Influence of Cu²⁺ doping concentration on the catalytic activity of CuₓCo₃₋ₓO₄ for rechargeable Li–O₂ batteries
2017
He, Lewei | Wang, Youwei | Wang, Fan | Zhang, Sanpei | Wu, Xiangwei | Wen, Z. (Zhaoyin) | Liu, Jianjun | Zhang, Wenqing
The electrochemical performance of rechargeable lithium–oxygen (Li–O₂) batteries relies on the catalysts used in the cathode to a great extent. Herein, a series of CuₓCo₃₋ₓO₄ nanorods with different Cu²⁺ concentrations was prepared by a convenient hydrothermal method. The corresponding structures and electrochemistries were further characterized in order to reveal the composition effect of catalyst on catalytic activity. Experimental characterization and theoretical calculations indicate that more Cu²⁺ occupying Co²⁺ positions and dispersing on the catalyst surface has an enhanced catalytic activity in terms of higher capacity, lower overpotential and better reversibility. This implies that suitable charge transfer from Li₂O₂ to the catalyst plays an important role in improving the electrochemical performance of Li–O₂ batteries. The present study is helpful for designing a highly active catalyst by tuning the composition of the catalyst surface.
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