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Adsorption and corrosion inhibition behavior of imidazole on cobalt electrodes studied by SERS and electrochemical methods

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Science china chemistry 2005年第6期48卷 497-503页

作者： GU Wei1, LIU Guokun2. REN Bin2. WU Deyin2. GU Renao1 & TIAN Zhongqun2.1. department of chemistry,{2., Suzhou university, Suzhou 2.5006, china 2. state key laboratory for physical chemistry of solid surfaces and department of chemistry,{2., xiamen university, xiamen 361005, china department of chemistry College of Chemistry and Chemical Engineering Suzhou University Suzhou China state key {2. for physical chemistry of solid surfaces and department of chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen China

The interaction of imidazole with Co electrodes in an electrochemical system was studied by surface-enhanced Raman scattering (SERS) and electrochemical methods. The SER spectra of Co in an imidazole solution as a function of the applied potential were analyzed and the assignment of the Raman bands was made. It was found that there were three kinds of sur-face species on the Co surface in different potential regions and they were interchangeable de-pending on the potential. In a relatively negative potential region (?1.2.to ?0.9 V), imidazole was adsorbed on the surface and its orientation might change from a vertical configuration via the N-end of the pyridine ring to a tilted configuration via the C2.N3 double bond. In a more positive potential region (?0.8 to ?0.7 V), the SERS signal from the adsorbed imidazole weakened and finally disappeared, meanwhile the signal from the Co and imidazole complex strengthened gradually. At the open circuit potential (?0.6 V), we detected very strong bands from the Co ox-ides. By comparing the Tafel curves of the Co electrode in the solution without and with imidazole, we found that imidazole has a marked effect on the corrosion inhibition of the Co electrode. This result demonstrates that we may be able to reveal the complicated interaction of surface species with metal surface at the molecular level by combining the SERS and electrochemical methods.

关键词： cobalt, imidazole, inhibition, surface-enhanced Raman spectroscopy, Tafel plot.

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A simple solvothermal route towards the morphological control of ZnO and tuning of its optical and photocatalytic properties

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Science china chemistry 2010年第8期53卷 1711-1717页

作者： JIANG YaQi,LI FangFang,SUN Ran,XIE ZhaoXiong & ZHENG LanSun state key {2. for physical chemistry of solid surfaces department of chemistry,college of chemistry and chemical {12.,xiamen university,xiamen 361005,china state key {2. for physical chemistry of solid surfaces department of chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen China

ZnO nanoparticles with different morphologies were solvothermally synthesized by controlling the alkali (sodium hydroxide) concentration in an isopropanol *** products were characterized by means of powder X-ray diffraction,UV-visible absorption spectra,scanning electron microscopy,transmission electron microscopy,and selected area electron *** morphologies of the formed ZnO nanocrystals were dependent on the concentration of the alkali,and with increases of sodium hydroxide concentration,the ZnO nanocrystals evolved from rod to hexagonal bipyramid,and then to a flower-like *** flower-like nanostructure resulted from the etching of the hexagonal bipyramid by the excess *** photoluminescence and photocatalytic properties of the prepared ZnO were *** difference of green emission among the ZnO nanocrystals indicated that a higher sodium hydroxide concentration led to a higher level of *** size,the surface structure and defects in the ZnO nanocrystals affected its photo-degradation characteristics.

关键词： zinc oxide solvothermal method nanocrystal photoluminescence photocatalysis

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Controllable incorporation of CdS nanoparticles into TiO_2.nanotubes for highly enhancing the photocatalytic response to visible light

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Science china chemistry 2009年第12期52卷 2148-2155页

作者： WANG ChengLin1,SUN Lan1,XIE KunPeng1 & LIN ChangJian1,2.1 department of chemistry,{2. of chemistry and chemical engineering,xiamen university,xiamen 361005,china 2.state {12. laboratory of physical chemistry of solid surfaces,xiamen university,xiamen 361005,china department of chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen China state key {2. of physical chemistry of solid surfaces Xiamen University Xiamen China

A constant current electrochemical deposition was employed to incorporate CdS nanoparticles into the TiO2.nanotube arrays (TiO2.Ts). The size and amount of CdS nanoparticles in TiO2.Ts (CdS@TiO2.Ts) were controllable via modulating current,deposition time and electrolyte concentration. It was revealed,from the scanning electron microscopy (SEM) images and X-ray photoelectron spectroscopy (XPS) in depth profile,that CdS nanoparticles were filled into TiO2.nanotubes. A shift of the absorption edge toward the visible region under the optimal electrodeposition condition was observed with the diffuse reflectance spectroscopy (DRS). A 5-fold enhancement in the photocurrent spectrum for TiO2.Ts was observed and the photocurrent response range was significantly extended into the visible region because of the CdS incorporation. Compared with pure TiO2.Ts,under a visible light irradiation,CdS@TiO2.Ts exhibited a 3.5-fold improvement of photocatalytic activity,which was demonstrated by the photocatalytic decomposition of Rhodamine B (RhB).

