AUTHOR=Velazquez-Rizo Martin , Cavazos Sepulveda Adrian Cesar 

TITLE=Low-temperature direct electrochemical splitting of H2S

JOURNAL=Frontiers in Chemical Engineering

VOLUME=4

YEAR=2023

URL=https://www.frontiersin.org/journals/chemical-engineering/articles/10.3389/fceng.2022.1087435

DOI=10.3389/fceng.2022.1087435

ISSN=2673-2718

ABSTRACT=<p>Hydrogen is considered one of the most promising decarbonized fuels. However, its applicability is limited due to the ecological constraints of its production. Hydrogen sulfide (H<sub>2</sub>S) is widely available in oil and gas reservoirs and has the potential of becoming an energetically favorable source of hydrogen. Nevertheless, its electrochemical separation into H<sub>2</sub> and elemental sulfur has not been successfully achieved at the industrial scale, due to sulfur poisoning of the electrodes at the sulfur oxidation half-reaction. This review highlights the progress of the direct electrolytic separation of H<sub>2</sub>S below the sulfur dew point, where the sulfur poisoning effect becomes more prominent. The article discusses the different technologies and approaches explored to improve the energy efficiency and stability of H<sub>2</sub>S electrolytic systems, including the recent use of nanostructured electrodes and novel sulfur solvents as electrolytes.</p>