Review of Anodic Catalysts for SO2 Depolarized Electrolysis for “Green Hydrogen” Production

In the near future, primary energy from fossil fuels should be gradually replaced with renewable and clean energy sources. To succeed in this goal, hydrogen has proven to be a very suitable energy carrier, because it can be easily produced by water electrolysis using renewable energy sources. After...

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Bibliographic Details
Published in:Catalysts 2019-01, Vol.9 (1), p.63
Main Authors: Díaz-Abad, Sergio, Millán, María, Rodrigo, Manuel A., Lobato, Justo
Format: Article
Language:English
Subjects:
Acids
Alternative energy sources
Anode effect
Anodizing
Atmospheric pressure
Carbon
Catalysts
Chemical reactions
Clean energy
Decomposition
Depolarization
Efficiency
Electrodes
Electrolysis
Energy resources
Energy storage
Fossil fuels
Fuel cells
Green hydrogen
Oxidation
Renewable energy sources
Renewable resources
Sulfuric acid
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Summary:In the near future, primary energy from fossil fuels should be gradually replaced with renewable and clean energy sources. To succeed in this goal, hydrogen has proven to be a very suitable energy carrier, because it can be easily produced by water electrolysis using renewable energy sources. After storage, it can be fed to a fuel cell, again producing electricity. There are many ways to improve the efficiency of this process, some of them based on the combination of the electrolytic process with other non-electrochemical processes. One of the most promising is the thermochemical hybrid sulphur cycle (also known as Westinghouse cycle). This cycle combines a thermochemical step (H2SO4 decomposition) with an electrochemical one, where the hydrogen is produced from the oxidation of SO2 and H2O (SO2 depolarization electrolysis, carried out at a considerably lower cell voltage compared to conventional electrolysis). This review summarizes the different catalysts that have been tested for the oxidation of SO2 in the anode of the electrolysis cell. Their advantages and disadvantages, the effect of platinum (Pt) loading, and new tendencies in their use are presented. This is expected to shed light on future development of new catalysts for this interesting process.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal9010063