Journal
CHEMSUSCHEM
Volume 13, Issue 10, Pages 2719-2725Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202000097
Keywords
charge overpotential; Cu2O cathode catalyst; illumination effect; Li-CO2 batteries; shape evolution
Funding
- Ministry of Science and Technology
- MOST [106-2112-M-003-007-MY3, MOST 107-2113-M-002-008-MY3]
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Li-air batteries are limited to lab-scale research owing to the uninterrupted formation of discharge products. In the case of Li-CO2 batteries, the increase in overpotential caused by Li2CO3 formation results in cell death. In this study, Cu2O crystals having three different types of shapes (i.e., cubic, octahedral, and rhombic) were synthesized to compare their catalytic activity toward CO2 reactions. The full-cycle and long-term stability test revealed that rhombohedral Cu2O facilitates Li2CO3 decomposition more efficiently than that of cubic and octahedral Cu2O. The cycle was extended to investigate the photocatalytic activity of the rhombic Cu2O by illuminating the cell. The repeated cycles to 1 h showed a maximum overpotential of 1.5 V, which is 0.5 V lower than that of the cell without illumination. A postmortem analysis of the cell after dividing the cycles into segments demonstrated interesting results concerning the role of light and Cu2O during the cell cycle.
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