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Janus-TiNbCO2 for Hydrogen Evolution Reaction with High Conductivity and Catalytic Activity
No full text探寻具有高导电性和高催化活性的析氢反应（HER）催化材料一直是可持续能源发展研究中的热点。Ti2C具有表面活性位点多和优良的力学稳定性、导电性等,已成为潜在的制氢催化剂。然而,终端O修饰Ti2C表面,会降低该材料的导电性,进而限制了电子在价带与导带间的输运。本研究通过Nb掺杂,构建双电层Janus-TiNbCO2,并借助VASP软件研究了Janus-TiNbCO2的能带结构、HER性能和HER反应路径过渡态。结果表明,Janus-TiNb-CO2为导体材料,其在应力、氧空位缺陷和H*覆盖度的影响下,均表现出极优异的催化活性,计算获得的最优ΔGH*值为0.02 eV。H*在Janus-TiNbCO2上可能以Heyrovsky路径进行反应,该路径的迁移能势垒为0.23 eV。Janus-TiNbCO2是一种具有HER应用前景的催化材料。Exploring the potential hydrogen evolution reaction (HER) catalysts with the high activity and high conductivity has always been a hot spot in the research of renewable energy development. Ti2C, as one of the 2D-MXene, has excellent properties relating to many active sites, mechanical stability, conductivity, etc., and has become a potential HER catalyst. However, the modification of the surface of Ti2C by terminal O will reduce the conductivity, thereby limiting the transport of electrons between the valence band and the conduction band. In this study, an electric double layer Janus-TiNbCO2 was constructed by Nb doping. The band property, HER activity and HER reaction path of Janus-TiNbCO2 are studied by the first-principles calculations. The results show that Nb doping increases the distance between Ti and O atoms, which increases the lattice parameters of Janus-TiNbCO2 comparing with that of Ti2CO2 structure. The Janus-TiNbCO2 structure is stable by calculating the thermodynamic stability at 500 K using AIMD method. The band gap of Ti2CO2 is approximate 0.9 eV. After Nb doping, the orbital hybridization between Nd-3d and O-2p affects the electronic rearrangement of Ti-3d, leading that Janus-TiNbCO2 has the metal band structure. In Janus-TiNbCO2, both Ti and Nb surfaces adsorb H* by O site, where the ΔGH*(@Ti) = -0.55 eV,ΔGH*(@Nb) = 0.02 eV, showing Ti and Nb surfaces have different catalytic activities. Comparing with graphenes, e.g., h-B2O, Pt, and g-C3N4, Janus-TiNbCO2 has better catalytic activity. The charge distribution of Janus-TiNbCO2 near the Fermi level was analyzed by HSE-06 function. The result reveals that O atoms on the Ti surface exhibit charge unsaturation at the Fermi level, while those on Nb surface strong saturation. Moreover, the effects of H* coverage and strains(+2% ~ +4%) on the catalyst activity of Janus-TiNbCO2 are studied. When the H* coverage is low, the optimal ΔGH* of Nb surface is approximate 0.02 eV, while Ti surface has an excellent catalytic activity at high H* coverages (θ = 7/9, ΔGH* = -0.06 eV). Under the strain action, the H* coverage on surface is not affected. However, strains will reduce the HER activity of Nb surface, and increase the HER activity of Ti surface. Furthermore, oxygen defect is a stable point defect in Janus-TiNbCO2 . Oxygen defect will increase the HER activity of Ti surface and decrease the HER activity of Nb surface. Comparing to the Tafel pathway, the Heyrovsky is a more suitable pathway for the HER, in which the migration barrier of Heyrovsky is 0.23 eV for H* on Nb surface. Janus-TiNbCO2 can be used as a potential HER catalyst.国家自然科学基金项目(12105236)通讯作者:徐黎黎,赵骁锋E-mail:[email protected];[email protected]:Li-LiXu,Xiao-FengZhaoE-mail:[email protected];[email protected].绵阳职业技术学院,材料工程系,四川 绵阳 6210002.西南科技大学,材料科学与工程学院,四川 绵阳 6210103.乌普萨拉大学,物理与天文学系,瑞典 乌普萨拉SE-751201. Mianyang Vocational and Technical College, Department of Materials Enginerring, Mianyang 621000, Sichuan, China2. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China3. Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Swede
Fundamentals of Electrochemical Impedance Spectroscopy for Macrohomogeneous Porous Electrodes
