Rh多晶表面 CO还原过程的电化学和原位FTIR反射光谱研究

Translated title of the contribution: Electrochemical and in situ FTIR Spectroscopic Studies of CO2 Reduction on Polycrystalline Rh Surface

洪双进, 周志有, 孙世刚*, 邵国强, 区泽堂

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

1 Citation (Scopus)



The reduction of carbon dioxide on polycrystalline Rh electrode is studied by using programmed potential sweep method and in situ FTIR spectroscopy. Emphases are laid on the study of surface processes involved in the reduction. The adsorbed species derived from CO2reduction (r-CO2) have been determined by in situ FTIR as bridge(COB) and linear(COL) bonded CO, which yield IRabsorption bands respectively around 1905 and 2020cm-1. The onset potential of CO2reduction has been determined at -0.05 V. The programmed potential sweep experiments demonstrated that the oxidation of r-CO2occurred in a current peak at about 0.36 V, from which the charge of r-CO2oxidation(Qox) has been measured quantitatively. It has been revealed that the Qoxvaries with the potential(Er) and the time(tr) applied for CO2reduction. At a given tr, Qoxincreases along with the decrease of Erfrom -0.15 V to -0.40 V. At each Er, Qoxreaches its saturation value (Qoxs) when tris longer than 250s. In comparison with the oxidation charge(498μCcm-2) for a saturation adsorption of CO on Rh electrode, the small value of Qsox(e.g., 270 Ccm-2even for Erat -0.40 V) indicates that the quantity of adsorbed CO species produced in CO2reduction is far from that of a monolayer coverage. The ratio of the intensity of IRband of bridge bonded COto that of linear bonded CO is served to figure out the surface site occupancy by r-CO2.In considering that the number of surface site occupied by bridge and linear bonded CO is 2 and 1 respectively, the surface site occupancy by r-CO2has been evaluated at only 73% for CO2reduction at -0.25V for 600 s. It has been demonstrated that the subsequent adsorption of COon the 27% vacancy surface sites yields mainly linear bonded COspecies, implying that the reduction of a CO2molecule may need the assistance of a few adjacent surface sites. The in situ FTIRresults also confirmed that the submonolayer of r-CO2is in a uniform distribution over Rh electrode surface. Finally, a reduction mechanism of CO2on Rh electrode has been proposed based on results of both programmed potential sweep method and in situ FTIR spectroscopy, in which the hydrogen adsorption is considered as an important step assisting the reduction.

Translated title of the contributionElectrochemical and in situ FTIR Spectroscopic Studies of CO2 Reduction on Polycrystalline Rh Surface
Original languageChinese (Simplified)
Pages (from-to)923-927
Number of pages5
Issue number6
Publication statusPublished - 24 Jun 1999

Scopus Subject Areas

  • Chemistry(all)

User-Defined Keywords

  • Rh电极
  • CO2
  • 电催化还原
  • 原位FTIR反射光谱
  • 程序电位扫描法
  • Rh electrode
  • Electrocatalytic reduction
  • in situ FTIR spectroscopy
  • Programmed potential sweep method


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