The potentials of zero charge of Pd(1 1 1) and thin Pd overlayers on Au(1 1 1)

• Published in: Electrochemistry communications Vol. 4; no. 7; pp. 535 - 539
• Main Authors: El-Aziz, A.M., Kibler, L.A., Kolb, D.M.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.07.2002; Amsterdam Elsevier Science; New York, NY
• Subjects: Chemistry; Dipole contribution; Double-layer capacity; Electrochemistry; Exact sciences and technology; General and physical chemistry; Pd overlayers; Potential of zero charge; Study of interfaces; Transport phenomena; Work function; Potential of zero charge; Work function; Pd overlayers; Pd; Dipole contribution; Double-layer capacity; Electrochemical potential; Monolayer; Electrochemical double layer; Electrode electrolyte interface; Transition metal; Crystal face; Palladium; Experimental study; Transport process; Electrochemical properties; Crystal electrode; Dilute solution; Zero charge potential; Aqueous solution; Platinoid; Electrode capacity
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/S1388-2481(02)00362-4

The potential of zero charge (pzc) of Pd(1 1 1) has been determined in dilute NaF solutions by measuring the Gouy–Chapman minimum of the double-layer capacity. For a massive Pd(1 1 1) single crystal electrode a pzc of −0.12 V vs. SCE has been found. The corresponding values for thin Pd(1 1 1) overlayers on Au(1 1 1) have also been determined. While the pzc of the first, pseudomorphic Pd layer on Au(1 1 1) is −0.09 V vs. SCE, the pzc of a five monolayers thick Pd film on Au(1 1 1) is practically identical to the pzc of the massive Pd(1 1 1) electrode. By comparing pzc's and work functions for Au(1 1 1) and Pd(1 1 1), the dipole contribution to the potential drop across the Pd(1 1 1)/water interface is estimated.