THE TEMPERATURE-COEFFICIENT OF THE POTENTIAL OF ZERO CHARGE OF STEPPED FACES OF GOLD IN CONTACT WITH AQUEOUS PERCHLORIC-ACID SOLUTIONS

Potentials of zero charge, E(sigma=0), and the temperature coefficient s of E(sigma=0) for stepped surfaces of sold single crystals (511), (5 33), (331) and (311) were obtained from the minimum of the differentia l capacity curve in dilute HClO4 solutions. The results are compared w ith those obtained for the low index faces and dilute in terms of the effect of the surface density of steps and the step orientation. The p ossible relevance of the effect of steps on the interaction of water w ith gold surfaces is discussed.