Stable Tetrasubstituted Quinone Redox Reservoir for Enhancing Decoupled Hydrogen and Oxygen Evolution
| Autor: | Song Jin, Hongyuan Sheng, James B. Gerken, Wenjie Li, Fei Wang, Shannon S. Stahl |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Hydroquinone
Electrolysis of water Renewable Energy Sustainability and the Environment Electrolytic cell Oxygen evolution Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Decomposition Flow battery Redox Article 0104 chemical sciences Quinone chemistry.chemical_compound Fuel Technology chemistry Chemistry (miscellaneous) Materials Chemistry 0210 nano-technology |
| Zdroj: | ACS Energy Lett |
| ISSN: | 2380-8195 |
| DOI: | 10.1021/acsenergylett.1c00236 |
| Popis: | Redox reservoirs (RRs) may be used to decouple the two half-reactions of water electrolysis, enabling spatial and temporal separation of hydrogen and oxygen evolution. Organic RRs are appealing candidates for this application; however, their instability limits their utility. Here, we show that a tetrathioether-substituted quinone, tetramercaptopropanesulfonate quinone (TMQ), exhibits significantly enhanced stability relative to anthraquinone-2,7-disulfonate (AQDS), the most effective organic RR reported previously. The enhanced stability, confirmed by symmetric flow battery experiments under relevant conditions, enables stable electrochemical production of H(2) and O(2) in a continuous flow electrolysis cell. The reduced RR, tetramercaptopropanesulfonate hydroquinone (TMHQ), is not susceptible to decomposition, while the oxidized state, TMQ, undergoes slow decomposition, evident only after sustained operation (>60 h). Analysis of the byproducts provides that basis for a decomposition mechanism, establishing a foundation for the design of new organic RRs with even better performance. |
| Databáze: | OpenAIRE |
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