A combined voltammetry and electrochemical quartz crystal microgravimetry study of the reduction of aqueous Se(IV) at gold

摘要: Abstract The reduction of Se(IV) in 0.5 M Na 2 SO 4 is complex and does not proceed via the → Se(0) Se(II-) scheme considered by most previous authors. A combined use voltammetry electrochemical quartz crystal microgravimetry techniques shows that direct 6e − pathway competes with initial four-electron process. Coupling a subsequent (fast) chemical reaction between results further deposition at electrode surface. behavior more negative potentials reflects interplay six-electron processes along effect ions stripped from selenium layer. Thus delicate balance these influenced two variables, namely potential concentration electrolyte. Further data support our mechanistic are furnished measurements Au disk oriented “face-down” cell as well hydrodynamic experiments.