Ziqin Yang

Center for Pain and the Brain

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Teng Tan

Chinese Academy of Sciences

Andong Wu

Institute of Modern Physics

Weiwei Tan

Northwestern Polytechnical University

Guangze Jiang

University of Chinese Academy of Sciences

Xiangyang Lu

Hunan Agricultural University

Shichun Huang

Institute of Modern Physics

Shenghu Zhang

Jiangxi Normal University

Yuan He

University of Chinese Academy of Sciences

Wenlong Zhan

Jiangsu University of Science and Technology

Yujia Yang

École Polytechnique Fédérale de Lausanne

Cooperative Institutions

Chinese Academy of Sciences

138

Institute of Modern Physics

105

University of Chinese Academy of Sciences

Peking University

Fujian Agriculture and Forestry University

Ji Hua Laboratory

Sichuan University

Lanzhou University

Ministry of Agriculture and Rural Affairs

Northwestern Polytechnical University

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Investigation of Oxidation-Resistant Alloy Interconnects for use in Planar SOFC Stacks

Ziqin Yang Matthew Walker Prabhakar Singh Jeffry W. Stevenson

Over the past several years, advances in materials and fabrication techniques for planar SOFCs have allowed for a reduction in SOFC operating temperatures (e.g., 650-800C)[1]. Consequently, relatively inexpensive ferritic stainless steels that have good thermal expansion matching with the ceramic cells are now considered to be among the most promising candidate materials for the construction of interconnects in SOFC stacks. To function well in the stacks, the metallic interconnects must demonstrate: (i) Excellent stability over thousands of hours in a very challenging dual environment, as they are exposed simultaneously to a reducing atmosphere (fuel, such as hydrogen) on one side and an oxidizing atmosphere (air) on the other side; (ii) High electrical conductivity through both the bulk material and in-situ formed oxide scales; (iii) Bulk and interfacial thermal mechanical reliability and durability at the operating temperature; (iv) Compatibility with other materials in contact with interconnects such as seals and electrical contact materials. Our screening work[2-4] has indicated that only few, if any, traditional compositions could completely satisfy the aforementioned materials requirements in the long term. This paper summarizes the results of our evaluation of newly developed alloys and selected oxide-coated stainless steels. In addition, the anomalous oxidation of stainless steelsmore » under the dual environment is also briefly discussed.« less

Oxidizing agent

Operating temperature

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2D SnSe2 micro-flower decorated with 0D In2O3 nanoparticles for low-temperature low-concentration TEA detection

Nano Materials Science (2024)

Lianzhou Wang Jianpeng Li Cheng Xu Ziqin Yang Xiangyun Tan

Triethylamine, a crucial industrial raw material, poses significant threats to both the ecosystem and human health. However, detecting lower concentrations of TEA remains an arduous task. In this study, we report the facile hydrothermal and ultrasonic treatment synthesis of 2D SnSe2 micro-flower modified with 0D In2O3 nanoparticles to form SnSe2/In2O3 heterojunctions for the first time. The SnSe2/In2O3 sensor has a response value of 4.86 for 10 ppm TEA gas at 120 °C, with response and recovery times of 18 s and 79 s respectively, and detection limits as low as 100 ppb. In addition, the SnSe2/In2O3 sensor is essentially unaffected by humidity in the 30% RH to 60% RH range, and the SnSe2/In2O3 sensor response value decreases slightly in the 70% RH to 97% RH range, demonstrating excellent humidity tolerance. More importantly, the sensor maintained excellent cyclic-stability performance during a four-month cyclic stability test. The improved gas-sensitive performance can be attributed to the large number of n-n heterojunctions in the SnSe2/In2O3 material, which enhances the interfacial charge transfer, as well as the active-sites on the material surface. This work serves as a valuable complement to the TEA gas sensor and holds significant potential for detecting low concentrations of TEA at low temperatures in environmental sensing applications.

Triethylamine

Response time

10.1016/j.nanoms.2024.02.010

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Harnessing the potential of human induced pluripotent stem cells, functional assays and machine learning for neurodevelopmental disorders

Frontiers in Neuroscience (2025)

Ziqin Yang Nicole A. Teaney Elizabeth D. Buttermore Mustafa Şahin Wardiya Afshar Saber

Neurodevelopmental disorders (NDDs) affect 4.7% of the global population and are associated with delays in brain development and a spectrum of impairments that can lead to lifelong disability and even mortality. Identification of biomarkers for accurate diagnosis and medications for effective treatment are lacking, in part due to the historical use of preclinical model systems that do not translate well to the clinic for neurological disorders, such as rodents and heterologous cell lines. Human-induced pluripotent stem cells (hiPSCs) are a promising in vitro system for modeling NDDs, providing opportunities to understand mechanisms driving NDDs in human neurons. Functional assays, including patch clamping, multielectrode array, and imaging-based assays, are popular tools employed with hiPSC disease models for disease investigation. Recent progress in machine learning (ML) algorithms also presents unprecedented opportunities to advance the NDD research process. In this review, we compare two-dimensional and three-dimensional hiPSC formats for disease modeling, discuss the applications of functional assays, and offer insights on incorporating ML into hiPSC-based NDD research and drug screening.

