Charge displacement adsorption of carbon monoxide on [110] zone copper single crystal electrodes in relation with PZC

CO is adsorbed on Cu electrode with a simultaneous transfer of charge. The apparent charge transfer is derived from displacement of anions specificall y adsorbed on the electrode during the adsorption of CO. This paper present s the results of voltammetric measurements of the adsorption of CO on singl e crystal electrodes of Cu[110] zone in phosphate buffer solution (pH 6.8)a t 0 degrees C. The profile of the charge transfer wave depends significantl y on the crystal orientation of Cu single crystals. The potential of the ch arge transfer is well correlated with the work functions and the potential of zero charge of the Cu single crystals. We propose a model that H2PO4 is specifically adsorbed on (100) steps of Cu[110] zone crystal electrodes occ upying 3 to 4 atomic sites. (C) 1998 Elsevier Science Ltd. All rights reser ved.