No full text电化学阻抗谱可用于诊断多孔电极内电荷转移反应,即界面电荷集聚和电荷传导,以及反应物质输运。本文采用复相量方法,在同态假设条件下,重新推演多孔电极阻抗谱模型,厘清传统多孔电极阻抗谱模型中的模糊性表述。(1) 定义多孔电极表征输入参数,包括电极基体电子电导率σ1 、电解质离子电导率σ2、界面电荷传递电导率gct、单位面积界面电容C、固相扩散系数D、速度常数k、电极厚度d、特征孔深Lp 和单位体积表面积Sc;(2) 解析阻抗谱特征输出参数,包括场扩散常数K,特征频率ω0、ω1、ω2、ω3和 ωmax,它们分别相关于界面传导反应、有限场扩散、氧化还原反应、孔内扩散和最小特征孔尺寸,以及分别对应于从传导到扩散和从扩散到饱和的转折频率fk1 和fk2;(3) 当参数X和Z同时变化时(X = σ1和Z = d,Sc,Lp,C,gct,D,k),通过阻抗谱特征参数的演变规律,分析了电荷转移反应中X和Ζ参数耦合竞争;(4)为深入分析电荷转移反应中参数X和Z的耦合竞争,引入了分叉频率fXZ和fZX 。fXZ和fZX所处位置可以用于表征参数X和Z影响电荷转移反应的深度和广度。当分叉频率fXZ和fZX不存在时,表明电荷转移反应中参数X和Z在全频率范围内存在耦合竞争。总之,借助于特征频率和分叉频率,本文一方面研究了动力学参数和微观结构参数对多孔电极中电荷转移反应的影响,另一方面分析谱图的变化及其背后的阻抗谱特征演化规律。本文研究结果可为阻抗谱的系统仿真和辨识提供理论基础,可为多孔电极内电荷转移反应的竞争分析提供技术支撑,还可为电化学储能系统的优化设计提供诊断工具。Electrochemical impedance spectroscopy (EIS) can be used to diagnose charge transfer reactions and mass transport in porous electrodes. The charge transfer reactions include interfacial charge accumulation and charge conduction as well as electrochemical reaction. In this paper, the complex phasor method is developed under the macrohomogeneous assumption to build an impedance model of porous electrodes for clarifying several vague expressions in the traditional approaches. The following researches are carried out: (1) Identifying characteristic parameters for the porous electrodes, including electrode electronic conductivity σ1, electrolyte ionic conductivity σ2, interface charge transfer conductivity gct, unit area interface capacitance C, solid phase diffusion coefficient D, rate constant k, electrode thickness d, characteristic hole depth Lp and unit volume surface area Sc ; (2) elucidating characteristic output parameters for the impedance spectroscopic response, including field diffusion constant K, characteristic frequencies ω0, ω1, ω2, ω3, and ωmax for interface conduction reaction, finite field diffusion, redox reaction, pore diffusion and minimum characteristic pore size, respectively. In addition, the transition frequencies fk1 and fk2 from conduction to diffusion area and from diffusion to saturation area are also defined and studied respectively; (3) defining the parameters X and Z, herein, X = σ1,Z = d、Sc, Lp , C, gct , D, k,which are responsible for the evolution trend of the characteristic parameters for impedance spectroscopic response, the competition effects of X and Z parameters coupled in charge transfer reaction are analyzed; (4) Further analyzing the competition effects of X and Z parameters coupled in the charge transfer reaction, the diverging frequencies fXZ and fXZ are phenomenologically defined. The locations of fXZ and fXZ can indicate the depth and breadth of the charge transfer reaction affected by the parameters X and Z. The non-existence of fXZ and fXZ indicates that the parameter X or Z can affect the charge transfer reaction over the whole frequency range. With the help of characteristic frequency and diverging frequency, the effects of electrode kinetic and microstructure parameters on the charge transfer reaction in porous electrodes are studied; on the other hand, the shape change and trend evolution of the impedance responses for porous electrodes are analyzed. The research results in this paper should be able to provide theoretical basis for system simulation and system identification of impedance spectroscopy, technical support for competitive analysis of charge transfer reaction in porous electrodes, and diagnostic tool for optimal design of electrochemical energy storage system.国家自然科学基金项目(22078190)通讯作者:黄秋安,王娟,张久俊E-mail:[email protected];[email protected];[email protected]:Qiu-AnHuang,JuanWang,Jiu-JunZhangE-mail:[email protected];[email protected];[email protected].西安建筑科技大学,陕西省纳米材料与技术重点实验室,陕西 西安 7100552.上海大学可持续能源研究院,上海 2004441. Shanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi,China2. Institute for Sustainable Energy, Shanghai University, Shanghai 200444, Chin