关键词： TiO2 nanotube CdS photocatalysis RhB

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CHOLESTERIC LIQUID CRYSTALLINE CHARACTER ON THE SURFACE OF CHITOSAN/POLYACRYLIC ACID COMPOSITES

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Chinese Journal of Polymer Science 2001年第3期19卷 247-253页

作者： Yan-ming Dong Yu-song Wu Mian Wang department of Materials Science & state {2. laboratory for physical chemistry of solid surfaces, xiamen university xiamen 361005, china 厦门大学固体表面物理化学国家重点实验室福建厦门

The cholesteric liquid crystalline structure in chitosan/polyacrylic acid composite films was studied by surface techniques. A periodical lamellar-like structure was observed in the permanganic acid etched film surface by both scanning electron microscopy (SEM) and atomic force microscopy (AFM), instead of the thumb-print texture which can be detected with polarized optical microscopy. It is suggested that the periodical lamellar-like structure is induced by the etching selectivity between cholesteric layers due to different molecular arrangement on the film surface. Four kinds of perpendicular disclinations, i.e. chi --> tau (-) + lambda (+), chi --> lambda (-) + tau (+), chi --> tau (-) + tau (+) and chi --> lambda (-) + lambda (+) were found in the composite films from SEM observations. The smallest periodicity of lamellar-like structure (equals to half pitch) is 2. similar to 40 nm measured with AFM.

关键词： chitosan cholesteric order liquid crystalline fingerprint texture lamellar structure SEM AFM

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An Ab Initio Study of N_2. Decomposition on MgO Catalyst

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Chinese chemical Letters 1998年第6期9卷 583-586页

作者： Xin LU Xin XU Nan Qin WANG and Qian Er ZHANG(state key {2. for physical chemistry of solid surfaces, Institute of physical chemistry,department of chemistry, xiamen university,{12.) state key Lab. Phys. Chem. {2. S. Institute of Physical Chemistry Xiamen University Xiamen 361005 China

Ab initio calculations based on density functional theory have been used to study thedecompsition of N_2. on MgO. The reaction is predicted to occur on O_3c and O_(4c) atoms, but not onO_(5c) atoms, with an activation barrier of 2.-2. kcal/mol, in agreement with the experimental valueof 35 kcal/mol. Natural bond orbital analysis shows that the reaction leaves O ad-atoms on thosesurface O anions to form a peroxide-like 'O^2.(2.)' species. The )O-O bond stretching frequency ispredicted to be in the range from 82. cm(-1) to 82. cm(-1).

关键词： Ab initio calculation N_2. decomposition MgO catalyst

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Foreword

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电化学 2012年第5期18卷 385-386页

作者： Dr.Bin Ren Professor of chemistry state {2. laboratory of physical chemistry of solid surfaces,college of chemistry and chemical engineering,{12. university,{12. 361005,china

On the request of ***-Gang Sun,Editor-in-Chief of Journal of Electrochemistry,I served asthe guest editor for this International Special Issueon Current *** Journal of Electrochemistry was founded in1995 associated

关键词：电化学电化学平衡电解质电解

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Synthesis and characterization of stable osmafuran starting from HC≡CCH(OH)C≡CH and OsHCl(CO)(PPh_3)_3

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Science china chemistry 2010年第9期53卷 1978-1981页

作者： ZHANG Hong,LIN Ran,LUO Ming & XIA HaiPing state key {2. for physical chemistry of solid surfaces college of chemistry and chemical engineering,xiamen {12.,xiamen 361005,china state key {2. for physical chemistry of solid surfaces college of chemistry and {2. engineering Xiamen University Xiamen China

This paper presents a new convenient route to prepare osmafuran starting from readily accessible HC≡C CH(OH)C≡CH and OsHCl(CO)(PPh3)*** of a solution of OsHCl(CO)(PPh3)3 in dichloromethane with HC≡C CH(OH)C≡CH,followed by the addition of acetic acid,produced osmafuran [Os(CHC(PPh3)CO(CH2.H3))Cl(CO)(PPh3)2.Cl(2..2.has been isolated in good yield and fully characterized.1H and 13C NMR spectra show the characteristic downfield chemical shifts of the ring hydrogen and carbon *** and X-ray diffraction data provide strong evidence for the aromatic nature of *** due to the effect of the phosphonium substituent,2.exhibits remarkable thermal stability,air stability and lower reactivity.

