Journal
JOURNAL OF POWER SOURCES
Volume 441, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227168
Keywords
Li-O-2 batteries; Bifunctional catalytic activity; Free-standing electrode; Flower-like ZnCo2S4; Overpotential
Funding
- National Natural Science Foundation of China [21905033]
- Science and Technology Department of Sichuan Province [2019YJ0503]
- Cultivating Program of Middle Aged Key Teachers of Chengdu University of Technology [KYGG201709]
- Chengdu University of Technology
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The development of high-efficiency oxygen electrode with well structural and chemical stability is critical to boost the rapid development of lithium-oxygen (Li-O-2) batteries. Which are reckoned as a potent contender for next-generation energy storage devices due to their ultra-high theoretical energy density. Here, a flower-like three-dimensional self-standing ZnCo2S4-based electrode without an addition of binders are fabricated and employing as positive electrode for Li-O-2 batteries. The bifunctional catalytic activity of flower-like ZnCo2S4 is conducive to improving the hysteresis kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Representative ultrathin petal edge exposes adequate active sites and provides a sufficient contact interface between Li2O2 and positive electrode, which are essential for reducing the charge overpotential during OER. Compared with the control electrodes, the flower-like ZnCo2S4@Ni-based Li-O-2 battery shows decreased overpotential (0.78 V) and improved cycle stability (over 500 cycles).
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