Preparation of PdCoIr Tetrahedron Nanocatalysts and Its Performance toward Ethanol Oxidation Reaction
Full text link钯(Pd)基催化剂是直接乙醇燃料电池研究中广泛使用的催化剂,进一步提升其性能是推动燃料电池发展的重要方向。本文用一步水热法制备出四面体结构PdCo(PdCo tetrahedron,记为PdCo-TH)和少量铱(Ir)掺杂的PdCo四面体合金纳米粒子(记为PdCoIr-TH)。经TEM、ICP、XPS及CV等表征证实,PdCoIr-TH为三元合金纳米粒子,且掺杂的Ir元素倾向分布在催化剂表层。相比于商业Pd/C催化剂,PdCo-TH/C和PdCoIr-TH/C对乙醇电氧化的催化性能显著增强。研究结果表明,Pd9Co1Ir0.1-TH/C在低电位(< -0.25 V)下具有最高的乙醇电氧化活性和稳定性。Ir掺杂不仅提高了催化剂抗CO毒化的能力还有利于乙醇起始氧化电位负移。同时,随着Ir含量的增加,所制备的纳米催化剂的乙醇电氧化C1产物选择性也随之升高。针对不同组成催化剂反应性的差异,本文认为Co与Ir位点上容易产生OHad物种,这将有利于活性Pd位点上乙醇电氧化中间反应物种的有效转化。除了以上的各位点间的协同效应,三元合金的形成,进一步调控了Pd的d带电子结构,从而促进了催化剂反应性的改变。As a new energy conversion device, direct ethanol fuel cells (DEFCs) are widely concerned because of their remarkable advantages such as high theoretical energy density and wide fuel sources. However, the rapid development of DEFCs has been severely impeded due to the sluggish kinetic process and toxic intermediates especially in their anodic reactions. Palladium (Pd)-based materials are considered to be excellent anode catalysts for DEFCs, especially under alkaline conditions. And further improving their performance is an important direction to promote the development of DEFCs. Surface structure and composition are the key factors affecting the performance of catalysts which can be improved by reasonable regulation. It is reported that high-index faceted structures and element doping are beneficial to improve the performance of catalyst. In this work, the advantages of these two strategies were used comprehensively to prepare Pd-based catalysts with high efficiency. Palladium cobalt (PdCo) and Ir-doped PdCo tetrahedron alloy nanocatalysts (denoted by PdCo-TH and PdCoIr-TH, respectively) have been successfully prepared by one-step hydrothermal method. The characterization results of TEM, ICP, XPS and CV show that the PdCo-TH binary and PdCoIr-TH ternary alloys were formed, while Ir element was mainly distributed on the PdCoIr-TH surface. Compared with the commercial Pd/C, the PdCo-TH/C and PdCoIr-TH/C exhibited the enhanced catalytic properties toward ethanol oxidation reaction in alkaline solutions. Particularly, the Pd9Co1Ir0.1-TH/C catalyst showed the best activity and stability toward EOR, especially at low potentials (< -0.25 V). And Ir sites not only resisted CO poison effectively, but also shifted the initial oxidation potential of ethanol negatively. Meanwhile, the selectivity of C1 products during the electrocatalytic oxidation of ethanol has been greatly improved with the increase of Ir content. The enhanced reactivities of PdCo-TH/C and PdCoIr-TH/C could be attributed to: (a) The coexistence of Co sites and Ir sites on the surfaces can generate OHad species which can promote the oxidation of intermediate adsorbed species on Pd sites and (b) the negative shift in electron binding energy of Pd due to the addition of Ir may make reaction intermediates desorb more difficultly, which might make the reactivity of PdCoIr-TH/C differ from that of PdCo-TH/C. This research work has demostrated a strategic approach for future development in high efficiency catalysts used for DEFCs.国家自然科学基金项目(21802112);国家自然科学基金项目(21773198)通讯作者:黄蕊,孙世刚E-mail:[email protected];[email protected]:RuiHuang,Shi-GangSunE-mail:[email protected];[email protected]厦门大学化学化工学院,固体表面物理化学国家重点实验室,福建 厦门 361005State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, Chin
Research Progress in Electrodeposition Technology of Titanium-Based Iridium Oxide Electrode
