Effect of increasing amount of steps on the potential of zero total charge of Pt(111) electrodes

被引:104
作者
Climent, V [1 ]
Gómez, R [1 ]
Feliu, JM [1 ]
机构
[1] Univ Alicante, Dept Quim Fis, E-03080 Alicante, Spain
关键词
potential of zero total charge (pztc); Pt(111) electrodes; Stepped surfaces;
D O I
10.1016/S0013-4686(99)00241-8
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
This paper reports results on the interaction of CO with Pt(s)[n(111) x (111)] electrodes in perchloric acid medium. Charge displacement experiments allow the estimation of the potential of zero total charge (pztc) values for this series of stepped surfaces. The pztc values decrease linearly with the step density for n greater than or equal to 5, while for shorter terraces a plateau is observed. Knowledge of the pztc is a key point in the evaluation of the CO coverage by means of coulometric measurements. Using this method. we have calculated the CO surface concentration at saturation for a series of stepped surfaces. The resulting values are similar regardless of the step density, but they are significantly lower than those for the Pt(111) basal plane. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:629 / 637
页数:9
相关论文
共 31 条
[1]   ANION-SURFACE INTERACTIONS .3. N2O REDUCTION AS A CHEMICAL PROBE OF THE LOCAL POTENTIAL OF ZERO TOTAL CHARGE [J].
ATTARD, GA ;
AHMADI, A .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1995, 389 (1-2) :175-190
[2]   DIPOLE-MOMENTS ASSOCIATED WITH EDGE ATOMS - COMPARATIVE-STUDY ON STEPPED PT, AU AND W SURFACES [J].
BESOCKE, K ;
KRAHLURBAN, B ;
WAGNER, H .
SURFACE SCIENCE, 1977, 68 (01) :39-46
[3]   INTERACTION OF HYDROGEN WITH PT(111) - ROLE OF ATOMIC STEPS [J].
CHRISTMANN, K ;
ERTL, G .
SURFACE SCIENCE, 1976, 60 (02) :365-384
[4]   ADSORPTION OF HYDROGEN ON A PT(111) SURFACE [J].
CHRISTMANN, K ;
ERTL, G ;
PIGNET, T .
SURFACE SCIENCE, 1976, 54 (02) :365-392
[5]   COMPARISON OF IMMERSION AND OPEN-CIRCUIT SCRAPE METHODS FOR DETERMINING POTENTIAL OF ZERO CHARGE OF METAL ELECTRODES [J].
CLARK, GJ ;
ANDERSEN, TN ;
VALENTIN.RS ;
EYRING, H .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1974, 121 (05) :618-622
[6]   INSITU CHARACTERIZATION OF THE PT(S)-[N(111)X(111)] ELECTRODE SURFACES USING ELECTROSORBED HYDROGEN FOR PROBING TERRACE AND STEP SITES [J].
CLAVILIER, J ;
ELACHI, K ;
RODES, A .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1989, 272 (1-2) :253-261
[7]   PREPARATION OF MONO-CRYSTALLINE PT MICROELECTRODES AND ELECTROCHEMICAL STUDY OF THE PLANE SURFACES CUT IN THE DIRECTION OF THE (111) AND (110) PLANES [J].
CLAVILIER, J ;
FAURE, R ;
GUINET, G ;
DURAND, R .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1980, 107 (01) :205-209
[8]   ELECTROCHEMICAL MONITORING OF THE THERMAL REORDERING OF PLATINUM SINGLE-CRYSTAL SURFACES AFTER METALLOGRAPHIC POLISHING FROM THE EARLY STAGE TO THE EQUILIBRIUM SURFACES [J].
CLAVILIER, J ;
ELACHI, K ;
PETIT, M ;
RODES, A ;
ZAMAKHCHARI, MA .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1990, 295 (1-2) :333-356
[9]   ELECTROCHEMICAL ADSORPTION BEHAVIOR OF PLATINUM STEPPED SURFACES IN SULFURIC-ACID-SOLUTIONS [J].
CLAVILIER, J ;
ARMAND, D ;
SUN, SG ;
PETIT, M .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1986, 205 (1-2) :267-277
[10]   DISPLACEMENT OF ADSORBED IODINE ON PLATINUM SINGLE-CRYSTAL ELECTRODES BY IRREVERSIBLE ADSORPTION OF CO AT CONTROLLED POTENTIAL [J].
CLAVILIER, J ;
ALBALAT, R ;
GOMEZ, R ;
ORTS, JM ;
FELIU, JM .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1993, 360 (1-2) :325-335