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Microscope in situ ftirs studies of CO adsorption on an array of platinum micro-electrodes

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Chinese Science Bulletin 2001年第19期46卷 1612-1615页

作者： Hui Gong Shenpei Chen Zhiyou Zhou Shigang Sun Xiamen Univ Dept Chem Inst Phys Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China

An array of platinum microelectrodes was designed and fabricated. The adsorption of CO on such a Pt microelectrode (μ-Pt) was investigated by employing microscope in situ FTIR spectroscopy. A nanostructured film is formed at the surface of μ-Pt (denoted as μ-Pt(R)) when it has been subjected to a treatment of fast potential cycling. Abnormal infrared effects (AIREs) were observed in CO adsorption on the surface of μ-Pt(R), consisting of the inversion of the IR bipolar CO band and the extensively enhanced IR adsorption of COad species.

关键词： array of platinum microelectrodes microscope in situ ftirs CO abnormal infrared effect.

In situ time-resolved ftirs study of adsorption and oxidation of ethylene glycol on Pt(100) electrode

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Chinese Science Bulletin 2005年第18期50卷 1995-1998页

作者： FAN Youjun ZHOU Zhiyou FAN Chunjie ZHEN Chunhua CHEN Shengpei SUN Shigang State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry Xiamen University Xiamen 361005 China

Adsorption and oxidation of ethylene glyco(EG) on Pt(100) electrode were studied by in situ timeresolved ftirs (TRftirs). The TRFTIR spectra recordedat 0.10 V illustrate that an IR band appears near 2050 cm?at t > 5 s, corresponding to linearly bonded CO formed indissociative adsorption of EG. The TRFTIR results haveconfirmed also that CO species are distributed uniformly onPt(100) surface. Another band appears near 2342 cm?1 at > 70 s, associating with IR absorption of CO2 produced inthe direct oxidation of EG. With the increase of electrodepotential, the direct oxidation of EG becomes gradually themain reaction. When the potential is above 0.40 V, the oxidation of EG occurs mainly via the reactive intermediates, *** containing –COOH determined by in situ TRftirs.

关键词：乙烯乙二醇 ftirs 吸附理论电极分离氧化

Pt(100)电极上乙二醇吸附和氧化的原位时间分辨ftirs研究

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科学通报 2005年第11期50卷 1073-1076页

作者：樊友军周志有范纯洁甄春花陈声培孙世刚固体表面物理化学国家重点实验室厦门大学化学系厦门361005

运用原位时间分辨FTIR反射光谱在分子水平研究乙二醇(EG)在Pt(100)单晶电极上吸附和氧化的动力学过程.在0.10V的时间分辨光谱中,当t>5s于2050cm?1附近出现的红外谱峰归因于EG解离吸附产物线性吸附态CO(COL)的红外吸收.红外光谱特征及其... 详细信息

运用原位时间分辨FTIR反射光谱在分子水平研究乙二醇(EG)在Pt(100)单晶电极上吸附和氧化的动力学过程.在0.10V的时间分辨光谱中,当t>5s于2050cm?1附近出现的红外谱峰归因于EG解离吸附产物线性吸附态CO(COL)的红外吸收.红外光谱特征及其变化还证实,吸附态CO在Pt(100)表面呈均匀分布;当t>70s于2342cm?1附近出现CO2的不对称伸缩振动谱峰,指认为EG的直接氧化.研究发现随着电位升高,直接氧化逐渐成为主要反应途径,使解离吸附反应削弱.当电位高于0.40V以后,EG的氧化主要通过活性中间产物(–COOH)的途径进行.

关键词：乙二醇 ftirs 原位电极时间分辨光谱红外光谱特征直接氧化动力学过程分子水平反射光谱红外吸收解离吸附均匀分布伸缩振动电位升高反应途径吸附反应中间产物吸附态 EG 不对称 CO2 谱峰表面

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复合型微孔聚合物电解质膜的ftirs研究

复合型微孔聚合物电解质膜的FTIRS研究

Abnormal infrared effects of nanometer scale thin film material of PtPd alloy in CO adsorption

全国第13届分子光谱学术报告会

作者：陈作锋姜艳霞陈卫曾冬梅庄全超孙世刚厦门大学化学系固体表面物理化学国家重点实验室

用红外透射和红外发射光谱法研究聚合物锂离子电池中聚合物膜等材料,得到一些有价值的应用结果。

关键词：聚合物电解质 PVdF-HFP ftirs 透射光谱发射光谱

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Chinese Science Bulletin 2001年第17期46卷 1439-1442页

作者： Zhi Chen Shigang Sun Nan Ding Zhiyou Zhou Xiamen Univ Dept Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China

Nanometer scale thin film material of PtPd alloy supported on glassy carbon (nm-PtPd/GC) was prepared by the electrochemical codeposition method under cyclic voltammetric conditions. STM patterns demonstrated that the prepared thin films are composed of layered crystallites in elliptic form. Electrochemical in situ ftirs studies explored the abnormal infrared effects (AIREs) of nm-PtPd/GC for CO adsorption, which are (i) the remarkable enhancement of IR absorption, (ii) the inversion of COad band direction, and (iii) notable increase in the full width at half maximum (FWHM) of COad bands. The results demonstrated also that the enhancement factor of IR absorption varies with the thickness of PtPd alloy film and has reached a maximum value of 38.3 under the experimental conditions.

关键词： nm-PtPd/GC STM in situ ftirs AIREs.

