Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61989
Title: Cobalt-copper layered double hydroxide nanosheets as high performance bifunctional catalysts for rechargeable lithium-air batteries
Authors: Liu, Y
Liu, Y
Shi, H
Wang, M
Cheng, SHS
Bian, H
Kamruzzaman, M
Cao, L
Chung, CY
Lu, Z
Keywords: Catalysts
Cobalt-copper layered double hydroxide
Lithium-air batteries
Nanosheets
Oxygen evolution reaction
Issue Date: 2016
Publisher: Elsevier
Source: Journal of alloys and compounds, 2016, v. 688, p. 380-387 How to cite?
Journal: Journal of alloys and compounds 
Abstract: Designing novel cost-effective catalysts is one of the greatest challenges in the development of high-performance rechargeable Li-air battery. Here, we report the synthesis of novel cobalt-copper layered double hydroxide (LDH) nanosheets via a simple co-precipitation method under Ar gas. The resulting Co-Cu LDH nanosheets, possessing an average thickness of 4.3 nm and a high surface area of 163 m2 g−1, have been applied as bifunctional catalysts for Li-air battery. In the simulated air environment, Li-air batteries with Co-Cu LDH nanosheets demonstrate higher discharge capacity of 4870 mAh g−1 at 200 mA g−1, lower charge overpotential and better cycling stability with controlling capacity of 1000 mAh g−1, which is much better than that with CuCo2O4 electrode. The enhanced electrochemical performance is ascribed to the large interface between electrolytes and catalysts resulting from high surface area of Co-Cu LDH, providing plenty of actives sites to promote the formation/decomposition of Li2O2. The unique ultrathin nanosheet structure of Co-Cu LDH can also facilitate the mass transportation of O2 and ions in Li-air battery.
URI: http://hdl.handle.net/10397/61989
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2016.07.224
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