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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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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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Unravelling the strong interplay for interfacial magnetic switching in metal-organic-based spintronics

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Journal of Materials Chemistry C 2024年第11期12卷 3931-3942页

作者： Chen, Wan-Ting Yu, Li-Chung Lin, Jiu-Hua Cheng, Su Ling Shiu, Hung Wei Lai, Yu-Ling Chu, Ying-Hao Chin, Yi-Ying Wang, Jeng-Han Hsu, Yao-Jane National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Graduate Program for Science and Technology of Accelerator Light Sources National Yang Ming Chiao Tung University Hsinchu30076 Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Chemistry National Taiwan Normal University Taipei11677 Taiwan Department of Photonics National Cheng Kung University Tainan70101 Taiwan Department of Physics National Chung Cheng University Chiayi62102 Taiwan

Organic semiconductors are promising building blocks for multifunctional spintronics. The spinterface plays a key role in affecting the magnetic properties of the performance of spin-based devices. Herein, we reveal the strong interfacial interplay affecting the magnetic switching at the interface of the synthetic paramagnetic tris(8-hydroxyquinoline)iron(iii) (Feq3) layer on the ferromagnetic surface. In combination with synchrotron-based analysis and density functional theory (DFT) calculations, we observed that the robust magnetic interactions of the Co/Feq3 system were strongly influenced by the interfacial reaction between Co and Feq3. As the charge transferred from the contacted Co to Feq3, the central iron was reduced from Fe(iii) to Fe(ii) and hybridized with the 8-hydroxyquinoline, causing spin polarization at the interface. The reduced central Fe(ii) exhibited apparent ferromagnetic ordering after contact with the ferromagnetic Co substrate. With increasing the Feq3 layer thickness, the central Fe reverted to its original Fe(iii) state, resulting in the disappearance of ferromagnetic ordering. The thickness dependence of the Feq3 layer on the magnetic response could be used to tune the spinterface properties and thus the interfacial magnetic interplay. These findings reveal the effect of the strong interfacial redox on the spinterface and open up a promising approach for the use of metal-organic materials in oragnic spintronic devices. © 2024 The Royal Society of Chemistry.

关键词： Organometallics

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Doping Dependence of 2-Spinon Excitations in the Doped 1D Cuprate Ba2CuO3+δ

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Physical Review Letters 2025年第14期134卷 146501-146501页

作者： Jiarui Li Daniel Jost Ta Tang Ruohan Wang Yong Zhong Zhuoyu Chen Mirian Garcia-Fernandez Jonathan Pelliciari Valentina Bisogni Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park California 94025 USA Department of Applied Physics Stanford University Stanford California 94305 USA Department of Physics Southern University of Science and Technology Shenzhen 518055 China Diamond Light Source Harwell Campus Didcot Oxfordshire OX11 0DE United Kingdom National Synchrotron Light Source II Brookhaven National Laboratory Upton New York 11973 USA

Recent photoemission experiments on the quasi-one-dimensional Ba-based cuprates suggest that doped holes experience an attractive potential not captured using the simple Hubbard model. This observation has garnered significant attention due to its potential relevance to Cooper pair formation in high-Tc cuprate superconductors. To scrutinize this assertion, we examined signatures of such an attractive potential in doped 1D cuprates Ba2CuO3+δ by measuring the dispersion of the 2-spinon excitations using Cu L3-edge resonant inelastic x-ray scattering (RIXS). Upon doping, the 2-spinon excitations appear to weaken, with a shift of the minimal position corresponding to the nesting vector of the Fermi points, qF. Notably, we find that the energy scale of the 2-spinons near the Brillouin zone boundary is substantially softened compared to that predicted by the Hubbard model in one dimension. Such a discrepancy implies missing ingredients, which lends support for the presence of an additional attractive potential between holes.

关键词： Hubbard model

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A Multi-Scale Cognitive Interaction Model of Instrument Operations at the Linac Coherent light source

arXiv

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arXiv 2024年

作者： Segal, Jonathan Hu, Wan-Lin Fuoss, Paul H. Ritter, Frank E. Shrager, Jeff School of Information Science Cornell University United States SLAC National Accelerator Laboratory United States Linac Coherent Light Source SLAC National Accelerator Laboratory United States College of IST Penn State United States Bennu Climate Inc Symbolic Systems Program Stanford University United States

The Linac Coherent light source (LCLS) is the world’s first x-ray free electron laser. It is a scientific user facility operated by the SLAC National accelerator Laboratory, at Stanford, for the U.S. Department of Energy. As beam time at LCLS is extremely valuable and limited, experimental efficiency — getting the most high quality data in the least time — is critical. Our overall project employs cognitive engineering methodologies with the goal of improving experimental efficiency and increasing scientific productivity at LCLS by refining experimental interfaces and workflows, simplifying tasks, reducing errors, and improving operator safety and stress. Here we describe a multi-agent, multi-scale computational cognitive interaction model of instrument operations at LCLS. Our model simulates aspects of human cognition at multiple cognitive and temporal scales, ranging from seconds to hours, and among agents playing multiple roles, including instrument operator, real time data analyst, and experiment manager. The model can roughly predict impacts stemming from proposed changes to operational interfaces and workflows. Example results demonstrate the model’s potential in guiding modifications to improve operational efficiency. We discuss the implications of our effort for cognitive engineering in complex experimental settings, and outline future directions for research. The model is open source and supplementary videos provide extensive detail. © 2024, CC BY.

