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Electrolyte Effects on Charge Transport Behavior of [Os(bpy) 2 (PVP) 10 Cl]Cl and [Ru(bpy) 2 (PVP) 10 Cl]Cl Redox Polymers in Ultra‐Thin Films of Polyions
Author(s) -
Wang Bingquan,
Brown Stephanie,
Rusling James F.
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200503268
Subject(s) - quartz crystal microbalance , redox , electrochemistry , electrolyte , cyclic voltammetry , inorganic chemistry , materials science , pyrolytic carbon , chemical engineering , chemistry , electrode , organic chemistry , adsorption , pyrolysis , engineering
Metallopolymer films have important applications in electrochemical catalysis. The alternate electrostatic layer‐by‐layer method was used to assemble films of [Ru(bpy) 2 (PVP) 10 Cl]Cl (denoted as ClRu‐PVP) and [Os(bpy) 2 (PVP) 10 Cl]Cl (ClOs‐PVP) metallopolymers onto pyrolytic graphite electrodes. Film thickness estimated by quartz crystal microbalance was 6–8 nm. The effects of pH, electrolyte species and concentration on the electrochemical properties of these electroactive polymers were studied using cyclic voltammetry (CV). Behavior in various electrolytes was compared. Also the mass changes within the ultra‐thin film during redox of Os 2+/3+ were characterized by in situ electrochemical quartz crystal microbalance (EQCM). The results indicate rapid reversible electron transfer, and show that both ClRu‐PVP and ClOs‐PVP have compact surface structures while ClOs‐PVP is a little denser than ClRu‐PVP. Although hydrogen ions do not participate in the chemical reaction of either film, the movement of Na + cation and water accompanies the redox process of ClOs‐PVP films.