A transformation of intermediates of sulfide reduction of gold(III) on the pyrolytic graphite
Александр Сергеевич Романченко, Максим Николаевич Лихацкий, Антон Александрович Карачаров, Юрий Леонидович Михлин
Abstract
Solid products immobilized from colloids containing intermediates of the reduction of tetrachloroaurate-ions by sodium sulfide (at molar ratio [Na2S]/[HAuCl4] of 3:1) on the surface of highly oriented pyrolytic graphite were studied using scanning probe microscopy, cyclic voltammetry and X-ray photoelectron spectroscopy. An evaluation of surface topography and chemical state of both gold and sulfur taking place during colloid’s pre-aging and under electrochemical oxidation in 0.001 M HCl solution were shown.