关键词： Free electron lasers

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Coupled reaction channel analysis of one- and two-nucleon transfer in Si+ Zr

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The European Physical Journal A 2023年第11期59卷 1-13页

作者： Kumar, Chandra Gonika Yashraj Biswas, Rohan Kalkal, Sunil Nath, S. Nuclear Physics Group Inter-University Accelerator Centre Aruna Asaf Ali Marg New Delhi India Life Science Division Diamond Light Source Ltd. Diamond House Harwell Science and Innovation Campus Didcot Oxfordshire UK School of Physics and Materials Science Thapar Institute of Engineering and Technology Patiala India

Coupled reaction channel approach has been quite successful in describing the mechanism of multi-nucleon transfer in heavy ion-induced reactions. However, considerable ambiguities exist in the choice of potential parameters and the states of participating nuclides that should be coupled for a given reaction channel. Here we report simultaneous analysis of both angular distributions and excitation functions for one- and two-nucleon transfer in the systems $$^{28}$$ Si+ $$^{90,94}$$ Zr within the coupled reaction channel formalism. Spectroscopic amplitudes are obtained from the literature and large-scale shell model calculations. The uncertainties in the cross sections, introduced by the choice of effective interactions in shell model, are also investigated. While one-nucleon transfer in the system $$^{28}$$ Si+ $$^{94}$$ Zr have been well reproduced by inclusion of the ground and the first excited states of projectile-likes in the exit channel, more states of the same are to be coupled for the system $$^{28}$$ Si+ $$^{90}$$ Zr. Observed bell-shaped angular distribution of one-proton stripping channel in $$^{28}$$ Si+ $$^{94}$$ Zr is found to be caused by a large contribution of direct transfer from the ground and the first excited states of projectile-likes. In contrast, a flat angular distribution of one-proton stripping channel in $$^{28}$$ Si+ $$^{90}$$ Zr appears to have been caused by a large number of indirect transitions. For two-nucleon transfer, both one-step and two-step processes have been considered. Reasonable reproduction of measured cross sections has been achieved by application of the extreme cluster model for the transfer of a pair of nucleons. No arbitrary scaling of the theoretical results has been necessary and only a minor variation of the binding radius has been allowed in our calculations. More such studies are warranted for mitigating the ambiguities in coupled reaction channel description of multi-nucleon transfer.

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Generation of 1.8-mJ, 2.5-μm, Sub-3-Cycle Laser Pulses via Hollow-Core Fiber Pulse Compression

Generation of 1.8-mJ, 2.5-μm, Sub-3-Cycle Laser Pulses via ...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Song, Huanyu Britton, Mat Larsen, Kirk Kaufman, Brian Gebhardt, Martin Brahms, Christian Travers, John Neuhaus, Marcel Lantigua, Christopher Kincaid, Chelsea Wu, Yi Chini, Michael Chang, Zenghu Robinson, Joseph Cunningham, Eric Forbes, Ruaridh Linac Coherent Light Source SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States School of Engineering and Physical Sciences Heriot-Watt University EdinburghEH14 4AS United Kingdom Institute for the Frontier of Attosecond Science and Technology CREOL Department of Physics University of Central Florida OrlandoFL32816 United States Department of Physics University of Ottawa 25 Templeton Street OttawaONK1N 6X1 Canada

We report on nonlinear compression of 2.5-μm, sub-100 fs laser pulses using a noble-gas-filled hollow core fiber. MgF2 wedges are used to compress the pulse and perform dispersion-scan. Sub-3-cycle, 1.8-mJ pulses are... 详细信息

ISBN: (纸本)9781957171395

关键词： Fiber lasers

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Generation of 1.8-mJ, 2.5-μm, Sub-3-Cycle Laser Pulses via Hollow-Core Fiber Pulse Compression

Generation of 1.8-mJ, 2.5-μm, Sub-3-Cycle Laser Pulses via ...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Nonlinear optics

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A robust bendable IrO_x thin film via mild alkaline solution process for neuron stimulating electrodes

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Surfaces and Interfaces 2024年 44卷

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Tao, Yu-Jen Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Chen, Po-Chun Wu, Pu-Wei Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Nara Ikoma Takayama 8916-5 Japan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei 106 Taiwan National Synchrotron Radiation Research Center Hsinchu 300 Taiwan

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV–Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm²-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2 % of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023 Elsevier B.V.

关键词： Bio-electrode Flexible substrate Implantable electronic devices Iridium dimers Iridium oxide Polyimide

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A Robust Bendable Irox Thin Film Via Mild Alkaline Solution Process for Neuron Stimulating Electrodes

SSRN

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SSRN 2023年

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Pan, Shih-Chin Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Wu, Pu-Wei Chen, Po-Chun Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Takayama Ikoma Nara8916-5 Japan 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

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV-Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm2-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2% of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023, The Authors. All rights reserved.

关键词： Iridium compounds

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