Thermal Diffusion in Metal‐Organic Chemical Vapor Deposition

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Abstract
The electrochemical behavior of graphite and Ni‐Cr electrodes in sodium tetrasulfide melt has been investigated using voltammetric, chronoamperometric, and chronopotentiometric techniques in the presence and absence of hydrogen sulfide. Two continuous phases, namely, and , are apparently formed at different potentials during the cathodic polarization. The blocking effect by these layers was much less significant on the Ni‐Cr electrode than on graphite. The presence of did not appear to influence the electrode reactions, but it significantly reduced the rate of formation of the continuous phases ( or ) during cathodic polarization. A small amount of hydrogen gas was formed, possibly by chemical reactions between polysulfides and hydrogen sulfide.

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