TOWARDS MOLECULAR-LEVEL UNDERSTANDING OF ELECTROCATALYTIC HYDROGENATION. PART 2. BEHAVIOR OF BENZENE AT PT(hkl)

摘要

In order to gain a molecular-level comprehension of electrocatalytic hydrogenation, we analyze the modifications of cyclic-voltammetry (CV) profiles caused by benzene adsorption on Pt(111), Pt(110) and Pt(100) electrodes and examine the evolution of benzene, hydrogen and anion surface coverage upon potential scanning between 0.05 and 0.80 V (0.075 V for Pt(100)) in 0.05 and 0.50 M aq. H_2SO_4 + 1 mM benzene electrolytes. The change of benzene coverage is discussed in terms of the surface geometry, H_(UPD) and anion adsorption. We also examine the effect of benzene concentration in 0.05 M aq. H_2SO_4 + x mM benzene, x = 1, 5, 10, 20, on the CV response.