Electrochemical Production of Hydrogen from Hydrogen Sulfide Using Cobalt Cadmium Sulfide
Kalpana Garg, Mukesh Kumar, Sukhjot Kaur, Tharamani C. Nagaiah
Abstract
The electrocatalytic decomposition of H 2 S is a promising technology for H 2 production as well as for targeting environmental pollution. But due to the lack of low-cost and efficient electrocatalysts, this technology for H 2 production is not being explored much. Moreover, the highly toxic and copious waste H 2 S released from industries is rarely encountered in the scientific domain. Herein, we have designed a highly efficient electrocatalyst, i.e., CoCd( x:y )S n, 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% H 2 Faradaic efficiency with remarkable stability of 120 h. Thus, this method paves a path to high-value utilization of hazardous waste H 2 S and demonstrates its great potential for hydrogen production and sulfur toward sustainable energy applications.