In-Situ Growth of CeO₂ Nanoparticles on N-doped Reduced Graphene Oxide for Anchoring Li₂O₂ Formation in Lithium-Oxygen Batteries

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• 作者：Yuexing Jiang ; Junfang Cheng ; Lu Zou ; Xinyu Li ; Yingpeng Gong ; Bo Chi ; ^{chibo@hust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jian Pu ; Jian Li
• 关键词：Lithium-oxygen batteries ; Oxygen reduction reaction ; Ceria ; Lithium peroxide anchoring
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 August 2016
• 年：2016
• 卷：210
• 期：Complete
• 页码：712-719
• 全文大小：3573 K

文摘

The large overpotentials during oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are still big challenges for the non-aqueous lithium-oxygen batteries. In this paper, CeO₂ nanoparticles on N-doped reduced graphene oxide (CeO₂@N-RGO) are in-situ synthesized through a one-step hydrothermal process as binder-free cathode catalyst. The battery with CeO₂@N-RGO cathode delivers a capacity of 11,900 mAh g⁻¹ at current density of 400 mA g⁻¹, and can cycle up to 40 times without obvious degradation at the capacity limitation of 1000 mAh g⁻¹. The performance enhancement of the battery can be attributed to the synergetic effect of N-RGO and CeO₂ nanoparyicles anchoring the formation of Li₂O₂. The study confirms that CeO₂@N-RGO can be a potential excellent cathode catalyst for ORR and OER for rechargeable lithium-oxygen batteries.