Curtailing the Overpotential of Li-CO2 Batteries with Shape-Controlled Cu2 O as Cathode: Effect of Illuminating the Cathode

ChemSusChem
Anirudha JenaRu Shi Liu

Abstract

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 Li2 CO3 formation results in cell death. In this study, Cu2 O 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 Cu2 O facilitates Li2 CO3 decomposition more efficiently than that of cubic and octahedral Cu2 O. The cycle was extended to investigate the photocatalytic activity of the rhombic Cu2 O 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 Cu2 O during the cell cycle.

References

Feb 10, 2011·Chemical Communications : Chem Comm·Kensuke TakechiTakahiko Asaoka
May 10, 2011·Nature Materials·Adriana ParacchinoElijah Thimsen
Jan 20, 2012·Journal of the American Chemical Society·Wan-Chen HuangMichael H Huang
May 15, 2015·Angewandte Chemie·Zhang ZhangZhen Zhou
Aug 21, 2015·Chemical Communications : Chem Comm·Xin ZhangZhen Zhou
Feb 22, 2017·ChemSusChem·Arjan W KleijAtsushi Urakawa
Jan 10, 2018·ChemSusChem·Li ZhangHuan Pang
Oct 10, 2018·ACS Applied Materials & Interfaces·Robert PipesArumugam Manthiram
Jan 15, 2019·ACS Applied Materials & Interfaces·Shiyu BieZhigang Zou

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