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- W2005290259 abstract "The oxidative underpotential deposition (UPD) of S from a sulfide solution has been demonstrated and investigated using a polycrystalline Au electrode in a thin-layer electrochemical cell. UPD S appears to form spontaneously when a clean Au electrode is exposed to the sulfide solution. Subsequent oxidation of the sulfide to bulk sulfur is quantitative at potentials above −0.6 V vs. Ag/AgCl/1 M NaCl. This adsorbed S is quantitatively converted to sulfate in acidic electrolytes at potentials above 0.7 V. Oxidation of adsorbed S in a base solution also appears to form sulfates at potentials above 0.3 V; however, the process was considerably slower than that in an acid. The use of oxidative S UPD in the deposition of CdS using the method of electrochemical atomic layer epitaxy (ECALE) is also reported. An ECALE cycle was developed using a 2.5 mM Na2S solution alternated with a 10 mM CdSO4 solution. Both S and Cd were deposited at −0.6 V. Studies of deposits resulting from up to five ECALE cycles produced coverages of 0.45 monolayers of Cd and S per cycle, where 0.5 monolayers would have been ideal. In addition, the dependence of the deposit coverage on the Cd deposition potential was examined; this displayed the classic “S” shape expected for a surface-area-limited process." @default.
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- W2005290259 title "Thin-layer electrochemical studies of the oxidative underpotential deposition of sulfur and its application to the electrochemical atomic layer epitaxy deposition of CdS" @default.
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- W2005290259 doi "https://doi.org/10.1016/0022-0728(94)87092-6" @default.
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