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原位衰减全反射表面增强红外光谱实验技术 总被引:1,自引:0,他引:1
介绍了原位研究电极,溶液界面反应的技术--衰减全反射表面增强红外光谱实验技术(ATR-SEIRAS)的产生背景和工作原理,重点描述了ATR-SEIRAS实验技术的关键:光谱电化学池的构造和薄膜电极的制备.与IRAS相比,ATR-SEIRAS技术可以更容易消除溶剂的背景吸收,获得较高的表面灵敏度,而且允许物质在电极表面自由扩散.与循环伏安相结合,利用ATR-SEIRAS技术可以实时监测电极,溶液界面问的反应.选择了利用ATR-SEIRAS实验技术原位研究功能表面的构造和性质、分子识别和反应中间体的形成等方面的应用实例,分析了ATR-SEIRAS实验技术的研究方向. 相似文献
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应用现场表面增强拉曼光谱和衰减全反射表面增强红外光谱初步研究了0.1mol·L-1HClO4溶液中Pt电极表面铁原卟啉(FePP)自组装单层的电化学和结构特性.以514nm波长为激发线,得到了增强因子约为40的粗糙Pt电极上FePP在不同电位下的表面增强拉曼光谱.分析0.5~-0.3V(SCE)区间内谱峰变化,得到近似的吸附等温式,由此可估算出Fe3+/Fe2+的式量电位大约为-0.2V.原位表面增强红外光谱的测试结果表明,FePP分子主要以斜立方式吸附在Pt膜电极表面,其中一个环外羧酸根与电极表面相接触,而另一羧酸基团以氢键与相邻的FePP分子相连.这样的吸附结构在-0.1~0.9V(SCE)的电位区间内并没有显著的变化. 相似文献
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现场显微红外光谱电化学技术及超微铂盘电极的反射吸收光谱测定 总被引:1,自引:1,他引:0
本文阐述了一种新的光谱电化学技术-现场显微红外光谱电化学法的反射式方法的技术特点和优势,报告了一种适于水溶剂和非水溶剂的反射式现场显微红外光谱电化学池的设计,并首次在25um直径的超微铂盘工作电极上,对Fe(CN)^4-6/FE(CN)^3-6进行了现场显微红外光谱电化学的测量。 相似文献
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经历两个多世纪的发展,电化学表征方法的理论和实验研究不断完善,在表界面精细结构表征、电化学反应机理研究等方面起到重要作用。电化学谱学表征技术的出现,填补了传统电化学表征方法在分子水平上鉴定电化学反应活性位点及中间物种的空白。本文总结了近年来红外光谱(IR)、表面增强拉曼光谱(SERS)及和频振动光谱(SFG)三种经典分子振动光谱电化学表征技术的研究进展。首先介绍了三种光谱的基本原理和电化学联用电解池的设计,然后从基础电化学理论出发,介绍其在模型单晶体系及界面水机理研究中的应用,进一步重点介绍了其在锂离子电池和燃料电池领域的相关研究进展,最后展望了电化学谱学表征技术的未来发展方向。 相似文献
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以碳酸丙烯酯(PrC)为溶剂,高氯酸四丁基胺(TBAP)为电解质,利用电化学及红外光谱电化学开展了金电极上二氧化碳的还原研究。运用现场红外光谱跟踪电化学还原过程反应物及产物的生成和消失。红外光谱电化学循环伏吸法表明,在消耗CO2的同时,金电极上有CO的产生,且伴随有碳酸根的形成。结合电化学和光谱电化学结果,提出了一种电还原机理:在非水介质中,CO2电还原过程中生成了中间体CO2.-,随后CO2.-分别以两个途径进行还原,其一是直接被还原成CO,其二是与CO2结合生成C2O4.-而后歧化成CO以及CO32-。两个反应同时进行,且第一个反应是可逆过程。 相似文献
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本文通过硫脲在银电极上吸附和正丙醇在铂电极上氧化的两个具体实例,简要介绍表面增强拉曼散射和红外反射光谱的教学实验内容。 相似文献
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Rapidprogressinthetheoryofquantumreactivescatteringhasbeenmadeinthepastfewyears.Asaresultoftheprogressonecannowcalculateexactstate_tostatereactioncrosssectionsforafewfundamentalreactions.Amongvariousformulationsofthetheoreticalapproach,theSmatrixKohnv… 相似文献
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A time-dependent quantum wave packet method was used to study the dynamics of dissociative adsorption of H2 and D2 on a flat and static surface. The molecule-surface interaction is described using a modified London-Eyring-Polanyi-Sato (LEPS)
type potential for the H2/Ni(100) system. The three-dimensional (3-D) dissociation probabilities were calculated for different initial rovibrational
states as a function of initial incident energies. Our results show that the dissociation of the diatomic rotational states
whose quantum numbers satisfyj+m = odd is forbidden at low energies for the homonuclear Hz and D2 due to the selection rule. The effect of the rotational orientation of diatoms on adsorption predicts that the in-plane rotation
(m = j) is more favorable for dissociation than the out-of-plane rotation (m = 0). Enhanced dissociation for vibrationally excited molecules and the significant enhancement of the dissociation probability
of H2 when compared to D2 were explained reasonably in terms of quantum mechanical zero-point energies, the tunneling effect and the reflection from
an activation barrier.