10.3389/fnins.2024.1524577

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Plasma cleaning: A new possible treatment for niobium superconducting cavity after nitrogen doping

arXiv (Cornell University) (2015)

Ziqin Yang Xiangyang Lu Datao Xie Lin Lin Kui Zhou

Nitrogen doping treatment with the subsequent electropolishing (EP) of the niobium superconducting cavity can significantly increase the cavity's quality factor up to a factor of 3. But the process of the EP removal may reintroduce hydrogen in the cavity surface, which may influence the cavity's radio frequency performance. Plasma cleaning study on niobium samples with gas mixtures of argon and oxgen intended to remove contaminations (hydrocarbons and micronicdust particles) from cavity surface to avoid field emission, was performed in Peking University. The niobium samples have been analyzed using the time of flight secondary ion mass spectrometry (TOF-SIMS) to measure the depth profiles of H, C, O, F, P and Nb. The measuring results show that the plasma cleaning with gas mixtures of argon and oxgen and conditions of about 20Pa and 100W can remarkably reduce the contents of impurity elements in the depth of about 30 nm without introducing hydrogen in the cavity surface. So plasma cleaning has been proposed to be a new possible treatment for niobium superconducting cavity after nitrogen doping.

Superconducting radio frequency

Electropolishing

Cavity wall

10.48550/arxiv.1508.06353

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Observation and Mechanism of Non-Uniform Distribution of Tin Nuclei in Preparing Vapor Diffusion Coated Nb3sn Thin Film for Srf Applications

Shuai Wu Ye Yang Ziqin Yang Yuan He Jianpeng Li

The attainment of a uniform distribution of tin nuclei on niobium (Nb) surface is a crucial need for the growth of high-quality Nb3Sn thin film for superconducting radio-frequency (SRF) applications using the vapor diffusion method. Studies of the mechanism underlying the observed non-uniform distribution of tin nuclei with tin chloride (SnCl2) have been conducted. The utilization of electron backscatter diffraction (EBSD) analysis enables the examination of the correlation between nucleation behavior and the orientation of niobium grains in the substrate. The findings of the density functional theory (DFT) simulation are in good agreement with the results of the experiment, showing that the non-uniform distribution of tin nuclei is the result of the adsorption energy of SnCl2 molecules by varied niobium grain orientations. Further analysis indicates that the surface roughness and grain size of niobium also play significant roles in the nucleation behavior. This study provides valuable insights into enhancing the surface pretreatment of niobium substrates in the growth of Nb3Sn thin films using the vapor diffusion method.

10.2139/ssrn.4665372

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Understanding and optimization of the coating process of the radio-frequency Nb3Sn thin film superconducting cavities using tin vapor diffusion method

Applied Surface Science (2023)

Guangze Jiang Shuai Wu Ziqin Yang Yuan He Yang Ye

10.1016/j.apsusc.2023.158708

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Investigations Towards Nanoscale Precise Polishing of Nb3sn Thin Films for Srf Applications

Shuai Wu Ye Yang Ziqin Yang Yuan He Tao Liu

Download This Paper Open PDF in Browser Add Paper to My Library Share: Permalink Using these links will ensure access to this page indefinitely Copy URL Copy DOI

10.2139/ssrn.4727420

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Direct Observation of Hydrides Formation of Nitrogen Doping Nb Samples

18th Int. Conf. on RF Superconductivity (SRF'17), Lanzhou, China, July 17-21, 2017 (2018)

Ziqin Yang Xiangyang Lu Weiwei Tan Deyu Yang Yujia Yang

10.18429/jacow-srf2017-thpb030

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SOFC Interconnect and Compressive Seal Development at PNNL

Yeong‐Shyung Chou Ziqin Yang Prabhakar Singh Jeffry W. Stevenson Gordon Xia

The development of solid oxide fuel cell (SOFC) technology represents an opportunity to achieve significant improvements in energy conversion efficiency and reduction of undesirable emissions. However, many technical challenges still need to be overcome before the utilization of the advantages of SOFC can take place. These challenges include the need for improved interconnects and seals for planar SOFC stacks. In this paper, we briefly summarize recent progress at PNNL in these two research areas.

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Low-Temperature and High-Sensitivity Au-Decorated Sno2 Sensor for Ethanol Detection

Jianpeng Li Li Wang Cheng Xu DiDi Luo Baoyu Huang

The nanostructures of oxides decorated with noble metals have been used to detect ethanol at low temperature with high sensitivity. Instead of traditional thick ones, this work explored the ultrathin SnO2 nanotubes (NTs) decorated with Au nanoparticles (NPs) for chemical gas sensors. The field-emission scanning electron microscopy and field-emission transmission electron microscopy characterized the SnO2 NTs and Au NPs with uniform structures. After that, the X-ray diffraction, X-ray photoelectron spectroscopy and base resistance test proved the existence of the Schottky junction. Then, the gas-sensing test results show that the gold-modified SnO2 NTs sensor has excellent sensing properties such as low operating temperature (25 °C), high sensitivity (Response value of 192 at 160°C), low detection limit (1 ppm), good selectivity for ethanol, and high stability. This study presents a novel approach for gas sensing using ultrathin SnO2 NTs decorated with Au NPs, which has demonstrated excellent sensing properties. The results of this study provide a foundation for further research and development of highly efficient gas sensors for various applications.

10.2139/ssrn.4486634

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