Adsorption of CO accompanied with simultaneous charge transfer on copper single crystal electrodes related with electrochemical reduction of CO2 to hydrocarbons
1995; Elsevier BV; Volume: 335; Linguagem: Inglês
10.1016/0039-6028(95)00441-6
ISSN1879-2758
AutoresYoshio Hori, Hidetoshi Wakebe, T. Tsukamoto, Osamu Koga,
Tópico(s)Electrochemical Analysis and Applications
ResumoCO2 and CO were electrochemically reduced with Cu(100), Cu(110) and Cu(111) electrodes at a constant current density of 5 mA cm−2 in 0.1M KHCO3 at ambient temperature. C2H4 is favorably produced on Cu(100), and CH4 is predominantly yielded on Cu(111). Cu(110) showed an intermediate product selectivity. Voltammetric measurements in the presence of CO in phosphate buffer solutions gave a pair of sharp charge transfer redox peaks with Cu(100) and Cu(110), not with Cu(111). The charge transfer peaks depend greatly on the anionic species of the electrolyte, and are rationalized by charge displacement due to desorption of specifically adsorbed anions during CO adsorption. Competitive adsorption of anions and CO on Cu single crystal electrode surfaces is discussed on the basis of electrochemical and in situ FTIR spectroscopic measurements.
Referência(s)