A combined piezoelectric and EQCM study of underpotential deposition of silver on gold electrodes

✍ Scribed by Masahiro Seo; Masaki Aomi; Kengo Yoshida

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 588 KB
• Volume: 39
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(94)e0018-u

✦ Synopsis

The p~exoelectnc dete&on of change m surface energy combmed anth the use of electrochenucal quartz crystal nucrobalance (EQCM) was applted to underpotentnd deposition (I@) of salver on gold electrode The upd of alver on gold was performed anth a potenhodynanuc method (IOmVs-') m a deaerated solution of 0 1 moldm-" Na,SO, + 10m3 moldm-3 H,SO, + 5 x lo-" moldm-" Ag2S0, The ampbtude, 1 A I, and phase angle, 4, of the plexoelectrtc signals changed depenchng on the adsorbed amount of salver m the potentml range of 110-O 56V (she) Parttcularly. two charmstic potentials at which 1 A 1 took a mmnnum value and 4 changed by about 140", appeared m both am&c and cathodic potential sweep The charactenst~c potentis, E, = 062V, and E, = 0.9OV (she) correspond to the potenhals of electrocapdlary muumum and maumum, respecWely The presence of two charactenstic potentmls durmg the upd was explamed by takmg mto account the changes m adsorptmn state of HSO; or SOi-Ions The EQCM results m&c&d that the complete charge transfer of salver ions, z = 1 takes place durmg the upd The p~ezoelectnc demon of change m surface energy responded sensltlvely to the structural changes m the upd adsorbate as compared ~tb the EQCM