Project supported by the National Natural Science Foundation of China (Grant No. 19694033) and partially by the Science Foundation
for Overseas Chinese Scholars and Students, administered by the State Education Commission of China (Grant No. 1992), by the
State Key Laboratory of Theoretical and Computational Chemistry of Jilin University at Changchun (Grant No. 98011, and by
the Natural Science Foundation of Shandong Province (Grant No. Y96B03022) 相似文献
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China is rich in rare earth resources. Rare earth elements, also named lanthanides, are number 58 to number 81 elements in the elemental periodic table. They have unique electronic structures and may form various coordination compounds. In the early 1960s, researchers at the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (CIAC) found the catalytic activities of lanthanide compounds in stereospecific polymerization of conjugated dienes, and published the first paper on this topic in 19... 相似文献
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DONG De-ming ** ZHANG Jing-jing LI Yu ZHANG Jun-zhi HUA Xiu-yi YANG Fan College of Environment Resources Jilin University Changchun P. R. China 《高等学校化学研究》2004,20(1):29-31
IntroductionSurfacecoatingsaccountforawiderangeofmi crobialorganismsontheearth[1] ,formonthevarioussurfacesundervariedconditions ,andcoverthesur facesofallthematerialsinrivers,lakes ,andwet lands ,suchasrocksandsediments[2 ] .Theyplayadominantroleindeterminingthetransportandulti matefateofcontaminantsinnaturalaquaticenviron ment,whichisduetoinpartthatcontaminantsmustreachandcrosssurfacecoatingsbeforetheycontactthesubstrates[3] .Ithasbeenprovedthatamongthemaincomponentsinsurfacecoatings,mangane… 相似文献
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大型仪器公共技术服务中心管理经验介绍 总被引:2,自引:2,他引:0
赫明佳 《分析测试技术与仪器》2016,(2):124-127
结合中国科学院长春应用化学研究所公共技术服务中心建设情况,从运行管理模式、大型仪器设备共享措施、科技支撑队伍建设等方面介绍了中心如何推动大型仪器设备开放共享工作. 相似文献
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Nanocrystalline titanium oxide thin films have been successfully deposited on IT0 coated glass by pulsed laser ablation of
metallic Ti target in 03/02 ambient gases. The intercalation of Li ions in the anatase TiO2 film electrode is examined by cyclic voltammetry. The electrochromic behaviour of TiO2 electrode is investigated byin-situ visible transmittance measurement, and two absorption bands at 420 and 650 nm are observed. The absorption falling and rising
in color changing with excellent revisibility is relative to the insertion and deintercalation processes of Li ion. These
results suggest that nanocrystalline titanium oxide films fabricated by pulsed laser deposition exhibit excellent spectroelectrochemical
property.
Project supported by the National Natural Science Foundation of China (Grant No. 29783001) and State Key Laboratory for Physical
Chemistry of Solid Surface of Xiamen University (1997). 相似文献
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喜逢中国科学院长春应用化学研究所建所70周年华诞之际,真诚感谢安立佳院士作为客座编辑邀请国内化学相关领域著名院士和专家出版这一期纪念刊专辑。《应用化学》创刊于1983年,为中国科学院长春应用化学研究所的发展和国内相关化学领域提供了一个学术交流的平台,始终秉持“应用化学,追求卓越”的办刊理念,面向科研单位、大专院校和化学化工领域的科研及技术人员,着重报道化学及交叉学科有应用前景的创新性基础科学研究和创造性科研技术成果,介绍该领域中的新发现、新理论、新方法、新技术、新产品及相关科技信息,为推动应用化学学科的发展、加强国内国际间的学术交流、人才培养和现代化建设服务。该专辑的出版必将对该领域的发展起到重要的促进作用。 相似文献
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A dynamical Lie algebraic method has been applied to treating the quantum dynamics of dissociative adsorption of H2 on a static flat metal surface. An LEPS potential energy surface has been used to describe the interaction of H2 with Ni(100) surface. The dependence of the initial state-selected dissociation probability was obtained analytically on
the initial kinetic energy and time. A comparison with other theoretical calculations and experiments is made. The results
show that the method can be effectively used to describe the dynamics of reactive gas-sdace scattering.
Project supported by the National Natural Science Foundation of China (Grant No. 19694033) and partially by the State Key
Laboratory of Theoretical and Computational Chemistry of Jilin University (Grant No. 9801). 相似文献
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A two-channel electrochemical quartz crystal microbalance (EQCM) was used to investigate the cyclic voltammetric behavior of two Prussian blue (PB) film-modified Au electrodes in a two-electrode con-figuration in aqueous solution. The redox peaks observed in the two-electrode cyclic voltammogram (CV) are assigned to the intrinsic redox transitions among the Everitt's salt, PB, and Prussian yellow for the film itself, the redox process of the Au substrate and the redox process of small-quantity ferri-/ferrocyanide impurities entrapped in the PB film, as also supported by ultraviolet-visible (UV-Vis) spectroelectrochemical data. The profile of the two-electrode solid-state CV for the PB powder sand-wiched between two gold-coated indium-tin oxide (ITO) electrodes is similar to that for two PB-modified Au electrodes in aqueous solution, implying similar origins for the corresponding redox peaks. The two-channel EQCM method is expected to become a highly effective technique for the studies of the two-electrode electrochemical behaviors of many other species/materials. 相似文献
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稀土络合催化合成橡胶 总被引:5,自引:0,他引:5
中国是稀土资源最丰富的国家,60年代起为充分利用我国的稀土资源,中国科学院长春应用化学研究所开展了稀土催化剂催化双烯烃聚合的研究,我国在世界上是最早开展这项研究的国家之一.自1964年,我们先后发表了稀土化合物在定向聚合中的催化活性的论文.从1971年开始我国率先进行稀土顺丁橡胶和异戊橡胶产业化开发工作.至今已发表了大量论文和多部专著.本文综述了关于稀土络合催化合成橡胶历年来的研究成果. 相似文献