Special IR properties of palla-dium nanoparticles and their aggregations in CO molecular probe infrared spectroscopy

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Chinese Science Bulletin 2004年第15期49卷 1581-1585页

作者： JIANGYanxia CHENWei LIAOHonggang JINLanying SUNShigang StateKeyLaboratoryofPhysicalChemistryofSolidSurfaces DepartmentofChemistryXiamenUniversityXiamen361005China

Dispersed Pd nanoparticles (Pdn) have been synthesized by reducing H2PdCl4 with ethanol, and stabilized using poly(vinylpyrrolidone) (PVP). The Pdn is applied to the glassy carbon substrate to form a thin film, and then the potential cyclic scanning at 50 mV·s?1 from ?0.25 to 1.25 V was carried out for about 30 min to form the aggregations of Pdn (Pdn ). FTIR spectroscopy of both transmission and re- ag flection modes was employed to study CO adsorption on Pdn and Pdn in both solid|liquid and solid|gas interfaces. It has ag been revealed that CO adsorption on Pdn film yields two IR bands near 1964 and 1906 cm?1, which are assigned to IR absorption of CO bonded on asymmetric and symmetric bridge sites, respectively. In contrast to the IR properties of CO adsorbed on Pdn, only species of CO bonded on asym- metric bridge sites was determined on Pdn , and the direc- ag tion of the IR band near 1963 cm?1 is completely inverted. The full width at half-maximum (FWHM) of the COB band as near 1964 cm?1 is measured to be 14 cm?1 on Pdn film, while it is 24 cm?1 on Pdn film. The results of the present study ag demonstrated that the inverting of the IR band direction is a general phenomenon that is closely related to the interaction between nanoparticles in aggregation of Pdn.

关键词：铅纳米粒子聚集一氧化碳吸附一氧化碳分子碳针红外光谱 ftirs

In situ FTIR spectroscopic studies of CO adsorption on electrodes of nanometer-thin layer of Pt-Ru and Pt-Pd surface alloys

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Chinese Science Bulletin 1999年第16期44卷 1470-1474页

作者： Guoqiang Lu Lirong Cai Shigang Sun Junxiang He Xiamen Univ Dept Chem Inst Phys Chem State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China Wenzhou Normal Coll Dept Chem Wenzhou 325003 Peoples R China

CO adsorption on nanometer-thin layer of surface alloys of Pt-Ru and Pt-Pd prepared by electrochemical codeposition has been studied using in situ FTIR spectroscopy. Abnormal infrared effects (AIREs) that consist of the enhancement of IR absorption by adsorbed CO on different surface sites and the inversion of IR band direction have been observed on the thin-layer prepared. The results also demonstrate the considerable significance of Pt-Ru and Pt-Pd surface alloys in electrocatalysis applications.

关键词： surface alloy nanometer-thin layer in situ ftirs CO adsorption.

PtRu/C电催化剂上甲醇吸附氧化过程的电化学原位红外光谱

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高等学校化学学报 2006年第11期27卷 2123-2127页

作者：王琪孙公权闫世友汪国雄辛勤陈青松李君涛姜艳霞孙世刚中国科学院大连化学物理研究所厦门大学化学系固体表面物理化学国家重点实验室厦门361005

采用调变的多元醇法制备了高分散的Pt/C,PtRu/C和Ru/C电催化剂.XRD计算结果表明,PtRu/C电催化剂的平均粒径和合金度分别为2.2 nm和71%.采用电化学方法和原位傅里叶变换红外反射光谱方法(in situftirs)研究了甲醇在3种电催化剂上的吸附... 详细信息

采用调变的多元醇法制备了高分散的Pt/C,PtRu/C和Ru/C电催化剂.XRD计算结果表明,PtRu/C电催化剂的平均粒径和合金度分别为2.2 nm和71%.采用电化学方法和原位傅里叶变换红外反射光谱方法(in situftirs)研究了甲醇在3种电催化剂上的吸附氧化过程,发现PtRu/C对甲醇的催化活性明显高于Pt/C,Ru的加入一方面影响了甲醇在Pt上的解离吸附性能,另一方面提供了Ru-OH物种,从而抑制了低电位下电催化剂中毒.红外光谱研究结果表明,线性吸附态CO(COL)是主要毒化物种,反应产物主要是CO2,还有少量的甲酸甲酯.根据实验结果讨论了甲醇在PtRu/C电催化剂上的氧化机理.

关键词：直接甲醇燃料电池 PtRu/C 甲醇氧化电化学 in situ ftirs

碱性介质中纳米薄膜Ru电极上CO吸附的异常红外效应

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光谱学与光谱分析 2000年第6期20卷 755-757页

作者：郑明森陈声培孙世刚厦门大学化学系固体表面物理化学国家重点实验室厦门361005

研制纳米级厚度的Ru薄膜电极 ,并运用电化学原位FTIR反射光谱研究碱性介质中CO的吸附。检测到CO以线型吸附态为主 ,但也存在少量桥式吸附态 ,分别在 196 0和 1780cm-1附近给出红外吸收谱峰。发现纳米Ru膜电极具有异常红外效应 ,即CO谱... 详细信息

研制纳米级厚度的Ru薄膜电极 ,并运用电化学原位FTIR反射光谱研究碱性介质中CO的吸附。检测到CO以线型吸附态为主 ,但也存在少量桥式吸附态 ,分别在 196 0和 1780cm-1附近给出红外吸收谱峰。发现纳米Ru膜电极具有异常红外效应 ,即CO谱峰方向倒反 ,强度增强和半峰宽增加。测得在碱性溶液中吸附态CO的红外吸收被增强了 33倍 ,其增强因子是酸性溶液中的两倍左右。

关键词： CO ftirs 吸附钌纳米薄膜电极