97 research outputs found

    Sdudy on Electroless Deposition of Platinum on Titanium Substrates in Alkaline Bath

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    钛基镀铂已经被广泛应用在航空航天、耐蚀性材料、电解工业、船舶的阴极保护等领域。但对其工艺方面的研究以电镀铂为主,化学镀很少。然而化学镀本身不存在电镀中由于工件几何形状复杂而造成电力线分布不均、均镀能力和深镀能力不足等问题,所以对钛基的化学镀铂研究是必要的。本文在前人工作的基础上,提出把一种碱性化学镀铂浴应用在钛平板和多孔钛板基材的化学镀铂上。通过大量试验对钛基材的镀前处理、化学镀浴各组分的浓度比例、化学镀诱发过程以及镀后的热处理等方面进行了研究,最终在钛基材上获得了结合力良好的镀层,提出了最佳的施镀工艺条件,从而优化了钛基化学镀铂的实际操作过程。 本论文分为四章: 第一章,介绍了钛基镀铂材...The platinum-plated titanium is already widely applied in aviation, corrosion-resistance material, electrolytic industry, ship negative electrode protection and so on. However, the technology about platinum plating on titanium gives first place to electroplating, and reports about electroless plating are very few. However, there many disadvantages which don’t exist in electroless plating in electr...学位:理学硕士院系专业:化学化工学院化学系_物理化学(含化学物理)学号:20042506

    纳米薄层Pt-Ru及Pt-Pd表面合金电极上CO吸附的原位FTIR研究

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    以玻碳为基底 ,通过电化学共沉积的方法制备纳米级厚度的表面合金电极 ,运用电化学原位红外反射光谱研究CO的吸附 .结果表明 ,所制备的PT ru和PT Pd纳米级厚度的表面合金电极均具有异常红外效应 ,即吸附在不同表面位上的CO给出的红外谱峰强度增强 ,其方向与相应金属电极表面获得的谱峰方向相反 .研究还显示PT ru和PT Pd表面合金在电催化和表面研究中的重要意义国家自然科学基金!(批准号:29833060)资助项

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    Controlled Synthesis of Pd and Ag-based Noble-Metal Nanocrystals with High-Energy-Surface and Their Applications

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    贵金属纳米材料因为其独特的物理化学性质以及在催化、燃料电池、光学等方面优异的性能,受到科研工作者广泛的关注。这些性能通常与贵金属纳米晶的表/界面结构密切相关。因此,如何控制贵金属纳米材料的表/界面结构(特别是具有高表面能的表面结构)是调控其性能的关键。此外,通过不同金属间形成的二元或多元的纳米结构,在此基础上调节其表/界面结构、组成等将会进一步提高其性能与实用性。本论文以Pd、Ag这两种贵金属为主要研究对象,从对纳米晶表/界面结构、组成等方面对其进行调控,以改善它们的在催化、光学方面的性能。具体内容和主要研究成果如下: 第一章:简要综述了贵金属纳米晶在不同领域的重要应用,从其基本结构特点...Noble metal nanomaterials have attracted lots of attention due to their unique physical/chemical properties and broad applications in catalysis, fuel cells, optics, etc. It has been demonstrated that the unique properties of noble metal nanocrystals are closely related to their surface/interface structures. Controlled synthesis of noble metal nanocrystals with a specific surface structure, especia...学位:理学博士院系专业:化学化工学院_物理化学学号:2052011015373

    Fabrication, Modification and Photoelectrocatalytic Activity of Hybrid TiO2 Nanomaterials

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    环境污染和能源短缺是21世纪人类面临和亟待解决的重大问题,已成为我国推行全面协调可持续发展的重要制约因素。国际社会越来越多地关注如何利用绿色技术解决环境污染这一世界难题。纳米半导体光催化以其在室温下可直接利用太阳光驱动深度降解反应的独特优点成为当今国内外竞相研究开发并用于环境污染治理的一种重要技术,利用廉价太阳能实现对持久性有机污染物的有效降解是一种极具前途的环境污染深度净化技术,已引起全世界相关领域研究者的广泛重视。纳米TiO2因其具有强氧化活性、良好的光电转换性能、高化学稳定、无毒、廉价等特点,被认为是一种极具发展前景的纳米光催化剂。尽管TiO2光催化技术近几十年已取得长足进步,但仍存在诸...Environmental pollution and energy shortage are two major issues to be solved in the 21st century, becoming the key constraints to implement comprehensive, coordinated and sustainable development in the world. The implementation of green technologies to alleviate the environmental pollution remains a grand challenge and has received increasingly global attention. Due to the unique ability of direc...学位:理学博士院系专业:化学化工学院_物理化学学号:2052012015352

