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)­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% 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.

Improved catalytic activity on transitioning from inverse to normal spinel in Zn2−xGa2xSn1−xO4: a robust bifunctional OER and HER electrocatalyst

“…The OER being a multi-electron transfer reaction has sluggish kinetics, which is the bottleneck of the electrocatalytic water splitting process. 10,11 The state-of-the-art catalysts for the HER and OER are Pt/C and RuO 2 /IrO 2 respectively. 7,12 Pt based electrocatalysts have been used for the HER which showed poor activity towards the OER whereas oxide based electrocatalysts (RuO 2 , IrO 2 ) have been used for the OER, which are not suitable for the HER.…”

Enhanced electrocatalytic performance of bismuth-doped zinc stannate towards OER and HER through oxygen vacancies: p-block metal ion doping empowering d-block

“…To address the future energy demand, electrochemical water splitting is an efficient and an effective method for the production of hydrogen, which is considered as the most efficient energy carrier and fuel. 1–5 The overall water-splitting reaction is a combination of two half–cell reactions occurring at the anode and the cathode, namely hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). 6–8 HER involves the reduction of protons to form hydrogen gas at the cathode, whereas OER involves the oxidation of water molecules to produce oxygen and protons with the release of electrons at the anode.…”

NiFeOOH-Co9S8-Intercalated Nanostructure Arrays for Energy-Efficient H2 Production and Sulfion Oxidation at High Current Density

“…Recently, several reports have emerged describing the successful development of nanocatalyst systems capable of splitting H 2 S at low potential value. 18,19 For example, a CoNi nanoalloy embedded in N-doped graphene exhibited a low overpotential value of 0.25 V and extended durability up to 1200 h toward H 2 S splitting activity. 20 Bifunctional Co 3 S 4 nanowires enabled H 2 production at a highly efficient overall potential of 0.47 V with the corresponding j value of 100 mA/ cm 2 .…”

“…Therefore, electrochemical splitting of H 2 S is advantageous from the perspective of energy efficiency, since the thermodynamic potential for the sulfion oxidation reaction (SOR) is −0.48 V at SHE, which is much lower compared to that of the oxygen evolution reaction (OER) (1.23 V at RHE). , Furthermore, the availability of active and sustainable catalyst systems capable of producing a high SOR j value at low potential raises the possibility of utilizing H 2 S as a H 2 source in the future. Recently, several reports have emerged describing the successful development of nanocatalyst systems capable of splitting H 2 S at low potential value. , For example, a CoNi nanoalloy embedded in N-doped graphene exhibited a low overpotential value of 0.25 V and extended durability up to 1200 h toward H 2 S splitting activity . Bifunctional Co 3 S 4 nanowires enabled H 2 production at a highly efficient overall potential of 0.47 V with the corresponding j value of 100 mA/cm 2 .…”