Full text link钛基氧化铱电极作为DSA(dimension stable anode)中的典型电极,广泛应用于各个领域。目前工业生产的钛基氧化铱电极主要由传统热分解法制备,存在成本高昂,工艺繁琐,依赖人工劳动,无法大规模生产等问题,十分有必要探索开发新的制备技术。本文从沉积液配方、基底材料的选择及处理、电沉积方式以及沉积时间等方面系统地讨论了氧化铱电沉积制备技术的研究进展,包括作者课题组所作的一些工作及成果;分析了钛基氧化铱电极电沉积制备技术目前所面临的挑战,并给出一定建议;阐述了其应用前景,展望了其未来发展方向,希望更多的科研人员能投入到相关研究中。Titanium-based iridium oxide electrode has been widely used in various fields, such as electrocatalytic oxidation, biomedical applications, hydrometallurgical metal recovery, electro-osmotic dewatering, etc. At present, it is mainly prepared by traditional thermal decomposition method, however, which has high cost, cumbersome process, mainly relying on manual labor and cannot be mass-produced yet. It is, therefore, urgently necessary to explore new preparation technologies by focusing on electrodeposition technology, with technological characteristics such as eco-friendly and sustainable development. This article systematically discusses the research progress in iridium oxide electrodeposition preparation technology from the aspects of deposition solution formulation, base material selection and treatment, electrodeposition method and deposition time, etc. Some works and achievements, made by the author's research group, such as a new electrodeposition recipe of titanium-based iridium oxide electrode and the pretreatment of titanium with anodic oxidation for improving the stability of electrodeposited IrO2 electrode are also presented. The current challenges faced by the electrodeposition preparation technology of titanium-based iridium oxide electrode, including bad coating quality, weak bonding ability between coating and substrate, lack of the study on the theory about dynamic of electrodeposition and the problem of industrial applications are analyzed. Based upon the aforementioned challenges, some suggestions, for example, utilizing optimization of the electrodeposition, multi-deposition process combination, metal (such as tantalum, lanthanum) co-deposition, are given to solve for the problem of coating quality. The process of electrodeposition by utilizing in-situ electrochemical methods, and combined with COMSOL and other software to simulate the process, and then starting from both electrochemical theory and crystal growth theory, as well as the gradually perfect the theoretical research on electrodeposition of iridium oxide on titanium are summarized. Finally, the application prospects and future development directions are highlighted. It is expected that this brief review would offer critical insights and useful guidelines for developing superior electrodeposition technology of titanium-based iridium oxide electrode.通讯作者:吴旭E-mail:[email protected]:XuWuE-mail:[email protected]华中科技大学环境科学与工程学院,湖北 武汉 430074College of Environmental Science and Engineering, Huazhong University of Science and Technology ,Wuhan 430074, Hubei, Chin
SNX14 deficiency-induced defective axonal mitochondrial transport in Purkinje cells underlies cerebellar ataxia and can be reversed by valproate
Full text link共济失调是一类以运动协调性紊乱为主要特征的神经系统症状，临床表现包括步态不稳、丧失平衡、吞咽困难、眼球运动异常、肌张力受损等。厦门大学医学院神经科学研究所王鑫教授团队首次从轴突线粒体运输这一全新视角揭示了一类遗传性共济失调的发病机制，并发现抗癫痫药--丙戊酸大幅度减缓模型小鼠的疾病进程，具有较强的转化应用价值，有望为共济失调提供新的治疗手段。
