Performance of Sulfide-Driven Fuel Cell Aerated by Venturi Tube Ejector
| Autor: | Stefan M. Stefanov, Elena Razkazova-Velkova, Martin Martinov, Venko Beschkov |
|---|---|
| Přispěvatelé: | Stefan Stefanov |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Sulfide sulfide redox processes Hydrogen sulfide TP1-1185 02 engineering and technology Electrochemistry 01 natural sciences Catalysis law.invention fuel cell chemistry.chemical_compound law Graphite Physical and Theoretical Chemistry QD1-999 aeration Polysulfide chemistry.chemical_classification Gas diffusion electrode 010405 organic chemistry Chemical technology Injector 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry chemistry Chemical engineering Venturi effect Venturi tube 0210 nano-technology |
| Zdroj: | Catalysts, Vol 11, Iss 694, p 694 (2021) Catalysts Volume 11 Issue 6 |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal11060694 |
| Popis: | Hydrogen sulfide is frequently met in natural waters, like mineral springs, but mostly it is found in marine water with low renewal rate. The Black Sea has extremely high hydrogen sulfide content. It can be utilized in different ways, but the most promising one is direct conversion into electricity. This result can be attained by a sulfide-driven fuel cell (SDFC), converting sulfide to sulfate thus releasing electric energy up to 24 GJ/t. One of the most important problems is the mass transfer limitation on oxygen transfer in the cathode space of the fuel cell. This problem can be solved using a gas diffusion electrode or highly efficient saturation by oxygen in an ejector of the Venturi tube type. This work presents experimental data in laboratory-scale SDFC for sulfide conversion into sulfate, sulfite and polysulfide releasing different amounts of electric energy. Two types of aeration are tested: direct air blow and Venturi-tube ejector. Besides pure graphite, two catalysts, i.e., cobalt spinel and zirconia-doped graphite were tested as anodes. Experiments were carried out at initial sulfide concentrations from 50 to 300 mg/L. Sulfate, sulfite and thiosulfate ions were detected in the outlet solutions from the fuel cell. The electrochemical results show good agreement with the chemical analyses. Most of the results show attained high efficiencies of the fuel cell, i.e., up to 80%. The practical applications of this method can be extended for other purposes, like treatment of polluted water together with utilization as energy. |
| Databáze: | OpenAIRE |
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