Surface electrochemistry

Molecular Orientation of Hydroquinone Adsorbed at a Platinum(111) Thin-Layer Electrode

“…Furthermore, this accounts for the observation that the HREELS spectrum of HQ on the disordered Pt surface was less sharply delineated than that from an ordered Pt(111) surface (6). In addition, the fact that there is a larger fraction of molecules adsorbed in the vertical form on the disordered surface than on the ordered surface is consistent with the expectation that the vertical adsorption process should be more prevalent on disordered Pt surfaces, since it requires breakage of two strong C-H bonds (23). The fact that this fraction noticeably increases with the increase of electrode potential for the adsorption on the disordered surface is a further indication that the vertical adsorption process is electrochemically catalyzed.…”

Highly sensitive and reusable Pt-black microfluidic electrodes for long-term electrochemical sensing

“…This often originates from adsorption of ions, organic molecules, proteins, or polymers onto the electrode surface, which can passivate or deactivate catalytic sites responsible for redox activity (Hubbard, 1990; Vaddiraju et al, 2010). Aromatic amines, such as o-phenylenediamine (o-PD), have been shown to bind strongly on various metal electrode surfaces (Hubbard, 1990), and if exposed to high enough oxidative potential (above 0.4 V vs . Ag/AgCl), they electrodeposit as conjugated oligomers or polymers (Garjonyte and Malinauskas, 1999).…”

Modern Electrochemistry 2A

“…Naphthyl compounds adsorb more than phenyl compounds, and these latter more than butyl compounds in polycrystalline platinum electrodes. For example, adsorption of nicotinic acid on Pt(l11) at negative potentials leads to attachment exclusively through its nitrogen, while at the most positive potential, both the aromatic nitrogen and carboxylate moiety are bonded to the surface (Hubbard, 1990). For example, adsorption of nicotinic acid on Pt(l11) at negative potentials leads to attachment exclusively through its nitrogen, while at the most positive potential, both the aromatic nitrogen and carboxylate moiety are bonded to the surface (Hubbard, 1990).…”