该研究工作由王鑫教授指导完成，厦门大学医学院助理教授张洪峰和博士生洪育娟共同完成主要实验工作。Loss-of-function mutations in SNX14 cause autosomal recessive spinocerebellar ataxia 20, which is a form of early-onset cerebellar ataxia that lacks molecular mechanisms and mouse models. We generated Snx14-deficient mouse models and observed severe motor deficits and cell-autonomous Purkinje cell degeneration. SNX14 deficiency disrupted microtubule organization and mitochondrial transport in axons by destabilizing the microtubule-severing enzyme spastin, which is implicated in dominant hereditary spastic paraplegia with cerebellar ataxia, and compromised axonal integrity and mitochondrial function. Axonal transport disruption and mitochondrial dysfunction further led to degeneration of high-energy-demanding Purkinje cells, which resulted in the pathogenesis of cerebellar ataxia. The antiepileptic drug valproate ameliorated motor deficits and cerebellar degeneration in Snx14-deficient mice via the restoration of mitochondrial transport and function in Purkinje cells. Our study revealed an unprecedented role for SNX14-dependent axonal transport in cerebellar ataxia, demonstrated the convergence of SNX14 and spastin in mitochondrial dysfunction, and suggests valproate as a potential therapeutic agent.We thank Tim Huang for helpful discussion, Wei Mo for sharing mouse lines, Li Zhong
for sharing reagents, Aidong Han, Luming Yao, Caiming Wu, Mingxia Zhu, Qingfeng
Liu, Lin Zhu, Shuo Zhang, Haiping Zheng, and Changchuan Xie for technical
assistance, and Cui Li for providing bioinformatics software. We also thank Novogene
Co., Ltd. and PTM Biolab Co., Ltd. for technical assistance in the transcriptomic and
proteomic analyses, respectively.
厦门大学医学院许华曦、赵颖俊、张云武、杜丹教授在研究过程中给予大力帮助和支持。本研究工作得到国家重点研发计划项目、国家自然科学基金、福建省自然科学基金、厦门大学校长基金的资助和支持
Concentration of Srppliers and Enterprise Labor Investment A Study from the Perspective of Labor and Finance
No full text李小荣，中央财经大学财政税务学院教授、博士生导师，管理学博士，中财-中证鹏元地方财政投融资研究所研究人员；张丽男，中央财经大学财政税务学院博士研究生。【中文摘要】当前，劳动力已成为企业的重要资产，研究企业劳动力投资的影响因素并优化劳动力配置富有理论和现实意义。从供应商-客户关系视角探究企业劳动力投资的影响因素以及供应商集中度影响企业劳动力投资的作用机制,实证研究发现:供应商集中度越高,企业的劳动力投资规模越小;企业融资约束更严重（或风险更高）时,供应商集中度与企业劳动力投资规模的负相关关系更强，而且供应商集中度越高，企业的融资约束越严重、企业风险水平更高，说明融资约束和企业风险是供应商集中度影响企业劳动力投资的两种作用机制。此外，基于供应商集中度对企业劳动力技能的影响进行研究，发现供应商集中度的增加会减少各类技能的劳动力投资规模。
【Abstract】The labor force represents a vital asset of enterprises. As such，it is of theoretical and practical significance to study the effect factors of labor investment and optimize the labor force. From the perspective of supplier-customer relationship，this paper discusses what factors affect enterprise labor investment and in what ways these factors influence enterprise labor investment. Empirical research shows that ：the higher the concentration of suppliers，the smaller the scale of labor investment; and the more serious the financial constraints of enterprises，the stronger the negative correlation between the concentration of suppliers and the scale of labor investment. When the risk of enterprises goes higher，the negative correlation between the concentration of suppliers and the scale of labor investment becomes stronger. Moreover，the higher the concentration of suppliers，the more serious the financing constraints and the higher the level of enterprise risk. The foregoing results suggest that financing constraints and enterprise risk are two mechanisms that influence the labor investment of enterprises through the concentration of suppliers. Furthermore，by studying the impact of the concentration of suppliers on enterprise labor skills，this paper finds that the increase of supplier concentration will reduce the scale of labor investment for various skills.国家自然科学基金项目“利率市场化与企业劳动力投资：影响、作用机制与综合效果”（71972192)；教育部霍英东教育基金会资助项目“CEO权力、股价崩盘风险与股价同步性”(161077
Research and Application of Copper Electroplating in Interconnection of Printed Circuit Board
