Importance of Ambient O2 for Electrochemical Enrichment of Atmospheric CO2
| Autor: | Hong Liu, Chuan Wang, Linze Zheng, Xiang-zhong Li |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Industrial & Engineering Chemistry Research. 52:2470-2476 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie302991y |
| Popis: | Enrichment is a prerequisite for CO2 reduction from air and demands mild conditions for energy saving. Electrochemically generated OH– and H+ can be employed for atmosphere CO2 enrichment (capture and recovery) under ambient condition. This study demonstrated the importance of the coexisting ambient O2 in the electrochemical OH–/H+ generation. Our system showed that CO2 in air could be captured simultaneously with the OH–/H+ generation. Meanwhile, O2 in air served to start up such generation from a cell voltage of 1.3 V, significantly lower than 2.2 V without O2. Simple modeling and experiments of OH–/H+ generation evidenced that ambient O2 elevated the effectiveness of OH–/H+ generation by lifting the energy efficiency in a galvanostatic mode, and accelerating the generation rate in a potentiostatic mode. Meanwhile, the effectiveness elevation was attributed to an improvement of the intrinsic properties of electrode reactions for OH–/H+ generation. Rather, beyond the cell voltage of 4.9 V, no difference ... |
| Databáze: | OpenAIRE |
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