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任斌, Xu-Feng Lin, †, Bin Ren, *, † and Zhong-Qun Tian‡
J. Phys. Chem. B 2004, 108, 981-986,-0001,():
-1年11月30日
By using the previously developed roughening method for producing SERS-active Rh electrode, and assistedby the highly sensitive confocal microprobe Raman system, we carried out a detailed SERS study on thedissociation and electrooxidation of C1 molecules on a Rh surface. The SERS spectra obtained in a widefrequency region provide not only the vibrations reflecting the internal bonding of CO (at ca. 2000cm-1) butalso the bonding between CO or O with Rh (at ca. 450cm-1). A complementary electrochemical study wasalso performed on the roughened Rh surface in order to correlate the electrochemical and vibrationalinformation. Both electrochemical and SERS studies show that Rh has no discernible activity toward theelectrooxidation or dissociation of methanol in acidic solutions. Rh becomes active and its activity increaseswith the decrease of the solution acidity. For HCHO and HCOOH, the electrooxidation activity of Rh increaseswith increasing pH. On the basis of the result of the model CO system, discussion on the dissociation orelectrooxidation mechanisms was presented for C1 molecules on Rh.
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任斌, Guo-Kun Liu, †, ‡, Bin Ren, *, §, De-Yin Wu, Sai Duan, Jian-Feng Li, Jian-Lin Yao, Ren-Ao Gu, ‡ and Zhong-Qun Tian†
J. Phys. Chem. B 2006, 110, 17498-17506,-0001,():
-1年11月30日
Investigation of benzene adsorption on different metal surfaces closer to a practical system appears to be avery important intermediate stage to utilize the conclusion obtained on single-crystal surfaces. In this paper, we studied the electrochemical adsorption behaviors of benzene on roughened Pt group electrodes usingsurface enhanced Raman spectroscopy (SERS). The effects of potential, surface roughness, and benzeneconcentration were investigated. Significant difference in surface Raman spectra of benzene on Ru, Rh, Pd,and Pt surfaces were found. On Pt surfaces, the parallel-chemisorbed benzene, the vertical dissociated chemisorbedbenzene, and the physisorbed benzene were observed, evidenced by the ring vibration mode appearingat 872, 1012, and 991cm-1, respectively. On Pd, only parallel-chemisorbed benzene and physisorbed benzenewere found. On Rh and Ru, the SERS signals were mainly from the parallel-chemisorbed benzene, with anextremely weak signal from the physisorbed benzene. The potential dependent study reveals that the parallelchemisorbedspecies interacts strongest with the substrate, while the physisorbed species can be easily removedat positive potentials. The models for the adsorbed benzene were given to account for the different types ofbenzene on these Pt group metals. The difference in the atomization heat of the four metals was used tointerpret the different interaction strength of benzene with Pt group metals.
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任斌, Zhong-Qun Tian and Bin Ren
Annu. Rev. Phys. Chem. 2004. 55: 197-229,-0001,():
-1年11月30日
Over the past three decades, surface-enhanced Raman spectroscopy (SERS) has gone through a tortuous pathway to develop into a powerful surface diagnostic technique for in situ investigation of surface adsorption and reactions on electrodes. This review presents the recent progress achieved mainly in our laboratory on the improvement of detection sensitivities as well as spectral, temporal, and spatial resolutions. Various surface roughening procedures for electrodes of different metals coupled with maximum use of a high-sensitivity confocal Raman microscope enable us to obtain good-quality SER spectra on the electrode surfaces made from net Pt, Ni, Co, Fe, Pd, Rh, Ru, and their alloys that were traditionally considered to be non-SERS active. A novel technique called potential-averaged SERS (PASERS) has been developed for the quantitative study of electrochemical sorption. Applications are exemplified on extensively studied areas such as coadsorption, electrocatalysis, corrosion, and fuel cells, and several advantages of in situ electrochemical SERS are demonstrated. Finally, further developments in this field are briefly discussed with emphasis on the emerging methodology.
confocal Raman microscopy,, time-resolved measurement,, hydrogen adsorption,, methanol oxidation,, interfacial water
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【期刊论文】 A Simple and Effective Route for the Synthesis of Crystalline Silver Nanorods and Nanowires
任斌
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-1年11月30日
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