No full text电镀铜技术是制造印制电路板、封装载板等电子互连器件的核心技术。本文介绍了印制电路中电镀铜技术及其发展概况,主要总结了电子科技大学印制电路与印制电子团队在印制电路电镀铜技术基础研究和产业化应用等方面的工作。首先,以三次电流分布理论为基础,采用多物理场耦合方法构建阴极表面轮廓线随时间变化的镀层生长过程模型。该模型描述了铜沉积与微纳孔结构、添加剂特性、输入电流、对流强度等相关影响因素的函数关系。通过引入添加剂相关函数,该模型能够较好应用到整平剂筛选和性能评价、电镀铜需求和镀液配方匹配、电镀参数优化等技术开发和应用领域。然后,介绍了添加剂竞争吸附过程的电化学研究以及利用传质调控添加剂局域浓度实现快速微盲孔、微沟槽填充的工业技术。之后,介绍了氮杂环低聚物系列整平剂结构-电化学构效关系研究和应用。最后展示了氧化还原型添加剂的开发情况,并对印制电路中电镀铜技术的研究和应用发展进行了预测。Copper electroplating is the key technology for manufacturing of integrated circuit, packaging substrate, printed circuit board, and other electronic interconnection components. However, the electrochemistry and mechanism of deposition growth have not been fully elucidated, and the development of additives and bath maintenance are inseparable from a large number of experiments. This article reviews recent fundamental research and application progress in copper electroplating for printed circuit board industry, and these works are mainly dedicated by the research group of Printed Circuit and Printed Electronics from University of Electronic Science and Technology of China. First of all, a brief history of copper plating in printed circuit board is given. Then, modeling and simulation studies are introduced. A multi-physics coupling model is built on the basis of an electroplating bath, and an additive related parameter is introduced into the model to connect the convection intensity and the voltammetric response of the electrolyte. Base on tertiary current distribution, a relational model with the growth process of cathode surface related to micro-scale hole structure, plating current, convection intensity, additives etc., is obtained. Some applications using the above model are presented successively. By simplifying this model, a fast electrochemical evaluation method is developed to screen leveler candidates. Two dependent indicators, polarization overpotential of leveler injection (Δη) and deposition potential difference with low and high convection (ΔEr), are introduced, and the chemical having both high Δη and Δ Er may be an appropriate leveler. Fix the parameters of plating conditions and set TP as the index, the additive related parameter, size and structure of micro-scale hole are varied. It is feasible for a specific copper electroplating application couple to an appropriate additives’ pack. Then, a multi-physics modeling helping to optimize plating parameters of fine circuit pattern plating to meet the requirement of high thickness uniformity over the whole board has been demonstrated. Secondly, the mechanism of competitive adsorption of the organic additives has been discussed from the electrochemical results. The adsorption amount of the accelerator is independent of solution convection, but it shows dependency on the suppressor, and the adsorption strength of the accelerator is weaker than that of the suppressor. From that, a fast via-filling process is developed. Molecules of accelerator are selectively replaced from board surface but remained on via bottom by a mass-transport controlled pre-dip step of oxidant or suppressor, and the plating time of via filling is significantly shortened. Thirdly, the structure-electrochemistry relationship of series nitrogen heterocyclic oligomers is studied, and applications of the levelers and redox additive are discussed. Finally, a prospect on the research and application of copper electroplating has been made.国家自然科学基金项目(61974020);珠海市引进创新团队项目(ZH0405190005PWC)通讯作者:王翀,何为E-mail:[email protected];[email protected]:ChongWang,WeiHeE-mail:[email protected];[email protected].材料与能源学院,电子科技大学,四川 成都 6100542.重庆市高校新型储能器件及应用工程研究中心,重庆文理学院,重庆 4021603.珠海方正科技高密电子有限公司&珠海方正科技多层电路板有限公司,广东 珠海 5191751. School of Materials and Energy, University of Electronic Science and technology of China, Chengdu 610054, Sichuan, China2. Engineering Research Center of New Energy Storage Devices and Application, Chongqing University of Art and Science, Chongqing 402160, China3. Zhuhai Founder Tech. Hi-Density Electronic Co., Ltd. & Zhuhai Founder Tech. Multilayer Circuit Board Co., Ltd, Zhuhai 519175, Guangdong, Chin