硫化黑2BR 200%在石墨镀银电极上的电催化还原
摘要
Silver-plated graphite electrodes were prepared by the absorption method and its surface structure was characterized by SEM assembled with energy dispersive spectrometer. The electrochemical behavior of Sulfur Black 2BR 200% on graphite and silver-plated graphite was studied with linear sweep voltammograms. Experimental results showed that metal silver was successfully coated on the surface of graphite and silver-plated graphite electrode gave higher current and showed better catalytic property for the reduction of Sulfur Black 2BR 200% . In addition, the rate of reduction reaction of Sulfur Black increased with increasing pH of electrolyte. The electrolysis experiments were performed by using graphite and silver-plated graphite cathodes respectively. Excellent current efficiency (92.2%) was obtained in the following reaction condition: silver-plated graphite used as cathode, temperature (27±2)℃, current density 6.25 mA•cm^(-2), pH of electrolyte 14.