Co3O4 Hollow Nanoparticles and Co Organic Complexes Highly Dispersed on N-Doped Graphene: An Efficient Cathode Catalyst for Li-O-2 Batteries
Co3O4 Hollow Nanoparticles and Co Organic Complexes Highly Dispersed on N-Doped Graphene: An Efficient Cathode Catalyst for Li-O-2 Batteries
复制标题
高度分散在氮掺杂石墨烯上的 Co3O4 空心纳米颗粒和 Co 有机配合物：一种高效的 Li-O-2 电池正极催化剂
DOI：
10.1002/ppsc.201400242
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发表时间：
2015
影响因子：
2.7
通讯作者：
Zhou Zhen
中科院分区：
文献类型：
--
作者：
Zhang Zhang;Chen Yanan;Bao Jie;Xie Zhaojun;Wei Jinping;Zhou Zhen
可充电Li-O2电池由于其高能量密度而成为电动汽车的有前途的候选者。然而，目前Li-O2电池的发展需要高效的空气阴极催化剂，以实现高容量、良好的倍率性能和长循环寿命。本文采用水热-煅烧法制备了Co 3 O 4空心纳米粒子和Co有机配合物高度分散在N掺杂石墨烯（Co-NG）上的复合材料，作为双功能空气阴极催化剂，优化了Li-O2电池的电化学性能。Co-NG在200 mA g−1的电流密度下具有高达19 133 mAh g − 1的出色初始放电容量。此外，电池可以在1000 mAh g− 1的截止容量下持续71次循环，在200 mA g−1的电流密度下具有低过电位。Co-NG复合材料作为可充电Li-O2电池的空气阴极催化剂是有吸引力的。
Rechargeable Li‐O2batteries are promising candidates for electric vehicles due to their high energy density. However, the current development of Li‐O2batteries demands highly efficient air cathode catalysts for high capacity, good rate capability, and long cycle life. In this work, a hydrothermal‐calcination method is presented to prepare a composite of Co3O4hollow nanoparticles and Co organic complexes highly dispersed on N‐doped graphene (Co–NG), which acts as a bifunctional air cathode catalyst to optimize the electrochemical performances of Li‐O2batteries. Co–NG exhibits an outstanding initial discharge capacity up to 19 133 mAh g−1at a current density of 200 mA g−1. In addition, the batteries could sustain 71 cycles at a cutoff capacity of 1000 mAh g−1with low overpotentials at the current density of 200 mA g−1. Co–NG composites are attractive as air cathode catalysts for rechargeable Li‐O2batteries.