Vergleichende Untersuchungen an Pb₈Tl₅O₂₄-, α-PbO₂- und Tl₂O₃-Elektroden / Comparative Investigations of Pb₈Tl₅O₂₄, α-PbO₂ and Tl₂O₃ Electrodes

Abstract

<jats:p>The anodic deposition of Pb<jats:sub>8</jats:sub>Tl<jats:sub>5</jats:sub>O<jats:sub>24</jats:sub> is compared with that one of Tl<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and α-PbO<jats:sub>2</jats:sub>. Scanning electron microscopic pictures of the oxide surfaces show obvious differences. This should be the reason for different oxygen overpotentials measured at these anodes. Comparative cyclic voltammograms show, that the redox behaviour of Pb<jats:sub>8</jats:sub>Tl<jats:sub>5</jats:sub>O<jats:sub>24</jats:sub> in sulfuric acid is essentially determined by the lead ions. Because of the high corrosion rate Pb<jats:sub>8</jats:sub>Tl<jats:sub>5</jats:sub>O<jats:sub>24</jats:sub> is not suitable as anode material for electrolysis in sulfuric acid</jats:p>

Electrodeposited Ceramic Superlattices

“…We have chosen the TlaPbbOcTldPbeOf system because of our earlier experience with the electrochemical and photoelectrochemical deposition of highly oriented films of thallium(III) oxide (5)(6)(7)(8). Also, the room-temperature electrodeposition of PbO2 (9)(10)(11) and Pb8T15O24 (12,13) are well documented.…”

Stratospheric Hydroperoxyl Measurements

“…Between these cutoff levels, the column integral reaches its 10 and 90% values at about 37 and 67 km, respectively. Within these adopted limits, the preferred millimeter-wave curve (13) gives an HO2 column of 2.7 x 1013 cm-2, which is --1.25 times as large as the column integral from our theoretical curve. Both curves are similar in shape.…”

“…The factor 0.94 is our estimate of the relative UV-induced difference in HO2, near 33 km, between the two times and locales; it is based on the numerical change in HO2 as the solar zenith angle is changed from 540 to 460 in our adopted thcorctical model (13).…”

“…The corresponding model curves are timeaveraged theoretical profiles(13). The uppermost two data points are tied together by an a priori ratio taken from the theoretical profile.…”