ENHANCING THE ELECTROCHEMICAL REVERSIBILITY OF QUINONES ON PLATINUM SURFACES IN ORDER TO IMPROVE THE CHARACTERISTICS OF PHOTOBIOELECTRODES WITH PHOTOSYNTHETIC REACTION SITES
Aa. Solovev et al., ENHANCING THE ELECTROCHEMICAL REVERSIBILITY OF QUINONES ON PLATINUM SURFACES IN ORDER TO IMPROVE THE CHARACTERISTICS OF PHOTOBIOELECTRODES WITH PHOTOSYNTHETIC REACTION SITES, Soviet electrochemistry, 28(12), 1992, pp. 1448-1456
Electrochemical aspects of exogenic quinones functioning as the electr
on transfer mediators required in the development of photobioelectrode
s with photosynthetic reaction sites were studied. New methods for the
modification of Pt and Pt amalgam electrodes with monolayers of napht
hoquinones were suggested. The immobilized quinone monolayers were fou
nd to be electrochemically reversible. It was shown, moreover, that an
enhanced electrochemical reversibility of ubiquinone solubilized in t
he aqueous medium can be attained when the Pt surface is modified by c
ysteamine or, particularly so, by amalgamation. Monolayer adsorption o
f the reaction sites on the electrode surface has almost no influence
on the electrochemical properties of the monolayer of immobilized naph
thoquinone, but appreciably restricts the electrochemical process invo
lving solubilized ubiquinone. The photoelectric activity of bacterial
reaction sites adsorbed on the different electrode substrates was inve
stigated, and found to strongly depend on the type of monolayer presen
t. The results obtained were discussed in relation to the electrochemi
cal properties of quinones.