Electrochemical Production of Hydrogen from Hydrogen Sulfide Using Cobalt Cadmium Sulfide.

Abstract

The electrocatalytic decomposition of H2S is a promising technology for H2 production as well as for targeting environmental pollution. But due to the lack of low-cost and efficient electrocatalysts, this technology for H2 production is not being explored much. Moreover, the highly toxic and copious waste H2S released from industries is rarely encountered in the scientific domain. Herein, we have designed a highly efficient electrocatalyst, i.e., CoCd(x:y)Sn, as an anode catalyst for sulfide oxidation reaction (SOR). This optimized catalyst could drive the anode reaction at an onset potential of 0.25 V vs reversible hydrogen electrode (RHE), which was 1.27 V lower than that required for the water oxidation reaction. Moreover, we have achieved 98% H2 Faradaic efficiency with remarkable stability of 120 h. Thus, this method paves a path to high-value utilization of hazardous waste H2S and demonstrates its great potential for hydrogen production and sulfur toward sustainable energy applications.