    Study on the Preparation and Performance of of Noble Metals / 2D Nanosheets Hybrid Materials

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    二维纳米材料因其规则的结构,较大的比表面积和独特的性能,引起研究者们的广泛关注。贵金属纳米材料因其表面等离子体效应、量子效应和生物相容性,使其在各个领域都表现出潜在的应用价值。近年来,越来越多的研究者们关注到了二维纳米片与贵金属的复合材料,结合两种材料的优点,设计出具有更加优异性能和广泛用途的复合材料。而二维材料与纳米贵金属复合材料的制备方法上还比较复杂,通常是使用两步法,还要加入还原剂或表面活性剂。本论文介绍了两种制备二维纳米片与贵金属复合材料简单经济的方法:(1)利用硒化铋与氯金酸直接反应得到硒化铋与纳米金的复合材料;(2)通过简单的水热法一步合成氧化钨与纳米铂的复合材料。主要研究结果如下...Two dimensional nanomaterials have received widespread attention in recent years because of regular structure, large surface area and unique properties. At the same time, noble nanomaterials have shown potential applications in various fields due to surface plasma effect, quantum effect and biological compatibility. In recent years, composite nanosheets and noble metals have attracted intense conc...学位:工学硕士院系专业:化学化工学院_化学工程学号:2062014115146

    Controllable Synthesis, Formation Mechanism and Catalytic Properties of Pd-based Noble Metal Nanocrystals

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    贵金属纳米晶体在催化、光学、电子器件和生物医学等领域中有着重要的应用价值,已受到广泛的研究。一般来说,贵金属纳米晶体的性质与其尺寸,形貌及表面结构等特征密切相关。为了提升贵金属纳米晶体在特定应用领域的性能,对贵金属纳米晶体各项结构特征的控制合成一直是近年来的研究热点。尽管研究者对贵金属纳米材料的可控合成已经总结出一些经验和生长机理,但是依然远不能满足基础研究和工业应用的需要,还需要发展更简单高效、机理明确的合成方法,更精确地控制产物的各项结构特性,从而探索其更新更好的性质。 本博士论文选择Pd基贵金属纳米晶体作为主要研究对象,通过对不同结构Pd,Pd@Pt,Pd-Ag纳米晶体及Au胶体晶体的...Noble metal nanomaterials have been widely studied in the fields of catalysis, optics, electronic devices and biomedicine. In general, the properties of noble metal nanocrystals are related to their size, morphology and surface structure. In order to improve the performance of noble metal nanocrystals in a specific application, the controllable synthesis of noble metal nanocrystals with specific s...学位:理学博士院系专业:化学化工学院_物理化学学号:2052010015365

    Advances in Selective Hydrogenation of 5-Hydroxymethylfurfural into 2,5-Dimethylfuran

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    鉴于2,5-二甲基呋喃(dMf)优良的理化性质、重要的应用价值和广阔的市场前景,着重从氢气、甲酸、醇类和水等不同氢供体的角度入手,系统归纳和总结了自2007年以来5-羟甲基糠醛(HMf)选择性加氢制备dMf的催化反应体系及其最新的研究进展,并对今后HMf选择性加氢制备dMf的研究前景进行了展望。The renewable liquid fuel,2,5-dimethylfuran( DMF),which can be produced by the selective hydrogenation of 5-hydroxymethylfurfural( HMF) with high energy density,high boiling point,high octane number,and water insolubility,has attracted more attention all over the world.According to its excellent physicochemical properties,the momentous application values,and the broad market prospects,the various catalytic systems and the latest research progress for the selective hydrogenation of HMF into DMF from the point of the diversity of hydrogen donors such as molecular hydrogen,formic acid,alcohols,and water are systematically summarized.The future research trends are prospected to offer the valuable ideas and advices for the selective hydrogenation of HMF and provide the theoretical references and technical supports for the industrial production and practical application of DMF.淮阴师范学院博士科研启动基金资助项目(31HL001); 江苏省高校自然科学研究面上资助项目(14KJB480002); 国家自然科学基金资助项目(21106121
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