 Taiwan Graduate Degree Program of Science and Technology of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan Center for Emergent Functional Matter Science National Chiao-Tung University Hsinchu 30010 Taiwan

This study introduces a series of Ru-substituted pyrochlore catalysts, achieved by using La2Zr2−xRuxO7−δ (LZRO-00-04, x = 0.0-0.4) during the oxidative steam reforming of ethanol reaction (OSRE). The samples were cha...

This study introduces a series of Ru-substituted pyrochlore catalysts, achieved by using La₂Zr_2−xRu_xO_7−δ (LZRO-00-04, x = 0.0-0.4) during the oxidative steam reforming of ethanol reaction (OSRE). The samples were characterized using X-ray diffraction (XRD), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). The reduction behavior and catalytic performance correlate directly with the Ru content. The 5 wt% LZRO02 catalytic system outperforms the supported Ru-based catalyst (5 wt% RuO₂/LZO), boasting lower Ru concentrations (2.66 wt%). The enhancement is attributed to the uniform dispersion of Ru ≥ 4+ ions embedded within the pyrochlore structure, as convincingly supported by the XPS result. This underscores notable distinctions between the internal and external structures of the two systems. On the other hand, our extensive long-term testing of LZRO02 across γ-Al₂O₃ and lab-made LZO carriers, coupled with meticulous mapping and Raman analysis, revealed a significant observation: the catalyst exhibits notably reduced aggregation tendencies and enhanced activity when utilized on the LZO carrier. The La₂Zr_1.8Ru_0.2O_7−δ catalyst supported on LZO demonstrated selectivity of hydrogen S_H = 86.4(1)%;Y_H = 2.55(3) (mol/mol EtOH) for long-term stability tests at T = 400 °C, C/O = 0.6, and O₂/C₂H₅OH = 1.5. This discovery underscores the catalyst's remarkable stability and activity, making it a promising candidate for catalytic applications. © 2024 The Royal Society of Chemistry.

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Fabrication and ferroelectric properties of BiFeO3/LaNiO 3 artificial superlattice structures grown by radio-frequency magnetron-sputtering

Fabrication and ferroelectric properties of BiFeO3/LaNiO 3 a...

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作者： Liu, Yen-Ting Chiu, Shang-Jui Lee, Hsin-Yi Chen, San-Yuan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Materials Science and Engineering National Chiao Tung University Hsinchu Taiwan

Symmetric superlattice structures of multiferroic BiFeO3 and conductive LaNiO3 sublayers were grown on a Nb-doped SrTiO 3 substrate with radio-frequency magnetron-sputtering. The formation of a superlattice structure was confirmed from the appearance of satellite lines on both sides of the main line in the X-ray diffraction pattern. X-ray measurements show that these superlattice films become subject to greater tensile stress along the c-axis and to increased compressive stress parallel to the surface plane with a decreasing thickness of the sublayer. The smaller is the thickness of the sublayer, the greater is the crystalline quality and the strain state. The hysteresis loops show a large leakage current at frequencies of 0.5 and 1 kHz;the polarization decreases with an increasing frequency. © 2012 Elsevier B.V.

关键词： X ray scattering

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Characteristics of highly orientated BiFeO3 thin films on a LaNiO3-coated Si substrate by RF sputtering

Characteristics of highly orientated BiFeO3 thin films on a ...

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作者： Liu, Yen-Ting Chen, San-Yuan Lee, Hsin-Yi Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 300 Taiwan Department of Materials Science and Engineering National Chiao Tung University Hsinchu 300 Taiwan National Synchrotron Radiation Research Center Hsinchu Science Park 101 Hsin-Ann Road Hsinchu 30076 Taiwan

BiFeO3 (BFO) films were grown on LaNiO3-coated Si substrate by a RF magnetron sputtering system at temperatures in the range of 300-700 °C. X-ray reflectivity and high-resolution diffraction measurements were employed to characterize the microstructure of these films. For a substrate temperature below 300 °C and at 700 °C only partially crystalline films and completely randomly polycrystalline films were grown, whereas highly (001)-orientated BFO film was obtained for a substrate temperature in the range of 400-600 °C. The crystalline quality of BFO thin films increase as the deposition temperature increase except for the film deposited at 700 °C. The fitted result from X-ray reflectivity curves show that the densities of the BFO films are slightly less than their bulk values. For the BFO films deposited at 300-600 °C, the higher the deposition temperature, the larger the remnant polarization and surface roughness of the films present. © 2010 Elsevier B.V. All rights reserved.

关键词： X ray diffraction

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Femtosecond X-rays from relativistic electrons: New tools for probing structural dynamics

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Comptes Rendus de l'Academie des sciences - Series IV: Physics, Astrophysics 2001年第10期2.0卷 1373-1388页

作者： Schoenlein, Robert W. Shank, Charles V. Chong, Henry H. W. Glover, Thornton E. Heimann, Philip A. Padmore, Howard A. Leemans, Wim P. Zholents, Alexander A. Zolotorev, Max S. Corlett, John S. Materials Sciences Division Ernest Orlando Lawrence Berkeley National Laboratory United States Applied Science and Technology Graduate Group University of California Berkeley United States Advanced Light Source Lawrence Berkeley National Laboratory United States Accelerator and Fusion Research Division Lawrence Berkeley National Laboratory United States

Femtosecond X-ray science is a new frontier in ultrafast research in which time-resolved measurement techniques are applied with X-ray pulses to investigate structural dynamics at the atomic scale on the fundamental time scale of an atomic vibrational period (∼ 100 fs). This new research area depends critically on the development of suitable femtosecond X-ray sources with the appropriate flux (ph/(s-0.1% BW)), brightness (ph/(s·mm²·mrad²·0.1%BW)), and tunability for demanding optical/X-ray pump probe experiments. In this paper we review recently demonstrated techniques for generating femtosecond X-rays via interaction between femtosecond laser pulses and relativistic electron beams. We give an overview of a novel femtosecond X-ray source that is proposed based on a linear accelerator combined with X-ray pulse compression. © 2001 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS.