关键词： osmafuran metallaaromatics phosphonium salt synthesis stability

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Size and support effects for CO oxidation on supported Pd catalysts

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Science china chemistry 2010年第9期53卷 2047-2056页

作者： WANG ZhaoWen,LI Bin,CHEN MingShu,WENG WeiZheng & WAN HuiLin state key laboratory of physical chemistry of solid surfaces National engineering laboratory for Green chemical Productions of Alcohols-Ethers-Esters department of chemistry,college of chemistry and chemical engineering,xiamen university,xiamen 361005,china state key {2. of physical chemistry of solid surfaces Xiamen University Xiamen China National engineering laboratory for Green {2. Productions of Alcohols-Ethers-Esters Xiamen University Xiamen China department of chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen China

Supporting Pd catalysts characterized significant different size distribution were obtained using PdCl2.[Pd(NH3)4](NO3)2.and Pd(acac)2.as ***-resolution transmission electron microscopy(TEM),X-ray diffraction(XRD),in-situ Fourier transform infrared spectroscopy(FTIR) and Raman spectroscopy were used to examine the dispersion of *** performance measurements show that the activities for CO oxidation increase as the Pd particle size decreases and the O2.CO ratio *** activities under oxygen rich conditions are significantly higher than those at near the stoichiometric *** on TiO2.prepared by the Pd(acac)2.precursor is highly dispersed,leading to a considerable activity for CO oxidation at near room *** oxidation on the 1 wt% Pd/TiO2.and under an O2.CO ratio of 1 characterized an apparent activation energy of 36.7 kJ/mol,which is closed to those reported for CO oxidation on the supported Au *** present work demonstrates a high catalytic activity of highly dispersed noble metals,and suggests a promising approach of using noble metals as catalysts with exceeding high efficiency.

关键词： noble metals supported palladium CO oxidation size effect support effect

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The　Active　Oxygen　Species　for　Oxidative　Coupling　of　Methane　over　CeO_2.BaF_2.Catalyst　by　in　Situ　Confocal　Microprobe　Raman　Spectroscopy

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chemical Research in Chinese Universities 1997年第1期13卷 93-95页

作者： LONG Rui qiang and WAN Hui lin (department of chemistry and {2. key laboratory for physical chemistry of the solid Surface, xiamen university, xiamen, 361005) xiamen UNIV DEPT CHEMXIAMEN 361005PEOPLES R CHINA xiamen UNIV STATE KEY LAB PHYS CHEM SOLID SURFACEXIAMEN 361005PEOPLES R CHINA

ＴｈｅＡｃｔｉｖｅＯｘｙｇｅｎＳｐｅｃｉｅｓｆｏｒＯｘｉｄａｔｉｖｅＣｏｕｐｌｉｎｇｏｆＭｅｔｈａｎｅｏｖｅｒＣｅＯ２／ＢａＦ２ＣａｔａｌｙｓｔｂｙｉｎＳｉｔｕＣｏｎｆｏｃａｌＭｉｃｒｏｐｒｏｂｅＲａｍａｎＳｐｅｃｔ... 详细信息

ＴｈｅＡｃｔｉｖｅＯｘｙｇｅｎＳｐｅｃｉｅｓｆｏｒＯｘｉｄａｔｉｖｅＣｏｕｐｌｉｎｇｏｆＭｅｔｈａｎｅｏｖｅｒＣｅＯ２／ＢａＦ２ＣａｔａｌｙｓｔｂｙｉｎＳｉｔｕＣｏｎｆｏｃａｌＭｉｃｒｏｐｒｏｂｅＲａｍａｎＳｐｅｃｔｒｏｓｃｏｐｙ＊＊Ｓｕｐｐｏｒｔｅ...

关键词： Oxygen species Oxidative coupling Methane In situ Raman spectroscopy

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XRD & XPS Study on the BaF_2.Promoted Sm_2._3-LaF_3 Catalysts

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Chinese chemical Letters 1997年第1期8卷 83-86页

作者： Ji Zhong LUO and Hui Lin WAN(department of chemistry & {2. key laboratory for physical chemistry of the solid Surface, xiamen universityxiamen 361005) department of chemistry State Key Lab. Phys. Chem. Solid S. Xiamen University Xiamen 361005 China

Sm2.3-LaF3 and BaF2.promoted Sm2.3W3 catalysts shown good catalytic performance for the Oxidative Dehydrogenation of Ethane(ODE). XRD and XPS characterizations of the catalysts show the structure defects, which may be produced by the partial exchange of anions and cations,enhance the electron donating ability and increase the surface absorbed oxygen concentration thus should be favorable to improve the catalytic activity. However, the higher concentration of surface adsorbed oxygen is unfavorable for the ethene selectivity.

关键词： Sm La XRD XPS Study on the BaF2.Promoted Sm2.3-LaF3 Catalysts

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