| 초록 |
Effects of catalyst material and loading amount on SO2 oxidation reaction at the anode of electrolytic cell for hybrid sulfur hydrogen generation were investigated in SO2-saturated 50 wt% H2SO4 solution. For this purpose, Pt/C and Pd/C catalysts were used and suspension which is mixture of catalyst, 5 wt% Nafion, ethanol and D.I water was coated on the glassy carbon disk electrode, followed by drying under air atmosphere at 80℃ for 2h. Prior to electrochemical experiments, catalysts were characterized by TEM. The cyclic voltammograms(CVs) were first obtained in deaerated 0.5 M H2SO4 solution to evaluate electrochemical active area for SO2 oxidation reaction. From the analysis of CVs, it was found that electrochemical active area increased as catalyst loading amount increased. In order to determine optimum catalyst loading amount the linear sweep voltammetry was implemented as a function of catalyst loading amount. Finally, the CVs were measured in SO2-free and SO2-saturated 50 wt% H2SO4 solutions to investigate the mechanism of SO2 oxidation reaction. |