关键词： Beamline Femtosecond X-ray Relativistic electron Slicing Structural dynamics Synchrotron Thomson scattering

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Analysis of the synchrotron radiation from segmented undulator in double-mini beta function 8

Analysis of the synchrotron radiation from segmented undulat...

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8th International Particle accelerator Conference, IPAC 2017

作者： Luo, H.W. Chung, T.Y. Hwang, C.S. Lee, C.H. Graduate Program in Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Electrophysics National Chiao Tung University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)9783954501823

Three long straight sections with double-mini beta-y lattice were created in the Taiwan Photon source (TPS) for which the effects of focusing elements and phase shifters between the collinear undulators result in incorrect calculations of the brilliance while assuming a Gaussian-approximation. Therefore, an on-axis Wigner distribution function (WDF), which includes effects of wave phenomena, is a natural way to measure the intensity of synchrotron radiation and is used in this article as the definition of brilliance. © 2017 CC-BY-3.0 and by the respective authors

关键词： Synchrotron radiation

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Properties of synchrotron radiation from segmented undulators based on a Wigner distribution function 7

Properties of synchrotron radiation from segmented undulator...

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7th International Particle accelerator Conference, IPAC 2016

作者： Luo, H.W. Chung, T.Y. Lee, C.H. Hwang, C.S. Graduate Program in Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Department of Electrophysics National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9783954501472

Three long straight sections with a double mini-βylattice were designed in Taiwan Photon source. For the purpose to understand whether the brilliance can be enhanced or not when two collinear undulators were installed in the double mini-βysection. The method of Wigner distribution function (WDF) is a natural way to describe a synchrotron radiation source. The brilliance is thereby calculable without a Gaussian approximation used in a conventional manner. Hence the WDF is developed to calculate the brilliance for the two collinear undulators in the double mini-βysection. Some important optical properties such as the degree of coherence can be directly calculated with this method. We use it as an example to investigate the properties of radiation from a segmented undulator. Copyright © 2016 CC-BY-3.0 and by the respective authors.

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Manipulation of the nanoscale heliconical structure of a twist-bend nematic material with polarized light

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Physical Review Research 2020年第3期2卷 032004(R)-032004(R)页

作者： C. Feng J. Feng R. Saha Y. Arakawa J. Gleeson S. Sprunt C. Zhu A. Jákli Chemical Physics Interdisciplinary Program Advanced Materials and Liquid Crystal Institute Kent State University Kent Ohio 44242 USA Advanced Light Source Lawrence Berkeley National Lab Berkeley California 94720 USA Department of Physics Kent State University Kent Ohio 44242 USA Department of Applied Chemistry and Life Science Graduate School of Engineering Toyohashi University of Technology Toyohashi 441-8580 Japan

The effect of polarized violet light on the alignment and the heliconical pitch of a liquid crystal dimer containing both sulfur atoms and an azo linkage has been studied by tender resonant x-ray scattering. The results provide evidence of the manipulation of the nanoscale heliconical structure by polarized light. In addition to the bulk alignment of the heliconical nanostructure, the value of the heliconical pitch can be varied as well. After turning the light on, an increase of the pitch is observed in two steps. The increase with a subsecond timescale is attributed to the reduced heliconical order related to trans-cis photoisomerization. This is followed by a smaller increase over a 10-s timescale, which is likely related to the annihilation of defects. After turning the light off, the pitch first decreases within a few seconds to a value larger than the original (before illumination), and then relaxes further on a much longer (hours) timescale.

关键词： Chiral symmetry Dynamical phase transitions Twist deformation

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The structure and ferroelectric property of La-doped BiFeO 3/SrTiO3 artificial superlattice structure by rf sputtering: Effect of deposition temperature

The structure and ferroelectric property of La-doped BiFeO 3...

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作者： Chiu, Shang-Jui Liu, Yen-Ting Yu, Ge-Ping Lee, Hsin-Yi Huang, Jia-Hong Department of Engineering and System Science National Tsing Hua University Hsinchu 30013 Taiwan National Synchrotron Radiation Research Center Hsinchu Science Park 101 Hsin-Ann Road Hsinchu 30076 Taiwan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 300 Taiwan Institute of Nuclear Engineering and Science National Tsing Hua University Hsinchu 30013 Taiwan

Improvement of ferroelectric property by Lanthanum (La)-doping of BiFeO3 (BFO) and strain effect of high quality superlattice films deposited at temperature â‰§ 700 C was shown in this study. The in-pane (200) radial scans showed that films at deposition temperature above 700 C behaved high strained ∼-1.4% and showed epitaxity properties. The La-doped BFO superlattice structure also behaved higher polarization value ∼ 197 μC/cm2 and lower leakage current density comparing with BFO superlattice structure shown in our previous study. The ferroelectric properties of superlattice structures are enhanced by lattice strain and strongly correlated with the defect state of films. © 2012 Elsevier B.V.

关键词： Semiconductor doping

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