ADSORPTION OF UREA ON THE PT(100) ELECTRODE - EXPERIMENTS AND LATTICE-GAS MODELING

被引：31

作者：

GAMBOAALDECO, M

MROZEK, P

RHEE, CK

WIECKOWSKI, A

RIKVOLD, PA

WANG, Q

机构：

[1] UNIV ILLINOIS,DEPT CHEM,URBANA,IL 61801

[2] FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,DEPT PHYS,TALLAHASSEE,FL 32306

[3] FLORIDA STATE UNIV,CTR MAT RES & TECHNOL,TALLAHASSEE,FL 32306

来源：

SURFACE SCIENCE | 1993年 / 297卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0039-6028(93)90212-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report a complete experimental and theoretical description of urea adsorption on the Pt(100) electrode. We have used voltammetry, radiochemistry, LEED and quantitative Auger electron spectroscopy, as well as Monte Carlo simulations of a lattice-gas model developed for this study. We demonstrate that the simulation results agree well with those of our experiments. These include an ordered c(2 x 4) adsorbed urea phase and sharply peaked voltammograms. We interpret our observations as associated with a phase transition between the urea phase for potentials on the positive side of the voltammetric peak and a (1 x 1) monolayer of hydrogen phase on the negative side. The main products of this research are the lattice-gas model that describes the microscopic adsorption geometry and the effective lateral interaction energies of the urea surface species involved in the phase transition behavior.

引用

页码：L135 / L140

页数：6